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 */ 25 package org.slf4j.profiler; 26 27 import java.text.DecimalFormat; 28 29 /** 30 * 31 * A collection of utility methods. 32 * 33 * @author Ceki Gülcü 34 * 35 */ 36 class Util { 37 38 static final long NANOS_IN_ONE_MICROSECOND = 1000; 39 static final long NANOS_IN_ONE_MILLISECOND = NANOS_IN_ONE_MICROSECOND * 1000; 40 static final long NANOS_IN_ONE_SECOND = NANOS_IN_ONE_MILLISECOND * 1000; 41 private static final DecimalFormat DECIMAL_FORMAT = new DecimalFormat("0.000"); 42 selectDurationUnitForDisplay(StopWatch sw)43 static DurationUnit selectDurationUnitForDisplay(StopWatch sw) { 44 return selectDurationUnitForDisplay(sw.elapsedTime()); 45 } 46 selectDurationUnitForDisplay(long durationInNanos)47 static DurationUnit selectDurationUnitForDisplay(long durationInNanos) { 48 if (durationInNanos < 10 * NANOS_IN_ONE_MICROSECOND) { 49 return DurationUnit.NANOSECOND; 50 } else if (durationInNanos < 10 * NANOS_IN_ONE_MILLISECOND) { 51 return DurationUnit.MICROSECOND; 52 } else if (durationInNanos < 10 * NANOS_IN_ONE_SECOND) { 53 return DurationUnit.MILLISSECOND; 54 } else { 55 return DurationUnit.SECOND; 56 } 57 } 58 convertToMicros(long nanos)59 static public double convertToMicros(long nanos) { 60 return (double) nanos / NANOS_IN_ONE_MICROSECOND; 61 } 62 convertToMillis(long nanos)63 static public double convertToMillis(long nanos) { 64 return (double) nanos / NANOS_IN_ONE_MILLISECOND; 65 } 66 convertToSeconds(long nanos)67 static public double convertToSeconds(long nanos) { 68 return ((double) nanos / NANOS_IN_ONE_SECOND); 69 } 70 durationInDurationUnitsAsStr(StringBuilder buf, StopWatch sw)71 static String durationInDurationUnitsAsStr(StringBuilder buf, StopWatch sw) { 72 DurationUnit du = selectDurationUnitForDisplay(sw); 73 return durationInDurationUnitsAsStr(sw.elapsedTime(), du); 74 } 75 durationInDurationUnitsAsStr(long nanos, DurationUnit durationUnit)76 static String durationInDurationUnitsAsStr(long nanos, DurationUnit durationUnit) { 77 StringBuilder buf = new StringBuilder(); 78 switch (durationUnit) { 79 case NANOSECOND: 80 buf.append(nanos); 81 break; 82 case MICROSECOND: 83 double micros = convertToMicros(nanos); 84 buf.append(DECIMAL_FORMAT.format(micros)); 85 break; 86 case MILLISSECOND: 87 double millis = convertToMillis(nanos); 88 buf.append(DECIMAL_FORMAT.format(millis)); 89 break; 90 case SECOND: 91 double seconds = convertToSeconds(nanos); 92 buf.append(DECIMAL_FORMAT.format(seconds)); 93 break; 94 } 95 return buf.toString(); 96 } 97 appendDurationUnitAsStr(StringBuilder buf, DurationUnit durationUnit)98 static void appendDurationUnitAsStr(StringBuilder buf, DurationUnit durationUnit) { 99 switch (durationUnit) { 100 case NANOSECOND: 101 buf.append("nanoseconds."); 102 break; 103 case MICROSECOND: 104 buf.append("microseconds."); 105 break; 106 case MILLISSECOND: 107 buf.append("milliseconds."); 108 break; 109 case SECOND: 110 buf.append(" seconds."); 111 break; 112 } 113 } 114 } 115