发布者订阅者模式之JAVA实现

 

 

 

 

1.发布者接口

package com.shoshana.publishsubscribe;

public interface IPublisher<M> {
    public void publish(SubscribePublish subscribePublish, M message, boolean isInstantMsg);
}

　　

 

2.订阅者接口

 

package com.shoshana.publishsubscribe;

public interface ISubcriber<M> {
    public void subcribe(SubscribePublish subscribePublish);

    public void unSubcribe(SubscribePublish subscribePublish);

    public void update(String publisher, M message);
}

　　

 

3.订阅器类

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package com.shoshana.publishsubscribe;   import java.util.ArrayList; import java.util.List; import java.util.concurrent.ArrayBlockingQueue; import java.util.concurrent.BlockingQueue;   public class SubscribePublish<M> {     //订阅器名称     private String name;     //订阅器队列容量     final int QUEUE_CAPACITY = 20;     //订阅器存储队列     private BlockingQueue<Msg> queue = new ArrayBlockingQueue<Msg>(QUEUE_CAPACITY);     //订阅者     private List<ISubcriber> subcribers = new ArrayList<ISubcriber>();       public SubscribePublish(String name) {         this.name = name;     }       public void publish(String publisher, M message, boolean isInstantMsg) {         if (isInstantMsg) {             update(publisher, message);             return;         }         Msg<M> m = new Msg<M>(publisher, message);         if (!queue.offer(m)) {             update();         }     }       public void subcribe(ISubcriber subcriber) {         subcribers.add(subcriber);     }       public void unSubcribe(ISubcriber subcriber) {         subcribers.remove(subcriber);     }       public void update() {         Msg m = null;         while ((m = queue.peek()) != null) {             this.update(m.getPublisher(), (M) m.getMsg());         }     }       public void update(String publisher, M Msg) {         for (ISubcriber subcriber : subcribers) {             subcriber.update(publisher, Msg);         }     } }   class Msg<M> {     private String publisher;     private M m;       public Msg(String publisher, M m) {         this.publisher = publisher;         this.m = m;     }       public String getPublisher() {         return publisher;     }       public void setPublisher(String publisher) {         this.publisher = publisher;     }       public M getMsg() {         return m;     }       public void setMsg(M m) {         this.m = m;     } }

　

4.发布者实现类

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package com.shoshana.publishsubscribe;   public class PublisherImpOne<M> implements IPublisher<M> {     private String name;       public PublisherImpOne(String name) {         super();         this.name = name;     }       public void publish(SubscribePublish subscribePublish, M message, boolean isInstantMsg) {         subscribePublish.publish(this.name, message, isInstantMsg);     } }

　　

　

5.订阅者实现类　

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package com.shoshana.publishsubscribe;   public class SubcriberImpOne<M> implements ISubcriber<M> {     public String name;       public SubcriberImpOne(String name) {         super();         this.name = name;     }       public void subcribe(SubscribePublish subscribePublish) {         subscribePublish.subcribe(this);     }       public void unSubcribe(SubscribePublish subscribePublish) {         subscribePublish.unSubcribe(this);     }       public void update(String publisher, M message) {         System.out.println(this.name + "收到" + publisher + "发来的消息:" + message.toString());     } }

　　

6.测试类

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package com.shoshana.publishsubscribe;   public class SubPubTest {     public static void main(String[] args) {         SubscribePublish<String> subscribePublish = new SubscribePublish<String>("订阅器");         IPublisher<String> publisher1 = new PublisherImpOne<String>("发布者1");         ISubcriber<String> subcriber1 = new SubcriberImpOne<String>("订阅者1");         ISubcriber<String> subcriber2 = new SubcriberImpOne<String>("订阅者2");         subcriber1.subcribe(subscribePublish);         subcriber2.subcribe(subscribePublish);         publisher1.publish(subscribePublish, "welcome", true);         publisher1.publish(subscribePublish, "to", true);         publisher1.publish(subscribePublish, "yy", false);     } }

测试结果:

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com.shoshana.publishsubscribe.SubPubTest 订阅者1收到发布者1发来的消息:welcome 订阅者2收到发布者1发来的消息:welcome 订阅者1收到发布者1发来的消息:to 订阅者2收到发布者1发来的消息:to   Process finished with exit code 0