工具类-线程池

来源：互联网发布：大数据的实践包括编辑：程序博客网时间：2024/05/22 15:48

线程池的基本类（默认是单例的否则线程无法得到控制）

public class ThreadManager {    public static ThreadPool instance;    private ThreadPoolExecutor longExecutor; // 耗时比较长的线程池   用来请求网络    private ThreadPoolExecutor shortExecutor; // 比较短的线程池    用来加载本地数据    // 获取单例的线程池对象    public static ThreadPool getInstance() {        if (instance == null) {            synchronized (ThreadManager.class) {                if (instance == null) {                    int cpuNum = Runtime.getRuntime().availableProcessors();// 获取处理器数量                    int threadNum = cpuNum * 2 + 1;// 根据cpu数量,计算出合理的线程并发数                    instance = new ThreadPool(threadNum-1, threadNum, Integer.MAX_VALUE);//默认是双核的cpu 每个核心走一个线程 一个等待线程                }            }        }        return instance;    }    public static class ThreadPool {        private ThreadPoolExecutor mExecutor;        private int corePoolSize;        private int maximumPoolSize;        private long keepAliveTime;        private ThreadPool(int corePoolSize, int maximumPoolSize, long keepAliveTime) {            this.corePoolSize = corePoolSize;            this.maximumPoolSize = maximumPoolSize;            this.keepAliveTime = keepAliveTime;        }        public void execute(Runnable runnable) {            if (runnable == null) {                return;            }            if (mExecutor == null) {                mExecutor = new ThreadPoolExecutor(corePoolSize,// 核心线程数                        maximumPoolSize, // 最大线程数                        keepAliveTime, // 闲置线程存活时间                        TimeUnit.MILLISECONDS,// 时间单位                        new LinkedBlockingDeque<Runnable>(Integer.MAX_VALUE),// 线程队列                        Executors.defaultThreadFactory(),// 线程工厂                        new ThreadPoolExecutor.AbortPolicy() {// 队列已满,而且当前线程数已经超过最大线程数时的异常处理策略                            @Override                            public void rejectedExecution(Runnable r, ThreadPoolExecutor e) {                                super.rejectedExecution(r, e);                            }                        }                );            }            mExecutor.execute(runnable);        }        // 从线程队列中移除对象        public void cancel(Runnable runnable) {            if (mExecutor != null) {                mExecutor.getQueue().remove(runnable);            }        }    }}

默认执行的控制

 ThreadManager.getInstance().execute(new MyRunnable(url, request, executeevent));

代码注释比较详细有什么不明白的地方欢迎提问

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