java ThreadPoolExecutor 并发调用实例详解

java ThreadPoolExecutor 并发调用实例详解

java ThreadPoolExecutor 并发调用实例详解

概述

通常为了提供任务的处理速度,会使用一些并发模型，ThreadPoolExecutor中的invokeAll便是一种。

代码

package test.current;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.List;

import java.util.concurrent.Callable;

import java.util.concurrent.ExecutionException;

import java.util.concurrent.Future;

public class TestCallable {

public static void main(String[] args) throws InterruptedException, ExecutionException {

List>> tasks = new ArrayList<>();

for (int i = 0; i < 10; i++) {

Callable> task = new Callable>() {

@Override

public List call() throws Exception {

return Arrays.asList(1L,2L);

}

};

tasks.add(task);

}

List finalResults = new ArrayList<>(10);

List>> results = ThreadPool.getThreadPool().invokeAll(tasks);

for(Future> ele : results) {

List list = ele.get();

finalResults.addAll(list);

}

System.out.println(finalResults);

}

}

package test.current;

import java.util.concurrent.ArrayBlockingQueue;

import java.util.concurrent.ThreadPoolExecutor;

import java.util.concurrent.TimeUnit;

public class ThreadPool {

private static final int CORE_SIZE = 8;

private static final int MAX_SIZE = 12;

private static final long KEEP_ALIVE_TIME = 30;

private static final int QUEUE_SIZE = 50000;

private static ThreadPoolExecutor threadPool = new ThreadPoolExecutor(CORE_SIZE, MAX_SIZE, KEEP_ALIVE_TIME,

TimeUnit.SECONDS, new ArrayBlockingQueue(QUEUE_SIZE), new ThreadPoolExecutor.AbortPolicy());

public static ThreadPoolExecutor getThreadPool() {

return threadPool;

}

}

可以把需要执行的任务创建一个Callable task,利用线程池中的线程并发的执行这些task,从而提高任务的执行效率。

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