| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.hadoop.hdds.utils; |
| |
| import org.apache.ratis.util.function.CheckedRunnable; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.util.concurrent.Executors; |
| import java.util.concurrent.ScheduledExecutorService; |
| import java.util.concurrent.TimeUnit; |
| |
| /** |
| * This class encapsulates ScheduledExecutorService. |
| */ |
| public class Scheduler { |
| |
| private static final Logger LOG = |
| LoggerFactory.getLogger(Scheduler.class); |
| |
| private ScheduledExecutorService scheduler; |
| |
| private volatile boolean isClosed; |
| |
| private String threadName; |
| |
| /** |
| * Creates a ScheduledExecutorService based on input arguments. |
| * @param threadName - thread name |
| * @param isDaemon - if true the threads in the scheduler are started as |
| * daemon |
| * @param numCoreThreads - number of core threads to maintain in the scheduler |
| */ |
| public Scheduler(String threadName, boolean isDaemon, int numCoreThreads) { |
| scheduler = Executors.newScheduledThreadPool(numCoreThreads, r -> { |
| Thread t = new Thread(r); |
| t.setName(threadName); |
| t.setDaemon(isDaemon); |
| return t; |
| }); |
| this.threadName = threadName; |
| isClosed = false; |
| } |
| |
| public void schedule(Runnable runnable, long delay, TimeUnit timeUnit) { |
| scheduler.schedule(runnable, delay, timeUnit); |
| } |
| |
| public void schedule(CheckedRunnable runnable, long delay, |
| TimeUnit timeUnit, Logger logger, String errMsg) { |
| scheduler.schedule(() -> { |
| try { |
| runnable.run(); |
| } catch (Throwable throwable) { |
| logger.error(errMsg, throwable); |
| } |
| }, delay, timeUnit); |
| } |
| |
| public void scheduleWithFixedDelay(Runnable runnable, long initialDelay, |
| long fixedDelay, TimeUnit timeUnit) { |
| scheduler |
| .scheduleWithFixedDelay(runnable, initialDelay, fixedDelay, timeUnit); |
| } |
| |
| public boolean isClosed() { |
| return isClosed; |
| } |
| |
| /** |
| * Closes the scheduler for further task submission. Any pending tasks not |
| * yet executed are also cancelled. For the executing tasks the scheduler |
| * waits 60 seconds for completion. |
| */ |
| public synchronized void close() { |
| isClosed = true; |
| if (scheduler != null) { |
| scheduler.shutdownNow(); |
| try { |
| scheduler.awaitTermination(60, TimeUnit.SECONDS); |
| } catch (InterruptedException e) { |
| LOG.info( |
| threadName + " interrupted while waiting for task completion {}", |
| e); |
| } |
| } |
| scheduler = null; |
| } |
| } |