Util xref

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    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 G&uuml;lc&uuml;
    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
    43    static DurationUnit selectDurationUnitForDisplay(StopWatch sw) {
    44      return selectDurationUnitForDisplay(sw.elapsedTime());
    45    }
    46
    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
    59    static public double convertToMicros(long nanos) {
    60      return (double) nanos / NANOS_IN_ONE_MICROSECOND;
    61    }
    62
    63    static public double convertToMillis(long nanos) {
    64      return (double) nanos / NANOS_IN_ONE_MILLISECOND;
    65    }
    66
    67    static public double convertToSeconds(long nanos) {
    68      return ((double) nanos / NANOS_IN_ONE_SECOND);
    69    }
    70
    71    static String durationInDurationUnitsAsStr(StringBuffer buf, StopWatch sw) {
    72      DurationUnit du = selectDurationUnitForDisplay(sw);
    73      return durationInDurationUnitsAsStr(sw.elapsedTime(), du);
    74    }
    75
    76    static String durationInDurationUnitsAsStr(long nanos, DurationUnit durationUnit) {
    77      StringBuffer buf = new StringBuffer();
    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
    98    static void appendDurationUnitAsStr(StringBuffer 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 }