WaitingQueue.java

/*
 * 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();
  }

}