JAVA线程锁lock下Condition高级使用-多个Condition的整合使用

import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

/**
 * 利用多个Condition来实现一个可阻塞的缓冲区
 * @author duwenlei
 *
 */
public class BoundedBuffer {

    private final Lock lock = new ReentrantLock();
    private final Condition notFull = lock.newCondition();
    private final Condition notEmpty = lock.newCondition();

    final Object[] items = new Object[100];
    int putptr,takeptr,count;

    public void put(Object x) throws InterruptedException{
        lock.lock();
        try {
            while (count == items.length) {
                notFull.await();    //已经满了，等待
            }
            items[putptr] = x;
            if (++putptr == items.length) putptr = 0;
            ++count;
            notEmpty.signal();//可以取了
        }finally{
            lock.unlock();
        }
    }
    public Object take() throws InterruptedException{
        Object obj = null;
        lock.lock();
        try {
            while(count == 0){
                notEmpty.await();    //已经空了，等待
            }
            obj = items[takeptr];
            if(++takeptr == items.length) takeptr=0;
            --count;
            notFull.signal();
            return obj;
        }finally{
            lock.unlock();
        }
    }
}