camel-2.8.x/components/camel-ftp/src/test/java/org/apache/camel/component/file/remote/FromFtpSimulateNetworkIssueRecoverTest.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.remote;

import org.apache.camel.Consumer;
import org.apache.camel.Endpoint;
import org.apache.camel.builder.RouteBuilder;
import org.apache.camel.component.mock.MockEndpoint;
import org.apache.camel.impl.JndiRegistry;
import org.junit.Test;

/**
 * Simulate network issues by using a custom poll strategy to force exceptions
 * occurring during poll.
 *
 * @version 
 */
public class FromFtpSimulateNetworkIssueRecoverTest extends FtpServerTestSupport {

    private static int counter;
    private static int rollback;

    private String getFtpUrl() {
        return "ftp://admin@localhost:" + getPort() + "/recover?password=admin&pollStrategy=#myPoll";
    }

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

    @Test
    public void testFtpRecover() throws Exception {
        // should be able to download the file after recovering
        MockEndpoint resultEndpoint = getMockEndpoint("mock:result");
        resultEndpoint.expectedMinimumMessageCount(3);

        template.sendBody(getFtpUrl(), "Hello World");

        resultEndpoint.assertIsSatisfied();

        Thread.sleep(2000);

        assertTrue("Should have tried at least 3 times was " + counter, counter >= 3);
        assertEquals(2, rollback);
    }

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

    public class MyPollStrategy extends RemoteFilePollingConsumerPollStrategy {

        @Override
        public void commit(Consumer consumer, Endpoint endpoint, int polledMessages) {
            counter++;
            if (counter < 3) {
                throw new IllegalArgumentException("Forced by unit test");
            }
        }

        @Override
        public boolean rollback(Consumer consumer, Endpoint endpoint, int retryCounter, Exception e) throws Exception {
            rollback++;
            return super.rollback(consumer, endpoint, retryCounter, e);
        }
    }
}