Author: buildbot Date: Tue May 15 07:21:12 2018 New Revision: 1029901 Log: Production update by buildbot for camel
Modified: websites/production/camel/content/bean-binding.html websites/production/camel/content/bean.html websites/production/camel/content/book-component-appendix.html websites/production/camel/content/book-cookbook.html websites/production/camel/content/book-in-one-page.html websites/production/camel/content/cache/main.pageCache websites/production/camel/content/spring-remoting.html Modified: websites/production/camel/content/bean-binding.html ============================================================================== --- websites/production/camel/content/bean-binding.html (original) +++ websites/production/camel/content/bean-binding.html Tue May 15 07:21:12 2018 @@ -36,6 +36,15 @@ <![endif]--> + <link href='//camel.apache.org/styles/highlighter/styles/shCoreCamel.css' rel='stylesheet' type='text/css' /> + <link href='//camel.apache.org/styles/highlighter/styles/shThemeCamel.css' rel='stylesheet' type='text/css' /> + <script src='//camel.apache.org/styles/highlighter/scripts/shCore.js' type='text/javascript'></script> + <script src='//camel.apache.org/styles/highlighter/scripts/shBrushJava.js' type='text/javascript'></script> + + <script type="text/javascript"> + SyntaxHighlighter.defaults['toolbar'] = false; + SyntaxHighlighter.all(); + </script> <title> Apache Camel: Bean Binding @@ -78,47 +87,81 @@ <tbody> <tr> <td valign="top" width="100%"> -<div class="wiki-content maincontent"><h2 id="BeanBinding-BeanBinding">Bean Binding</h2><p>Bean Binding in Camel defines both which methods are invoked and also how the <a shape="rect" href="message.html">Message</a> is converted into the parameters of the method when it is invoked.</p><h3 id="BeanBinding-Choosingthemethodtoinvoke">Choosing the method to invoke</h3><p>The binding of a Camel <a shape="rect" href="message.html">Message</a> to a bean method call can occur in different ways, in the following order of importance:</p><ul><li>if the message contains the header <strong>CamelBeanMethodName</strong> then that method is invoked, converting the body to the type of the method's argument.<ul><li>From <strong>Camel 2.8</strong> onwards you can qualify parameter types to select exactly which method to use among overloads with the same name (see below for more details).</li><li>From <strong>Camel 2.9</strong> onwards you can specify parameter values directly in the method option (se e below for more details).</li></ul></li><li>you can explicitly specify the method name in the <a shape="rect" href="dsl.html">DSL</a> or when using <a shape="rect" href="pojo-consuming.html">POJO Consuming</a> or <a shape="rect" href="pojo-producing.html">POJO Producing</a></li><li>if the bean has a method marked with the <code>@Handler</code> annotation, then that method is selected</li><li>if the bean can be converted to a <a shape="rect" href="processor.html">Processor</a> using the <a shape="rect" href="type-converter.html">Type Converter</a> mechanism, then this is used to process the message. The <a shape="rect" href="activemq.html">ActiveMQ</a> component uses this mechanism to allow any JMS MessageListener to be invoked directly by Camel without having to write any integration glue code. You can use the same mechanism to integrate Camel into any other messaging/remoting frameworks.</li><li>if the body of the message can be converted to a <a shape="rect" class="external-link" href="http://camel.apache.org/maven/current/camel-core/apidocs/org/apache/camel/component/bean/BeanInvocation.html">BeanInvocation</a> (the default payload used by the <a shape="rect" class="external-link" href="http://camel.apache.org/maven/current/camel-core/apidocs/org/apache/camel/component/bean/ProxyHelper.html">ProxyHelper</a>) component - then that is used to invoke the method and pass its arguments</li><li>otherwise the type of the body is used to find a matching method; an error is thrown if a single method cannot be chosen unambiguously.</li><li>you can also use Exchange as the parameter itself, but then the return type must be void.</li><li>if the bean class is private (or package-private), interface methods will be preferred (from <strong>Camel 2.9</strong> onwards) since Camel can't invoke class methods on such beans</li></ul><p>In cases where Camel cannot choose a method to invoke, an <code>AmbiguousMethodCallException</code> is thrown.</p><p>By default the return val ue is set on the outbound message body. </p><h3 id="BeanBinding-Asynchronousprocessing">Asynchronous processing</h3><p>From <strong>Camel 2.18</strong> onwards you can return a CompletionStage implementation (e.g. a CompletableFuture) to implement asynchronous processing.</p><p>Please be sure to properly complete the CompletionStage with the result or exception, including any timeout handling. Exchange processing would wait for completion and would not impose any timeouts automatically. It's extremely useful to monitor <a shape="rect" class="external-link" href="https://camel.apache.org/maven/current/camel-core/apidocs/org/apache/camel/spi/InflightRepository.html">Inflight repository</a> for any hanging messages.</p><p>Note that completing with "null" won't set outbody message body to null, but would keep message intact. This is useful to support methods that don't modify exchange and return CompletableFuture<Void>. To set body to null, just add Exchange me thod parameter and directly modify exchange messages.</p><p>Examples:</p><p>Simple asynchronous processor, modifying message body.</p><parameter ac:name="language">java</parameter><plain-text-body>public CompletableFuture<String> doSomethingAsync(String body)</plain-text-body><p>Composite processor that do not modify exchange</p><parameter ac:name="language">java</parameter><plain-text-body>public CompletableFuture<Void> doSomethingAsync(String body) { - return CompletableFuture.allOf(doA(body), doB(body), doC()); -}</plain-text-body><h3 id="BeanBinding-Parameterbinding">Parameter binding</h3><p>When a method has been chosen for invocation, Camel will bind to the parameters of the method.</p><p>The following Camel-specific types are automatically bound:</p><ul class="alternate"><li><code>org.apache.camel.Exchange</code></li><li><code>org.apache.camel.Message</code></li><li><code>org.apache.camel.CamelContext</code></li><li><code>org.apache.camel.TypeConverter</code></li><li><code>org.apache.camel.spi.Registry</code></li><li><code>java.lang.Exception</code></li></ul><p>So, if you declare any of these types, they will be provided by Camel. <strong>Note that <code>Exception</code> will bind to the caught exception of the <a shape="rect" href="exchange.html">Exchange</a></strong> - so it's often usable if you employ a <a shape="rect" href="pojo.html">Pojo</a> to handle, e.g., an <code>onException</code> route.</p><p>What is most interesting is that Camel will also try to bind the body of the <a sh ape="rect" href="exchange.html">Exchange</a> to the first parameter of the method signature (albeit not of any of the types above). So if, for instance, we declare a parameter as <code>String body</code>, then Camel will bind the IN body to this type. Camel will also automatically convert to the type declared in the method signature.</p><p>Let's review some examples:</p><p>Below is a simple method with a body binding. Camel will bind the IN body to the <code>body</code> parameter and convert it to a <code>String</code>.</p><plain-text-body>public String doSomething(String body) -</plain-text-body><p>In the following sample we got one of the automatically-bound types as well - for instance, a <code>Registry</code> that we can use to lookup beans.</p><plain-text-body>public String doSomething(String body, Registry registry) -</plain-text-body><p>We can use <a shape="rect" href="exchange.html">Exchange</a> as well:</p><plain-text-body>public String doSomething(String body, Exchange exchange) -</plain-text-body><p>You can also have multiple types:</p><plain-text-body>public String doSomething(String body, Exchange exchange, TypeConverter converter) -</plain-text-body><p>And imagine you use a <a shape="rect" href="pojo.html">Pojo</a> to handle a given custom exception <code>InvalidOrderException</code> - we can then bind that as well:</p><plain-text-body>public String badOrder(String body, InvalidOrderException invalid) -</plain-text-body><p>Notice that we can bind to it even if we use a sub type of <code>java.lang.Exception</code> as Camel still knows it's an exception and can bind the cause (if any exists).</p><p>So what about headers and other stuff? Well now it gets a bit tricky - so we can use annotations to help us, or specify the binding in the method name option.<br clear="none"> See the following sections for more detail.</p><h3 id="BeanBinding-BindingAnnotations">Binding Annotations</h3><p>You can use the <a shape="rect" href="parameter-binding-annotations.html">Parameter Binding Annotations</a> to customize how parameter values are created from the <a shape="rect" href="message.html">Message</a></p><h4 id="BeanBinding-Examples">Examples</h4><p>For example, a <a shape="rect" href="bean.html">Bean</a> such as:</p><plain-text-body>public class Bar { - +<div class="wiki-content maincontent"><h2 id="BeanBinding-BeanBinding">Bean Binding</h2><p>Bean Binding in Camel defines both which methods are invoked and also how the <a shape="rect" href="message.html">Message</a> is converted into the parameters of the method when it is invoked.</p><h3 id="BeanBinding-Choosingthemethodtoinvoke">Choosing the method to invoke</h3><p>The binding of a Camel <a shape="rect" href="message.html">Message</a> to a bean method call can occur in different ways, in the following order of importance:</p><ul><li>if the message contains the header <strong>CamelBeanMethodName</strong> then that method is invoked, converting the body to the type of the method's argument.<ul><li>From <strong>Camel 2.8</strong> onwards you can qualify parameter types to select exactly which method to use among overloads with the same name (see below for more details).</li><li>From <strong>Camel 2.9</strong> onwards you can specify parameter values directly in the method option (se e below for more details).</li></ul></li><li>you can explicitly specify the method name in the <a shape="rect" href="dsl.html">DSL</a> or when using <a shape="rect" href="pojo-consuming.html">POJO Consuming</a> or <a shape="rect" href="pojo-producing.html">POJO Producing</a></li><li>if the bean has a method marked with the <code>@Handler</code> annotation, then that method is selected</li><li>if the bean can be converted to a <a shape="rect" href="processor.html">Processor</a> using the <a shape="rect" href="type-converter.html">Type Converter</a> mechanism, then this is used to process the message. The <a shape="rect" href="activemq.html">ActiveMQ</a> component uses this mechanism to allow any JMS MessageListener to be invoked directly by Camel without having to write any integration glue code. You can use the same mechanism to integrate Camel into any other messaging/remoting frameworks.</li><li>if the body of the message can be converted to a <a shape="rect" class="external-link" href="http://camel.apache.org/maven/current/camel-core/apidocs/org/apache/camel/component/bean/BeanInvocation.html">BeanInvocation</a> (the default payload used by the <a shape="rect" class="external-link" href="http://camel.apache.org/maven/current/camel-core/apidocs/org/apache/camel/component/bean/ProxyHelper.html">ProxyHelper</a>) component - then that is used to invoke the method and pass its arguments</li><li>otherwise the type of the body is used to find a matching method; an error is thrown if a single method cannot be chosen unambiguously.</li><li>you can also use Exchange as the parameter itself, but then the return type must be void.</li><li>if the bean class is private (or package-private), interface methods will be preferred (from <strong>Camel 2.9</strong> onwards) since Camel can't invoke class methods on such beans</li></ul><p>In cases where Camel cannot choose a method to invoke, an <code>AmbiguousMethodCallException</code> is thrown.</p><p>By default the return val ue is set on the outbound message body. </p><h3 id="BeanBinding-Asynchronousprocessing">Asynchronous processing</h3><p>From <strong>Camel 2.18</strong> onwards you can return a CompletionStage implementation (e.g. a CompletableFuture) to implement asynchronous processing.</p><p>Please be sure to properly complete the CompletionStage with the result or exception, including any timeout handling. Exchange processing would wait for completion and would not impose any timeouts automatically. It's extremely useful to monitor <a shape="rect" class="external-link" href="https://camel.apache.org/maven/current/camel-core/apidocs/org/apache/camel/spi/InflightRepository.html">Inflight repository</a> for any hanging messages.</p><p>Note that completing with "null" won't set outbody message body to null, but would keep message intact. This is useful to support methods that don't modify exchange and return CompletableFuture<Void>. To set body to null, just add Exchange me thod parameter and directly modify exchange messages.</p><p>Examples:</p><p>Simple asynchronous processor, modifying message body.</p><div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl"> +<script class="brush: java; gutter: false; theme: Default" type="syntaxhighlighter"><![CDATA[public CompletableFuture<String> doSomethingAsync(String body)]]></script> +</div></div><p><br clear="none">Composite processor that do not modify exchange</p><div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl"> +<script class="brush: java; gutter: false; theme: Default" type="syntaxhighlighter"><![CDATA[Â public CompletableFuture<Void> doSomethingAsync(String body) { + return CompletableFuture.allOf(doA(body), doB(body), doC()); + }]]></script> +</div></div><h3 id="BeanBinding-Parameterbinding"><br clear="none">Parameter binding</h3><p>When a method has been chosen for invocation, Camel will bind to the parameters of the method.</p><p>The following Camel-specific types are automatically bound:</p><ul class="alternate"><li><code>org.apache.camel.Exchange</code></li><li><code>org.apache.camel.Message</code></li><li><code>org.apache.camel.CamelContext</code></li><li><code>org.apache.camel.TypeConverter</code></li><li><code>org.apache.camel.spi.Registry</code></li><li><code>java.lang.Exception</code></li></ul><p>So, if you declare any of these types, they will be provided by Camel. <strong>Note that <code>Exception</code> will bind to the caught exception of the <a shape="rect" href="exchange.html">Exchange</a></strong> - so it's often usable if you employ a <a shape="rect" href="pojo.html">Pojo</a> to handle, e.g., an <code>onException</code> route.</p><p>What is most interesting is that Camel will also try to bind the body of the <a shape="rect" href="exchange.html">Exchange</a> to the first parameter of the method signature (albeit not of any of the types above). So if, for instance, we declare a parameter as <code>String body</code>, then Camel will bind the IN body to this type. Camel will also automatically convert to the type declared in the method signature.</p><p>Let's review some examples:</p><p>Below is a simple method with a body binding. Camel will bind the IN body to the <code>body</code> parameter and convert it to a <code>String</code>.</p><div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl"> +<script class="brush: java; gutter: false; theme: Default" type="syntaxhighlighter"><![CDATA[public String doSomething(String body)]]></script> +</div></div><p>In the following sample we got one of the automatically-bound types as well - for instance, a <code>Registry</code> that we can use to lookup beans.</p><div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl"> +<script class="brush: java; gutter: false; theme: Default" type="syntaxhighlighter"><![CDATA[public String doSomething(String body, Registry registry)Â ]]></script> +</div></div><p><br clear="none">We can use <a shape="rect" href="exchange.html">Exchange</a> as well:</p><div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl"> +<script class="brush: java; gutter: false; theme: Default" type="syntaxhighlighter"><![CDATA[public String doSomething(String body, Exchange exchange)Â ]]></script> +</div></div><p><br clear="none">You can also have multiple types:</p><div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl"> +<script class="brush: java; gutter: false; theme: Default" type="syntaxhighlighter"><![CDATA[public String doSomething(String body, Exchange exchange, TypeConverter converter)Â ]]></script> +</div></div><p><br clear="none">And imagine you use a <a shape="rect" href="pojo.html">Pojo</a> to handle a given custom exception <code>InvalidOrderException</code> - we can then bind that as well:</p><div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl"> +<script class="brush: java; gutter: false; theme: Default" type="syntaxhighlighter"><![CDATA[public String badOrder(String body, InvalidOrderException invalid)Â ]]></script> +</div></div><p><br clear="none">Notice that we can bind to it even if we use a sub type of <code>java.lang.Exception</code> as Camel still knows it's an exception and can bind the cause (if any exists).</p><p>So what about headers and other stuff? Well now it gets a bit tricky - so we can use annotations to help us, or specify the binding in the method name option.<br clear="none"> See the following sections for more detail.</p><h3 id="BeanBinding-BindingAnnotations">Binding Annotations</h3><p>You can use the <a shape="rect" href="parameter-binding-annotations.html">Parameter Binding Annotations</a> to customize how parameter values are created from the <a shape="rect" href="message.html">Message</a></p><h4 id="BeanBinding-Examples">Examples</h4><p>For example, a <a shape="rect" href="bean.html">Bean</a> such as:</p><div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl"> +<script class="brush: java; gutter: false; theme: Default" type="syntaxhighlighter"><![CDATA[public class Bar { public String doSomething(String body) { - // process the in body and return whatever you want - return "Bye World"; - } -</plain-text-body><p>Or the Exchange example. Notice that the return type must be <strong>void</strong> when there is only a single parameter of the type <code>org.apache.camel.Exchange</code>:</p><plain-text-body>public class Bar { - - public void doSomething(Exchange exchange) { - // process the exchange - exchange.getIn().setBody("Bye World"); - } -</plain-text-body><h4 id="BeanBinding-@Handler">@Handler</h4><p>You can mark a method in your bean with the @Handler annotation to indicate that this method should be used for <a shape="rect" href="bean-binding.html">Bean Binding</a>.<br clear="none"> This has an advantage as you need not specify a method name in the Camel route, and therefore do not run into problems after renaming the method in an IDE that can't find all its references.</p><parameter ac:name="">java</parameter><plain-text-body>public class Bar { - - @Handler + // process the in body and return whatever you want + return "Bye World"; +}Â ]]></script> +</div></div><p>Or the Exchange example. Notice that the return type must be <strong>void</strong> when there is only a single parameter of the type <code>org.apache.camel.Exchange</code>:</p><div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl"> +<script class="brush: java; gutter: false; theme: Default" type="syntaxhighlighter"><![CDATA[Â public class Bar { + public void doSomething(Exchange exchange) { + // process the exchange + exchange.getIn().setBody("Bye World"); + }]]></script> +</div></div><h4 id="BeanBinding-@Handler"><br clear="none">@Handler</h4><p>You can mark a method in your bean with the @Handler annotation to indicate that this method should be used for <a shape="rect" href="bean-binding.html">Bean Binding</a>.<br clear="none"> This has an advantage as you need not specify a method name in the Camel route, and therefore do not run into problems after renaming the method in an IDE that can't find all its references.</p><div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl"> +<script class="brush: java; gutter: false; theme: Default" type="syntaxhighlighter"><![CDATA[public class Bar { + @Handler public String doSomething(String body) { - // process the in body and return whatever you want - return "Bye World"; - } -</plain-text-body><h3 id="BeanBinding-Parameterbindingusingmethodoption">Parameter binding using method option</h3><p><strong>Available as of Camel 2.9</strong></p><p>Camel uses the following rules to determine if it's a parameter value in the method option</p><ul class="alternate"><li>The value is either <code>true</code> or <code>false</code> which denotes a boolean value</li><li>The value is a numeric value such as <code>123</code> or <code>7</code></li><li>The value is a String enclosed with either single or double quotes</li><li>The value is null which denotes a <code>null</code> value</li><li>It can be evaluated using the <a shape="rect" href="simple.html">Simple</a> language, which means you can use, e.g., body, header.foo and other <a shape="rect" href="simple.html">Simple</a> tokens. Notice the tokens must be enclosed with ${ }.</li></ul><p>Any other value is consider to be a type declaration instead - see the next section about specifying types for overloaded methods.</p>< p>When invoking a <a shape="rect" href="bean.html">Bean</a> you can instruct Camel to invoke a specific method by providing the method name:</p><plain-text-body> .bean(OrderService.class, "doSomething") -</plain-text-body><p>Here we tell Camel to invoke the doSomething method - Camel handles the parameters' binding. Now suppose the method has 2 parameters, and the 2nd parameter is a boolean where we want to pass in a true value:</p><plain-text-body>public void doSomething(String payload, boolean highPriority) { - ... -} -</plain-text-body><p>This is now possible in <strong>Camel 2.9</strong> onwards:</p><plain-text-body> .bean(OrderService.class, "doSomething(*, true)") -</plain-text-body><p>In the example above, we defined the first parameter using the wild card symbol *, which tells Camel to bind this parameter to any type, and let Camel figure this out. The 2nd parameter has a fixed value of <code>true</code>. Instead of the wildcard symbol we can instruct Camel to use the message body as shown:</p><plain-text-body> .bean(OrderService.class, "doSomething(${body}, true)") -</plain-text-body><p>The syntax of the parameters is using the <a shape="rect" href="simple.html">Simple</a> expression language so we have to use ${ } placeholders in the body to refer to the message body.</p><p>If you want to pass in a <code>null</code> value, then you can explicit define this in the method option as shown below:</p><plain-text-body> .to("bean:orderService?method=doSomething(null, true)") -</plain-text-body><p>Specifying <code>null</code> as a parameter value instructs Camel to force passing a <code>null</code> value.</p><p>Besides the message body, you can pass in the message headers as a <code>java.util.Map</code>:</p><plain-text-body> .bean(OrderService.class, "doSomethingWithHeaders(${body}, ${headers})") -</plain-text-body><p>You can also pass in other fixed values besides booleans. For example, you can pass in a String and an integer:</p><plain-text-body> .bean(MyBean.class, "echo('World', 5)") -</plain-text-body><p>In the example above, we invoke the echo method with two parameters. The first has the content 'World' (without quotes), and the 2nd has the value of 5.<br clear="none"> Camel will automatically convert these values to the parameters' types.</p><p>Having the power of the <a shape="rect" href="simple.html">Simple</a> language allows us to bind to message headers and other values such as:</p><plain-text-body> .bean(OrderService.class, "doSomething(${body}, ${header.high})") -</plain-text-body><p>You can also use the OGNL support of the <a shape="rect" href="simple.html">Simple</a> expression language. Now suppose the message body is an object which has a method named <code>asXml</code>. To invoke the <code>asXml</code> method we can do as follows:</p><plain-text-body> .bean(OrderService.class, "doSomething(${body.asXml}, ${header.high})") -</plain-text-body><p>Instead of using <code>.bean</code> as shown in the examples above, you may want to use <code>.to</code> instead as shown:</p><plain-text-body> .to("bean:orderService?method=doSomething(${body.asXml}, ${header.high})") -</plain-text-body><h3 id="BeanBinding-Usingtypequalifierstoselectamongoverloadedmethods">Using type qualifiers to select among overloaded methods</h3><p><strong>Available as of Camel 2.8</strong></p><p>If you have a <a shape="rect" href="bean.html">Bean</a> with overloaded methods, you can now specify parameter types in the method name so Camel can match the method you intend to use.<br clear="none"> Given the following bean:<plain-text-body>{snippet:id=e1|lang=java|title=MyBean|url=camel/trunk/camel-core/src/test/java/org/apache/camel/component/bean/BeanOverloadedMethodTest.java}</plain-text-body>Then the <code>MyBean</code> has 2 overloaded methods with the names <code>hello</code> and <code>times</code>. So if we want to use the method which has 2 parameters we can do as follows in the Camel route:<plain-text-body>{snippet:id=e2|lang=java|title=Invoke 2 parameter method|url=camel/trunk/camel-core/src/test/java/org/apache/camel/component/bean/BeanOverloadedMethodTest.java}</plain- text-body>We can also use a <code>*</code> as wildcard so we can just say we want to execute the method with 2 parameters we do<plain-text-body>{snippet:id=e3|lang=java|title=Invoke 2 parameter method using wildcard|url=camel/trunk/camel-core/src/test/java/org/apache/camel/component/bean/BeanOverloadedMethodTest.java}</plain-text-body>By default Camel will match the type name using the simple name, e.g. any leading package name will be disregarded. However if you want to match using the FQN, then specify the FQN type and Camel will leverage that. So if you have a <code>com.foo.MyOrder</code> and you want to match against the FQN, and <strong>not</strong> the simple name "MyOrder", then follow this example:</p><plain-text-body> .bean(OrderService.class, "doSomething(com.foo.MyOrder)") -</plain-text-body><rich-text-body><p>Camel currently only supports either specifying parameter binding or type per parameter in the method name option. You <strong>cannot</strong> specify both at the same time, such as</p><plain-text-body>doSomething(com.foo.MyOrder ${body}, boolean ${header.high}) -</plain-text-body><p>This may change in the future.</p></rich-text-body></div> + // process the in body and return whatever you want + return "Bye World"; + } +}Â ]]></script> +</div></div><h3 id="BeanBinding-Parameterbindingusingmethodoption"><br clear="none">Parameter binding using method option</h3><p><strong>Available as of Camel 2.9</strong></p><p>Camel uses the following rules to determine if it's a parameter value in the method option</p><ul class="alternate"><li>The value is either <code>true</code> or <code>false</code> which denotes a boolean value</li><li>The value is a numeric value such as <code>123</code> or <code>7</code></li><li>The value is a String enclosed with either single or double quotes</li><li>The value is null which denotes a <code>null</code> value</li><li>It can be evaluated using the <a shape="rect" href="simple.html">Simple</a> language, which means you can use, e.g., body, header.foo and other <a shape="rect" href="simple.html">Simple</a> tokens. Notice the tokens must be enclosed with ${ }.</li></ul><p>Any other value is consider to be a type declaration instead - see the next section about specifying types for overloaded me thods.</p><p>When invoking a <a shape="rect" href="bean.html">Bean</a> you can instruct Camel to invoke a specific method by providing the method name:</p><div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl"> +<script class="brush: java; gutter: false; theme: Default" type="syntaxhighlighter"><![CDATA[.bean(OrderService.class, "doSomething")]]></script> +</div></div><p> </p><p>Here we tell Camel to invoke the doSomething method - Camel handles the parameters' binding. Now suppose the method has 2 parameters, and the 2nd parameter is a boolean where we want to pass in a true value:</p><div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl"> +<script class="brush: java; gutter: false; theme: Default" type="syntaxhighlighter"><![CDATA[public void doSomething(String payload, boolean highPriority) { + ... +}]]></script> +</div></div><p> </p><p>This is now possible in <strong>Camel 2.9</strong> onwards:</p><div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl"> +<script class="brush: java; gutter: false; theme: Default" type="syntaxhighlighter"><![CDATA[.bean(OrderService.class, "doSomething(*, true)")Â ]]></script> +</div></div><p><br clear="none">In the example above, we defined the first parameter using the wild card symbol *, which tells Camel to bind this parameter to any type, and let Camel figure this out. The 2nd parameter has a fixed value of <code>true</code>. Instead of the wildcard symbol we can instruct Camel to use the message body as shown:</p><div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl"> +<script class="brush: java; gutter: false; theme: Default" type="syntaxhighlighter"><![CDATA[.bean(OrderService.class, "doSomething(${body}, true)")Â ]]></script> +</div></div><p> </p><p>The syntax of the parameters is using the <a shape="rect" href="simple.html">Simple</a> expression language so we have to use ${ } placeholders in the body to refer to the message body.</p><p>If you want to pass in a <code>null</code> value, then you can explicit define this in the method option as shown below:</p><div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl"> +<script class="brush: java; gutter: false; theme: Default" type="syntaxhighlighter"><![CDATA[.to("bean:orderService?method=doSomething(null, true)")]]></script> +</div></div><p><br clear="none">Specifying <code>null</code> as a parameter value instructs Camel to force passing a <code>null</code> value.</p><p>Besides the message body, you can pass in the message headers as a <code>java.util.Map</code>:</p><div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl"> +<script class="brush: java; gutter: false; theme: Default" type="syntaxhighlighter"><![CDATA[.bean(OrderService.class, "doSomethingWithHeaders(${body}, ${headers})")Â ]]></script> +</div></div><p>You can also pass in other fixed values besides booleans. For example, you can pass in a String and an integer:</p><div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl"> +<script class="brush: java; gutter: false; theme: Default" type="syntaxhighlighter"><![CDATA[.bean(MyBean.class, "echo('World', 5)")Â ]]></script> +</div></div><p><br clear="none">In the example above, we invoke the echo method with two parameters. The first has the content 'World' (without quotes), and the 2nd has the value of 5.<br clear="none"> Camel will automatically convert these values to the parameters' types.</p><p>Having the power of the <a shape="rect" href="simple.html">Simple</a> language allows us to bind to message headers and other values such as:</p><div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl"> +<script class="brush: java; gutter: false; theme: Default" type="syntaxhighlighter"><![CDATA[.bean(OrderService.class, "doSomething(${body}, ${header.high})")Â ]]></script> +</div></div><p>You can also use the OGNL support of the <a shape="rect" href="simple.html">Simple</a> expression language. Now suppose the message body is an object which has a method named <code>asXml</code>. To invoke the <code>asXml</code> method we can do as follows:</p><div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl"> +<script class="brush: java; gutter: false; theme: Default" type="syntaxhighlighter"><![CDATA[.bean(OrderService.class, "doSomething(${body.asXml}, ${header.high})")Â ]]></script> +</div></div><p>Instead of using <code>.bean</code> as shown in the examples above, you may want to use <code>.to</code> instead as shown:</p><div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl"> +<script class="brush: java; gutter: false; theme: Default" type="syntaxhighlighter"><![CDATA[.to("bean:orderService?method=doSomething(${body.asXml}, ${header.high})")Â ]]></script> +</div></div><h3 id="BeanBinding-Usingtypequalifierstoselectamongoverloadedmethods"><br clear="none">Using type qualifiers to select among overloaded methods</h3><p><strong>Available as of Camel 2.8</strong></p><p>If you have a <a shape="rect" href="bean.html">Bean</a> with overloaded methods, you can now specify parameter types in the method name so Camel can match the method you intend to use.<br clear="none"> Given the following bean:</p><div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl"> +<script class="brush: java; gutter: false; theme: Default" type="syntaxhighlighter"><![CDATA[Â from("direct:start") + .bean(MyBean.class, "hello(String)") + .to("mock:result");]]></script> +</div></div><p>Then the <code>MyBean</code> has 2 overloaded methods with the names <code>hello</code> and <code>times</code>. So if we want to use the method which has 2 parameters we can do as follows in the Camel route:</p><div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl"> +<script class="brush: java; gutter: false; theme: Default" type="syntaxhighlighter"><![CDATA[from("direct:start") + .bean(MyBean.class, "hello(String,String)") + .to("mock:result");Â ]]></script> +</div></div><p>We can also use a <code>*</code> as wildcard so we can just say we want to execute the method with 2 parameters we do</p><div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl"> +<script class="brush: java; gutter: false; theme: Default" type="syntaxhighlighter"><![CDATA[Â from("direct:start") + .bean(MyBean.class, "hello(*,*)") + .to("mock:result");]]></script> +</div></div><p>By default Camel will match the type name using the simple name, e.g. any leading package name will be disregarded. However if you want to match using the FQN, then specify the FQN type and Camel will leverage that. So if you have a <code>com.foo.MyOrder</code> and you want to match against the FQN, and <strong>not</strong> the simple name "MyOrder", then follow this example:</p><div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl"> +<script class="brush: java; gutter: false; theme: Default" type="syntaxhighlighter"><![CDATA[.bean(OrderService.class, "doSomething(com.foo.MyOrder)")]]></script> +</div></div><p><br clear="none">Camel currently only supports either specifying parameter binding or type per parameter in the method name option. You <strong>cannot</strong> specify both at the same time, such as</p><div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl"> +<script class="brush: java; gutter: false; theme: Default" type="syntaxhighlighter"><![CDATA[Â doSomething(com.foo.MyOrder ${body}, boolean ${header.high})]]></script> +</div></div><p>This may change in the future.</p></div> </td> <td valign="top"> <div class="navigation"> Modified: websites/production/camel/content/bean.html ============================================================================== --- websites/production/camel/content/bean.html (original) +++ websites/production/camel/content/bean.html Tue May 15 07:21:12 2018 @@ -36,6 +36,16 @@ <![endif]--> + <link href='//camel.apache.org/styles/highlighter/styles/shCoreCamel.css' rel='stylesheet' type='text/css' /> + <link href='//camel.apache.org/styles/highlighter/styles/shThemeCamel.css' rel='stylesheet' type='text/css' /> + <script src='//camel.apache.org/styles/highlighter/scripts/shCore.js' type='text/javascript'></script> + <script src='//camel.apache.org/styles/highlighter/scripts/shBrushJava.js' type='text/javascript'></script> + <script src='//camel.apache.org/styles/highlighter/scripts/shBrushXml.js' type='text/javascript'></script> + + <script type="text/javascript"> + SyntaxHighlighter.defaults['toolbar'] = false; + SyntaxHighlighter.all(); + </script> <title> Apache Camel: Bean @@ -78,27 +88,61 @@ <tbody> <tr> <td valign="top" width="100%"> -<div class="wiki-content maincontent"><h2 id="Bean-BeanComponent">Bean Component</h2><p>The <strong>bean:</strong> component binds beans to Camel message exchanges.</p><h3 id="Bean-URIformat">URI format</h3><plain-text-body>bean:beanID[?options] -</plain-text-body><p>Where <strong>beanID</strong> can be any string which is used to look up the bean in the <a shape="rect" href="registry.html">Registry</a></p><h3 id="Bean-Options">Options</h3><parameter ac:name="class">confluenceTableSmall</parameter><rich-text-body><div class="table-wrap"><table class="confluenceTable"><tbody><tr><th colspan="1" rowspan="1" class="confluenceTh"><p>Name</p></th><th colspan="1" rowspan="1" class="confluenceTh"><p>Type</p></th><th colspan="1" rowspan="1" class="confluenceTh"><p>Default</p></th><th colspan="1" rowspan="1" class="confluenceTh"><p>Description</p></th></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><p><code>method</code></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p><code>String</code></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p><code>null</code></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p>The method name from the bean that will be invoked. If not provided, Camel will try to det ermine the method itself. In case of ambiguity an exception will be thrown. See <a shape="rect" href="bean-binding.html">Bean Binding</a> for more details. From <strong>Camel 2.8</strong> onwards you can specify type qualifiers to pin-point the exact method to use for overloaded methods. From <strong>Camel 2.9</strong> onwards you can specify parameter values directly in the method syntax. See more details at <a shape="rect" href="bean-binding.html">Bean Binding</a>.</p></td></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><p><code>cache</code></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p><code>boolean</code></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p><code>false</code></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p>If enabled, Camel will cache the result of the first <a shape="rect" href="registry.html">Registry</a> look-up. Cache can be enabled if the bean in the <a shape="rect" href="registry.html">Registry</a> is defined as a singleton scope.</p></td></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><p><code>multiParameterArray</code></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p><code>boolean</code></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p><code>false</code></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p>How to treat the parameters which are passed from the message body; if it is <code>true</code>, the In message body should be an array of parameters.</p></td></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><p>bean.xxx</p></td><td colspan="1" rowspan="1" class="confluenceTd"> </td><td colspan="1" rowspan="1" class="confluenceTd"><p>null</p></td><td colspan="1" rowspan="1" class="confluenceTd"><p><strong style="line-height: 1.42857;">Camel 2.17:</strong> To configure additional options on the create bean instance from the class name. For example to configure a foo option on the bean, use bean.foo=123.</p></td></tr></tbody></table>< /div></rich-text-body><p>You can append query options to the URI in the following format, <code>?option=value&option=value&...</code></p><h3 id="Bean-Using">Using</h3><p>The object instance that is used to consume messages must be explicitly registered with the <a shape="rect" href="registry.html">Registry</a>. For example, if you are using Spring you must define the bean in the Spring configuration, <code>spring.xml</code>; or if you don't use Spring, by registering the bean in JNDI.<plain-text-body>{snippet:id=register|lang=java|url=camel/trunk/camel-core/src/test/java/org/apache/camel/component/pojo/PojoRouteTest.java}</plain-text-body>Once an endpoint has been registered, you can build Camel routes that use it to process exchanges.<plain-text-body>{snippet:id=route|lang=java|url=camel/trunk/camel-core/src/test/java/org/apache/camel/component/pojo/PojoRouteTest.java}</plain-text-body>A <strong>bean:</strong> endpoint cannot be defined as the input to the route; i.e. you c annot consume from it, you can only route from some inbound message <a shape="rect" href="endpoint.html">Endpoint</a> to the bean endpoint as output. So consider using a <strong>direct:</strong> or <strong>queue:</strong> endpoint as the input.</p><p>You can use the <code>createProxy()</code> methods on <a shape="rect" class="external-link" href="http://camel.apache.org/maven/current/camel-core/apidocs/org/apache/camel/component/bean/ProxyHelper.html">ProxyHelper</a> to create a proxy that will generate BeanExchanges and send them to any endpoint:<plain-text-body>{snippet:id=invoke|lang=java|url=camel/trunk/camel-core/src/test/java/org/apache/camel/component/pojo/PojoRouteTest.java}</plain-text-body>And the same route using Spring DSL:</p><parameter ac:name="">xml</parameter><plain-text-body><route> - <from uri="direct:hello"> - <to uri="bean:bye"/> -</route> -</plain-text-body><h3 id="Bean-Beanasendpoint">Bean as endpoint</h3><p>Camel also supports invoking <a shape="rect" href="bean.html">Bean</a> as an Endpoint. In the route below:<plain-text-body>{snippet:id=e1|lang=xml|url=camel/trunk/components/camel-spring/src/test/resources/org/apache/camel/spring/bind/beanAsEndpoint.xml}</plain-text-body>What happens is that when the exchange is routed to the <code>myBean</code> Camel will use the <a shape="rect" href="bean-binding.html">Bean Binding</a> to invoke the bean.<br clear="none"> The source for the bean is just a plain POJO:<plain-text-body>{snippet:id=e1|lang=java|url=camel/trunk/components/camel-spring/src/test/java/org/apache/camel/spring/bind/ExampleBean.java}</plain-text-body>Camel will use <a shape="rect" href="bean-binding.html">Bean Binding</a> to invoke the <code>sayHello</code> method, by converting the Exchange's In body to the <code>String</code> type and storing the output of the method on the Exchange Out body.</p><h3 id= "Bean-JavaDSLbeansyntax">Java DSL bean syntax</h3><p>Java DSL comes with syntactic sugar for the <a shape="rect" href="bean.html">Bean</a> component. Instead of specifying the bean explicitly as the endpoint (i.e. <code>to("bean:beanName")</code>) you can use the following syntax:</p><parameter ac:name="">java</parameter><plain-text-body>// Send message to the bean endpoint -// and invoke method resolved using Bean Binding. -from("direct:start").beanRef("beanName"); - -// Send message to the bean endpoint -// and invoke given method. -from("direct:start").beanRef("beanName", "methodName"); -</plain-text-body><p>Instead of passing name of the reference to the bean (so that Camel will lookup for it in the registry), you can specify the bean itself:</p><parameter ac:name="">java</parameter><plain-text-body>// Send message to the given bean instance. -from("direct:start").bean(new ExampleBean()); - +<div class="wiki-content maincontent"><h2 id="Bean-BeanComponent">Bean Component</h2><p>The <strong>bean:</strong> component binds beans to Camel message exchanges.</p><h3 id="Bean-URIformat">URI format</h3><p>bean:beanID[?options]</p><p>Where <strong>beanID</strong> can be any string which is used to look up the bean in the <a shape="rect" href="registry.html">Registry</a></p><h3 id="Bean-Options">Options</h3><p>confluenceTableSmall</p><div class="table-wrap"><table class="confluenceTable"><tbody><tr><th colspan="1" rowspan="1" class="confluenceTh"><p>Name</p></th><th colspan="1" rowspan="1" class="confluenceTh"><p>Type</p></th><th colspan="1" rowspan="1" class="confluenceTh"><p>Default</p></th><th colspan="1" rowspan="1" class="confluenceTh"><p>Description</p></th></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><p><code>method</code></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p><code>String</code></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p ><code>null</code></p></td><td colspan="1" rowspan="1" >class="confluenceTd"><p>The method name from the bean that will be invoked. >If not provided, Camel will try to determine the method itself. In case of >ambiguity an exception will be thrown. See <a shape="rect" >href="bean-binding.html">Bean Binding</a> for more details. From ><strong>Camel 2.8</strong> onwards you can specify type qualifiers to >pin-point the exact method to use for overloaded methods. From <strong>Camel >2.9</strong> onwards you can specify parameter values directly in the method >syntax. See more details at <a shape="rect" href="bean-binding.html">Bean >Binding</a>.</p></td></tr><tr><td colspan="1" rowspan="1" >class="confluenceTd"><p><code>cache</code></p></td><td colspan="1" >rowspan="1" class="confluenceTd"><p><code>boolean</code></p></td><td >colspan="1" rowspan="1" >class="confluenceTd"><p><code>false</code></p></td><td colspan="1" >rowspan="1" class="confluenceTd"><p>If enabled, Camel will cache the result >of the f irst <a shape="rect" href="registry.html">Registry</a> look-up. Cache can be enabled if the bean in the <a shape="rect" href="registry.html">Registry</a> is defined as a singleton scope.</p></td></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><p><code>multiParameterArray</code></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p><code>boolean</code></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p><code>false</code></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p>How to treat the parameters which are passed from the message body; if it is <code>true</code>, the In message body should be an array of parameters.</p></td></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><p>bean.xxx</p></td><td colspan="1" rowspan="1" class="confluenceTd"> </td><td colspan="1" rowspan="1" class="confluenceTd"><p>null</p></td><td colspan="1" rowspan="1" class="confluenceTd"><p><strong style="line-height: 1.42857;">Camel 2.17:</strong> To configur e additional options on the create bean instance from the class name. For example to configure a foo option on the bean, use bean.foo=123.</p></td></tr></tbody></table></div><p>You can append query options to the URI in the following format, <code>?option=value&option=value&...</code></p><h3 id="Bean-Using">Using</h3><p>The object instance that is used to consume messages must be explicitly registered with the <a shape="rect" href="registry.html">Registry</a>. For example, if you are using Spring you must define the bean in the Spring configuration, <code>spring.xml</code>; or if you don't use Spring, by registering the bean in JNDI.</p><div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl"> +<script class="brush: java; gutter: false; theme: Default" type="syntaxhighlighter"><![CDATA[// lets populate the context with the services we need +// note that we could just use a spring.xml file to avoid this step +JndiContext context = new JndiContext(); +context.bind("bye", new SayService("Good Bye!")); + +CamelContext camelContext = new DefaultCamelContext(context);]]></script> +</div></div><p>{snippet:id=register|lang=java|url=camel/trunk/camel-core/src/test/java/org/apache/camel/component/pojo/PojoRouteTest.java}</p><p>Once an endpoint has been registered, you can build Camel routes that use it to process exchanges.</p><div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl"> +<script class="brush: java; gutter: false; theme: Default" type="syntaxhighlighter"><![CDATA[camelContext.addRoutes(new RouteBuilder() { + public void configure() { + from("direct:hello").to("bean:bye"); + } +});]]></script> +</div></div><p>A <strong>bean:</strong> endpoint cannot be defined as the input to the route; i.e. you cannot consume from it, you can only route from some inbound message <a shape="rect" href="endpoint.html">Endpoint</a> to the bean endpoint as output. So consider using a <strong>direct:</strong> or <strong>queue:</strong> endpoint as the input.</p><p>You can use the <code>createProxy()</code> methods on <a shape="rect" class="external-link" href="http://camel.apache.org/maven/current/camel-core/apidocs/org/apache/camel/component/bean/ProxyHelper.html">ProxyHelper</a> to create a proxy that will generate BeanExchanges and send them to any endpoint:</p><div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl"> +<script class="brush: java; gutter: false; theme: Default" type="syntaxhighlighter"><![CDATA[Endpoint endpoint = camelContext.getEndpoint("direct:hello"); +ISay proxy = PojoComponent.createProxy(endpoint, ISay.class); +String rc = proxy.say(); +assertEquals("Good Bye!", rc);]]></script> +</div></div><p>And the same route using Spring DSL:</p><div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl"> +<script class="brush: xml; gutter: false; theme: Default" type="syntaxhighlighter"><![CDATA[<route> + <from uri="direct:hello"> + <to uri="bean:bye"/> +</route>]]></script> +</div></div><h3 id="Bean-Beanasendpoint"><br clear="none">Bean as endpoint</h3><p>Camel also supports invoking <a shape="rect" href="bean.html">Bean</a> as an Endpoint. In the route below:</p><div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl"> +<script class="brush: xml; gutter: false; theme: Default" type="syntaxhighlighter"><![CDATA[<camelContext xmlns="http://camel.apache.org/schema/spring"> + <route> + <from uri="direct:start"/> + <to uri="myBean"/> + <to uri="mock:results"/> + </route> +</camelContext> + +<bean id="myBean" class="org.apache.camel.spring.bind.ExampleBean"/>]]></script> +</div></div><p>What happens is that when the exchange is routed to the <code>myBean</code> Camel will use the <a shape="rect" href="bean-binding.html">Bean Binding</a> to invoke the bean.<br clear="none"> The source for the bean is just a plain POJO:</p><div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl"> +<script class="brush: java; gutter: false; theme: Default" type="syntaxhighlighter"><![CDATA[public class ExampleBean { + public String sayHello(String name) { + return "Hello " + name + "!"; + } +}]]></script> +</div></div><p>Camel will use <a shape="rect" href="bean-binding.html">Bean Binding</a> to invoke the <code>sayHello</code> method, by converting the Exchange's In body to the <code>String</code> type and storing the output of the method on the Exchange Out body.</p><h3 id="Bean-JavaDSLbeansyntax">Java DSL bean syntax</h3><p>Java DSL comes with syntactic sugar for the <a shape="rect" href="bean.html">Bean</a> component. Instead of specifying the bean explicitly as the endpoint (i.e. <code>to("bean:beanName")</code>) you can use the following syntax:</p><div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl"> +<script class="brush: java; gutter: false; theme: Default" type="syntaxhighlighter"><![CDATA[//Send message to the bean endpoint +// and invoke method resolved using Bean Binding. +from("direct:start").beanRef("beanName"); +Â +// Send message to the bean endpoint +// and invoke given method. +from("direct:start").beanRef("beanName", "methodName");]]></script> +</div></div><p><br clear="none">Instead of passing name of the reference to the bean (so that Camel will lookup for it in the registry), you can specify the bean itself:</p><div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl"> +<script class="brush: java; gutter: false; theme: Default" type="syntaxhighlighter"><![CDATA[// Send message to the given bean instance. +from("direct:start").bean(new ExampleBean()); // Explicit selection of bean method to be invoked. -from("direct:start").bean(new ExampleBean(), "methodName"); - +from("direct:start").bean(new ExampleBean(), "methodName"); // Camel will create the instance of bean and cache it for you. -from("direct:start").bean(ExampleBean.class); -</plain-text-body><h3 id="Bean-BeanBinding">Bean Binding</h3><p>How bean methods to be invoked are chosen (if they are not specified explicitly through the <strong>method</strong> parameter) and how parameter values are constructed from the <a shape="rect" href="message.html">Message</a> are all defined by the <a shape="rect" href="bean-binding.html">Bean Binding</a> mechanism which is used throughout all of the various <a shape="rect" href="bean-integration.html">Bean Integration</a> mechanisms in Camel.</p><p><parameter ac:name=""><a shape="rect" href="endpoint-see-also.html">Endpoint See Also</a></parameter></p><ul><li><a shape="rect" href="class.html">Class</a> component</li><li><a shape="rect" href="bean-binding.html">Bean Binding</a></li><li><a shape="rect" href="bean-integration.html">Bean Integration</a></li></ul></div> +from("direct:start").bean(ExampleBean.class);]]></script> +</div></div><h3 id="Bean-BeanBinding"><br clear="none">Bean Binding</h3><p>How bean methods to be invoked are chosen (if they are not specified explicitly through the <strong>method</strong> parameter) and how parameter values are constructed from the <a shape="rect" href="message.html">Message</a> are all defined by the <a shape="rect" href="bean-binding.html">Bean Binding</a> mechanism which is used throughout all of the various <a shape="rect" href="bean-integration.html">Bean Integration</a> mechanisms in Camel.</p><p><a shape="rect" href="endpoint-see-also.html">Endpoint See Also</a></p><ul><li><a shape="rect" href="class.html">Class</a> component</li><li><a shape="rect" href="bean-binding.html">Bean Binding</a></li><li><a shape="rect" href="bean-integration.html">Bean Integration</a></li></ul></div> </td> <td valign="top"> <div class="navigation"> Modified: websites/production/camel/content/book-component-appendix.html ============================================================================== --- websites/production/camel/content/book-component-appendix.html (original) +++ websites/production/camel/content/book-component-appendix.html Tue May 15 07:21:12 2018 @@ -324,27 +324,61 @@ registry.bind("client", client </dependency> </plain-text-body><h3 id="BookComponentAppendix-URIformat.2">URI format</h3><plain-text-body>atom://atomUri[?options] </plain-text-body><p>Where <strong>atomUri</strong> is the URI to the Atom feed to poll.</p><h3 id="BookComponentAppendix-Options.1">Options</h3><parameter ac:name="class">confluenceTableSmall</parameter><rich-text-body><div class="table-wrap"><table class="confluenceTable"><tbody><tr><th colspan="1" rowspan="1" class="confluenceTh"><p>Property</p></th><th colspan="1" rowspan="1" class="confluenceTh"><p>Default</p></th><th colspan="1" rowspan="1" class="confluenceTh"><p>Description</p></th></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><p><code>splitEntries</code></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p><code>true</code></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p>If <code>true</code> Camel will poll the feed and for the subsequent polls return each entry poll by poll. If the feed contains 7 entries then Camel will return the first entry on the first poll, the 2nd entry on the next poll, until no more entries where as Camel will do a ne w update on the feed. If <code>false</code> then Camel will poll a fresh feed on every invocation.</p></td></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><p><code>filter</code></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p><code>true</code></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p>Is only used by the split entries to filter the entries to return. Camel will default use the <code>UpdateDateFilter</code> that only return new entries from the feed. So the client consuming from the feed never receives the same entry more than once. The filter will return the entries ordered by the newest last.</p></td></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><p><code>lastUpdate</code></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p><code>null</code></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p>Is only used by the filter, as the starting timestamp for selection never entries (uses the <code>entry.updated</code> timest amp). Syntax format is: <code>yyyy-MM-ddTHH:MM:ss</code>. Example: <code>2007-12-24T17:45:59</code>.</p></td></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><p><code>throttleEntries</code></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p><code>true</code></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p><strong>Camel 2.5:</strong> Sets whether all entries identified in a single feed poll should be delivered immediately. If <code>true</code>, only one entry is processed per <code>consumer.delay</code>. Only applicable when <code>splitEntries</code> is set to <code>true</code>.</p></td></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><p><code>feedHeader</code></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p><code>true</code></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p>Sets whether to add the Abdera Feed object as a header.</p></td></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><p><code>sortEntries</code></ p></td><td colspan="1" rowspan="1" class="confluenceTd"><p><code>false</code></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p>If <code>splitEntries</code> is <code>true</code>, this sets whether to sort those entries by updated date.</p></td></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><p><code>consumer.delay</code></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p><code>500</code></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p>Delay in millis between each poll.</p></td></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><p><code>consumer.initialDelay</code></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p><code>1000</code></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p>Millis before polling starts.</p></td></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><p><code>consumer.userFixedDelay</code></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p><code>false</code></p></td><td colspan="1" r owspan="1" class="confluenceTd"><p>If <code>true</code>, use fixed delay between pools, otherwise fixed rate is used. See <a shape="rect" class="external-link" href="http://java.sun.com/j2se/1.5.0/docs/api/java/util/concurrent/ScheduledExecutorService.html" rel="nofollow">ScheduledExecutorService</a> in JDK for details.</p></td></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><code>username</code></td><td colspan="1" rowspan="1" class="confluenceTd"> </td><td colspan="1" rowspan="1" class="confluenceTd"><strong>Camel 2.16:</strong> For basic authentication when polling from a HTTP feed</td></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><code>password</code></td><td colspan="1" rowspan="1" class="confluenceTd"> </td><td colspan="1" rowspan="1" class="confluenceTd"><strong>Camel 2.16:</strong><span> For basic authentication when polling from a HTTP feed</span></td></tr></tbody></table></div></rich-text-body><p>You can append query options to the URI in th e following format, <code>?option=value&option=value&...</code></p><h3 id="BookComponentAppendix-Exchangedataformat">Exchange data format</h3><p>Camel will set the In body on the returned <code>Exchange</code> with the entries. Depending on the <code>splitEntries</code> flag Camel will either return one <code>Entry</code> or a <code>List<Entry></code>.</p><parameter ac:name="class">confluenceTableSmall</parameter><rich-text-body><div class="table-wrap"><table class="confluenceTable"><tbody><tr><th colspan="1" rowspan="1" class="confluenceTh"><p>Option</p></th><th colspan="1" rowspan="1" class="confluenceTh"><p>Value</p></th><th colspan="1" rowspan="1" class="confluenceTh"><p>Behavior</p></th></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><p><code>splitEntries</code></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p><code>true</code></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p>Only a single entry from the currently being processed fe ed is set: <code>exchange.in.body(Entry)</code></p></td></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><p><code>splitEntries</code></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p><code>false</code></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p>The entire list of entries from the feed is set: <code>exchange.in.body(List<Entry>)</code></p></td></tr></tbody></table></div></rich-text-body><p>Camel can set the <code>Feed</code> object on the In header (see <code>feedHeader</code> option to disable this):</p><h3 id="BookComponentAppendix-MessageHeaders">Message Headers</h3><p>Camel atom uses these headers.</p><parameter ac:name="class">confluenceTableSmall</parameter><rich-text-body><div class="table-wrap"><table class="confluenceTable"><tbody><tr><th colspan="1" rowspan="1" class="confluenceTh"><p>Header</p></th><th colspan="1" rowspan="1" class="confluenceTh"><p>Description</p></th></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><p>< code>CamelAtomFeed</code></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p>When consuming the <code>org.apache.abdera.model.Feed</code> object is set to this header.</p></td></tr></tbody></table></div></rich-text-body><h3 id="BookComponentAppendix-Samples">Samples</h3><p>In this sample we poll James Strachan's blog.</p><plain-text-body>from("atom://http://macstrac.blogspot.com/feeds/posts/default").to("seda:feeds"); -</plain-text-body><p>In this sample we want to filter only good blogs we like to a SEDA queue. The sample also shows how to setup Camel standalone, not running in any Container or using Spring.<plain-text-body>{snippet:id=e1|lang=java|url=camel/trunk/components/camel-atom/src/test/java/org/apache/camel/component/atom/AtomGoodBlogsTest.java}</plain-text-body><parameter ac:name=""><a shape="rect" href="endpoint-see-also.html">Endpoint See Also</a></parameter></p><ul class="alternate"><li><a shape="rect" href="rss.html">RSS</a></li></ul> <h2 id="BookComponentAppendix-BeanComponent">Bean Component</h2><p>The <strong>bean:</strong> component binds beans to Camel message exchanges.</p><h3 id="BookComponentAppendix-URIformat.3">URI format</h3><plain-text-body>bean:beanID[?options] -</plain-text-body><p>Where <strong>beanID</strong> can be any string which is used to look up the bean in the <a shape="rect" href="registry.html">Registry</a></p><h3 id="BookComponentAppendix-Options.2">Options</h3><parameter ac:name="class">confluenceTableSmall</parameter><rich-text-body><div class="table-wrap"><table class="confluenceTable"><tbody><tr><th colspan="1" rowspan="1" class="confluenceTh"><p>Name</p></th><th colspan="1" rowspan="1" class="confluenceTh"><p>Type</p></th><th colspan="1" rowspan="1" class="confluenceTh"><p>Default</p></th><th colspan="1" rowspan="1" class="confluenceTh"><p>Description</p></th></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><p><code>method</code></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p><code>String</code></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p><code>null</code></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p>The method name from the bean that will be invoked. If not provided, Ca mel will try to determine the method itself. In case of ambiguity an exception will be thrown. See <a shape="rect" href="bean-binding.html">Bean Binding</a> for more details. From <strong>Camel 2.8</strong> onwards you can specify type qualifiers to pin-point the exact method to use for overloaded methods. From <strong>Camel 2.9</strong> onwards you can specify parameter values directly in the method syntax. See more details at <a shape="rect" href="bean-binding.html">Bean Binding</a>.</p></td></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><p><code>cache</code></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p><code>boolean</code></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p><code>false</code></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p>If enabled, Camel will cache the result of the first <a shape="rect" href="registry.html">Registry</a> look-up. Cache can be enabled if the bean in the <a shape="rect" href="registry.html">Registry< /a> is defined as a singleton scope.</p></td></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><p><code>multiParameterArray</code></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p><code>boolean</code></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p><code>false</code></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p>How to treat the parameters which are passed from the message body; if it is <code>true</code>, the In message body should be an array of parameters.</p></td></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><p>bean.xxx</p></td><td colspan="1" rowspan="1" class="confluenceTd"> </td><td colspan="1" rowspan="1" class="confluenceTd"><p>null</p></td><td colspan="1" rowspan="1" class="confluenceTd"><p><strong style="line-height: 1.42857;">Camel 2.17:</strong> To configure additional options on the create bean instance from the class name. For example to configure a foo option on the bean, use bean.foo=123.</p></td></t r></tbody></table></div></rich-text-body><p>You can append query options to the URI in the following format, <code>?option=value&option=value&...</code></p><h3 id="BookComponentAppendix-Using">Using</h3><p>The object instance that is used to consume messages must be explicitly registered with the <a shape="rect" href="registry.html">Registry</a>. For example, if you are using Spring you must define the bean in the Spring configuration, <code>spring.xml</code>; or if you don't use Spring, by registering the bean in JNDI.<plain-text-body>{snippet:id=register|lang=java|url=camel/trunk/camel-core/src/test/java/org/apache/camel/component/pojo/PojoRouteTest.java}</plain-text-body>Once an endpoint has been registered, you can build Camel routes that use it to process exchanges.<plain-text-body>{snippet:id=route|lang=java|url=camel/trunk/camel-core/src/test/java/org/apache/camel/component/pojo/PojoRouteTest.java}</plain-text-body>A <strong>bean:</strong> endpoint cannot be defined a s the input to the route; i.e. you cannot consume from it, you can only route from some inbound message <a shape="rect" href="endpoint.html">Endpoint</a> to the bean endpoint as output. So consider using a <strong>direct:</strong> or <strong>queue:</strong> endpoint as the input.</p><p>You can use the <code>createProxy()</code> methods on <a shape="rect" class="external-link" href="http://camel.apache.org/maven/current/camel-core/apidocs/org/apache/camel/component/bean/ProxyHelper.html">ProxyHelper</a> to create a proxy that will generate BeanExchanges and send them to any endpoint:<plain-text-body>{snippet:id=invoke|lang=java|url=camel/trunk/camel-core/src/test/java/org/apache/camel/component/pojo/PojoRouteTest.java}</plain-text-body>And the same route using Spring DSL:</p><parameter ac:name="">xml</parameter><plain-text-body><route> - <from uri="direct:hello"> - <to uri="bean:bye"/> -</route> -</plain-text-body><h3 id="BookComponentAppendix-Beanasendpoint">Bean as endpoint</h3><p>Camel also supports invoking <a shape="rect" href="bean.html">Bean</a> as an Endpoint. In the route below:<plain-text-body>{snippet:id=e1|lang=xml|url=camel/trunk/components/camel-spring/src/test/resources/org/apache/camel/spring/bind/beanAsEndpoint.xml}</plain-text-body>What happens is that when the exchange is routed to the <code>myBean</code> Camel will use the <a shape="rect" href="bean-binding.html">Bean Binding</a> to invoke the bean.<br clear="none"> The source for the bean is just a plain POJO:<plain-text-body>{snippet:id=e1|lang=java|url=camel/trunk/components/camel-spring/src/test/java/org/apache/camel/spring/bind/ExampleBean.java}</plain-text-body>Camel will use <a shape="rect" href="bean-binding.html">Bean Binding</a> to invoke the <code>sayHello</code> method, by converting the Exchange's In body to the <code>String</code> type and storing the output of the method on the Exchange Out body.</p><h3 id="BookComponentAppendix-JavaDSLbeansyntax">Java DSL bean syntax</h3><p>Java DSL comes with syntactic sugar for the <a shape="rect" href="bean.html">Bean</a> component. Instead of specifying the bean explicitly as the endpoint (i.e. <code>to("bean:beanName")</code>) you can use the following syntax:</p><parameter ac:name="">java</parameter><plain-text-body>// Send message to the bean endpoint -// and invoke method resolved using Bean Binding. -from("direct:start").beanRef("beanName"); +</plain-text-body><p>In this sample we want to filter only good blogs we like to a SEDA queue. The sample also shows how to setup Camel standalone, not running in any Container or using Spring.<plain-text-body>{snippet:id=e1|lang=java|url=camel/trunk/components/camel-atom/src/test/java/org/apache/camel/component/atom/AtomGoodBlogsTest.java}</plain-text-body><parameter ac:name=""><a shape="rect" href="endpoint-see-also.html">Endpoint See Also</a></parameter></p><ul class="alternate"><li><a shape="rect" href="rss.html">RSS</a></li></ul> <h2 id="BookComponentAppendix-BeanComponent">Bean Component</h2><p>The <strong>bean:</strong> component binds beans to Camel message exchanges.</p><h3 id="BookComponentAppendix-URIformat.3">URI format</h3><p>bean:beanID[?options]</p><p>Where <strong>beanID</strong> can be any string which is used to look up the bean in the <a shape="rect" href="registry.html">Registry</a></p><h3 id="BookComponentAppendix-Options.2">Options</h3><p>confluenceTableSmall</ p><div class="table-wrap"><table class="confluenceTable"><tbody><tr><th colspan="1" rowspan="1" class="confluenceTh"><p>Name</p></th><th colspan="1" rowspan="1" class="confluenceTh"><p>Type</p></th><th colspan="1" rowspan="1" class="confluenceTh"><p>Default</p></th><th colspan="1" rowspan="1" class="confluenceTh"><p>Description</p></th></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><p><code>method</code></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p><code>String</code></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p><code>null</code></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p>The method name from the bean that will be invoked. If not provided, Camel will try to determine the method itself. In case of ambiguity an exception will be thrown. See <a shape="rect" href="bean-binding.html">Bean Binding</a> for more details. From <strong>Camel 2.8</strong> onwards you can specify type qualifiers to pin-point the exact method to use for o verloaded methods. From <strong>Camel 2.9</strong> onwards you can specify parameter values directly in the method syntax. See more details at <a shape="rect" href="bean-binding.html">Bean Binding</a>.</p></td></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><p><code>cache</code></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p><code>boolean</code></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p><code>false</code></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p>If enabled, Camel will cache the result of the first <a shape="rect" href="registry.html">Registry</a> look-up. Cache can be enabled if the bean in the <a shape="rect" href="registry.html">Registry</a> is defined as a singleton scope.</p></td></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><p><code>multiParameterArray</code></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p><code>boolean</code></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p><code>fal se</code></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p>How to treat the parameters which are passed from the message body; if it is <code>true</code>, the In message body should be an array of parameters.</p></td></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><p>bean.xxx</p></td><td colspan="1" rowspan="1" class="confluenceTd"> </td><td colspan="1" rowspan="1" class="confluenceTd"><p>null</p></td><td colspan="1" rowspan="1" class="confluenceTd"><p><strong style="line-height: 1.42857;">Camel 2.17:</strong> To configure additional options on the create bean instance from the class name. For example to configure a foo option on the bean, use bean.foo=123.</p></td></tr></tbody></table></div><p>You can append query options to the URI in the following format, <code>?option=value&option=value&...</code></p><h3 id="BookComponentAppendix-Using">Using</h3><p>The object instance that is used to consume messages must be explicitly registered with the <a shape="rect" href="registry.html">Registry</a>. For example, if you are using Spring you must define the bean in the Spring configuration, <code>spring.xml</code>; or if you don't use Spring, by registering the bean in JNDI.</p><div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl"> +<script class="brush: java; gutter: false; theme: Default" type="syntaxhighlighter"><![CDATA[// lets populate the context with the services we need +// note that we could just use a spring.xml file to avoid this step +JndiContext context = new JndiContext(); +context.bind("bye", new SayService("Good Bye!")); -// Send message to the bean endpoint -// and invoke given method. -from("direct:start").beanRef("beanName", "methodName"); -</plain-text-body><p>Instead of passing name of the reference to the bean (so that Camel will lookup for it in the registry), you can specify the bean itself:</p><parameter ac:name="">java</parameter><plain-text-body>// Send message to the given bean instance. -from("direct:start").bean(new ExampleBean()); +CamelContext camelContext = new DefaultCamelContext(context);]]></script> +</div></div><p>{snippet:id=register|lang=java|url=camel/trunk/camel-core/src/test/java/org/apache/camel/component/pojo/PojoRouteTest.java}</p><p>Once an endpoint has been registered, you can build Camel routes that use it to process exchanges.</p><div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl"> +<script class="brush: java; gutter: false; theme: Default" type="syntaxhighlighter"><![CDATA[camelContext.addRoutes(new RouteBuilder() { + public void configure() { + from("direct:hello").to("bean:bye"); + } +});]]></script> +</div></div><p>A <strong>bean:</strong> endpoint cannot be defined as the input to the route; i.e. you cannot consume from it, you can only route from some inbound message <a shape="rect" href="endpoint.html">Endpoint</a> to the bean endpoint as output. So consider using a <strong>direct:</strong> or <strong>queue:</strong> endpoint as the input.</p><p>You can use the <code>createProxy()</code> methods on <a shape="rect" class="external-link" href="http://camel.apache.org/maven/current/camel-core/apidocs/org/apache/camel/component/bean/ProxyHelper.html">ProxyHelper</a> to create a proxy that will generate BeanExchanges and send them to any endpoint:</p><div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl"> +<script class="brush: java; gutter: false; theme: Default" type="syntaxhighlighter"><![CDATA[Endpoint endpoint = camelContext.getEndpoint("direct:hello"); +ISay proxy = PojoComponent.createProxy(endpoint, ISay.class); +String rc = proxy.say(); +assertEquals("Good Bye!", rc);]]></script> +</div></div><p>And the same route using Spring DSL:</p><div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl"> +<script class="brush: xml; gutter: false; theme: Default" type="syntaxhighlighter"><![CDATA[<route> + <from uri="direct:hello"> + <to uri="bean:bye"/> +</route>]]></script> +</div></div><h3 id="BookComponentAppendix-Beanasendpoint"><br clear="none">Bean as endpoint</h3><p>Camel also supports invoking <a shape="rect" href="bean.html">Bean</a> as an Endpoint. In the route below:</p><div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl"> +<script class="brush: xml; gutter: false; theme: Default" type="syntaxhighlighter"><![CDATA[<camelContext xmlns="http://camel.apache.org/schema/spring"> + <route> + <from uri="direct:start"/> + <to uri="myBean"/> + <to uri="mock:results"/> + </route> +</camelContext> +<bean id="myBean" class="org.apache.camel.spring.bind.ExampleBean"/>]]></script> +</div></div><p>What happens is that when the exchange is routed to the <code>myBean</code> Camel will use the <a shape="rect" href="bean-binding.html">Bean Binding</a> to invoke the bean.<br clear="none"> The source for the bean is just a plain POJO:</p><div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl"> +<script class="brush: java; gutter: false; theme: Default" type="syntaxhighlighter"><![CDATA[public class ExampleBean { + public String sayHello(String name) { + return "Hello " + name + "!"; + } +}]]></script> +</div></div><p>Camel will use <a shape="rect" href="bean-binding.html">Bean Binding</a> to invoke the <code>sayHello</code> method, by converting the Exchange's In body to the <code>String</code> type and storing the output of the method on the Exchange Out body.</p><h3 id="BookComponentAppendix-JavaDSLbeansyntax">Java DSL bean syntax</h3><p>Java DSL comes with syntactic sugar for the <a shape="rect" href="bean.html">Bean</a> component. Instead of specifying the bean explicitly as the endpoint (i.e. <code>to("bean:beanName")</code>) you can use the following syntax:</p><div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl"> +<script class="brush: java; gutter: false; theme: Default" type="syntaxhighlighter"><![CDATA[//Send message to the bean endpoint +// and invoke method resolved using Bean Binding. +from("direct:start").beanRef("beanName"); +Â +// Send message to the bean endpoint +// and invoke given method. +from("direct:start").beanRef("beanName", "methodName");]]></script> +</div></div><p><br clear="none">Instead of passing name of the reference to the bean (so that Camel will lookup for it in the registry), you can specify the bean itself:</p><div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl"> +<script class="brush: java; gutter: false; theme: Default" type="syntaxhighlighter"><![CDATA[// Send message to the given bean instance. +from("direct:start").bean(new ExampleBean()); // Explicit selection of bean method to be invoked. -from("direct:start").bean(new ExampleBean(), "methodName"); - +from("direct:start").bean(new ExampleBean(), "methodName"); // Camel will create the instance of bean and cache it for you. -from("direct:start").bean(ExampleBean.class); -</plain-text-body><h3 id="BookComponentAppendix-BeanBinding">Bean Binding</h3><p>How bean methods to be invoked are chosen (if they are not specified explicitly through the <strong>method</strong> parameter) and how parameter values are constructed from the <a shape="rect" href="message.html">Message</a> are all defined by the <a shape="rect" href="bean-binding.html">Bean Binding</a> mechanism which is used throughout all of the various <a shape="rect" href="bean-integration.html">Bean Integration</a> mechanisms in Camel.</p><p><parameter ac:name=""><a shape="rect" href="endpoint-see-also.html">Endpoint See Also</a></parameter></p><ul><li><a shape="rect" href="class.html">Class</a> component</li><li><a shape="rect" href="bean-binding.html">Bean Binding</a></li><li><a shape="rect" href="bean-integration.html">Bean Integration</a></li></ul> <div class="error"><span class="error">Unable to render {include}</span> The included page could not be found.</div> <h2 id="BookComponentAppendix -BrowseComponent">Browse Component</h2> +from("direct:start").bean(ExampleBean.class);]]></script> +</div></div><h3 id="BookComponentAppendix-BeanBinding"><br clear="none">Bean Binding</h3><p>How bean methods to be invoked are chosen (if they are not specified explicitly through the <strong>method</strong> parameter) and how parameter values are constructed from the <a shape="rect" href="message.html">Message</a> are all defined by the <a shape="rect" href="bean-binding.html">Bean Binding</a> mechanism which is used throughout all of the various <a shape="rect" href="bean-integration.html">Bean Integration</a> mechanisms in Camel.</p><p><a shape="rect" href="endpoint-see-also.html">Endpoint See Also</a></p><ul><li><a shape="rect" href="class.html">Class</a> component</li><li><a shape="rect" href="bean-binding.html">Bean Binding</a></li><li><a shape="rect" href="bean-integration.html">Bean Integration</a></li></ul> <div class="error"><span class="error">Unable to render {include}</span> The included page could not be found.</div> <h2 id="BookComponentAppendix-BrowseComponent">Brows e Component</h2> <p>The Browse component provides a simple <a shape="rect" href="browsableendpoint.html">BrowsableEndpoint</a> which can be useful for testing, visualisation tools or debugging. The exchanges sent to the endpoint are all available to be browsed.</p>