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| | | package safeluck.drive.evaluation.util; |
| | | |
| | | |
| | | import android.os.Handler; |
| | | import android.os.Looper; |
| | | import android.util.Log; |
| | | |
| | | import java.util.HashMap; |
| | | import java.util.Iterator; |
| | | import java.util.Map; |
| | | import java.util.concurrent.Callable; |
| | | import java.util.concurrent.ExecutorService; |
| | | import java.util.concurrent.Executors; |
| | | import java.util.concurrent.Future; |
| | | import java.util.concurrent.LinkedBlockingQueue; |
| | | import java.util.concurrent.ThreadFactory; |
| | | import java.util.concurrent.ThreadPoolExecutor; |
| | | import java.util.concurrent.TimeUnit; |
| | | import java.util.concurrent.atomic.AtomicInteger; |
| | | |
| | | /** |
| | | * MyApplication2 |
| | | * Created by lzw on 2019/12/12. 16:22:49 |
| | | * 邮箱:632393724@qq.com |
| | | * All Rights Saved! Chongqing AnYun Tech co. LTD |
| | | * |
| | | * * |
| | | * * <p>@ClassName: CThreadPoolExecutor.java</p> |
| | | * * <b> |
| | | * * <p>@Description: 自定义固定大小的线程池 |
| | | * * 每次提交一个任务就创建一个线程,直到线程达到线程池的最大大小。 |
| | | * * 线程池的大小一旦达到最大值就会保持不变,如果某个线程因为执行异常而结束,那么线程池会补充一个新线程。 |
| | | * * <p> |
| | | * * 合理利用线程池能够带来三个好处: |
| | | * * 第一:降低资源消耗。通过重复利用已创建的线程降低线程创建和销毁造成的消耗。 |
| | | * * 第二:提高响应速度。当任务到达时,任务可以不需要等到线程创建就能立即执行。 |
| | | * * 第三:提高线程的可管理性。线程是稀缺资源,如果无限制的创建,不仅会消耗系统资源,还会降低系统的稳定性,使用线程池可以进行统一的分配,调优和监控。 |
| | | * * 我们可以通过ThreadPoolExecutor来创建一个线程池: |
| | | * * new ThreadPoolExecutor(corePoolSize, maximumPoolSize, keepAliveTime, milliseconds,runnableTaskQueue, handler); |
| | | * * <p> |
| | | * * corePoolSize(线程池的基本大小): |
| | | * * 当提交一个任务到线程池时,线程池会创建一个线程来执行任务, |
| | | * * 即使其他空闲的基本线程能够执行新任务也会创建线程,等到需要执行的任务数大于线程池基本大小时就不再创建。 |
| | | * * 如果调用了线程池的prestartAllCoreThreads方法,线程池会提前创建并启动所有基本线程。 |
| | | * * <p> |
| | | * * runnableTaskQueue(任务队列):用于保存等待执行的任务的阻塞队列。 可以选择以下几个阻塞队列。 |
| | | * * ArrayBlockingQueue:是一个基于数组结构的有界阻塞队列,此队列按 FIFO(先进先出)原则对元素进行排序。 |
| | | * * <p> |
| | | * * LinkedBlockingQueue:一个基于链表结构的阻塞队列,此队列按FIFO (先进先出) 排序元素,吞吐量通常要高于ArrayBlockingQueue。 |
| | | * * 静态工厂方法Executors.newFixedThreadPool()使用了这个队列。 |
| | | * * <p> |
| | | * * SynchronousQueue:一个不存储元素的阻塞队列。每个插入操作必须等到另一个线程调用移除操作,否则插入操作一直处于阻塞状态, |
| | | * * 吞吐量通常要高于LinkedBlockingQueue,静态工厂方法Executors.newCachedThreadPool使用了这个队列。 |
| | | * * <p> |
| | | * * PriorityBlockingQueue:一个具有优先级的无限阻塞队列。 |
| | | * * <p> |
| | | * * maximumPoolSize(线程池最大大小): |
| | | * * 线程池允许创建的最大线程数。如果队列满了,并且已创建的线程数小于最大线程数,则线程池会再创建新的线程执行任务。值得注意的是如果使用了无界的任务队列这个参数就没什么效果。 |
| | | * * <p> |
| | | * * ThreadFactory: |
| | | * * 用于设置创建线程的工厂,可以通过线程工厂给每个创建出来的线程设置更有意义的名字。 |
| | | * * <p> |
| | | * * RejectedExecutionHandler(饱和策略):当队列和线程池都满了,说明线程池处于饱和状态,那么必须采取一种策略处理提交的新任务。 |
| | | * * 这个策略默认情况下是AbortPolicy,表示无法处理新任务时抛出异常。以下是JDK1.5提供的四种策略。 |
| | | * * AbortPolicy:直接抛出异常。 |
| | | * * CallerRunsPolicy:只用调用者所在线程来运行任务。 |
| | | * * DiscardOldestPolicy:丢弃队列里最近的一个任务,并执行当前任务。 |
| | | * * DiscardPolicy:不处理,丢弃掉。 |
| | | * * 当然也可以根据应用场景需要来实现RejectedExecutionHandler接口自定义策略。如记录日志或持久化不能处理的任务。 |
| | | * * <p> |
| | | * * keepAliveTime(线程活动保持时间):线程池的工作线程空闲后,保持存活的时间。 |
| | | * * 所以如果任务很多,并且每个任务执行的时间比较短,可以调大这个时间,提高线程的利用率。 |
| | | * * <p> |
| | | * * TimeUnit(线程活动保持时间的单位):可选的单位有天(DAYS),小时(HOURS),分钟(MINUTES), |
| | | * * 毫秒(MILLISECONDS),微秒(MICROSECONDS, 千分之一毫秒)和毫微秒(NANOSECONDS, 千分之一微秒)。</p> |
| | | * * </b> |
| | | * * <p>@author: FreddyChen</p> |
| | | * * <p>@date: 2019/2/3 15:35</p> |
| | | * * <p>@email: chenshichao@outlook.com</p> |
| | | * * |
| | | * * @see http://www.infoq.com/cn/articles/java-threadPool |
| | | * |
| | | */ |
| | | public class CThreadPoolExecutor { |
| | | private static final String TAG = CThreadPoolExecutor.class.getSimpleName(); |
| | | private static final int CPU_COUNT = Runtime.getRuntime().availableProcessors();// CPU个数 |
| | | // private static final int CORE_POOL_SIZE = CPU_COUNT + 1;// 线程池中核心线程的数量 |
| | | // private static final int MAXIMUM_POOL_SIZE = 2 * CPU_COUNT + 1;// 线程池中最大线程数量 |
| | | private static final int CORE_POOL_SIZE = Math.max(2, Math.min(CPU_COUNT - 1, 4));// 线程池中核心线程的数量 |
| | | private static final int MAXIMUM_POOL_SIZE = CPU_COUNT * 2 + 1;// 线程池中最大线程数量 |
| | | private static final long KEEP_ALIVE_TIME = 30L;// 非核心线程的超时时长,当系统中非核心线程闲置时间超过keepAliveTime之后,则会被回收。如果ThreadPoolExecutor的allowCoreThreadTimeOut属性设置为true,则该参数也表示核心线程的超时时长 |
| | | private static final int WAIT_COUNT = 128; // 最多排队个数,这里控制线程创建的频率 |
| | | |
| | | private static ThreadPoolExecutor pool = createThreadPoolExecutor(); |
| | | |
| | | private static ThreadPoolExecutor createThreadPoolExecutor() { |
| | | if (pool == null) { |
| | | pool = new ThreadPoolExecutor( |
| | | CORE_POOL_SIZE, |
| | | MAXIMUM_POOL_SIZE, |
| | | KEEP_ALIVE_TIME, |
| | | TimeUnit.SECONDS, |
| | | new LinkedBlockingQueue<Runnable>(WAIT_COUNT), |
| | | new CThreadFactory("CThreadPool", Thread.NORM_PRIORITY - 2), |
| | | new CHandlerException()); |
| | | } |
| | | |
| | | return pool; |
| | | } |
| | | |
| | | public static class CThreadFactory implements ThreadFactory { |
| | | private AtomicInteger counter = new AtomicInteger(1); |
| | | private String prefix = ""; |
| | | private int priority = Thread.NORM_PRIORITY; |
| | | |
| | | public CThreadFactory(String prefix, int priority) { |
| | | this.prefix = prefix; |
| | | this.priority = priority; |
| | | } |
| | | |
| | | public CThreadFactory(String prefix) { |
| | | this.prefix = prefix; |
| | | } |
| | | |
| | | public Thread newThread(Runnable r) { |
| | | Thread executor = new Thread(r, prefix + " #" + counter.getAndIncrement()); |
| | | executor.setDaemon(true); |
| | | executor.setPriority(priority); |
| | | return executor; |
| | | } |
| | | } |
| | | |
| | | /** |
| | | * 抛弃当前的任务 |
| | | */ |
| | | private static class CHandlerException extends ThreadPoolExecutor.AbortPolicy { |
| | | |
| | | @Override |
| | | public void rejectedExecution(Runnable r, ThreadPoolExecutor e) { |
| | | Log.d(TAG, "rejectedExecution:" + r); |
| | | Log.e(TAG, logAllThreadStackTrace().toString()); |
| | | // Tips.showForce("任务被拒绝", 5000); |
| | | if (!pool.isShutdown()) { |
| | | pool.shutdown(); |
| | | pool = null; |
| | | } |
| | | |
| | | pool = createThreadPoolExecutor(); |
| | | } |
| | | } |
| | | |
| | | private static ExecutorService jobsForUI = Executors.newFixedThreadPool( |
| | | CORE_POOL_SIZE, new CThreadFactory("CJobsForUI", Thread.NORM_PRIORITY - 1)); |
| | | |
| | | /** |
| | | * 启动一个消耗线程,常驻后台 |
| | | * |
| | | * @param r |
| | | */ |
| | | public static void startConsumer(final Runnable r, final String name) { |
| | | runInBackground(new Runnable() { |
| | | public void run() { |
| | | new CThreadFactory(name, Thread.NORM_PRIORITY - 3).newThread(r).start(); |
| | | } |
| | | }); |
| | | } |
| | | |
| | | /** |
| | | * 提交到其他线程去跑,需要取数据的时候会等待任务完成再继续 |
| | | * |
| | | * @param task |
| | | * @return |
| | | */ |
| | | public static <T> Future<T> submitTask(Callable<T> task) { |
| | | return jobsForUI.submit(task); |
| | | } |
| | | |
| | | /** |
| | | * 强制清理任务 |
| | | * |
| | | * @param task |
| | | * @return |
| | | */ |
| | | public static <T> void cancelTask(Future<T> task) { |
| | | if (task != null) { |
| | | task.cancel(true); |
| | | } |
| | | } |
| | | |
| | | /** |
| | | * 从 Future 中获取值,如果发生异常,打日志 |
| | | * |
| | | * @param future |
| | | * @param tag |
| | | * @param name |
| | | * @return |
| | | */ |
| | | public static <T> T getFromTask(Future<T> future, String tag, String name) { |
| | | try { |
| | | return future.get(); |
| | | } catch (Exception e) { |
| | | Log.e(tag, (name != null ? name + ": " : "") + e.toString()); |
| | | } |
| | | return null; |
| | | } |
| | | |
| | | public static void runInBackground(Runnable runnable) { |
| | | if (pool == null) { |
| | | createThreadPoolExecutor(); |
| | | } |
| | | |
| | | pool.execute(runnable); |
| | | // Future future = pool.submit(runnable); |
| | | // try { |
| | | // future.get(); |
| | | // } catch (InterruptedException e) { |
| | | // e.printStackTrace(); |
| | | // } catch (ExecutionException e) { |
| | | // e.printStackTrace(); |
| | | // } |
| | | } |
| | | |
| | | private static Thread mainThread; |
| | | private static Handler mainHandler; |
| | | |
| | | static { |
| | | Looper mainLooper = Looper.getMainLooper(); |
| | | mainThread = mainLooper.getThread(); |
| | | mainHandler = new Handler(mainLooper); |
| | | } |
| | | |
| | | public static boolean isOnMainThread() { |
| | | return mainThread == Thread.currentThread(); |
| | | } |
| | | |
| | | public static void runOnMainThread(Runnable r) { |
| | | if (isOnMainThread()) { |
| | | r.run(); |
| | | } else { |
| | | mainHandler.post(r); |
| | | } |
| | | } |
| | | |
| | | public static void runOnMainThread(Runnable r, long delayMillis) { |
| | | if (delayMillis <= 0) { |
| | | runOnMainThread(r); |
| | | } else { |
| | | mainHandler.postDelayed(r, delayMillis); |
| | | } |
| | | } |
| | | |
| | | // 用于记录后台等待的Runnable,第一个参数外面的Runnable,第二个参数是等待中的Runnable |
| | | private static HashMap<Runnable, Runnable> mapToMainHandler = new HashMap<Runnable, Runnable>(); |
| | | |
| | | public static void runInBackground(final Runnable runnable, long delayMillis) { |
| | | if (delayMillis <= 0) { |
| | | runInBackground(runnable); |
| | | } else { |
| | | Runnable mainRunnable = new Runnable() { |
| | | |
| | | @Override |
| | | public void run() { |
| | | mapToMainHandler.remove(runnable); |
| | | pool.execute(runnable); |
| | | } |
| | | }; |
| | | |
| | | mapToMainHandler.put(runnable, mainRunnable); |
| | | mainHandler.postDelayed(mainRunnable, delayMillis); |
| | | } |
| | | } |
| | | |
| | | /** |
| | | * 对runOnMainThread的,移除Runnable |
| | | * |
| | | * @param r |
| | | */ |
| | | public static void removeCallbackOnMainThread(Runnable r) { |
| | | mainHandler.removeCallbacks(r); |
| | | } |
| | | |
| | | public static void removeCallbackInBackground(Runnable runnable) { |
| | | Runnable mainRunnable = mapToMainHandler.get(runnable); |
| | | if (mainRunnable != null) { |
| | | mainHandler.removeCallbacks(mainRunnable); |
| | | } |
| | | } |
| | | |
| | | public static void logStatus() { |
| | | StringBuilder sb = new StringBuilder(); |
| | | sb.append("getActiveCount"); |
| | | sb.append(pool.getActiveCount()); |
| | | sb.append("\ngetTaskCount"); |
| | | sb.append(pool.getTaskCount()); |
| | | sb.append("\ngetCompletedTaskCount"); |
| | | sb.append(pool.getCompletedTaskCount()); |
| | | Log.d(TAG, sb.toString()); |
| | | } |
| | | |
| | | public static StringBuilder logAllThreadStackTrace() { |
| | | StringBuilder builder = new StringBuilder(); |
| | | Map<Thread, StackTraceElement[]> liveThreads = Thread.getAllStackTraces(); |
| | | for (Iterator<Thread> i = liveThreads.keySet().iterator(); i.hasNext(); ) { |
| | | Thread key = i.next(); |
| | | builder.append("Thread ").append(key.getName()) |
| | | .append("\n"); |
| | | StackTraceElement[] trace = liveThreads.get(key); |
| | | for (int j = 0; j < trace.length; j++) { |
| | | builder.append("\tat ").append(trace[j]).append("\n"); |
| | | } |
| | | } |
| | | return builder; |
| | | } |
| | | |
| | | public static void main(String[] args) { |
| | | for (int i = 0; i < 10000; i++) { |
| | | final int index = i; |
| | | System.out.println("index=" + index); |
| | | CThreadPoolExecutor.runInBackground(new Runnable() { |
| | | @Override |
| | | public void run() { |
| | | System.out.println("正在运行第[" + (index + 1) + "]个线程."); |
| | | } |
| | | }); |
| | | try { |
| | | Thread.sleep(10); |
| | | } catch (InterruptedException e) { |
| | | e.printStackTrace(); |
| | | } |
| | | } |
| | | } |
| | | } |