com.streamsets.datacollector.flume.standalone.FlumeDestinationPipelineOperationsIT.java Source code

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Here is the source code for com.streamsets.datacollector.flume.standalone.FlumeDestinationPipelineOperationsIT.java

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/**
 * Copyright 2015 StreamSets Inc.
 *
 * Licensed under 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 com.streamsets.datacollector.flume.standalone;

import com.google.common.io.Resources;
import com.streamsets.datacollector.base.PipelineOperationsStandaloneIT;

import org.apache.flume.Channel;
import org.apache.flume.ChannelSelector;
import org.apache.flume.Context;
import org.apache.flume.Transaction;
import org.apache.flume.channel.ChannelProcessor;
import org.apache.flume.channel.MemoryChannel;
import org.apache.flume.channel.ReplicatingChannelSelector;
import org.apache.flume.conf.Configurables;
import org.apache.flume.source.AvroSource;
import org.junit.AfterClass;
import org.junit.BeforeClass;

import java.net.URI;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class FlumeDestinationPipelineOperationsIT extends PipelineOperationsStandaloneIT {

    private static AvroSource source;
    private static Channel ch;
    private static ExecutorService executorService;

    @BeforeClass
    public static void beforeClass() throws Exception {
        //setup flume to write to
        source = new AvroSource();
        ch = new MemoryChannel();
        Configurables.configure(ch, new Context());

        Context context = new Context();
        //This should match whats present in the pipeline.json file
        context.put("port", String.valueOf(9050));
        context.put("bind", "localhost");
        Configurables.configure(source, context);

        List<Channel> channels = new ArrayList<>();
        channels.add(ch);
        ChannelSelector rcs = new ReplicatingChannelSelector();
        rcs.setChannels(channels);
        source.setChannelProcessor(new ChannelProcessor(rcs));
        source.start();
        PipelineOperationsStandaloneIT.beforeClass(getPipelineJson());

        //read from flume memory channel every second, otherwise the channel fills up and there is no more data coming in
        executorService = Executors.newSingleThreadExecutor();
        executorService.submit(new Runnable() {
            @Override
            public void run() {
                Transaction transaction;
                while (true) {
                    transaction = ch.getTransaction();
                    transaction.begin();
                    ch.take();
                    transaction.commit();
                    transaction.close();
                }
            }
        });
    }

    @AfterClass
    public static void afterClass() throws Exception {
        executorService.shutdownNow();
        source.stop();
        ch.stop();
        PipelineOperationsStandaloneIT.afterClass();
    }

    private static String getPipelineJson() throws Exception {
        URI uri = Resources.getResource("flume_destination_pipeline_operations.json").toURI();
        String pipelineJson = new String(Files.readAllBytes(Paths.get(uri)), StandardCharsets.UTF_8);
        return pipelineJson;
    }

    @Override
    protected String getPipelineName() {
        return "flume_destination_pipeline";
    }

    @Override
    protected String getPipelineRev() {
        return "0";
    }

    @Override
    protected void postPipelineStart() {

    }

}