Java线程池：设置核心线程可超时被关闭（allowCoreThreadTimeOut）

• ThreadPoolExecutor
• ThreadPoolTaskExecutor

Java线程池可以设置核心线程也随超时时间关闭，节省资源
java.util.concurrent.ThreadPoolExecutor

    
    private volatile boolean allowCoreThreadTimeOut;
    
	
    public void allowCoreThreadTimeOut(boolean value) {
        if (value && keepAliveTime <= 0)
            throw new IllegalArgumentException("Core threads must have nonzero keep alive times");
        if (value != allowCoreThreadTimeOut) {
            allowCoreThreadTimeOut = value;
            if (value)
                interruptIdleWorkers();
        }
    }

spring带的线程池可以设置，归根到底也是调用原生线程池的方法org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor

他有一个属性allowCoreThreadTimeOut ，将其设为true，则可以控制coresize核心线程也能被关闭

	private boolean allowCoreThreadTimeOut = false;

	
	public void setAllowCoreThreadTimeOut(boolean allowCoreThreadTimeOut) {
		this.allowCoreThreadTimeOut = allowCoreThreadTimeOut;
	}
	

ThreadPoolTaskExecutor设置处

		if (this.taskDecorator != null) {
			executor = new ThreadPoolExecutor(
					this.corePoolSize, this.maxPoolSize, this.keepAliveSeconds, TimeUnit.SECONDS,
					queue, threadFactory, rejectedExecutionHandler) {
				@Override
				public void execute(Runnable command) {
					Runnable decorated = taskDecorator.decorate(command);
					if (decorated != command) {
						decoratedTaskMap.put(decorated, command);
					}
					super.execute(decorated);
				}
			};
		}
		else {
			executor = new ThreadPoolExecutor(
					this.corePoolSize, this.maxPoolSize, this.keepAliveSeconds, TimeUnit.SECONDS,
					queue, threadFactory, rejectedExecutionHandler);

		}

		if (this.allowCoreThreadTimeOut) {
			executor.allowCoreThreadTimeOut(true);
		}