用java實現的生產者與消費者多線程同步互斥模型

生產者與消費者模型中，要保證以下幾點：
 （1）同一時間內只能有一個生產者生產。
 （2）同一時間內只能有一個消費者消費。
 （3）生產者生產的同時消費者不能消費。
 （4）訊息佇列滿時生產者不能繼續生產，訊息佇列空時消費者不能繼續消費，此時必須等待。

代碼：

1、Message.java

package com.test;</p><p>/**<br /> * 訊息對象<br /> *<br /> */<br />public class Message {</p><p>private int id;<br />private String message;<br />public int getId() {<br />return id;<br />}<br />public void setId(int id) {<br />this.id = id;<br />}<br />public String getMessage() {<br />return message;<br />}<br />public void setMessage(String message) {<br />this.message = message;<br />}</p><p>}<br />

2、Queue.java

 package com.test;</p><p>import java.util.ArrayList;<br />import java.util.List;<br />/**<br /> * 存放訊息的緩衝隊列,共用資源<br /> *<br /> */<br />public class Queue {</p><p>private List<Message> list = new ArrayList<Message>();</p><p>private int maxCount = 5;</p><p>/**<br /> * 生產<br /> * @param message<br /> */<br />public synchronized void product(Message message){</p><p>this.notifyAll();<br />while (maxCount == getList().size()) {<br />System.out.println(Thread.currentThread().getName()+"，隊列已滿，等待中。。。。");<br />try {<br />this.wait();<br />} catch (InterruptedException e) {<br />e.printStackTrace();<br />}<br />}<br />getList().add(message);<br />System.out.println(Thread.currentThread().getName()+",正在生產。。。隊列當前個數:"+getList().size());<br />}</p><p>/**<br /> * 消費<br /> */<br />public synchronized void consume(){<br />this.notifyAll();<br />while(getList().size()==0){<br />System.out.println(Thread.currentThread().getName()+"，隊列為空白，等待中。。。");<br />try {<br />this.wait();<br />} catch (InterruptedException e) {<br />e.printStackTrace();<br />}<br />}<br />Message message = getList().get(0);<br />getList().remove(message);<br />System.out.println(Thread.currentThread().getName()+",正在消費。。。隊列當前個數:"+getList().size());</p><p>}</p><p>public List<Message> getList() {<br />return list;<br />}</p><p>public void setList(List<Message> list) {<br />this.list = list;<br />}</p><p>public int getMaxCount() {<br />return maxCount;<br />}</p><p>public void setMaxCount(int maxCount) {<br />this.maxCount = maxCount;<br />}<br />}<br />

3、Producer.java

package com.test;</p><p>import java.util.Random;</p><p>/**<br /> * 生產者生產<br /> *<br /> */<br />public class Producer implements Runnable {</p><p>private Queue queue = null;</p><p>public Producer(Queue queue) {<br />this.queue = queue;<br />}</p><p>public void run() {<br />while (true) {<br />Message message = new Message();<br />message.setId(new Random().nextInt());<br />message.setMessage("message," + new Random().nextInt());<br />queue.product(message);<br />try {<br />Thread.sleep(100);<br />} catch (InterruptedException e) {<br />e.printStackTrace();<br />}<br />}</p><p>}</p><p>}<br />

4、Consumer .java

package com.test;</p><p>/**<br /> * 消費者消費<br /> *<br /> */<br />public class Consumer implements Runnable {</p><p>private Queue queue;</p><p>public Consumer(Queue queue) {<br />this.queue = queue;<br />}</p><p>public void run() {</p><p>while (true) {<br />queue.consume();<br />try {<br />Thread.sleep(100);<br />} catch (InterruptedException e) {<br />e.printStackTrace();<br />}<br />}</p><p>}<br />}<br />

5、Test.java

package com.test;</p><p>public class Test {</p><p>public static void main(String[] args) {<br />Queue queue = new Queue();<br />//生產者兩個<br />Producer producer1 = new Producer(queue);<br />Producer producer2 = new Producer(queue);</p><p>// 消費者三個<br />Consumer consumer1 = new Consumer(queue);<br />Consumer consumer2 = new Consumer(queue);<br />Consumer consumer3 = new Consumer(queue);</p><p>Thread thread1 = new Thread(producer1,"producer1");<br />Thread thread2 = new Thread(producer2,"producer2");<br />Thread thread3 = new Thread(consumer1,"consumer1");<br />Thread thread4 = new Thread(consumer2,"consumer2");<br />Thread thread5 = new Thread(consumer3,"consumer3");<br />thread1.start();<br />thread2.start();<br />thread3.start();<br />thread4.start();<br />thread5.start();</p><p>}<br />}<br />