| /* |
| * Copyright 2017 HugeGraph Authors |
| * |
| * 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.hugegraph.concurrent; |
| |
| import java.util.List; |
| import java.util.concurrent.ScheduledThreadPoolExecutor; |
| import java.util.concurrent.ThreadFactory; |
| |
| import org.apache.hugegraph.util.Log; |
| import org.slf4j.Logger; |
| |
| public class PausableScheduledThreadPool extends ScheduledThreadPoolExecutor { |
| |
| private static final Logger LOG = Log.logger(PausableScheduledThreadPool.class); |
| |
| private volatile boolean paused = false; |
| |
| public PausableScheduledThreadPool(int corePoolSize, |
| ThreadFactory factory) { |
| super(corePoolSize, factory); |
| } |
| |
| public synchronized void pauseSchedule() { |
| this.paused = true; |
| LOG.info("PausableScheduledThreadPool was paused"); |
| } |
| |
| public synchronized void resumeSchedule() { |
| this.paused = false; |
| this.notifyAll(); |
| LOG.info("PausableScheduledThreadPool was resumed"); |
| } |
| |
| @Override |
| protected void beforeExecute(Thread t, Runnable r) { |
| synchronized (this) { |
| while (this.paused) { |
| try { |
| this.wait(); |
| } catch (InterruptedException e) { |
| LOG.warn("PausableScheduledThreadPool was interrupted"); |
| } |
| } |
| } |
| super.beforeExecute(t, r); |
| } |
| |
| @Override |
| public void shutdown() { |
| if (this.paused) { |
| this.resumeSchedule(); |
| } |
| super.shutdown(); |
| } |
| |
| @Override |
| public List<Runnable> shutdownNow() { |
| if (this.paused) { |
| this.resumeSchedule(); |
| } |
| return super.shutdownNow(); |
| } |
| } |