自定义线程池线程池参数详解

private static int corePoolSize = 20;
private static int maxPoolSize = 100;
private static int keepAliveTime = 0;
private static TimeUnit timeUnit = TimeUnit.MINUTES;
private static BlockingQueue blockingQueue = new ArrayBlockingQueue<>(9999);
private static RejectedExecutionHandler handler = new ThreadPoolExecutor.CallerRunsPolicy();

private static ThreadPoolExecutor pool = 
    new ThreadPoolExecutor(corePoolSize, maxPoolSize, keepAliveTime, timeUnit, blockingQueue, handler);

corePoolSize: 线程池的核心线程数(公司骨干成员)

maxPoolSize: 线程大容量(公司最多能容纳这些人)

keepAliveTime: 非核心线程存活时间

timeUnit: 时间单位(秒还是分)

blockingQueue: 阻塞队列 , 当线程数达到核心线程数时，任务就会在阻塞队列中等待，若等待的任务数大于指定队列的大小，则开启非核心线程进行执行任务, 最maxPoolSize个

RejectedExecutionHandler: 拒绝策略当线程数量达到非核心线程数, 并且队列中的等待的任务也满了, 那么则执行拒绝策略

其他决绝策略, 点击查看

项目统一用一个线程池

public final class ThreadPoolFactory {

    private static volatile ThreadPoolExecutor threadPoolExecutor = null;

    private static final int CORE_POOL_SIZE = 0;
    private static final int MAX_MUM_POOL_SIZE = 1000;
    private static final long KEEP_ALIVE_TIME = 2;
    private static final TimeUnit UNIT = TimeUnit.MINUTES;
    private static final int CAPACITY = 20;
    private static RejectedExecutionHandler HANDLER = new ThreadPoolExecutor.CallerRunsPolicy();

    private ThreadPoolFactory() {
    }

    public static ThreadPoolExecutor getInstance() {
        if (threadPoolExecutor == null) {
            synchronized (ThreadPoolFactory.class) {
                if (threadPoolExecutor == null) {
                    threadPoolExecutor = new ThreadPoolExecutor(CORE_POOL_SIZE, MAX_MUM_POOL_SIZE, KEEP_ALIVE_TIME, UNIT, new ArrayBlockingQueue<>(CAPACITY), HANDLER);
                }
            }
        }
        return threadPoolExecutor;
    }
}

自定义线程池 线程池参数详解

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自定义线程池线程池参数详解