@async的坑以及简单案例

在一个类中调用自己的方法，使用Async是由于AOP的规则，会导致异步失效（static也是失败的）

正确姿势：

@async的坑以及简单案例

将异步方法抽至另一个类中，将其注入到使用类直接掉用即可。

在配置自定义的线程池

package com.demo.config;

import lombok.extern.slf4j.Slf4j;
import org.springframework.aop.interceptor.AsyncUncaughtExceptionHandler;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.scheduling.annotation.AsyncConfigurer;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
import org.springframework.stereotype.Component;

import java.util.concurrent.Executor;
import java.util.concurrent.ThreadPoolExecutor;

/**
 * @author : chenjie
 * @date : 2019-11-09 0:12
 */
@Component
@Slf4j
public class AsyncConfig implements AsyncConfigurer {

    @Value("${thread.pool.corePoolSize:10}")
    private int corePoolSize;

    @Value("${thread.pool.maxPoolSize:20}")
    private int maxPoolSize;

    @Value("${thread.pool.keepAliveSeconds:30}")
    private int keepAliveSeconds;

    @Value("${thread.pool.queueCapacity:512}")
    private int queueCapacity;

    @Override
    public Executor getAsyncExecutor() {
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        executor.setCorePoolSize(corePoolSize);
        executor.setMaxPoolSize(maxPoolSize);
        executor.setKeepAliveSeconds(keepAliveSeconds);
        executor.setQueueCapacity(queueCapacity);
        executor.setWaitForTasksToCompleteOnShutdown(true);
        executor.setRejectedExecutionHandler((Runnable r, ThreadPoolExecutor exe) -> {
            log.warn("当前任务线程池队列已满.");
        });
        executor.initialize();
        return executor;
    }

    @Override
    public AsyncUncaughtExceptionHandler getAsyncUncaughtExceptionHandler() {
        return (ex, method, params) -> log.error("线程池执行任务发生未知异常.", ex);
    }
}

原理可参考：https://cloud.tencent.com/developer/article/1426027