content: /**
   * 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.apex.examples.mrmonitor;
  
  import java.net.URI;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import org.apache.apex.malhar.lib.io.PubSubWebSocketInputOperator;
  import org.apache.apex.malhar.lib.io.PubSubWebSocketOutputOperator;
  import org.apache.apex.malhar.lib.utils.PubSubHelper;
  import org.apache.hadoop.conf.Configuration;
  
  import com.datatorrent.api.DAG;
  import com.datatorrent.api.StreamingApplication;
  import com.datatorrent.api.annotation.ApplicationAnnotation;
  
  /**
   * <p>
   * MRDebuggerApplication class.
   * </p>
   *
   * @since 0.3.4
   */
  @ApplicationAnnotation(name = "MRMonitoringExample")
  public class MRMonitoringApplication implements StreamingApplication
  {
  
    private static final Logger logger = LoggerFactory.getLogger(MRMonitoringApplication.class);
  
    @Override
    public void populateDAG(DAG dag, Configuration conf)
    {
      MRJobStatusOperator mrJobOperator = dag.addOperator("JobMonitor", new MRJobStatusOperator());
      URI uri = PubSubHelper.getURI(dag);
  
      PubSubWebSocketInputOperator wsIn = dag.addOperator("Query", new PubSubWebSocketInputOperator());
      wsIn.setUri(uri);
  
      MapToMRObjectOperator queryConverter = dag.addOperator("QueryConverter", new MapToMRObjectOperator());
  
      /**
       * This is used to emit the meta data about the job
       */
      PubSubWebSocketOutputOperator<Object> wsOut = dag.addOperator("JobOutput", new PubSubWebSocketOutputOperator<Object>());
      wsOut.setUri(uri);
  
      /**
       * This is used to emit the information of map tasks of the job
       */
      PubSubWebSocketOutputOperator<Object> wsMapOut = dag.addOperator("MapJob", new PubSubWebSocketOutputOperator<Object>());
      wsMapOut.setUri(uri);
  
      /**
       * This is used to emit the information of reduce tasks of the job
       */
      PubSubWebSocketOutputOperator<Object> wsReduceOut = dag.addOperator("ReduceJob", new PubSubWebSocketOutputOperator<Object>());
      wsReduceOut.setUri(uri);
  
      /**
       * This is used to emit the metric information of the job
       */
      PubSubWebSocketOutputOperator<Object> wsCounterOut = dag.addOperator("JobCounter", new PubSubWebSocketOutputOperator<Object>());
      wsCounterOut.setUri(uri);
  
      dag.addStream("QueryConversion", wsIn.outputPort, queryConverter.input);
      dag.addStream("QueryProcessing", queryConverter.output, mrJobOperator.input);
      dag.addStream("JobData", mrJobOperator.output, wsOut.input);
      dag.addStream("MapData", mrJobOperator.mapOutput, wsMapOut.input);
      dag.addStream("ReduceData", mrJobOperator.reduceOutput, wsReduceOut.input);
      dag.addStream("CounterData", mrJobOperator.counterOutput, wsCounterOut.input);
    }
  
  }
  