weka.core

Class Debug.Clock

java.lang.Object

weka.core.Debug.Clock

All Implemented Interfaces:

Serializable, RevisionHandler

Enclosing class:

Debug

public static class Debug.Clock
extends Object
implements 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: 8034 $

Author:

FracPete (fracpete at waikato dot ac dot nz)

See Also:

ThreadMXBean.isThreadCpuTimeEnabled(), Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
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

Constructors

Constructor and Description
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

Methods

Modifier and Type	Method and Description
int	getOutputFormat() returns the output format
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
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 String toString()

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

Overrides:

toString in class Object

Returns:

the elapsed time as string

See Also:

getStart(), getStop()

getRevision

public String getRevision()

Returns the revision string.

Specified by:

getRevision in interface RevisionHandler

Returns:

the revision