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SpringBoot 多线程 中 @Async 和 ThreadPoolTaskExecutor 的使用

2020年07月17日  | 移动技术网IT编程  | 我要评论

配置线程池，实现AsyncConfigurer接口

getAsyncExecutor 设置线程池

getAsyncUncaughtExceptionHandler 异常日志处理

import lombok.extern.slf4j.Slf4j;
import org.springframework.aop.interceptor.AsyncUncaughtExceptionHandler;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.annotation.AsyncConfigurer;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
import java.util.concurrent.Executor;

@Configuration
@EnableAsync
@Slf4j
public class AsyncConfig implements AsyncConfigurer {
    @Override
    public Executor getAsyncExecutor() {
        // 自定义线程池
        ThreadPoolTaskExecutor taskExecutor = new ThreadPoolTaskExecutor();
        // 核心线程数
        taskExecutor.setCorePoolSize(20);
        // 最大线程数
        taskExecutor.setMaxPoolSize(40);
        // 线程队列最大线程数
        taskExecutor.setQueueCapacity(1000);
        taskExecutor.setKeepAliveSeconds(999999999);
        taskExecutor.setRejectedExecutionHandler(new RejectedExecutionHandlerImpl());
        // 初始化线程池
        taskExecutor.initialize();
        return taskExecutor;
    }

    @Override
    public AsyncUncaughtExceptionHandler getAsyncUncaughtExceptionHandler() {
        return (ex, method, params) -> {
            log.error("Error Occurs in async method:{}", ex.getMessage());
        };
    }

}

ThreadPoolTaskExecutor 底层调用的是jdk的ThreadPoolExecutor
在这里插入图片描述

b()方法 模拟异步线程返回值Future

c()方法 模拟异步线程异常处理


import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.scheduling.annotation.Async;
import org.springframework.scheduling.annotation.AsyncResult;
import org.springframework.stereotype.Component;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;

/**
 * @Author hzy
 * @Date 2020/7/15 20:12
 */
@RestController
@RequestMapping("/air")
public class AirController {

    @Autowired
    A a;

    @RequestMapping("/test")
    public void test() throws Exception {
        a.a();
        Future<String> future = a.b();
        while (true) {  //等待获取结果信息
            if (future.isDone()) {  //判断是否执行完毕
                System.out.println("Result from b - " + future.get());
                break;
            }
            System.out.println("------------continue");
            Thread.sleep(1000);
        }
        System.out.println("-------模拟异常处理");
        a.c();
    }


}

@Component
class A{

    @Async
    public void a() throws InterruptedException {
        System.out.println("Execute method - a " + Thread.currentThread().getName());
        Thread.sleep(1000);
        System.out.println("a方法结束");
    }

    @Async
    public Future<String> b() throws InterruptedException {
        System.out.println("Execute method - b " + Thread.currentThread().getName());
        Thread.sleep(5000);
        System.out.println("b方法结束");
        return new AsyncResult<String>("hello world !!!!");
    }

    @Async
    public void c() throws Exception {
        System.out.println("Execute method - c " + Thread.currentThread().getName());
        throw new Exception("抛出异常");
    }
}

本文地址：https://blog.csdn.net/weixin_40760239/article/details/107388335

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