Routes
Camel supports the definition of routing rules using a Java DSL (domain specific language) which avoids the need for cumbersome XML using a RouteBuilder.
For example a simple route can be created as follows.
RouteBuilder builder = new RouteBuilder() {
public void configure() {
from("seda:a").to("seda:b");
}
};
As you can see from the above Camel uses URIs to wire endpoints together.
Filters
You can combine simple routes with filters which can be arbitrary Predicate implementations.
RouteBuilder builder = new RouteBuilder() {
public void configure() {
from("seda:a").filter(header("foo").isEqualTo("bar")).to("seda:b");
}
};
Choices
With a choice you provide a list of predicates and outcomes along with an optional default otherwise clause which is invoked if none of the conditions are met.
RouteBuilder builder = new RouteBuilder() {
public void configure() {
from("seda:a").choice().when(header("foo").isEqualTo("bar")).to("seda:b")
.when(header("foo").isEqualTo("cheese")).to("seda:c").otherwise().to("seda:d");
}
};
Using a custom processor
Here is an example of using a custom Processor
myProcessor = new Processor() {
public void process(Exchange exchange) {
log.debug("Called with exchange: " + exchange);
}
};
RouteBuilder builder = new RouteBuilder() {
public void configure() {
from("seda:a").process(myProcessor);
}
};
You can mix and match custom processors with filters and choices.
RouteBuilder builder = new RouteBuilder() {
public void configure() {
from("seda:a").filter(header("foo").isEqualTo("bar")).process(myProcessor);
}
};
Interceptors
Here is an example of adding a few custom InterceptorProcessor![]()
objects to a processing pipeline:
interceptor2 = new MyInterceptorProcessor();
RouteBuilder builder = new RouteBuilder() {
public void configure() {
from("seda:a").intercept(interceptor1).intercept(interceptor2).to("seda:d");
}
};
When you start defining and interceptor stack with intercept(), you must follow up with the subsequent .target() so that the target of the interceptor stack is properly registered.
