/*
    * 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.agent;
  
  
  import java.util.List;
  import java.util.concurrent.BlockingQueue;
  import java.util.concurrent.LinkedBlockingQueue;
  import org.apache.hadoop.chukwa.Chunk;
  import org.apache.hadoop.chukwa.datacollection.ChunkQueue;
  import org.apache.log4j.Logger;
  
  public class WaitingQueue implements ChunkQueue {
  
    static Logger log = Logger.getLogger(WaitingQueue.class);
    private BlockingQueue<Chunk> queue = new LinkedBlockingQueue<Chunk>(5);
  
    public void add(Chunk event) {
      try {
        this.queue.put(event);
      } catch (InterruptedException e) {
      }// return upwards
    }
  
    public void add(List<Chunk> events) {
      this.queue.addAll(events);
  
    }
  
    public void collect(List<Chunk> events, int maxCount) {
      // Workaround to block on the queue
      try {
        events.add(this.queue.take());
      } catch (InterruptedException e) {
      }
      this.queue.drainTo(events, maxCount - 1);
  
      System.out.println("collect [" + Thread.currentThread().getName() + "] ["
          + events.size() + "]");
  
      if (log.isDebugEnabled()) {
        log.debug("WaitingQueue.inQueueCount:" + queue.size()
            + "\tWaitingQueue.collectCount:" + events.size());
      }
    }
  
    public int size() {
      return queue.size();
    }
  
  }