org.apache.hadoop.hbase.io.hfile

Class NanoTimer

java.lang.Object

org.apache.hadoop.hbase.io.hfile.NanoTimer

public class NanoTimer
extends java.lang.Object

A nano-second timer.

Copied from hadoop-3315 tfile. Remove after tfile is committed and use the tfile version of this class instead.

Constructor Summary

Constructors

Constructor and Description
NanoTimer(boolean start) Constructor

Method Summary

Modifier and Type	Method and Description
boolean	isStarted() Checking whether the timer is started
static void	main(java.lang.String[] args) Simple tester.
static java.lang.String	nanoTimeToString(long t) A utility method to format a time duration in nano seconds into a human understandable stirng.
long	read() Read the timer.
void	reset() Reset the timer.
void	start() Start the timer.
void	stop() Stop the timer.
java.lang.String	toString() Format the elapsed time to a human understandable string.

Methods inherited from class java.lang.Object

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

Constructor Detail

NanoTimer

public NanoTimer(boolean start)

Constructor

Parameters:

start - Start the timer upon construction.

Method Detail

start

public void start()

Start the timer. Note: No effect if timer is already started.

stop

public void stop()

Stop the timer. Note: No effect if timer is already stopped.

read

public long read()

Read the timer.

Returns:

the elapsed time in nano-seconds. Note: If the timer is never started before, -1 is returned.

reset

public void reset()

Reset the timer.

isStarted

public boolean isStarted()

Checking whether the timer is started

Returns:

true if timer is started.

toString

public java.lang.String toString()

Format the elapsed time to a human understandable string. Note: If timer is never started, "ERR" will be returned.

Overrides:

toString in class java.lang.Object

nanoTimeToString

public static java.lang.String nanoTimeToString(long t)

A utility method to format a time duration in nano seconds into a human understandable stirng.

Parameters:

t - Time duration in nano seconds.

Returns:

String representation.

main

public static void main(java.lang.String[] args)

Simple tester.

Parameters:

args -