1/** 2 * Copyright (c) 2004-2011 QOS.ch 3 * All rights reserved. 4 * 5 * Permission is hereby granted, free of charge, to any person obtaining 6 * a copy of this software and associated documentation files (the 7 * "Software"), to deal in the Software without restriction, including 8 * without limitation the rights to use, copy, modify, merge, publish, 9 * distribute, sublicense, and/or sell copies of the Software, and to 10 * permit persons to whom the Software is furnished to do so, subject to 11 * the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be 14 * included in all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 17 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 18 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 19 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE 20 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 21 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 22 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 23 * 24 */ 25package org.slf4j.profiler; 26 27/** 28 * A very basic @{link TimeInstrument} which can be started and stopped 29 * once and only once. 30 * 31 * @author Ceki Gülcü 32 * 33 */ 34public class StopWatch implements TimeInstrument { 35 36 private String name; 37 private long startTime; 38 private long stopTime; 39 TimeInstrumentStatus status; 40 41 public StopWatch(String name) { 42 start(name); 43 } 44 45 StopWatch(StopWatch original) { 46 this.name = original.name; 47 this.startTime = original.startTime; 48 this.stopTime = original.stopTime; 49 this.status = original.status; 50 } 51 52 public void start(String name) { 53 this.name = name; 54 startTime = System.nanoTime(); 55 status = TimeInstrumentStatus.STARTED; 56 } 57 58 public String getName() { 59 return name; 60 } 61 62 public TimeInstrument stop() { 63 if (status == TimeInstrumentStatus.STOPPED) { 64 return this; 65 } 66 return stop(System.nanoTime()); 67 } 68 69 public StopWatch stop(long stopTime) { 70 this.status = TimeInstrumentStatus.STOPPED; 71 this.stopTime = stopTime; 72 return this; 73 } 74 75 @Override 76 public String toString() { 77 StringBuilder buf = new StringBuilder(); 78 buf.append("StopWatch ["); 79 buf.append(name); 80 buf.append("] "); 81 82 switch (status) { 83 case STARTED: 84 buf.append("STARTED"); 85 break; 86 case STOPPED: 87 buf.append("elapsed time: "); 88 buf.append(Util.durationInDurationUnitsAsStr(elapsedTime(), DurationUnit.MICROSECOND)); 89 break; 90 default: 91 throw new IllegalStateException("Status " + status + " is not expected"); 92 } 93 return buf.toString(); 94 } 95 96 public final long elapsedTime() { 97 if (status == TimeInstrumentStatus.STARTED) { 98 return 0; 99 } else { 100 return stopTime - startTime; 101 } 102 } 103 104 public TimeInstrumentStatus getStatus() { 105 return status; 106 } 107 108 public void print() { 109 System.out.println(toString()); 110 } 111 112 public void log() { 113 throw new UnsupportedOperationException("A stopwatch instance does not know how to log"); 114 } 115 116} 117