camel-core/src/test/java/org/apache/camel/processor/RedeliverToSubRouteTest.java

/**
 * 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;

/**
 *
 */
public class RedeliverToSubRouteTest extends ContextTestSupport {

    public void testRedeliverToSubRoute() throws Exception {
        getMockEndpoint("mock:a").expectedBodiesReceived("Hello World");
        getMockEndpoint("mock:b").expectedBodiesReceived("Hello World", "Hello World", "Hello World");
        getMockEndpoint("mock:c").expectedBodiesReceived("Bye World");

        template.sendBody("direct:start", "Hello World");

        assertMockEndpointsSatisfied();
    }

    @Override
    protected RouteBuilder createRouteBuilder() throws Exception {
        return new RouteBuilder() {
            @Override
            public void configure() throws Exception {
                // START SNIPPET: e1

                // in case of io exception then try to redeliver up till 2 times
                // (do not use any delay due faster unit testing)
                onException(IOException.class)
                    .maximumRedeliveries(2).redeliveryDelay(0);

                from("direct:start")
                    .to("mock:a")
                    // call sub route (using direct)
                    .to("direct:sub")
                    .to("mock:c");

                from("direct:sub")
                    // disable error handler, so the entire route can be retried in case of redelivery
                    .errorHandler(noErrorHandler())
                    .to("mock:b")
                    .process(new MyProcessor());
                // END SNIPPET: e1
            }
        };
    }

    // START SNIPPET: e2
    public static class MyProcessor implements Processor {

        private int counter;

        @Override
        public void process(Exchange exchange) throws Exception {
            // use a processor to simulate error in the first 2 calls
            if (counter++ < 2) {
                throw new IOException("Forced");
            }
            exchange.getIn().setBody("Bye World");
        }
    }
    // END SNIPPET: e2
}