Package com.alu.e3.tdr.service.impl

Source Code of com.alu.e3.tdr.service.impl.TdrQueueService

/**
* Copyright © 2012 Alcatel-Lucent.
*
* See the NOTICE file distributed with this work for additional
* information regarding copyright ownership.
* Licensed 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 com.alu.e3.tdr.service.impl;

import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.atomic.AtomicInteger;

import com.alu.e3.common.performance.PerfWatch;
import com.alu.e3.tdr.service.ITdrQueueService;

public class TdrQueueService implements ITdrQueueService {

  private LinkedBlockingQueue<Map<String, List<Map<String, Object>>>> queue;

  private int queueWaitingSize = 2000; // Only default

  private static PerfWatch perfWatch;
  public PerfWatch getPerfWatch() {
    if (perfWatch == null )
      perfWatch = new PerfWatch();
   
    return perfWatch;
  }
 
  public void setQueueWaitingSize(int size) {
    this.queueWaitingSize = size;
    init();
  }

  private void init() {
    LinkedBlockingQueue<Map<String, List<Map<String, Object>>>> lastQueue = null;

    if (queue != null)
      lastQueue = queue;

    queue = new LinkedBlockingQueue<Map<String, List<Map<String, Object>>>>(
        queueWaitingSize);
    // A consumer may still have a take in progress on lastQueue
    // but at this point queue is now the queue where future lock will
    // happen

    if (lastQueue != null) {
      // Transfer queue contents
      List<Map<String, List<Map<String, Object>>>> toTransfer = new LinkedList<Map<String, List<Map<String, Object>>>>();
      // Safe drainTo, 'cause queue reference has changed

      do {
        lastQueue.drainTo(toTransfer);
        // Safe addAll, 'cause toTransfer will not be modified during
        // the call
        queue.addAll(toTransfer);
        // Notify possibly offerer
        toTransfer.clear();
        // TODO: Check the good existing of this loop, and the
        // concurrent-ness between
        // queue.addAll and putOrWait of offerers.
      } while (!lastQueue.isEmpty());

      lastQueue.clear();
    }
  }


  @Override
  public void putOrWait(Map<String, List<Map<String, Object>>> elem) throws InterruptedException {
 
    Long startTime = System.nanoTime();
     
    queue.put(elem);
   
    getPerfWatch().getElapsedTime().addAndGet(System.nanoTime()-startTime);
    getPerfWatch().getIterationCount().getAndIncrement();
    getPerfWatch().log("TdrQueueService.putOrWait()");
  }

  @Override
  public Map<String, List<Map<String, Object>>> getOrWait()
      throws InterruptedException {
    return queue.take();
   
  }

  @Override
  public int getQueueSize() {
    return queue.size();
  }

  @Override
  public List<Map<String, List<Map<String, Object>>>> getMultiple(int capacity)
      throws InterruptedException {
    List<Map<String, List<Map<String, Object>>>> dataPack = new LinkedList<Map<String, List<Map<String, Object>>>>();
    queue.drainTo(dataPack, capacity);
    return dataPack;
  }
}
TOP

Related Classes of com.alu.e3.tdr.service.impl.TdrQueueService

TOP
Copyright © 2018 www.massapi.com. All rights reserved.
All source code are property of their respective owners. Java is a trademark of Sun Microsystems, Inc and owned by ORACLE Inc. Contact coftware#gmail.com.