| /* |
| * |
| * 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 com.baidu.hugegraph.concurrent; |
| |
| import java.util.concurrent.TimeUnit; |
| import java.util.concurrent.locks.Condition; |
| import java.util.concurrent.locks.Lock; |
| import java.util.concurrent.locks.ReentrantLock; |
| |
| import com.baidu.hugegraph.util.E; |
| |
| public class BarrierEvent { |
| |
| private final Lock lock = new ReentrantLock(); |
| private final Condition cond = lock.newCondition(); |
| private volatile boolean signaled = false; |
| |
| /** |
| * Wait forever until the signal is received. |
| * @throws InterruptedException if interrupted. |
| */ |
| public void await() throws InterruptedException { |
| this.lock.lock(); |
| try { |
| while (!this.signaled) { |
| this.cond.await(); |
| } |
| } finally { |
| this.lock.unlock(); |
| } |
| } |
| |
| /** |
| * Wait specified time in milliseconds. |
| * @param timeout: the time in millisecond to wait. |
| * @return true if signal is received, false if time out. |
| * @throws InterruptedException if interrupted. |
| */ |
| public boolean await(long timeout) throws InterruptedException { |
| E.checkArgument(timeout >= 0L, |
| "The time must be >= 0, but got '%d'.", |
| timeout); |
| long deadline = System.currentTimeMillis() + timeout; |
| this.lock.lock(); |
| try { |
| while (!this.signaled) { |
| timeout = deadline - System.currentTimeMillis(); |
| if (timeout > 0) { |
| this.cond.await(timeout, TimeUnit.MILLISECONDS); |
| } |
| if (System.currentTimeMillis() >= deadline) { |
| return this.signaled; |
| } |
| } |
| } finally { |
| this.lock.unlock(); |
| } |
| return true; |
| } |
| |
| public void reset() { |
| this.lock.lock(); |
| try { |
| this.signaled = false; |
| } finally { |
| this.lock.unlock(); |
| } |
| } |
| |
| public void signal() { |
| this.lock.lock(); |
| try { |
| this.signaled = true; |
| this.cond.signal(); |
| } finally { |
| this.lock.unlock(); |
| } |
| } |
| |
| public void signalAll() { |
| this.lock.lock(); |
| try { |
| this.signaled = true; |
| this.cond.signalAll(); |
| } finally { |
| this.lock.unlock(); |
| } |
| } |
| } |