java生产者消费者

来源：互联网发布：材料数据库编辑：程序博客网时间：2024/05/16 22:30
写了一个生产者消费者模式，但好像有数据不一致的问题，先记录下：
package com.itrip.rp.openapi;import java.util.ArrayList;import java.util.List;import java.util.concurrent.ExecutorService;import java.util.concurrent.Executors;public class MyTest {        public static void main(String[] args) {    MessageQueue queue = new MessageQueue();    for(int i = 0; i<100; i++){    Producer producer = new Producer(queue);    Thread tProducer = new Thread(producer);    tProducer.start();    } Consumer c = new Consumer(queue); Thread tComsumer = new Thread(c); tComsumer.start();    }}class Message{int mId;String text;public Message(int id) {this.mId = id;}@Overridepublic String toString() {return "Message [mId=" + mId + ", text=" + text + "]";}}class MessageQueue{int index = 0;final int  MAX_INDEX = 50;//消息的最大数public List<Message> messages = new ArrayList<Message>();    //生产消息    public synchronized void push(Message m){        while(getIndex()>MAX_INDEX){              try {                  this.wait();            } catch (InterruptedException e) {                  e.printStackTrace();              }          }          this.notifyAll();        messages.add(m);         setAddIndex();      }    /**     * 消费消息     * @return     */    public synchronized Message pop(){          while(getIndex()==0){            try {                  this.wait();              } catch (InterruptedException e) {                  e.printStackTrace();              }          }          this.notifyAll();        setSubIndex();        return messages.get(getIndex());    }        public synchronized int getIndex(){    return index;    }    public synchronized void setSubIndex(){    this.index --;    }    public synchronized void setAddIndex(){    this.index ++;    }}/** *  生产消息类 * @author cheng * */class Producer implements Runnable{  MessageQueue mq = null;    Producer(MessageQueue ms){        this.mq = ms;    }  @Override    public void run() {    Message m = new Message(mq.getIndex() +1);    mq.push(m);        System.out.println("生产了id:"+m.mId+"消息");        try {            Thread.sleep(10);      } catch (InterruptedException e) {            e.printStackTrace();        }   }}/** * 消费消息类 * @author cheng * */class Consumer implements Runnable{  MessageQueue mq = null;    public Consumer(MessageQueue ms) {        this.mq = ms;    }    @Override    public void run() {  //当队列里还有消息，则启动新的线程池  while (mq.getIndex() >0) {  ExecutorService fixedThreadPool = Executors.newFixedThreadPool(5);  for(int i = 0; i<5; i++){  if(mq.getIndex() >0){  fixedThreadPool.execute(new Runnable() {@Overridepublic void run() {      Message m = mq.pop();          System.out.println("消费了消息:"+m);            try {                Thread.sleep(1000);           } catch (InterruptedException e) {                e.printStackTrace();            }}});  }else{  break;  }    }  fixedThreadPool.shutdown();  while(true){            if (fixedThreadPool.isTerminated()) {                 System.out.println("统一进行DB操作");                 break;             }  }  } }}
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