FileConsumerFailureHandledTest.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 java.io.File;

import org.apache.camel.ContextTestSupport;
import org.apache.camel.Exchange;
import org.apache.camel.Processor;
import org.apache.camel.RuntimeCamelException;
import org.apache.camel.ValidationException;
import org.apache.camel.builder.RouteBuilder;
import org.apache.camel.component.mock.MockEndpoint;

/**
 * Unit test for consuming files but the exchange fails and is handled
 * by the failure handler (usually the DeadLetterChannel)
 */
public class FileConsumerFailureHandledTest extends ContextTestSupport {

    @Override
    protected void setUp() throws Exception {
        deleteDirectory("target/messages/input");
        super.setUp();
    }

    public void testParis() throws Exception {
        MockEndpoint mock = getMockEndpoint("mock:valid");
        mock.expectedBodiesReceived("Hello Paris");

        template.sendBodyAndHeader("file:target/messages/input/", "Paris", Exchange.FILE_NAME, "paris.txt");
        mock.assertIsSatisfied();

        oneExchangeDone.matchesMockWaitTime();

        assertFiles("paris.txt", true);
    }

    public void testLondon() throws Exception {
        MockEndpoint mock = getMockEndpoint("mock:invalid");
        // we get the original input so its not Hello London but only London
        mock.expectedBodiesReceived("London");

        template.sendBodyAndHeader("file:target/messages/input/", "London", Exchange.FILE_NAME, "london.txt");
        mock.assertIsSatisfied();

        oneExchangeDone.matchesMockWaitTime();

        // london should be deleted as we have failure handled it
        assertFiles("london.txt", true);
    }
    
    public void testDublin() throws Exception {
        MockEndpoint mock = getMockEndpoint("mock:beer");
        // we get the original input so its not Hello London but only London
        mock.expectedBodiesReceived("Dublin");

        template.sendBodyAndHeader("file:target/messages/input/", "Dublin", Exchange.FILE_NAME, "dublin.txt");
        mock.assertIsSatisfied();

        oneExchangeDone.matchesMockWaitTime();

        // dublin should NOT be deleted, but should be retired on next consumer
        assertFiles("dublin.txt", false);
    }

    public void testMadrid() throws Exception {
        MockEndpoint mock = getMockEndpoint("mock:error");
        // we get the original input so its not Hello London but only London
        mock.expectedBodiesReceived("Madrid");

        template.sendBodyAndHeader("file:target/messages/input/", "Madrid", Exchange.FILE_NAME, "madrid.txt");
        mock.assertIsSatisfied();

        oneExchangeDone.matchesMockWaitTime();

        // madrid should be deleted as the DLC handles it
        assertFiles("madrid.txt", true);
    }

    private static void assertFiles(String filename, boolean deleted) throws InterruptedException {
        // file should be deleted as delete=true in parameter in the route below
        File file = new File("target/messages/input/" + filename);
        assertEquals("File " + filename + " should be deleted: " + deleted, deleted, !file.exists());

        // and no lock files
        String lock = filename + FileComponent.DEFAULT_LOCK_FILE_POSTFIX;
        file = new File("target/messages/input/" + lock);
        assertFalse("File " + lock + " should be deleted", file.exists());
    }

    protected RouteBuilder createRouteBuilder() throws Exception {
        return new RouteBuilder() {
            public void configure() throws Exception {
                // make sure mock:error is the dead letter channel
                // use no delay for fast unit testing
                errorHandler(deadLetterChannel("mock:error").maximumRedeliveries(2).redeliveryDelay(0).logStackTrace(false));

                // special for not handled when we got beer
                onException(ValidationException.class).onWhen(exceptionMessage().contains("beer"))
                    .handled(false).to("mock:beer");

                // special failure handler for ValidationException
                onException(ValidationException.class).handled(true).to("mock:invalid");

                // our route logic to process files from the input folder
                from("file:target/messages/input/?delete=true").
                    process(new MyValidatorProcessor()).
                    to("mock:valid");
            }
        };
    }

    private static class MyValidatorProcessor implements Processor {
        public void process(Exchange exchange) throws Exception {
            String body = exchange.getIn().getBody(String.class);
            if ("London".equals(body)) {
                throw new ValidationException(exchange, "Forced exception by unit test");
            } else if ("Madrid".equals(body)) {
                throw new RuntimeCamelException("Madrid is not a supported city");
            } else if ("Dublin".equals(body)) {
                throw new ValidationException(exchange, "Dublin have good beer");
            }
            exchange.getOut().setBody("Hello " + body);
        }
    }
    
}