轻松学习多线程-04-Guarded Suspension 模式

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Guarded Suspension 模式

Guarded Suspension 模式通过让线程等待保证线程的安全性。

实际案例

类信息概览：

类名	说明
Main.java	方法的总入口
ClientThread.java	发送请求的类
ServerThread.java	接受请求的类
RequestQueue.java	依次存放请求的类
Request.java	标识一个请求的类

定义

• ClientThread.java

package com.github.houbb.thread.learn.easy.learn.guarded.suspension;import java.util.Random;public class ClientThread extends Thread {private final Random random;private final RequestQueue requestQueue;public ClientThread(RequestQueue requestQueue, final String name, final long seed) {super(name);this.requestQueue = requestQueue;random = new Random(seed);}@Overridepublic void run() {for(int i = 0; i < 10; i++) {Request request = new Request("No. " + i);requestQueue.putRequest(request);System.out.println(Thread.currentThread().getName() + " put " + request);try {Thread.sleep(random.nextInt(1000));} catch (InterruptedException e) {e.printStackTrace();}}}}

• ServerThread.java

package com.github.houbb.thread.learn.easy.learn.guarded.suspension;import java.util.Random;public class ServerThread extends Thread {private final Random random;private final RequestQueue requestQueue;public ServerThread(RequestQueue requestQueue, final String name, final long seed) {super(name);this.requestQueue = requestQueue;random = new Random(seed);}@Overridepublic void run() {for(int i = 0; i < 10; i++) {Request request = requestQueue.getRequest();System.out.println(Thread.currentThread().getName()+" get "+request);try {Thread.sleep(random.nextInt(1000));} catch (InterruptedException e) {e.printStackTrace();}}}}

• RequestQueue.java

package com.github.houbb.thread.learn.easy.learn.guarded.suspension;import java.util.LinkedList;
import java.util.Queue;public class RequestQueue {private Queue<Request> requestQueue = new LinkedList<>();/*** 获取一个对象* 1. 如果队列为空，则一直等待。* @return*/public synchronized Request getRequest() {while(requestQueue.peek() == null) {try {wait();} catch (InterruptedException e) {e.printStackTrace();}}// Retrieves and removes the head of this queue.return requestQueue.remove();}/*** 放置一个对象* @param request*/public synchronized void putRequest(Request request) {requestQueue.add(request);notifyAll();}}

• Request.java

package com.github.houbb.thread.learn.easy.learn.guarded.suspension;/*** 请求参数* @version 1.0.0* @author bbhou* @since 1.0.0*/
public class Request {private final String name;public Request(String name) {this.name = name;}public String getName() {return name;}@Overridepublic String toString() {return "Request{" +"name='" + name + '\'' +'}';}
}

测试

• Main.java

package com.github.houbb.thread.learn.easy.learn.guarded.suspension;public class Main {public static void main(String[] args) {RequestQueue requestQueue = new RequestQueue();new ClientThread(requestQueue, "CLIENT", 10000L).start();new ServerThread(requestQueue, "SERVER", 20000L).start();}}

• 测试结果

CLIENT put Request{name='No. 0'}
SERVER get Request{name='No. 0'}
CLIENT put Request{name='No. 1'}
SERVER get Request{name='No. 1'}
CLIENT put Request{name='No. 2'}
CLIENT put Request{name='No. 3'}
SERVER get Request{name='No. 2'}
SERVER get Request{name='No. 3'}
CLIENT put Request{name='No. 4'}
CLIENT put Request{name='No. 5'}
SERVER get Request{name='No. 4'}
CLIENT put Request{name='No. 6'}
CLIENT put Request{name='No. 7'}
SERVER get Request{name='No. 5'}
CLIENT put Request{name='No. 8'}
SERVER get Request{name='No. 6'}
CLIENT put Request{name='No. 9'}
SERVER get Request{name='No. 7'}
SERVER get Request{name='No. 8'}
SERVER get Request{name='No. 9'}

实现方式

UML & Code

UML

UML 图示如下

Code

代码地址

Guarded Suspension

系列导航

多线程系列导航

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