JavaFuture模式

Posted 2020-12-29 Mature

 1 /*
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 4  * and open the template in the editor.
 5  */
 6 
 7 /**
 8  *
 9  * @author lx
10  */
11 
12 import java.util.concurrent.Callable;
13 import java.util.concurrent.ExecutionException;
14 import java.util.concurrent.FutureTask;
15 
16 public class FutureTackDome {
17 
18     
19     /**
20      * Java Future模式简单使用： 在此案例中模拟，接到到订单数据，并调用支付接口进行支付，支付成功返回2，支付失败返回0
21      * 
22      * @param args
23      * @throws Exception
24      * @throws ExecutionException
25      */
26     public static void main(String[] args) throws Exception, ExecutionException {
27         Callable<Student> callable = () -> {
28                     int id = 0;
29                     System.out.println("调用支付接口");
30                     while (id != 2) {
31                         Thread.sleep(5000);//模拟支付時間
32                         System.out.println("正在查询付款状态...");
33                         System.out.println("状态为：" + id);
34                         id++;
35                     }
36                     
37                     if (id == 2) {
38                         // 付款成功
39                         return new Student(id);
40                         
41                     } else {
42                         // 付款失败
43                         return new Student(0);
44                     }
45                 };
46         FutureTask<Student> futureTask = new FutureTask<>(callable);
47         new Thread(futureTask).start();
48 
49         while (futureTask.isDone()) {// 模拟等待支付状态回调
50 
51         }
52         System.out.println((futureTask.get().getId() == 2 ? "支付成功" : "支付失败"));
53 
54     }
55 }
56 //实体类
57 class Student {
58     Student() {
59 
60     }
61 
62     public Student(int id) {
63         super();
64         this.id = id;
65     }
66 
67     private int id;
68 
69     public int getId() {
70         return id;
71     }
72 
73     public void setId(int id) {
74         this.id = id;
75     }
76 
77     @Override
78     public String toString() {
79         return "Student [id=" + id + "]";
80     }
81 
82 }
83 
84 运行示例：
85 run:
86 调用支付接口
87 正在查询付款状态...
88 状态为：0
89 正在查询付款状态...
90 状态为：1
91 支付成功
92 成功构建 (总时间: 10 秒)