org.modeshape.common.statistic
Class Stopwatch

java.lang.Object
  extended by org.modeshape.common.statistic.Stopwatch
All Implemented Interfaces:
Comparable<Stopwatch>

@NotThreadSafe
public class Stopwatch
extends Object
implements Comparable<Stopwatch>

Provides a mechanism to measure time in the same way as a physical stopwatch.


Constructor Summary
Stopwatch()
           
Stopwatch(boolean detailedStats)
           
Stopwatch(boolean detailedStats, String description)
           
 
Method Summary
 int compareTo(Stopwatch that)
           
 Duration getAverageDuration()
          Get the average duration that this stopwatch has recorded.
 int getCount()
          Return the number of runs (complete starts and stops) this stopwatch has undergone.
 String getDescription()
           
 DetailedStatistics<Duration> getDetailedStatistics()
          Return this stopwatch's detailed statistics, if they are being kept.
 Histogram<Duration> getHistogram(int numSigmas)
          Return the histogram of this stopwatch's individual runs.
 Duration getMaximumDuration()
          Get the maximum duration that this stopwatch has recorded.
 Duration getMedianDuration()
          Get the median duration that this stopwatch has recorded.
 Duration getMinimumDuration()
          Get the minimum duration that this stopwatch has recorded.
 SimpleStatistics<Duration> getSimpleStatistics()
          Return this stopwatch's simple statistics.
 Duration getTotalDuration()
          Get the total duration that this stopwatch has recorded.
 boolean isDetailedStatistics()
          Return true if detailed statistics are being kept.
 boolean isRunning()
          Return whether this stopwatch is currently running.
 void reset()
          Reset this stopwatch and clear all statistics.
 void start()
          Start the stopwatch and begin recording the statistics a new run.
 void stop()
          Stop the stopwatch and record the statistics for the latest run.
 String toString()
           
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Constructor Detail

Stopwatch

public Stopwatch()

Stopwatch

public Stopwatch(boolean detailedStats)

Stopwatch

public Stopwatch(boolean detailedStats,
                 String description)
Method Detail

getDescription

public String getDescription()

start

public void start()
Start the stopwatch and begin recording the statistics a new run. This method does nothing if the stopwatch is already running

See Also:
isRunning()

stop

public void stop()
Stop the stopwatch and record the statistics for the latest run. This method does nothing if the stopwatch is not currently running

See Also:
isRunning()

getCount

public int getCount()
Return the number of runs (complete starts and stops) this stopwatch has undergone.

Returns:
the number of runs.
See Also:
isRunning()

isRunning

public boolean isRunning()
Return whether this stopwatch is currently running.

Returns:
true if running, or false if not

getTotalDuration

public Duration getTotalDuration()
Get the total duration that this stopwatch has recorded.

Returns:
the total duration, or an empty duration if this stopwatch has not been used since creation or being reset

getAverageDuration

public Duration getAverageDuration()
Get the average duration that this stopwatch has recorded.

Returns:
the average duration, or an empty duration if this stopwatch has not been used since creation or being reset

getMedianDuration

public Duration getMedianDuration()
Get the median duration that this stopwatch has recorded.

Returns:
the median duration, or an empty duration if this stopwatch has not been used since creation or being reset

getMinimumDuration

public Duration getMinimumDuration()
Get the minimum duration that this stopwatch has recorded.

Returns:
the total minimum, or an empty duration if this stopwatch has not been used since creation or being reset

getMaximumDuration

public Duration getMaximumDuration()
Get the maximum duration that this stopwatch has recorded.

Returns:
the maximum duration, or an empty duration if this stopwatch has not been used since creation or being reset

getSimpleStatistics

public SimpleStatistics<Duration> getSimpleStatistics()
Return this stopwatch's simple statistics.

Returns:
the statistics
See Also:
getDetailedStatistics()

getDetailedStatistics

public DetailedStatistics<Duration> getDetailedStatistics()
Return this stopwatch's detailed statistics, if they are being kept.

Returns:
the statistics
See Also:
getSimpleStatistics()

isDetailedStatistics

public boolean isDetailedStatistics()
Return true if detailed statistics are being kept.

Returns:
true if detailed statistics are being kept, or false if only simple statistics are being kept.

getHistogram

public Histogram<Duration> getHistogram(int numSigmas)
Return the histogram of this stopwatch's individual runs. Two different kinds of histograms can be created. The first kind is a histogram where all of the buckets are distributed normally and all have the same width. In this case, the 'numSigmas' should be set to 0.

Note: if only simple statistics are being kept, the resulting histogram is always empty.

The second kind of histogram is more useful when most of the data that is clustered near one value. This histogram is focused around the values that are up to 'numSigmas' above and below the median, and all values outside of this range are placed in the first and last bucket.

Parameters:
numSigmas - the number of standard deviations from the median, or 0 if the buckets of the histogram should be evenly distributed
Returns:
the histogram

reset

public void reset()
Reset this stopwatch and clear all statistics.


compareTo

public int compareTo(Stopwatch that)
Specified by:
compareTo in interface Comparable<Stopwatch>

toString

public String toString()
Overrides:
toString in class Object


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