BlockingQueue

package com.ctrip.ctripimapp.listener;

import com.ctrip.ctripimapp.presenter.LoginPresenter;

import org.jivesoftware.smack.packet.Message;

import java.util.concurrent.ArrayBlockingQueue;

/**
 * Created by zhangoceansoft on 16/4/27.
 */
public class BlockingQueue extends ArrayBlockingQueue<Message> {

    /**
     * 定义队列缓冲池最大消息数，如果达到该值，那么队列检入将等待检出低于该值时继续进行。
     */
    private static Integer offerMaxQueue = 2000;

    private static BlockingQueue instance ;

    private static int capacity ;

    private BlockingQueue(int capacity) {
        super(capacity);
        BlockingQueue.capacity=capacity;
    }

    /**
     * 向外界程序提供的唯一的方法，访问阻塞队列。
     * @return 返回唯一的阻塞队列对象
     */
    public static BlockingQueue getInstance() {
        if (instance == null) {
            synchronized (BlockingQueue.class) {
                if (instance == null) {
                    instance = new BlockingQueue(offerMaxQueue);
                }
            }
        }
        return instance;
    }
}