线程池四种创建线程的方法
2022年12月24日约 1239 字大约 4 分钟
线程池四种创建线程的方法
1. 四种方式
1.1 方式一:通过 Runnable 使用线程池
最基础的使用方式:无法知道执行结果
/**
* 方式一:通过 Runnable 使用线程池
* 无阻塞表现在:线程还没有执行完,就打印了 “总结耗时:”
*/
private void testRunnable() {
long start = System.currentTimeMillis();
for (int i = 0; i < 1000; i++) {
MyRunnable myRunnable = new MyRunnable();
threadPoolTaskExecutor.submit(myRunnable);
}
logger.info(String.format("总结耗时:%s", System.currentTimeMillis() - start));
}
1.2 方式二: 通过 Callable 使用线程池
使用Callable 可以监听到回调。会阻塞。后面的语句要等直接完成后
/**
* 方式二: 使用Callable 可以监听到回调。
* 阻塞表现在:总在最后打印 “总结耗时:”
* Callable的Future 能接受到具体结果,也就是线程的生成的随机数
*/
private void testCallable() {
long start = System.currentTimeMillis();
for (int i = 0; i < 1000; i++) {
MyCallable myCallable = new MyCallable();
Future<Double> future = threadPoolTaskExecutor.submit(myCallable);
try {
Double result = future.get();
logger.error("Callable返回的结果为:" + result);
} catch (Exception e) {
e.printStackTrace();
}
}
logger.info(String.format("总结耗时:%s", System.currentTimeMillis() - start));
}
1.3 方式三:threadPoolTaskExecutor.submitListenable 返回ListenableFuture 参数:Runnable
- 无阻塞表现在:线程还没有执行完,就打印了 “总结耗时:”
- Runnable监听ListenableFuture 只能知道线程是否执行完毕,线程生成的结果(随机数无法得知)
/**
* 方式三: threadPoolTaskExecutor.submitListenable 返回ListenableFuture 参数:Runnable
* 无阻塞表现在:线程还没有执行完,就打印了 “总结耗时:”
* Runnable监听ListenableFuture 只能知道线程是否执行完毕,线程生成的结果(随机数无法得知)
*/
private void testSubmitListenableRunnable() {
long start = System.currentTimeMillis();
for (int i = 0; i < 1000; i++) {
MyRunnable myRunnable = new MyRunnable();
ListenableFuture listenableFuture = threadPoolTaskExecutor.submitListenable(myRunnable);
listenableFuture.addCallback(new SuccessCallback() {
@Override
public void onSuccess(Object o) {
logger.info("请求成功:" + Thread.currentThread().getName() + "返回的object:" + o);
}
}, new FailureCallback() {
@Override
public void onFailure(Throwable throwable) {
logger.info("请求失败:" + throwable.getMessage());
}
});
}
logger.info(String.format("总结耗时:%s", System.currentTimeMillis() - start));
}
1.4 方式四: threadPoolTaskExecutor.submitListenable 返回ListenableFuture 参数:Callable
/**
* 方式四: threadPoolTaskExecutor.submitListenable 返回ListenableFuture 参数:Callable
* 无阻塞表现在:线程还没有执行完,就打印了 “总结耗时:”
* Callable监听ListenableFuture 能接受到具体结果,也就是线程的生成的随机数
*/
private void testSubmitListenableCallable() {
long start = System.currentTimeMillis();
for (int i = 0; i < 1000; i++) {
MyCallable myCallable = new MyCallable();
ListenableFuture<Double> listenableFuture = threadPoolTaskExecutor.submitListenable(myCallable);
listenableFuture.addCallback(new SuccessCallback<Double>() {
@Override
public void onSuccess(Double result) {
logger.info("请求成功:" + Thread.currentThread().getName() + "具体的执行结果:" + result);
}
}, new FailureCallback() {
@Override
public void onFailure(Throwable throwable) {
logger.info("请求失败:" + throwable.getMessage());
}
});
}
logger.info(String.format("总结耗时:%s", System.currentTimeMillis() - start));
}
2. 测试
package com.zszdevelop.threadpooldemo;
import com.zszdevelop.threadpooldemo.service.impl.AsyncServiceImpl;
import org.junit.jupiter.api.BeforeAll;
import org.junit.jupiter.api.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
import org.springframework.util.concurrent.FailureCallback;
import org.springframework.util.concurrent.ListenableFuture;
import org.springframework.util.concurrent.SuccessCallback;
import java.util.concurrent.Callable;
import java.util.concurrent.Future;
import java.util.concurrent.ThreadPoolExecutor;
/**
* @author 作者: zhangshengzhong
* @文件名: ThreadPoolTest
* @版本号:1.0
* @创建日期: 2020/12/9 9:32
* @描述:
*/
public class ThreadPoolTest {
Logger logger = LoggerFactory.getLogger(this.getClass());
private static ThreadPoolTaskExecutor threadPoolTaskExecutor;
@BeforeAll
public static void init(){
threadPoolTaskExecutor = new ThreadPoolTaskExecutor();
threadPoolTaskExecutor.setCorePoolSize(5);
threadPoolTaskExecutor.setMaxPoolSize(10);
threadPoolTaskExecutor.setQueueCapacity(50);
threadPoolTaskExecutor.setKeepAliveSeconds(30);
threadPoolTaskExecutor.setThreadNamePrefix("MY-Thread");
threadPoolTaskExecutor.setWaitForTasksToCompleteOnShutdown(true);
threadPoolTaskExecutor.setAwaitTerminationSeconds(60);
threadPoolTaskExecutor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
threadPoolTaskExecutor.initialize();
}
@Test
public void test(){
// 方式一:通过 Runnable 使用线程池
// testRunnable();
// 方式二: 使用Callable 可以监听到回调。会阻塞。后面的语句要等直接完成后
testCallable();
// 方式三: threadPoolTaskExecutor.submitListenable 返回ListenableFuture 无阻塞的形式 参数:Runnable
// testSubmitListenableRunnable();
// 方式四: threadPoolTaskExecutor.submitListenable 返回ListenableFuture 无阻塞的形式 参数:Callable
// testSubmitListenableCallable();
}
/**
* 方式一:通过 Runnable 使用线程池
* 无阻塞表现在:线程还没有执行完,就打印了 “总结耗时:”
*/
private void testRunnable() {
long start = System.currentTimeMillis();
for (int i = 0; i < 1000; i++) {
MyRunnable myRunnable = new MyRunnable();
threadPoolTaskExecutor.submit(myRunnable);
}
logger.info(String.format("总结耗时:%s", System.currentTimeMillis() - start));
}
/**
* 方式二: 使用Callable 可以监听到回调。
* 阻塞表现在:总在最后打印 “总结耗时:”
* Callable的Future 能接受到具体结果,也就是线程的生成的随机数
*/
private void testCallable() {
long start = System.currentTimeMillis();
for (int i = 0; i < 1000; i++) {
MyCallable myCallable = new MyCallable();
Future<Double> future = threadPoolTaskExecutor.submit(myCallable);
try {
Double result = future.get();
logger.error("Callable返回的结果为:" + result);
} catch (Exception e) {
e.printStackTrace();
}
}
logger.info(String.format("总结耗时:%s", System.currentTimeMillis() - start));
}
/**
* 方式三: threadPoolTaskExecutor.submitListenable 返回ListenableFuture 参数:Runnable
* 无阻塞表现在:线程还没有执行完,就打印了 “总结耗时:”
* Runnable监听ListenableFuture 只能知道线程是否执行完毕,线程生成的结果(随机数无法得知)
*/
private void testSubmitListenableRunnable() {
long start = System.currentTimeMillis();
for (int i = 0; i < 1000; i++) {
MyRunnable myRunnable = new MyRunnable();
ListenableFuture listenableFuture = threadPoolTaskExecutor.submitListenable(myRunnable);
listenableFuture.addCallback(new SuccessCallback() {
@Override
public void onSuccess(Object o) {
logger.info("请求成功:" + Thread.currentThread().getName() + "返回的object:" + o);
}
}, new FailureCallback() {
@Override
public void onFailure(Throwable throwable) {
logger.info("请求失败:" + throwable.getMessage());
}
});
}
logger.info(String.format("总结耗时:%s", System.currentTimeMillis() - start));
}
/**
* 方式四: threadPoolTaskExecutor.submitListenable 返回ListenableFuture 参数:Callable
* 无阻塞表现在:线程还没有执行完,就打印了 “总结耗时:”
* Callable监听ListenableFuture 能接受到具体结果,也就是线程的生成的随机数
*/
private void testSubmitListenableCallable() {
long start = System.currentTimeMillis();
for (int i = 0; i < 1000; i++) {
MyCallable myCallable = new MyCallable();
ListenableFuture<Double> listenableFuture = threadPoolTaskExecutor.submitListenable(myCallable);
listenableFuture.addCallback(new SuccessCallback<Double>() {
@Override
public void onSuccess(Double result) {
logger.info("请求成功:" + Thread.currentThread().getName() + "具体的执行结果:" + result);
}
}, new FailureCallback() {
@Override
public void onFailure(Throwable throwable) {
logger.info("请求失败:" + throwable.getMessage());
}
});
}
logger.info(String.format("总结耗时:%s", System.currentTimeMillis() - start));
}
class MyRunnable implements Runnable {
MyRunnable() {
}
@Override
public void run() {
double random = Math.random();
// 执行你要的操作
logger.info("当前线程:" + Thread.currentThread().getName() + " 生成的随机数:" + random);
}
}
class MyCallable implements Callable<Double> {
MyCallable() {
}
@Override
public Double call() throws Exception {
double random = Math.random();
// 执行你要的操作
logger.info("当前线程:" + Thread.currentThread().getName() + " 生成的随机数:" + random);
return random;
}
}
}
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