Package org.apache.hadoop.util

Class StopWatch

java.lang.Object

org.apache.hadoop.util.StopWatch

All Implemented Interfaces:

java.io.Closeable, java.lang.AutoCloseable

public class StopWatch
extends java.lang.Object
implements java.io.Closeable

A simplified StopWatch implementation which can measure times in nanoseconds.

Constructor Summary

Constructors

Constructor	Description
StopWatch()
StopWatch(Timer timer)	Used for tests to be able to create a StopWatch which does not follow real time.

Method Summary

Modifier and Type	Method	Description
void	close()
boolean	isRunning()	The method is used to find out if the StopWatch is started.
long	now()
long	now(java.util.concurrent.TimeUnit timeUnit)	now.
StopWatch	reset()	Reset elapsed time to zero and make the state of stopwatch stop.
StopWatch	start()	Start to measure times and make the state of stopwatch running.
StopWatch	stop()	Stop elapsed time and make the state of stopwatch stop.
java.lang.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(Timer timer)

Used for tests to be able to create a StopWatch which does not follow real time.

Parameters:

timer - The timer to base this StopWatch's timekeeping off of.

Method Detail

isRunning

public boolean isRunning()

The method is used to find out if the StopWatch is started.

Returns:

boolean If the StopWatch is started.

start

public StopWatch start()

Start to measure times and make the state of stopwatch running.

Returns:

this instance of StopWatch.

stop

public StopWatch stop()

Stop elapsed time and make the state of stopwatch stop.

Returns:

this instance of StopWatch.

reset

public StopWatch reset()

Reset elapsed time to zero and make the state of stopwatch stop.

Returns:

this instance of StopWatch.

now

public long now(java.util.concurrent.TimeUnit timeUnit)

now.

Parameters:

timeUnit - timeUnit.

Returns:

current elapsed time in specified timeunit.

now

public long now()

Returns:

current elapsed time in nanosecond.

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

close

public void close()

Specified by:

close in interface java.lang.AutoCloseable

Specified by:

close in interface java.io.Closeable