1 /** 2 * Copyright (C) 2006 Google Inc. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.google.inject.internal.util; 18 19 import java.util.logging.Logger; 20 21 /** 22 * Enables simple performance monitoring. 23 * 24 * @author crazybob (at) google.com (Bob Lee) 25 */ 26 public final class Stopwatch { 27 private static final Logger logger = Logger.getLogger(Stopwatch.class.getName()); 28 29 private long start = System.currentTimeMillis(); 30 31 /** 32 * Resets and returns elapsed time in milliseconds. 33 */ 34 public long reset() { 35 long now = System.currentTimeMillis(); 36 try { 37 return now - start; 38 } finally { 39 start = now; 40 } 41 } 42 43 /** 44 * Resets and logs elapsed time in milliseconds. 45 */ 46 public void resetAndLog(String label) { 47 logger.fine(label + ": " + reset() + "ms"); 48 } 49 } 50
