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code/java/ThreadPoolExecutorDemo/src/callable/CallableDemo.java
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package callable;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import static common.ThreadPoolConstants.CORE_POOL_SIZE;
import static common.ThreadPoolConstants.KEEP_ALIVE_TIME;
import static common.ThreadPoolConstants.MAX_POOL_SIZE;
import static common.ThreadPoolConstants.QUEUE_CAPACITY;
public class CallableDemo {
public static void main(String[] args) {
//使用阿里巴巴推荐的创建线程池的方式
//通过ThreadPoolExecutor构造函数自定义参数创建
ThreadPoolExecutor executor = new ThreadPoolExecutor(
CORE_POOL_SIZE,
MAX_POOL_SIZE,
KEEP_ALIVE_TIME,
TimeUnit.SECONDS,
new ArrayBlockingQueue<>(QUEUE_CAPACITY),
new ThreadPoolExecutor.CallerRunsPolicy());
List<Future<String>> futureList = new ArrayList<>();
Callable<String> callable = new MyCallable();
for (int i = 0; i < 10; i++) {
//提交任务到线程池
Future<String> future = executor.submit(callable);
//将返回值 future 添加到 list，我们可以通过 future 获得 执行 Callable 得到的返回值
futureList.add(future);
}
for (Future<String> fut : futureList) {
try {
System.out.println(new Date() + "::" + fut.get());
} catch (InterruptedException | ExecutionException e) {
e.printStackTrace();
}
}
//关闭线程池
executor.shutdown();
}
}

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code/java/ThreadPoolExecutorDemo/src/callable/MyCallable.java
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package callable;
import java.util.concurrent.Callable;
public class MyCallable implements Callable<String> {
@Override
public String call() throws Exception {
Thread.sleep(1000);
//返回执行当前 Callable 的线程名字
return Thread.currentThread().getName();
}
}

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code/java/ThreadPoolExecutorDemo/src/common/ThreadPoolConstants.java
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package common;
public class ThreadPoolConstants {
public static final int CORE_POOL_SIZE = 5;
public static final int MAX_POOL_SIZE = 10;
public static final int QUEUE_CAPACITY = 100;
public static final Long KEEP_ALIVE_TIME = 1L;
private ThreadPoolConstants(){
}
}

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code/java/ThreadPoolExecutorDemo/src/threadPoolExecutor/MyRunnable.java
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package threadPoolExecutor;
import java.util.Date;
/**
* 这是一个简单的Runnable类，需要大约5秒钟来执行其任务。
* @author shuang.kou
*/
public class MyRunnable implements Runnable {
private String command;
public MyRunnable(String s) {
this.command = s;
}
@Override
public void run() {
System.out.println(Thread.currentThread().getName() + " Start. Time = " + new Date());
processCommand();
System.out.println(Thread.currentThread().getName() + " End. Time = " + new Date());
}
private void processCommand() {
try {
Thread.sleep(5000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
@Override
public String toString() {
return this.command;
}
}

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code/java/ThreadPoolExecutorDemo/src/threadPoolExecutor/ThreadPoolExecutorDemo.java
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package threadPoolExecutor;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import static common.ThreadPoolConstants.CORE_POOL_SIZE;
import static common.ThreadPoolConstants.KEEP_ALIVE_TIME;
import static common.ThreadPoolConstants.MAX_POOL_SIZE;
import static common.ThreadPoolConstants.QUEUE_CAPACITY;
public class ThreadPoolExecutorDemo {
public static void main(String[] args) {
//使用阿里巴巴推荐的创建线程池的方式
//通过ThreadPoolExecutor构造函数自定义参数创建
ThreadPoolExecutor executor = new ThreadPoolExecutor(
CORE_POOL_SIZE,
MAX_POOL_SIZE,
KEEP_ALIVE_TIME,
TimeUnit.SECONDS,
new ArrayBlockingQueue<>(QUEUE_CAPACITY),
new ThreadPoolExecutor.CallerRunsPolicy());
for (int i = 0; i < 10; i++) {
//创建WorkerThread对象（WorkerThread类实现了Runnable 接口）
Runnable worker = new MyRunnable("" + i);
//执行Runnable
executor.execute(worker);
}
//终止线程池
executor.shutdown();
while (!executor.isTerminated()) {
}
System.out.println("Finished all threads");
}
}