/*
    * 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.hadoop.chukwa.datacollection.writer;
  
  
  import java.util.List;
  import java.util.Timer;
  import java.util.TimerTask;
  import org.apache.hadoop.chukwa.Chunk;
  import org.apache.hadoop.conf.Configuration;
  
  public class ConsoleWriter implements ChukwaWriter {
  
    boolean printData;
    volatile long dataSize = 0;
    final Timer statTimer;
  
    private class StatReportingTask extends TimerTask {
      private long lastTs = System.currentTimeMillis();
      private long lastDataSize = 0;
  
      public void run() {
        long time = System.currentTimeMillis();
        long interval = time - lastTs;
        lastTs = time;
  
        long ds = dataSize;
        long dataRate = 1000 * (ds - lastDataSize) / interval; // bytes/sec
        // refers only to data field, not including http or chukwa headers
        lastDataSize = ds;
  
        System.out.println("stat=datacollection.writer.ConsoleWriter|dataRate="
            + dataRate);
      }
    };
  
    public ConsoleWriter() {
      this(true);
    }
  
    public ConsoleWriter(boolean printData) {
      this.printData = printData;
      statTimer = new Timer();
    }
  
    public void close() {
      statTimer.cancel();
    }
  
    public void init(Configuration conf) throws WriterException {
      System.out.println("----  DUMMY HDFS WRITER IN USE ---");
  
      statTimer.schedule(new StatReportingTask(), 1000, 10 * 1000);
    }
  
    public void add(Chunk data) throws WriterException {
      int startOffset = 0;
  
      dataSize += data.getData().length;
      if (printData) {
        System.out.println(data.getData().length + " bytes of data in chunk");
  
        for (int offset : data.getRecordOffsets()) {
          System.out.print(data.getStreamName());
          System.out.print(" ");
          System.out.print(data.getSource());
          System.out.print(" ");
          System.out.print(data.getDataType());
          System.out.print(") ");
          System.out.print(new String(data.getData(), startOffset, offset
              - startOffset + 1));
          startOffset = offset + 1;
        }
      }
    }
  
    @Override
    public CommitStatus add(List<Chunk> chunks) throws WriterException {
      for (Chunk chunk : chunks) {
        add(chunk);
      }
      return COMMIT_OK;
    }
 
 }