FlumeDestinationPipelineOperationsIT.java

/**
 * 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() {

  }

}