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## weka.core
Class Debug.Clock

    java.lang.Object
      weka.core.Debug.Clock

All Implemented Interfaces:
  java.io.Serializable, RevisionHandler

Enclosing class:
  Debug

    public static class Debug.Clock

extends java.lang.Object
implements java.io.Serializable, RevisionHandler

A little helper class for clocking and outputting times. It measures the CPU time if possible, otherwise it's just based on the system time. In case one just wants to measure time (e.g., database queries don't take up much CPU time, but still might take a long time to finish), then one can disable the use of CPU time as well.

Version:
  $Revision: 1.8 $
Author:
  FracPete (fracpete at waikato dot ac dot nz)
See Also:
  `ThreadMXBean.isThreadCpuTimeEnabled()`, Serialized Form

Field Summary
`static int` | `FORMAT_HHMMSS` the output format in hours:minutes:seconds, with fraction of msecs
`static int` | `FORMAT_MILLISECONDS` the output format in milli-seconds
`static int` | `FORMAT_SECONDS` the output format in seconds, with fraction of msecs
`int` | `m_OutputFormat` the format of the output
`static Tag[]` | `TAGS_FORMAT` the output formats

Constructor Summary
`Debug.Clock()` automatically starts the clock with FORMAT_SECONDS format and CPU time if available
`Debug.Clock(boolean start)` starts the clock depending on `start` immediately with the FORMAT_SECONDS output format and CPU time if available
`Debug.Clock(boolean start, int format)` starts the clock depending on `start` immediately, using CPU time if available
`Debug.Clock(int format)` automatically starts the clock with the given output format and CPU time if available

Method Summary
`int` | `getOutputFormat()` returns the output format
`java.lang.String` | `getRevision()` Returns the revision string.
`long` | `getStart()` returns the start time
`long` | `getStop()` returns the stop time or, if still running, the current time
`boolean` | `getUseCpuTime()` returns whether the use of CPU is time is enabled/disabled (regardless whether the system supports it or not)
`boolean` | `isCpuTime()` whether the measurement is based on the msecs returned from the System class or on the more accurate CPU time.
`boolean` | `isRunning()` whether the time is still being clocked
`void` | `setOutputFormat(int value)` sets the format of the output
`void` | `setUseCpuTime(boolean value)` enables/disables the use of CPU time (if measurement of CPU time is available).
`void` | `start()` saves the current system time (or CPU time) in msec as start time
`void` | `stop()` saves the current system (or CPU time) in msec as stop time
`java.lang.String` | `toString()` returns the elapsed time, getStop() - getStart(), as string

Methods inherited from class java.lang.Object
`equals, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Field Detail

### FORMAT_MILLISECONDS

    public static final int FORMAT_MILLISECONDS

  the output format in milli-seconds

  See Also:
    Constant Field Values

### FORMAT_SECONDS

    public static final int FORMAT_SECONDS

  the output format in seconds, with fraction of msecs

  See Also:
    Constant Field Values

### FORMAT_HHMMSS

    public static final int FORMAT_HHMMSS

  the output format in hours:minutes:seconds, with fraction of msecs

  See Also:
    Constant Field Values

### TAGS_FORMAT

    public static final Tag[] TAGS_FORMAT

  the output formats

### m_OutputFormat

    public int m_OutputFormat

  the format of the output

Constructor Detail

### Debug.Clock

    public Debug.Clock()

  automatically starts the clock with FORMAT_SECONDS format and CPU time if available

  See Also:
    `m_OutputFormat`

### Debug.Clock

    public Debug.Clock(int format)

  automatically starts the clock with the given output format and CPU time if available

  Parameters:
    `format` - the output format
  See Also:
    `m_OutputFormat`

### Debug.Clock

    public Debug.Clock(boolean start)

  starts the clock depending on `start` immediately with the FORMAT_SECONDS output format and CPU time if available

  Parameters:
    `start` - whether to start the clock immediately
  See Also:
    `m_OutputFormat`

### Debug.Clock

    public Debug.Clock(boolean start,
                       int format)

  starts the clock depending on `start` immediately, using CPU time if available

  Parameters:
    `start` - whether to start the clock immediately
    `format` - the format
  See Also:
    `m_OutputFormat`

Method Detail

### isCpuTime

    public boolean isCpuTime()

  whether the measurement is based on the msecs returned from the System class or on the more accurate CPU time. Also depends on whether the usage of the CPU time was disabled or enabled.

  Returns:
    true if the more accurate CPU time of the thread is used and the use of CPU time hasn't been disabled
  See Also:
    `System.currentTimeMillis()`, `ThreadMXBean.isThreadCpuTimeEnabled()`, `getUseCpuTime()`

### setUseCpuTime

    public void setUseCpuTime(boolean value)

  enables/disables the use of CPU time (if measurement of CPU time is available). The actual use of CPU time still depends on whether the system supports it. Resets the current timer, if running.

  Parameters:
    `value` - if true the CPU time is used (if possible)

### getUseCpuTime

    public boolean getUseCpuTime()

  returns whether the use of CPU is time is enabled/disabled (regardless whether the system supports it or not)

  Returns:
    true the CPU time is used (if possible)

### start

    public void start()

  saves the current system time (or CPU time) in msec as start time

  See Also:
    `m_Start`

### stop

    public void stop()

  saves the current system (or CPU time) in msec as stop time

  See Also:
    `m_Stop`

### getStart

    public long getStart()

  returns the start time

  Returns:
    the start time

### getStop

    public long getStop()

  returns the stop time or, if still running, the current time

  Returns:
    the stop time

### isRunning

    public boolean isRunning()

  whether the time is still being clocked

  Returns:
    true if the time is still being clocked

### setOutputFormat

    public void setOutputFormat(int value)

  sets the format of the output

  Parameters:
    `value` - the format of the output
  See Also:
    `m_OutputFormat`

### getOutputFormat

    public int getOutputFormat()

  returns the output format

  Returns:
    the output format
  See Also:
    `m_OutputFormat`

### toString

    public java.lang.String toString()

  returns the elapsed time, getStop() - getStart(), as string

  Overrides:
    `toString` in class `java.lang.Object`
  Returns:
    the elapsed time as string
  See Also:
    `getStart()`, `getStop()`

### getRevision

    public java.lang.String getRevision()

  Returns the revision string.

  Specified by:
    `getRevision` in interface `RevisionHandler`
  Returns:
    the revision

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