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 backtype.storm.testing;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.net.Socket;
  import java.util.Collection;
  import java.util.Map;
  import java.io.OutputStream;
  
  import backtype.storm.metric.api.IMetricsConsumer;
  import backtype.storm.task.IErrorReporter;
  import backtype.storm.task.TopologyContext;
  
  /*
   * Listens for all metrics, dumps them as text to a configured host:port
   *
   * To use, add this to your topology's configuration:
   *   conf.registerMetricsConsumer(backtype.storm.testing.ForwardingMetricsConsumer.class, "<HOST>:<PORT>", 1);
   *
   * Or edit the storm.yaml config file:
   *
   *   topology.metrics.consumer.register:
   *     - class: "backtype.storm.testing.ForwardingMetricsConsumer"
   *     - argument: "example.com:9999"
   *       parallelism.hint: 1
   *
   */
  public class ForwardingMetricsConsumer implements IMetricsConsumer {
      String host;
      int port;
      Socket socket;
      OutputStream out;
  
      @Override
      public void prepare(Map stormConf, Object registrationArgument, TopologyContext context, IErrorReporter errorReporter) {
          String[] parts = ((String) registrationArgument).split(":", 2);
          host = parts[0];
          port = Integer.valueOf(parts[1]);
          try {
              socket = new Socket(host, port);
              out = socket.getOutputStream();
          } catch (Exception e) {
              throw new RuntimeException(e);
          }
      }
  
      @Override
      public void handleDataPoints(TaskInfo taskInfo, Collection<DataPoint> dataPoints) {
          StringBuilder sb = new StringBuilder();
          String header =
                  taskInfo.timestamp + "\t" + taskInfo.srcWorkerHost + ":" + taskInfo.srcWorkerPort + "\t" + taskInfo.srcTaskId + "\t" + taskInfo.srcComponentId
                          + "\t";
          sb.append(header);
          for (DataPoint p : dataPoints) {
              sb.delete(header.length(), sb.length());
              sb.append(p.name).append("\t").append(p.value).append("\n");
              try {
                  out.write(sb.toString().getBytes());
                  out.flush();
              } catch (Exception e) {
                  throw new RuntimeException(e);
              }
          }
      }
  
      @Override
      public void cleanup() {
          try {
              socket.close();
          } catch (Exception e) {
              throw new RuntimeException(e);
          }
      }
  }
  