java系列之线程池

谁践踏了优雅 2024-03-27 16:50 86阅读 0赞

线程池工具类

import org.apache.curator.shaded.com.google.common.util.concurrent.ThreadFactoryBuilder;
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    
    import java.util.ArrayList;
    import java.util.List;
    import java.util.concurrent.*;
    import java.util.concurrent.atomic.AtomicInteger;
    
    
    /**
     * @author yang
     * @version v1.0
     * @date 2023/2/7 15:28
     * @description 线程池工具类
     */
    public class ThreadPoolUtils {
        private static final Logger log = LoggerFactory.getLogger(ThreadPoolUtils.class);
        /**
         * ExecutorService 线程池
         * 使用方式一  ThreadPoolUtils.submit();
         */
        private static ExecutorService pool = null;
    
        /*初始化线程池*/
        public static void init() {
            if (pool == null) {
                ThreadFactory namedThreadFactory = new ThreadFactoryBuilder().setNameFormat("thread-call-runner-%d").build();
                pool = new ThreadPoolExecutor(5, 200, 0L, TimeUnit.MILLISECONDS, new LinkedBlockingQueue<Runnable>(1024), namedThreadFactory, new ThreadPoolExecutor.AbortPolicy());
            }
        }
    
        /**
         * 提交任务执行
         *
         * @param r
         * @return void
         * @throws
         * @author dfd
         * @date 2021/3/18 13:51
         */
        public static void submit(Runnable r) {
            init();
            pool.execute(r);
        }
    
        /**
         * 关闭线程池
         *
         * @param
         * @return void
         * @throws
         * @author dfd
         * @date 2021/3/18 13:50
         */
        public static void unInit() {
            if (pool == null || pool.isShutdown()) {
                return;
            }
            pool.shutdownNow();
            pool = null;
        }
    
        /**
         * ThreadPoolExecutor-线程池 可记录线程执行详情
         * 使用方式二  ThreadPoolUtils pool = new ThreadPoolUtils(5,5,10, "A业务线程池");
         * pool.execute()
         */
        private ThreadPoolExecutor executor;
        /**
         * 线程工厂
         */
        private CustomThreadFactory threadFactory;
        /**
         * 异步执行结果
         */
        private List<CompletableFuture<Void>> completableFutures;
        /**
         * 拒绝策略
         */
        private CustomAbortPolicy abortPolicy;
        /**
         * 失败数量
         */
        private AtomicInteger failedCount;
        /**
         *
         * @param corePoolSize 核心线程数大小，当线程数< corePoolSize ，会创建线程执行runnable
         * @param maximumPoolSize 最大线程数， 当线程数 >= corePoolSize的时候，会把runnable放入workQueue中
         *  keepAliveTime  保持存活时间，当线程数大于corePoolSize的空闲线程能保持的最大时间
         * unit 时间单位
         * @param queueSize 阻塞队列，存放来不及执行的线程
         *         ArrayBlockingQueue：构造函数一定要传大小
         *         LinkedBlockingQueue：构造函数不传大小会默认为（Integer.MAX_VALUE ），当大量请求任务时，容易造成 内存耗尽。
         *         SynchronousQueue：同步队列，一个没有存储空间的阻塞队列 ，将任务同步交付给工作线程。
         *         PriorityBlockingQueue : 优先队列
         * @param poolName 创建线程的名字
         *  handler  拒绝策略
         * @return
         * @author  dfd
         * @date    2022/2/8 10:41
         * @throws
         */
        public ThreadPoolUtils(int corePoolSize,
                               int maximumPoolSize,
                               int queueSize,
                               String poolName) {
            this.failedCount = new AtomicInteger(0);
            this.abortPolicy = new CustomAbortPolicy();
            this.completableFutures = new ArrayList<>();
            this.threadFactory = new CustomThreadFactory(poolName);
            this.executor = new ThreadPoolExecutor(corePoolSize, maximumPoolSize, 60L, TimeUnit.SECONDS, new ArrayBlockingQueue<>(queueSize), this.threadFactory, abortPolicy);
        }
    
        /**
         * 执行任务
         *
         * @param runnable
         */
        public void execute(Runnable runnable) {
            CompletableFuture<Void> future = CompletableFuture.runAsync(runnable, executor);
            // 设置好异常情况
            future.exceptionally(e -> {
                failedCount.incrementAndGet();
                log.error("Task Failed..." + e);
                e.printStackTrace();
                return null;
            });
            // 任务结果列表
            completableFutures.add(future);
        }
    
        /**
         * 执行自定义runnable接口（可省略，只是加了个获取taskName）
         *
         * @param runnable
         */
        public void execute(SimpleTask runnable) {
            CompletableFuture<Void> future = CompletableFuture.runAsync(runnable, executor);
            // 设置好异常情况
            future.exceptionally(e -> {
                failedCount.incrementAndGet();
                log.error("Task [" + runnable.taskName + "] Failed..." + e);
                e.printStackTrace();
                return null;
            });
            // 任务结果列表
            completableFutures.add(future);
        }
    
        /**
         * 停止线程池
         */
        public void shutdown() {
            executor.shutdown();
            log.debug("************************停止线程池************************");
            log.debug("** 活动线程数：" + executor.getActiveCount() + "\t\t\t\t\t\t\t\t\t\t**");
            log.debug("** 等待任务数：" + executor.getQueue().size() + "\t\t\t\t\t\t\t\t\t\t**");
            log.debug("** 完成任务数：" + executor.getCompletedTaskCount() + "\t\t\t\t\t\t\t\t\t\t**");
            log.debug("** 全部任务数：" + executor.getTaskCount() + "\t\t\t\t\t\t\t\t\t\t**");
            log.debug("** 拒绝任务数：" + abortPolicy.getRejectCount() + "\t\t\t\t\t\t\t\t\t\t**");
            log.debug("** 成功任务数：" + (executor.getCompletedTaskCount() - failedCount.get()) + "\t\t\t\t\t\t\t\t\t\t**");
            log.debug("** 异常任务数：" + failedCount.get() + "\t\t\t\t\t\t\t\t\t\t**");
            log.debug("**********************************************************");
        }
    
        /**
         * 获取任务执行情况
         * 之所以遍历taskCount数的CompletableFuture，是因为如果有拒绝的任务，相应的CompletableFuture也会放进列表，而这种CompletableFuture调用get方法，是会永远阻塞的。
         *
         * @return
         */
        public boolean getExecuteResult() {
            // 任务数，不包含拒绝的任务
            long taskCount = executor.getTaskCount();
            for (int i = 0; i < taskCount; i++) {
                CompletableFuture<Void> future = completableFutures.get(i);
                try {
                    // 获取结果，这个是同步的，目的是获取真实的任务完成情况
                    future.get();
                } catch (InterruptedException | ExecutionException e) {
                    // log.error("java.util.concurrent.CompletableFuture.get() Failed ..." + e);
                    return false;
                }
                // 出现异常，false
                if (future.isCompletedExceptionally()) {
                    return false;
                }
            }
            return true;
        }
    
        /**
         * 线程工厂
         */
        private static class CustomThreadFactory implements ThreadFactory {
            private String poolName;
            private AtomicInteger count;
    
            private CustomThreadFactory(String poolName) {
                this.poolName = poolName;
                this.count = new AtomicInteger(0);
            }
    
            @Override
            public Thread newThread(Runnable r) {
                Thread thread = new Thread(r);
                // 线程名，利于排查
                thread.setName(poolName + "-[线程" + count.incrementAndGet() + "]");
                return thread;
            }
        }
    
        /**
         * 自定义拒绝策略
         */
        private static class CustomAbortPolicy implements RejectedExecutionHandler {
            /**
             * 拒绝的任务数
             */
            private AtomicInteger rejectCount;
    
            private CustomAbortPolicy() {
                this.rejectCount = new AtomicInteger(0);
            }
    
            private AtomicInteger getRejectCount() {
                return rejectCount;
            }
    
            /**
             * 这个方法，如果不抛异常，则执行此任务的线程会一直阻塞
             *
             * @param r
             * @param e
             */
            @Override
            public void rejectedExecution(Runnable r, ThreadPoolExecutor e) {
                log.error("Task " + r.toString() +
                        " rejected from " +
                        e.toString() + " 累计：" + rejectCount.incrementAndGet());
            }
        }
    
        /**
         * 只是加了个taskName，可自行实现更加复杂的逻辑
         */
        public abstract static class SimpleTask implements Runnable {
            /**
             * 任务名称
             */
            private String taskName;
    
            public void setTaskName(String taskName) {
                this.taskName = taskName;
            }
        }
    }

位置调用

public static void main(String[] args) {
     
    //异步进行通道开户  配置线程池参数
                        ThreadPoolUtils pool = new ThreadPoolUtils(5,200,10, "合同审核通过---->进行通道开户");
    
                       //进行调用         
                   pool.execute(new AppearThread(mmContractInfoParam.getCustomerCode()));
    }
    
    
    public class AppearThread implements Runnable{
    
            private String customerCode;
    
            public AppearThread(String customerCode) {
                this.customerCode = customerCode;
            }
            @Override
            public void run() {
                //执行具体方法
                importMerchant(customerCode);
            }
        }