/**
* 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 World123");
template.sendBody("direct:start", "Hello World");
assertMockEndpointsSatisfied();
}
public void testOnExceptionAlterMessageWithHeadersBeforeRedelivery() throws Exception {
MockEndpoint mock = getMockEndpoint("mock:result");
mock.expectedBodiesReceived("Hello World123");
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")
.onRedelivery(new MyRedeliverPrcessor())
// setting delay to zero is just to make unit teting faster
.initialRedeliveryDelay(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 MyRedeliverPrcessor 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("org.apache.camel.RedeliveryCounter", Integer.class);
exchange.getIn().setBody(body + count);
}
}
// END SNIPPET: e2
}