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zhengyingbing authored6b89a024
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package com.hl.account;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledThreadPoolExecutor;
import java.util.concurrent.SynchronousQueue;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
/**
* 线程池管理类
*
* @author changcsw 2015-11-6
*
*/
public final class ThreadPoolManager {
// 获取CPU
private static final int CPU_COUNT = Runtime.getRuntime().availableProcessors();
// 线程池中最少的线程的数量
private static final int CORE_POOL_SIZE = (CPU_COUNT + 1) > 3 ? (CPU_COUNT + 1) : 3;
// 线程池中最多的线程的数量
private static final int MAXIMUM_POOL_SIZE = (CPU_COUNT > 1) ? (CPU_COUNT * 2 + 1) : 5;
// 空闲线程的最长存活时间
private static final long KEEP_ALIVE = 1L;
// 工作队列-阻塞队列
private static final BlockingQueue<Runnable> WORK_QUEUE = new LinkedBlockingQueue<Runnable>(128);
// 线程池中线程的创建工厂
private static final ThreadFactory THREAD_FACTORY = new ThreadFactory() {
// 原子操作级别的整数，初始值是1
private final AtomicInteger mCount = new AtomicInteger(1);
@Override
public Thread newThread(Runnable r) {
Thread thread = new Thread(r, "Thread #" + mCount.getAndIncrement()); // 线程名，前缀固定，后缀自增长
thread.setPriority(Thread.NORM_PRIORITY); // 正常优先级
return thread;
}
};
/************************************** 线程池中线程的执行的管理器 ******************************************/
// 普通的任务用这个执行器， 缺点：当没有任务是还会CORE_POOL_SIZE个线程占用资源，优点：无需频繁调度
public static final ExecutorService EXECUTOR = new ThreadPoolExecutor(CORE_POOL_SIZE, MAXIMUM_POOL_SIZE,
KEEP_ALIVE, TimeUnit.SECONDS, WORK_QUEUE, THREAD_FACTORY, new ThreadPoolExecutor.DiscardPolicy());
// 有新的任务就开启新的线程，当没有新任务时会自动回收线程，缺点：频繁调度， 优点：快速处理任务
public static final ExecutorService CACHED_EXECUTOR = new ThreadPoolExecutor(CORE_POOL_SIZE, Integer.MAX_VALUE,
60L, TimeUnit.SECONDS, new SynchronousQueue<Runnable>(), THREAD_FACTORY,
new ThreadPoolExecutor.DiscardOldestPolicy());
// 当有计划的执行一个任务时用，如检查版本更新,
public static final ScheduledExecutorService SCHEDULED_EXECUTOR = new ScheduledThreadPoolExecutor(CORE_POOL_SIZE,
THREAD_FACTORY, new ThreadPoolExecutor.DiscardPolicy());
/************************************** 线程池中线程的执行的管理器 ******************************************/
}