FtpPollEnrichBridgeErrorHandlerTest.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
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package org.apache.camel.component.file.remote;

import org.apache.camel.Exchange;
import org.apache.camel.RoutesBuilder;
import org.apache.camel.builder.RouteBuilder;
import org.apache.camel.processor.aggregate.AggregationStrategy;
import org.junit.Test;

import static org.apache.camel.util.ExchangeHelper.copyResultsPreservePattern;

public class FtpPollEnrichBridgeErrorHandlerTest extends BaseServerTestSupport {

    // we want to poll enrich from FTP and therefore want to fail fast if something is wrong
    // and then bridge that error to the Camel routing error handler
    // so we need to turn of reconnection attempts
    // and turn of auto create as that will pre-login to check if the directory exists
    // and in case of connection error then throw that as an exception
    private String uri = "ftp://admin@localhost:" + getPort() + "/unknown/?password=admin"
            + "&maximumReconnectAttempts=0&autoCreate=false&throwExceptionOnConnectFailed=true&consumer.bridgeErrorHandler=true";

    @Test
    public void testPollEnrich() throws Exception {
        getMockEndpoint("mock:result").expectedMessageCount(0);
        getMockEndpoint("mock:dead").expectedMessageCount(1);

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

        assertMockEndpointsSatisfied();

        Exchange out = getMockEndpoint("mock:dead").getExchanges().get(0);
        assertNotNull(out);

        Exception caught = out.getProperty(Exchange.EXCEPTION_CAUGHT, Exception.class);
        assertNotNull("Should store caught exception", caught);
    }

    @Override
    protected RoutesBuilder createRouteBuilder() throws Exception {
        return new RouteBuilder() {
            @Override
            public void configure() throws Exception {
                errorHandler(deadLetterChannel("mock:dead"));

                from("seda:start")
                    // the FTP server is not running and therefore we should get an exception
                    // and use 60s timeout
                    // and turn on aggregation on exception as we have turned on bridge error handler,
                    // so we want to run out custom aggregation strategy for exceptions as well
                    .pollEnrich(uri, 60000, new MyAggregationStrategy(), true)
                    .to("mock:result");
            }
        };
    }

    private class MyAggregationStrategy implements AggregationStrategy {

        @Override
        public Exchange aggregate(Exchange oldExchange, Exchange newExchange) {
            if (newExchange != null) {
                copyResultsPreservePattern(oldExchange, newExchange);
            } else {
                // if no newExchange then there was no message from the external resource
                // and therefore we should set an empty body to indicate this fact
                // but keep headers/attachments as we want to propagate those
                oldExchange.getIn().setBody(null);
                oldExchange.setOut(null);
            }
            // in case of exception we are bridged then we want to perform redeliveries etc.
            // so we need to turn of exhausted redelivery
            oldExchange.removeProperties(Exchange.REDELIVERY_EXHAUSTED);
            return oldExchange;
        }
    }
}