de.unihalle.informatik.MiToBo.tools.system

Class UserTime

java.lang.Object

de.unihalle.informatik.MiToBo.tools.system.UserTime

public class UserTime
extends Object

This is a stopwatch to measure elapsed user or real time used.

If the proper native library is availabe and is requested user time is elapsed. Otherwith real time is elapsed. If you like to use this class you must set the VM option -Djava.library.path to the directory where the native library resides.
The native library is

• JNI_time.dll for Windows,
• libJNI_time.so for Linux,
• libJNI_time.jnilib for Mac OS X.

Author:

Jens Keilwagen, modified: Stefan Posch

Field Summary

Fields

Modifier and Type	Field and Description
private static boolean	debug For internal use.
(package private) static boolean	haveJNI Were we able to load the JNI library?
(package private) float	start Variable to save start value.
(package private) long	startReal Variable to save real start value.
(package private) float	ticks Variable to remember ticks.
(package private) static String	timeLib Basename of the JNI library.
private boolean	useJNI Does this instance use JNI and thus user time?

Constructor Summary

Constructors

Constructor and Description
UserTime() Creates a new time object and starts the clock.
UserTime(boolean useUsertime) Creates a new time object and starts the clock elapsing real time.

Method Summary

Modifier and Type	Method and Description
double	getElapsedTime() Returns the elapsed time since last reset (or invoking the constructor) in seconds
String	getOperation() Return UserTime or RealTime depending on mode of operation
private long	getTicks() Declaration of native method for getting ticks.
private float	getUserTime() Declaration of native method for user time measurement.
void	reset() Reset time

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

haveJNI

static boolean haveJNI

Were we able to load the JNI library?

timeLib

static final String timeLib

Basename of the JNI library.

useJNI

private boolean useJNI

Does this instance use JNI and thus user time?

debug

private static boolean debug

For internal use.

start

float start

Variable to save start value.

ticks

float ticks

Variable to remember ticks.

startReal

long startReal

Variable to save real start value.

Constructor Detail

UserTime

public UserTime()

Creates a new time object and starts the clock. Elapses user time, if runtime library is available, otherwise the real time.

UserTime

public UserTime(boolean useUsertime)

Creates a new time object and starts the clock elapsing real time. Elapses user time, if useUsertime is true and the runtime library is available, otherwise the real time.

Method Detail

getElapsedTime

public double getElapsedTime()

Returns the elapsed time since last reset (or invoking the constructor) in seconds

reset

public void reset()

Reset time

getOperation

public String getOperation()

Return UserTime or RealTime depending on mode of operation

getUserTime

private float getUserTime()

Declaration of native method for user time measurement.

Returns:

Current user time.

getTicks

private long getTicks()

Declaration of native method for getting ticks.

Returns:

Ticks.