Future 模式
future 模式类似于一张提货单。
future 意思就是未来、期货(金融领域)。
实际案例
类信息概览：
| 类名 | 说明 |
|---|---|
| Main.java | 方法的总入口 |
| FutureData.java | 未来的数据 |
| Data.java | 数据 |
| Host.java | 客户端 |
| RealData.java | 实际的数据 |
定义
- FutureData.java
package com.github.houbb.thread.learn.easy.learn.future;
/**
* 2018/2/3
*
* @author houbinbin
* @version 1.0
* @since 1.7
*/
public class FutureData implements Data {
private RealData realData;
private boolean isReady = false;
public synchronized void setRealData(RealData realData) {
if(isReady) {
return; //balk
}
this.realData = realData;
this.isReady = true;
notifyAll();
}
@Override
public synchronized String getContent() {
while (!isReady) {
try {
wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
return this.realData.getContent();
}
}
- Data.java
package com.github.houbb.thread.learn.easy.learn.future;
/**
* 2018/2/3
*
* @author houbinbin
* @version 1.0
* @since 1.7
*/
public interface Data {
String getContent();
}
- Host.java
package com.github.houbb.thread.learn.easy.learn.future;
/**
* 2018/2/3
*
* @author houbinbin
* @version 1.0
* @since 1.7
*/
public class Host {
public Data request(final String string) {
//
System.out.println("Host.request() START...");
//1. future
final FutureData futureData = new FutureData();
//2.
new Thread(new Runnable() {
@Override
public void run() {
RealData realData = new RealData(string);
futureData.setRealData(realData);
}
}).start();
System.out.println("Host.request() END...");
return futureData;
}
}
- RealData.java
package com.github.houbb.thread.learn.easy.learn.future;
import com.github.houbb.thread.learn.easy.learn.ThreadUtil;
/**
* 2018/2/3
*
* @author houbinbin
* @version 1.0
* @since 1.7
*/
public class RealData implements Data {
private final String string;
public RealData(String string) {
ThreadUtil.sleep(1000);
this.string = string+"-real";
}
@Override
public String getContent() {
return this.string;
}
}
测试
- Main.java
package com.github.houbb.thread.learn.easy.learn.future;
/**
* 2018/2/3
*
* @author houbinbin
* @version 1.0
* @since 1.7
*/
public class Main {
public static void main(String[] args) {
Data futureDataA = new Host().request("A");
Data futureDataB = new Host().request("C");
Data futureDataC = new Host().request("D");
System.out.println(futureDataA.getContent());
System.out.println(futureDataB.getContent());
System.out.println(futureDataC.getContent());
}
}
- 测试结果
Host.request() START...
Host.request() END...
Host.request() START...
Host.request() END...
Host.request() START...
Host.request() END...
A-real
C-real
D-real
实现方式
UML & Code
UML
Code
代码地址
