| /* |
| * 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.solr.util; |
| |
| import java.util.concurrent.TimeUnit; |
| |
| /** A simple timer. |
| * |
| * RTimers are started automatically when instantiated. |
| * |
| * @since solr 1.3 |
| * |
| */ |
| public class RTimer { |
| |
| public static final int STARTED = 0; |
| public static final int STOPPED = 1; |
| public static final int PAUSED = 2; |
| |
| protected int state; |
| private TimerImpl timerImpl; |
| private double time; |
| private double culmTime; |
| |
| protected interface TimerImpl { |
| void start(); |
| double elapsed(); |
| } |
| |
| private static class NanoTimeTimerImpl implements TimerImpl { |
| private long start; |
| public void start() { |
| start = System.nanoTime(); |
| } |
| public double elapsed() { |
| return TimeUnit.MILLISECONDS.convert(System.nanoTime() - start, TimeUnit.NANOSECONDS); |
| } |
| } |
| |
| protected TimerImpl newTimerImpl() { |
| return new NanoTimeTimerImpl(); |
| } |
| |
| public RTimer() { |
| time = 0; |
| culmTime = 0; |
| timerImpl = newTimerImpl(); |
| timerImpl.start(); |
| state = STARTED; |
| } |
| |
| /** Stop this timer */ |
| public double stop() { |
| assert state == STARTED || state == PAUSED; |
| time = culmTime; |
| if(state == STARTED) |
| time += timerImpl.elapsed(); |
| state = STOPPED; |
| return time; |
| } |
| |
| public void pause() { |
| assert state == STARTED; |
| culmTime += timerImpl.elapsed(); |
| state = PAUSED; |
| } |
| |
| public void resume() { |
| if(state == STARTED) |
| return; |
| assert state == PAUSED; |
| state = STARTED; |
| timerImpl.start(); |
| } |
| |
| /** Get total elapsed time for this timer. */ |
| public double getTime() { |
| if (state == STOPPED) return time; |
| else if (state == PAUSED) return culmTime; |
| else { |
| assert state == STARTED; |
| return culmTime + timerImpl.elapsed(); |
| } |
| } |
| } |