[Java] Spring Boot对Future模式的支持详解

• boolean cancel(boolean mayinterruptifrunning);//可以在任务执行过程中取消任务
  
• boolean iscancelled();//判断future任务是否取消
  
• boolean isdone();//判断任务是否完成
  
• v get();//获取任务最终结果，这是一个阻塞方法，会等待任务执行好才会执行后面的代码
  
• v get(long timeout, timeunit unit);//有等待时常的get方法，等待时间到了后仍然没有计算完成，则抛异常
  

@configuration
@enableasync
public class asyncconfig implements asyncconfigurer {
 
 @override
 public executor getasyncexecutor() {
 threadpooltaskexecutor taskexecutor = new threadpooltaskexecutor();
 //核心线程数
 taskexecutor.setcorepoolsize(8);
 //最大线程数
 taskexecutor.setmaxpoolsize(16);
 //队列大小
 taskexecutor.setqueuecapacity(100);
 taskexecutor.initialize();
 return taskexecutor;
 }
}

@service
public class futureservice {
 
 @async
 public future<string> futuretest() throws interruptedexception {
 system.out.println("任务执行开始,需要：1000ms");
 for (int i = 0; i < 10; i++) {
  thread.sleep(100);
  system.out.println("do:" + i);
 }
 system.out.println("完成任务");
 return new asyncresult<>(thread.currentthread().getname());
 }
}

@resource
private futureservice futureservice;
 
@test
public void futuretest() throws interruptedexception, executionexception {
 long start = system.currenttimemillis();
 system.out.println("开始");
 //耗时任务
 future<string> future = futureservice.futuretest();
 //另外一个耗时任务
 thread.sleep(500);
 system.out.println("另外一个耗时任务，需要500ms");
 
 string s = future.get();
 system.out.println("计算结果输出:" + s);
 system.out.println("共耗时：" + (system.currenttimemillis() - start));
}

开始
2019-01-07 23:50:34.726 info 14648 --- [ main] o.s.s.concurrent.threadpooltaskexecutor : initializing executorservice
任务执行开始,需要：1000ms
do:0
do:1
do:2
do:3
另外一个耗时任务，需要500ms
do:4
do:5
do:6
do:7
do:8
do:9
完成任务
计算结果输出:threadpooltaskexecutor-1
共耗时：1016
process finished with exit code 0