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new 52bbd0e CAMEL-16819 (#5901)
52bbd0e is described below
commit 52bbd0e83f1b723d0b4cda51a84152ca5fafed09
Author: Jose Montoya <ja...@users.noreply.github.com>
AuthorDate: Sun Aug 1 08:09:14 2021 -0500
CAMEL-16819 (#5901)
* exploratory support for configurable ExceptionPolicyStrategy
* refactor to find strategy from context
* add custom exception policy test
---
.../DefaultExceptionPolicyStrategy.java | 10 +-
.../errorhandler/ErrorHandlerSupport.java | 2 +-
.../errorhandler/RedeliveryErrorHandler.java | 6 ++
.../CustomExceptionPolicyStrategyTest.java | 115 +++++++++++++++++++++
4 files changed, 127 insertions(+), 6 deletions(-)
diff --git
a/core/camel-core-processor/src/main/java/org/apache/camel/processor/errorhandler/DefaultExceptionPolicyStrategy.java
b/core/camel-core-processor/src/main/java/org/apache/camel/processor/errorhandler/DefaultExceptionPolicyStrategy.java
index 9eb210b..45aab86 100644
---
a/core/camel-core-processor/src/main/java/org/apache/camel/processor/errorhandler/DefaultExceptionPolicyStrategy.java
+++
b/core/camel-core-processor/src/main/java/org/apache/camel/processor/errorhandler/DefaultExceptionPolicyStrategy.java
@@ -51,7 +51,7 @@ import org.slf4j.LoggerFactory;
* for more fine grained matching, so you can e.g. define multiple sets of
exception types with the same exception
* class(es) but have a predicate attached to select which to select at
runtime.
*/
-public final class DefaultExceptionPolicyStrategy implements
ExceptionPolicyStrategy {
+public class DefaultExceptionPolicyStrategy implements ExceptionPolicyStrategy
{
// thread safe so we can use a shared instance
public static final DefaultExceptionPolicyStrategy INSTANCE = new
DefaultExceptionPolicyStrategy();
@@ -114,7 +114,7 @@ public final class DefaultExceptionPolicyStrategy
implements ExceptionPolicyStra
}
}
- private static boolean findMatchedExceptionPolicy(
+ private boolean findMatchedExceptionPolicy(
Iterable<ExceptionPolicyKey> exceptionPolicies,
Exchange exchange, Throwable exception,
Map<Integer, ExceptionPolicyKey> candidates) {
@@ -204,7 +204,7 @@ public final class DefaultExceptionPolicyStrategy
implements ExceptionPolicyStra
* @param exception the thrown exception
* @return <tt>true</tt> if the to current exception class
is a candidate, <tt>false</tt> to skip it.
*/
- protected static boolean filter(ExceptionPolicyKey type, Class<?>
exceptionClass, Throwable exception) {
+ protected boolean filter(ExceptionPolicyKey type, Class<?> exceptionClass,
Throwable exception) {
// must be instance of check to ensure that the exceptionClass is one
type of the thrown exception
return exceptionClass.isInstance(exception);
}
@@ -222,7 +222,7 @@ public final class DefaultExceptionPolicyStrategy
implements ExceptionPolicyStra
* @param exchange the current {@link Exchange}
* @return <tt>true</tt> if matched, <tt>false</tt> otherwise.
*/
- protected static boolean matchesWhen(ExceptionPolicyKey definition,
Exchange exchange) {
+ protected boolean matchesWhen(ExceptionPolicyKey definition, Exchange
exchange) {
if (definition.getWhen() == null) {
// if no predicate then it's always a match
return true;
@@ -239,7 +239,7 @@ public final class DefaultExceptionPolicyStrategy
implements ExceptionPolicyStra
* @param exception the exception
* @return the list to iterate
*/
- protected static Iterable<Throwable> createExceptionIterable(Throwable
exception) {
+ protected Iterable<Throwable> createExceptionIterable(Throwable exception)
{
return ObjectHelper.createExceptionIterable(exception);
}
diff --git
a/core/camel-core-processor/src/main/java/org/apache/camel/processor/errorhandler/ErrorHandlerSupport.java
b/core/camel-core-processor/src/main/java/org/apache/camel/processor/errorhandler/ErrorHandlerSupport.java
index acec522..460bc75 100644
---
a/core/camel-core-processor/src/main/java/org/apache/camel/processor/errorhandler/ErrorHandlerSupport.java
+++
b/core/camel-core-processor/src/main/java/org/apache/camel/processor/errorhandler/ErrorHandlerSupport.java
@@ -39,7 +39,7 @@ public abstract class ErrorHandlerSupport extends
ChildServiceSupport implements
DEFAULT_EXCHANGE_FORMATTER.setStyle(DefaultExchangeFormatter.OutputStyle.Fixed);
}
// optimize to use a shared instance
- protected final ExceptionPolicyStrategy exceptionPolicy =
DefaultExceptionPolicyStrategy.INSTANCE;
+ protected ExceptionPolicyStrategy exceptionPolicy =
DefaultExceptionPolicyStrategy.INSTANCE;
protected Map<ExceptionPolicyKey, ExceptionPolicy> exceptionPolicies;
public void addErrorHandler(Processor errorHandler) {
diff --git
a/core/camel-core-processor/src/main/java/org/apache/camel/processor/errorhandler/RedeliveryErrorHandler.java
b/core/camel-core-processor/src/main/java/org/apache/camel/processor/errorhandler/RedeliveryErrorHandler.java
index 7de06ee..eddc219 100644
---
a/core/camel-core-processor/src/main/java/org/apache/camel/processor/errorhandler/RedeliveryErrorHandler.java
+++
b/core/camel-core-processor/src/main/java/org/apache/camel/processor/errorhandler/RedeliveryErrorHandler.java
@@ -18,6 +18,7 @@ package org.apache.camel.processor.errorhandler;
import java.util.ArrayList;
import java.util.List;
+import java.util.Set;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.RejectedExecutionException;
import java.util.concurrent.ScheduledExecutorService;
@@ -160,6 +161,11 @@ public abstract class RedeliveryErrorHandler extends
ErrorHandlerSupport
throw RuntimeCamelException.wrapRuntimeCamelException(e);
}
}
+
+ Set<ExceptionPolicyStrategy> policies =
this.camelContext.getRegistry().findByType(ExceptionPolicyStrategy.class);
+ if (policies.size() == 1) {
+ exceptionPolicy = policies.iterator().next();
+ }
}
RedeliveryErrorHandler(Logger log) {
diff --git
a/core/camel-core/src/test/java/org/apache/camel/processor/exceptionpolicy/CustomExceptionPolicyStrategyTest.java
b/core/camel-core/src/test/java/org/apache/camel/processor/exceptionpolicy/CustomExceptionPolicyStrategyTest.java
new file mode 100644
index 0000000..378cb59
--- /dev/null
+++
b/core/camel-core/src/test/java/org/apache/camel/processor/exceptionpolicy/CustomExceptionPolicyStrategyTest.java
@@ -0,0 +1,115 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.camel.processor.exceptionpolicy;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+import org.apache.camel.ContextTestSupport;
+import org.apache.camel.Exchange;
+import org.apache.camel.Processor;
+import org.apache.camel.builder.RouteBuilder;
+import org.apache.camel.component.mock.MockEndpoint;
+import org.apache.camel.processor.errorhandler.DefaultExceptionPolicyStrategy;
+import org.apache.camel.processor.errorhandler.ExceptionPolicyStrategy;
+import org.apache.camel.spi.Registry;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.fail;
+
+/**
+ * Unit test for a custom ExceptionPolicy
+ */
+public class CustomExceptionPolicyStrategyTest extends ContextTestSupport {
+
+ private static final String ERROR_QUEUE = "mock:error";
+ private static final String ERROR_USER_QUEUE = "mock:usererror";
+
+ public static class MyUserException extends IllegalStateException {
+ private static final long serialVersionUID = 1L;
+
+ public MyUserException(String message) {
+ super(message);
+ }
+
+ protected MyUserException(String message, Throwable cause) {
+ super(message, cause);
+ }
+ }
+
+ @Override
+ protected Registry createRegistry() throws Exception {
+ Registry answer = super.createRegistry();
+ answer.bind("reverse-strategy", ExceptionPolicyStrategy.class, new
DefaultExceptionPolicyStrategy() {
+ @Override
+ public Iterable<Throwable> createExceptionIterable(Throwable
exception) {
+ List<Throwable> answer = new ArrayList<>();
+ // reversing default implementation order
+ for (Throwable throwable :
super.createExceptionIterable(exception)) {
+ answer.add(0, throwable);
+ }
+ return answer;
+ }
+ });
+ return answer;
+ }
+
+ /**
+ * With the default implementation throwing MyUserException is matched to
the generic Exception.class policy because
+ * of its cause. Whereas when reversing the order to check,
MyUserException is matched to its superclass
+ * IllegalStateException.class policy first
+ */
+ @Test
+ public void testReverseBehavior() throws Exception {
+ MockEndpoint mock = getMockEndpoint(ERROR_USER_QUEUE);
+ mock.expectedMessageCount(1);
+ getMockEndpoint("mock:result").expectedMessageCount(0);
+
+ try {
+ template.sendBody("direct:a", "Hello Camel");
+ fail("Should have thrown an Exception");
+ } catch (Exception e) {
+ // expected
+ }
+
+ assertMockEndpointsSatisfied();
+ }
+
+ @Override
+ protected RouteBuilder createRouteBuilder() throws Exception {
+ return new RouteBuilder() {
+ public void configure() throws Exception {
+
onException(IllegalStateException.class).maximumRedeliveries(1).redeliveryDelay(0)
+ .to(ERROR_USER_QUEUE);
+
+
onException(Exception.class).maximumRedeliveries(1).redeliveryDelay(0)
+ .to(ERROR_QUEUE);
+
+ from("direct:a").process(new Processor() {
+ public void process(Exchange exchange) throws Exception {
+ String s = exchange.getIn().getBody(String.class);
+ if ("Hello Camel".equals(s)) {
+ throw new MyUserException("Forced for testing",
new IOException("Uh oh!"));
+ }
+ exchange.getMessage().setBody("Hello World");
+ }
+ }).to("mock:result");
+ }
+ };
+ }
+}
