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Lock、Condition实现简单的生产者消费者模式示例

2019年07月22日  | 移动技术网IT编程  | 我要评论

复制代码 代码如下:

package condition;

import java.util.arraylist;
import java.util.list;
import java.util.concurrent.locks.condition;
import java.util.concurrent.locks.lock;
import java.util.concurrent.locks.reentrantlock;


/**
 * 利用lock、condition实现生产者消费者模式
 * @author will
 *
 */
public class producerconsumerdemo {

 public static void main(string[] args) {
  int producercount = 10;
  int consumercount = 15;

  final producerconsumerdemo pcd = new producerconsumerdemo(5);   // 缓冲区大小为5

  thread[] producerthreads = new thread[producercount];
  for(int i = 0; i < producercount; i++) {
   producerthreads[i] = new thread("producer" + (i+1)) {

    @override
    public void run() {
     pcd.produce();
    }
   };
  }

  thread[] consumerthreads = new thread[consumercount];
  for(int j = 0; j < consumercount; j++) {
   consumerthreads[j] = new thread("consumer" + (j+1)) {
    @override
    public void run() {
     pcd.consume();
    }
   };
  }

  // 启动生产者消费者线程
  for(int i = 0; i < producercount; i++) {
   producerthreads[i].start();
  }
  for(int j = 0; j < consumercount; j++) {
   consumerthreads[j].start();
  }
 }

 private static final int default_buffer_size = 10;
 private int buffersize;   // 缓冲区大小
 private list<object> bufferlist;

 private final lock lock = new reentrantlock(true);
 private final condition condition = lock.newcondition();

 public producerconsumerdemo(int buffersize) {
  this.buffersize = buffersize > 0 ? buffersize : default_buffer_size;
  bufferlist = new arraylist<object>(buffersize);
 }

 // 生产
 public void produce() {
  lock.lock();   // 加锁
  try {
   while(bufferlist.size() == buffersize) {   // 缓冲区满了
    system.out.println("producer wait, thread: " + thread.currentthread().getname());
    condition.await();
   }

   // 生产
   bufferlist.add(new object());
   system.out.println("producer produce one, now buffer size: "
     + bufferlist.size() + ", and thread: " + thread.currentthread().getname());
   condition.signalall();   // 通知消费者
  } catch(interruptedexception e) {
   e.printstacktrace();
  } finally {
   lock.unlock();
  }
 }

 // 消费
 public void consume() {
  lock.lock();   // 加锁
  try {
   while(bufferlist.isempty()) {   // 缓冲区空了
    system.out.println("consumer wait, thread: " + thread.currentthread().getname());
    condition.await();
   }

   // 消费
   bufferlist.remove(0);   // 从链表头部移除一个
   system.out.println("consumer consumer one, now buffer size: "
     + bufferlist.size() + ", and thread: " + thread.currentthread().getname());
   condition.signalall();
  } catch(interruptedexception e) {
   e.printstacktrace();
  } finally {
   lock.unlock();
  }
 }

}

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