camel-2.8.x/camel-core/src/test/java/org/apache/camel/component/file/FileConsumerPollStrategyRollbackThrowExceptionTest.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.component.file;

import org.apache.camel.Consumer;
import org.apache.camel.ContextTestSupport;
import org.apache.camel.Endpoint;
import org.apache.camel.Exchange;
import org.apache.camel.builder.RouteBuilder;
import org.apache.camel.impl.JndiRegistry;
import org.apache.camel.spi.PollingConsumerPollStrategy;

/**
 * Unit test for poll strategy
 */
public class FileConsumerPollStrategyRollbackThrowExceptionTest extends ContextTestSupport {

    private static volatile String event = "";

    private String fileUrl = "file://target/pollstrategy/?pollStrategy=#myPoll&initialDelay=0&delay=10";

    @Override
    protected JndiRegistry createRegistry() throws Exception {
        JndiRegistry jndi = super.createRegistry();
        jndi.bind("myPoll", new MyPollStrategy());
        return jndi;
    }

    @Override
    protected void setUp() throws Exception {
        super.setUp();
        deleteDirectory("target/pollstrategy");
        template.sendBodyAndHeader("file:target/pollstrategy/", "Hello World", Exchange.FILE_NAME, "hello.txt");
    }

    public void testRollbackThrowException() throws Exception {
        // let it run for a little, but it fails all the time
        Thread.sleep(20);

        // and we should rollback X number of times
        assertTrue(event.startsWith("rollback"));
    }

    protected RouteBuilder createRouteBuilder() throws Exception {
        return new RouteBuilder() {
            public void configure() throws Exception {
                from(fileUrl).convertBodyTo(String.class).to("mock:result");
            }
        };
    }

    private class MyPollStrategy implements PollingConsumerPollStrategy {

        public boolean begin(Consumer consumer, Endpoint endpoint) {
            // simulate an error on first poll
            throw new IllegalArgumentException("Damn I cannot do this");
        }

        public void commit(Consumer consumer, Endpoint endpoint, int polledMessages) {
            event += "commit";
        }

        public boolean rollback(Consumer consumer, Endpoint endpoint, int retryCounter, Exception cause) throws Exception {
            event += "rollback";
            throw cause;
        }
    }

}