| /** |
| * 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 backtype.storm.utils; |
| |
| import java.util.concurrent.atomic.AtomicLong; |
| import java.util.Map; |
| import java.util.concurrent.ConcurrentHashMap; |
| import java.util.concurrent.atomic.AtomicBoolean; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| public class Time { |
| public static Logger LOG = LoggerFactory.getLogger(Time.class); |
| |
| private static AtomicBoolean simulating = new AtomicBoolean(false); |
| // TODO: should probably use weak references here or something |
| private static volatile Map<Thread, AtomicLong> threadSleepTimes; |
| private static final Object sleepTimesLock = new Object(); |
| |
| private static AtomicLong simulatedCurrTimeMs; // should this be a thread local that's allowed to keep advancing? |
| |
| public static void startSimulating() { |
| synchronized (sleepTimesLock) { |
| simulating.set(true); |
| simulatedCurrTimeMs = new AtomicLong(0); |
| threadSleepTimes = new ConcurrentHashMap<Thread, AtomicLong>(); |
| } |
| } |
| |
| public static void stopSimulating() { |
| synchronized (sleepTimesLock) { |
| simulating.set(false); |
| threadSleepTimes = null; |
| } |
| } |
| |
| public static boolean isSimulating() { |
| return simulating.get(); |
| } |
| |
| public static void sleepUntil(long targetTimeMs) throws InterruptedException { |
| if (simulating.get()) { |
| try { |
| synchronized (sleepTimesLock) { |
| threadSleepTimes.put(Thread.currentThread(), new AtomicLong(targetTimeMs)); |
| } |
| while (simulatedCurrTimeMs.get() < targetTimeMs) { |
| Thread.sleep(10); |
| } |
| } finally { |
| synchronized (sleepTimesLock) { |
| if (simulating.get()) { |
| threadSleepTimes.remove(Thread.currentThread()); |
| } |
| } |
| } |
| } else { |
| long sleepTime = targetTimeMs - currentTimeMillis(); |
| if (sleepTime > 0) |
| Thread.sleep(sleepTime); |
| } |
| } |
| |
| public static void sleep(long ms) throws InterruptedException { |
| sleepUntil(currentTimeMillis() + ms); |
| } |
| |
| public static long currentTimeMillis() { |
| if (simulating.get()) { |
| return simulatedCurrTimeMs.get(); |
| } else { |
| return System.currentTimeMillis(); |
| } |
| } |
| |
| public static int currentTimeSecs() { |
| return (int) (currentTimeMillis() / 1000); |
| } |
| |
| public static void advanceTime(long ms) { |
| if (!simulating.get()) |
| throw new IllegalStateException("Cannot simulate time unless in simulation mode"); |
| simulatedCurrTimeMs.set(simulatedCurrTimeMs.get() + ms); |
| } |
| |
| public static boolean isThreadWaiting(Thread t) { |
| if (!simulating.get()) |
| throw new IllegalStateException("Must be in simulation mode"); |
| AtomicLong time; |
| synchronized (sleepTimesLock) { |
| time = threadSleepTimes.get(t); |
| } |
| return !t.isAlive() || time != null && currentTimeMillis() < time.longValue(); |
| } |
| } |