@async的坑以及簡單案例

在一個類中調用自己的方法，使用Async是由於AOP的規則，會導致異步失效（static也是失敗的）

 

正確姿勢：

將異步方法抽至另一個類中，將其注入到使用類直接掉用即可。

在配置自定義的線程池

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("當前任務線程池隊列已滿.");
        });
        executor.initialize();
        return executor;
    }

    @Override
    public AsyncUncaughtExceptionHandler getAsyncUncaughtExceptionHandler() {
        return (ex, method, params) -> log.error("線程池執行任務發生未知異常.", ex);
    }
}

 

原理可參考：https://cloud.tencent.com/developer/article/1426027