CompletableFuture指定ThreadPoolTaskExecutor自定义线程池

前言

用的是springboot

二、使用步骤

1.创建自定义线程池

代码如下：

@Configuration
public class asyncTaskExecutorConfig {
	//阻塞队列
    private static final int workQueue = 20;
    //线程空闲后的存活时长
    private static final int keepAliveTime = 30;
    //Cpu核数
    private static final int CPU_COUNT = Runtime.getRuntime().availableProcessors();
    //核心线程数量大小
    private static final int corePoolSize = Math.max(2, Math.min(CPU_COUNT - 1, 4));
    //线程池最大容纳线程数
    private static final int maxPoolSize = CPU_COUNT * 2 + 1;
    @Bean("asyncTaskExecutor")
    public ThreadPoolTaskExecutor  asyncTaskExecutor() {
        ThreadPoolTaskExecutor threadPoolTaskExecutor = new ThreadPoolTaskExecutor();
        threadPoolTaskExecutor.setThreadNamePrefix("asyncTaskExecutor-");//线程前缀
        threadPoolTaskExecutor.setCorePoolSize(corePoolSize);//核心线程数
        threadPoolTaskExecutor.setMaxPoolSize(maxPoolSize);//最大线程数
        threadPoolTaskExecutor.setQueueCapacity(workQueue);//等待队列
        threadPoolTaskExecutor.setKeepAliveSeconds(keepAliveTime);//线程池维护线程所允许的空闲时间,单位为秒
        threadPoolTaskExecutor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());// 线程池对拒绝任务(无线程可用)的处理策略
        threadPoolTaskExecutor.initialize();
        return threadPoolTaskExecutor;
    }

}

2.工具类注入线程池

代码如下：

@Autowired
@Qualifier("asyncTaskExecutor")
private ThreadPoolTaskExecutor asyncTaskExecutor;

此处的@Qualifier注解名称为上一步线程池中的bean中定义的名称。

3. 使用

代码如下：

	/**
     * 异步执行
     * @param call
     */
    private void async(Runnable call) {
        CompletableFuture<Void> runFuture = CompletableFuture.runAsync(call::run, asyncTaskExecutor).exceptionally(e -> {
            log.error("当前线程{},异步执行失败", Thread.currentThread().getName(), e);
            return null;
        });
        try {
            runFuture.get(30, TimeUnit.SECONDS);
        } catch (InterruptedException | ExecutionException | TimeoutException e) {
            log.error("当前线程{},异步操作执行失败", Thread.currentThread().getName(), e);
        }
    }

此处例子只示范了一下无返回值的runAsync方法。

总结

以上如有错误之处请指出，后续改进