performanceMonitor

Class PerformanceMonitor

java.lang.Object

performanceMonitor.PerformanceMonitor

All Implemented Interfaces:

java.lang.Runnable

public class PerformanceMonitor
extends java.lang.Object
implements java.lang.Runnable

The class PerformanceMonitor is responsible for monitoring system resources. For now the following information is captured: - timestamp of the measurement
- CPU usage by all processes
- CPU usage by the VBS

It is intended to run in its own thread. The used library for performance measurements is Hyperic SIGAR: http://www.hyperic.com/products/sigar/

Author:

Tomasz Bujlow (tbu@es.aau.dk)

Field Summary

Fields

Modifier and Type	Field and Description
private boolean	isStarted Flag used to determine if the thread is fully started.
private static org.apache.log4j.Logger	log Used to log different events.
private PerformanceMonitorQueue	myPerformanceMonitorQueue Queue of information about measurements.
private java.lang.Thread	performanceMonitorThread Thread used by this class.
private boolean	runFlag Flag used to stop the thread.
private int	samplingInterval Interval between measurements.

Constructor Summary

Constructors

Constructor and Description
PerformanceMonitor() Constructs the object.

Method Summary

Methods

Modifier and Type	Method and Description
PerformanceMonitorQueue	getPerformanceMonitorQueue() Gets the queue of information about measurements.
boolean	isAlive() Checks if PerformanceMonitor is alive.
void	run() Runs the thread in loop.
private void	sample() Makes measurements and stores them in the queue.
void	setSamplingInterval(int samplingInterval) Sets the interval between measurements.
void	start() Starts the thread.
void	stop() Stops the thread.

Methods inherited from class java.lang.Object

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

Field Detail

log

private static org.apache.log4j.Logger log

Used to log different events.

performanceMonitorThread

private java.lang.Thread performanceMonitorThread

Thread used by this class.

runFlag

private boolean runFlag

Flag used to stop the thread.

isStarted

private boolean isStarted

Flag used to determine if the thread is fully started.

samplingInterval

private int samplingInterval

Interval between measurements.

myPerformanceMonitorQueue

private PerformanceMonitorQueue myPerformanceMonitorQueue

Queue of information about measurements.

Constructor Detail

PerformanceMonitor

public PerformanceMonitor()

Constructs the object.

Method Detail

start

public void start()

Starts the thread.

stop

public void stop()

Stops the thread.

isAlive

public boolean isAlive()

Checks if PerformanceMonitor is alive. It means that:
- the thread must exists
- the thread must be fully started and running (isStarted equals true). This condition is used to check if the thread is fully started or if it needs more time to start.

Returns:

true if the thread is fully started and operational, false otherwise

run

public void run()

Runs the thread in loop. Resources are sampled periodically depending on the interval.

Specified by:

run in interface java.lang.Runnable

setSamplingInterval

public void setSamplingInterval(int samplingInterval)

Sets the interval between measurements.

Parameters:

samplingInterval - interval between measurements

getPerformanceMonitorQueue

public PerformanceMonitorQueue getPerformanceMonitorQueue()

Gets the queue of information about measurements.

Returns:

queue of information about measurements

sample

private void sample()

Makes measurements and stores them in the queue.