| /** |
| * 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; |
| |
| import java.io.IOException; |
| |
| 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; |
| |
| /** |
| * Unit test for testing possibility to modify exchange before redelivering specific |
| * per on exception |
| */ |
| public class DeadLetterChannelOnExceptionOnRedeliveryTest extends ContextTestSupport { |
| |
| static int counter; |
| |
| public void testGlobalOnRedelivery() throws Exception { |
| MockEndpoint mock = getMockEndpoint("mock:result"); |
| mock.expectedBodiesReceived("Hello World3"); |
| |
| template.sendBody("direct:start", "Hello World"); |
| |
| assertMockEndpointsSatisfied(); |
| } |
| |
| public void testRouteSpecificOnRedelivery() throws Exception { |
| MockEndpoint mock = getMockEndpoint("mock:result"); |
| mock.expectedBodiesReceived("Hello World"); |
| mock.message(0).header("Timeout").isEqualTo(5000); |
| |
| template.sendBody("direct:io", "Hello World"); |
| |
| assertMockEndpointsSatisfied(); |
| } |
| |
| @Override |
| protected void setUp() throws Exception { |
| super.setUp(); |
| counter = 0; |
| } |
| |
| @Override |
| protected RouteBuilder createRouteBuilder() throws Exception { |
| return new RouteBuilder() { |
| @Override |
| public void configure() throws Exception { |
| // START SNIPPET: e1 |
| // when we redeliver caused by an IOException we want to do some special |
| // code before the redeliver attempt |
| onException(IOException.class) |
| // try to redeliver at most 3 times |
| .maximumRedeliveries(3) |
| .onRedelivery(new MyIORedeliverProcessor()); |
| // END SNIPPET: e1 |
| |
| // START SNIPPET: e2 |
| // we configure our Dead Letter Channel to invoke |
| // MyRedeliveryProcessor before a redelivery is |
| // attempted. This allows us to alter the message before |
| errorHandler(deadLetterChannel("mock:error").maximumRedeliveries(5) |
| .onRedelivery(new MyRedeliverProcessor()) |
| // setting delay to zero is just to make unit testing faster |
| .redeliveryDelay(0L)); |
| // END SNIPPET: e2 |
| |
| |
| from("direct:start").process(new ThrowExceptionProcessor()).to("mock:result"); |
| |
| from("direct:io").process(new ThrowIOExceptionProcessor()).to("mock:result"); |
| } |
| }; |
| } |
| |
| // START SNIPPET: e3 |
| // This is our processor that is executed before every redelivery attempt |
| // here we can do what we want in the java code, such as altering the message |
| public static class MyRedeliverProcessor implements Processor { |
| |
| public void process(Exchange exchange) throws Exception { |
| // the message is being redelivered so we can alter it |
| |
| // we just append the redelivery counter to the body |
| // you can of course do all kind of stuff instead |
| String body = exchange.getIn().getBody(String.class); |
| int count = exchange.getIn().getHeader("CamelRedeliveryCounter", Integer.class); |
| |
| exchange.getIn().setBody(body + count); |
| } |
| } |
| // END SNIPPET: e3 |
| |
| // START SNIPPET: e4 |
| // This is our processor that is executed before IOException redeliver attempt |
| // here we can do what we want in the java code, such as altering the message |
| |
| public static class MyIORedeliverProcessor implements Processor { |
| |
| public void process(Exchange exchange) throws Exception { |
| // just for show and tell, here we set a special header to instruct |
| // the receive a given timeout value |
| exchange.getIn().setHeader("Timeout", 5000); |
| } |
| } |
| // END SNIPPET: e4 |
| |
| public static class ThrowExceptionProcessor implements Processor { |
| |
| public void process(Exchange exchange) throws Exception { |
| // force some error so Camel will do redelivery |
| if (++counter <= 3) { |
| throw new IllegalArgumentException("Forced by unit test"); |
| } |
| |
| } |
| } |
| |
| public static class ThrowIOExceptionProcessor implements Processor { |
| |
| public void process(Exchange exchange) throws Exception { |
| // force some error so Camel will do redelivery |
| if (++counter <= 3) { |
| throw new IOException("Cannot connect"); |
| } |
| |
| } |
| } |
| |
| |
| } |