| /** |
| * 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 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 |
| */ |
| public class DeadLetterChannelOnRedeliveryTest extends ContextTestSupport { |
| |
| static int counter; |
| |
| public void testOnExceptionAlterMessageBeforeRedelivery() throws Exception { |
| MockEndpoint mock = getMockEndpoint("mock:result"); |
| mock.expectedBodiesReceived("Hello World3"); |
| |
| template.sendBody("direct:start", "Hello World"); |
| |
| assertMockEndpointsSatisfied(); |
| } |
| |
| public void testOnExceptionAlterMessageWithHeadersBeforeRedelivery() throws Exception { |
| MockEndpoint mock = getMockEndpoint("mock:result"); |
| mock.expectedBodiesReceived("Hello World3"); |
| mock.expectedHeaderReceived("foo", "123"); |
| |
| template.sendBodyAndHeader("direct:start", "Hello World", "foo", "123"); |
| |
| 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 |
| // 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: e1 |
| |
| |
| from("direct:start").process(new 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"); |
| } |
| } |
| }).to("mock:result"); |
| |
| } |
| }; |
| } |
| |
| // START SNIPPET: e2 |
| // 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 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(Exchange.REDELIVERY_COUNTER, Integer.class); |
| |
| exchange.getIn().setBody(body + count); |
| |
| // the maximum redelivery was set to 5 |
| int max = exchange.getIn().getHeader(Exchange.REDELIVERY_MAX_COUNTER, Integer.class); |
| assertEquals(5, max); |
| } |
| } |
| // END SNIPPET: e2 |
| |
| |
| } |