Created
February 17, 2017 10:35
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CompletableFuture sample(with simple error handling)
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package com.example; | |
import java.util.concurrent.CompletableFuture; | |
import java.util.concurrent.ExecutorService; | |
import java.util.concurrent.Executors; | |
public class Comp { | |
public static void main(String[] args) { | |
ExecutorService es = Executors.newFixedThreadPool(3); | |
CompletableFuture.allOf( | |
CompletableFuture.runAsync(() -> callService("line1"),es), | |
CompletableFuture.runAsync(() -> callService("line2-error"),es) | |
.exceptionally(e -> errorHandle(e)) // add error handling. | |
//... | |
).join(); | |
System.out.println("end"); | |
es.shutdown(); | |
} | |
private static void callService(String content){ | |
System.out.println("call " + content + " in " + Thread.currentThread()); | |
if (content.contains("error")) { | |
throw new RuntimeException("fake error"); | |
} | |
try { | |
Thread.sleep(1000L); | |
} catch (InterruptedException e) { | |
e.printStackTrace(); | |
} | |
} | |
private static Void errorHandle(Throwable e){ | |
if (e != null) { | |
System.out.println("error occured. " + e.getMessage()); | |
} | |
return null; | |
} | |
} |
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