线程池实例之提交返回类型不同的任务
所属分类 java
浏览量 749
pool.submit 返回 future , future.get 获取结果
构建 FutureTask 提交到线程池 ,然后通过 FutureTask.get 获取结果
FutureTask 实现了RunnableFuture接口
RunnableFuture继承了Runnable和Future接口
既可以作为Runnable被线程执行,又可以作为Future得到Callable的返回值
import java.time.LocalDateTime;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.Callable;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.FutureTask;
import java.util.concurrent.RejectedExecutionHandler;
import java.util.concurrent.SynchronousQueue;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.ThreadPoolExecutor.AbortPolicy;
import java.util.concurrent.TimeUnit;
public class MultiTypeValueFuture {
public static void main(String[] args) throws Exception {
int coreSize = 1;
int maxSize = 3;
BlockingQueue workQueue = new SynchronousQueue();
ThreadFactory threadFactory = Executors.defaultThreadFactory();
RejectedExecutionHandler rejectHandler = new AbortPolicy();
ThreadPoolExecutor pool = new ThreadPoolExecutor(coreSize, maxSize, 60, TimeUnit.SECONDS, workQueue,
threadFactory, rejectHandler);
Future intResultFuture = pool.submit(new IntResultTask());
System.out.println("IntResultTask submit done," + LocalDateTime.now().toString());
Future stringResultFuture = pool.submit(new StringResultTask());
System.out.println("StringResultTask submit done," + LocalDateTime.now().toString());
// 构建 FutureTask 提交
FutureTask longResultFutureTask = new FutureTask<>(new LongResultTask());
pool.submit(longResultFutureTask);
System.out.println("LongResultTask submit done," + LocalDateTime.now().toString());
System.out.println();
Integer intResult = intResultFuture.get();
System.out.println("intResult=" + intResult + "," + LocalDateTime.now().toString());
String stringResult = stringResultFuture.get();
System.out.println("stringResult=" + stringResult + "," + LocalDateTime.now().toString());
Long longResult = longResultFutureTask.get();
System.out.println("longResult=" + longResult + "," + LocalDateTime.now().toString());
}
private static class IntResultTask implements Callable {
public Integer call() throws Exception {
Thread.sleep(1000);
System.out.println("IntResultTask done," + LocalDateTime.now().toString());
return 1;
}
}
private static class StringResultTask implements Callable {
public String call() throws Exception {
Thread.sleep(1500);
System.out.println("StringResultTask done," + LocalDateTime.now().toString());
return LocalDateTime.now().toString();
}
}
private static class LongResultTask implements Callable {
public Long call() throws Exception {
Thread.sleep(500);
System.out.println("LongResultTask done," + LocalDateTime.now().toString());
return System.currentTimeMillis();
}
}
}
IntResultTask submit done,2021-10-30T11:35:55.998
StringResultTask submit done,2021-10-30T11:35:56
LongResultTask submit done,2021-10-30T11:35:56.002
LongResultTask done,2021-10-30T11:35:56.502
IntResultTask done,2021-10-30T11:35:56.802
intResult=1,2021-10-30T11:35:56.802
StringResultTask done,2021-10-30T11:35:57.503
stringResult=2021-10-30T11:35:57.503,2021-10-30T11:35:57.503
longResult=1635564956503,2021-10-30T11:35:57.504
完整代码
https://gitee.com/dyyx/hellocode/blob/master/src/dyyx/conc/MultiTypeValueFuture.java
Runnable Callable Future FutureTask
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