org.apache.derbyTesting.perf.clients

Class PoissonLoadGenerator

java.lang.Object

org.apache.derbyTesting.perf.clients.PoissonLoadGenerator

All Implemented Interfaces:

LoadGenerator

public class PoissonLoadGenerator
extends java.lang.Object
implements LoadGenerator

Load generator which generates Poisson distributed requests.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
private class	PoissonLoadGenerator.ClientThread Thread class which runs a single client and collects results.

Field Summary

Fields

Modifier and Type	Field and Description
private double	avgWaitTime The average time (in milliseconds) between each request from a client.
private boolean	collect Flag which tells the generator to collect results.
private long	startTime Start time for steady-state phase.
private boolean	stop Flag which tells the generator to stop.
private long	stopTime Stop time for steady-state phase.
private PoissonLoadGenerator.ClientThread[]	threads The client threads used to generate load.

Constructor Summary

Constructors

Constructor and Description
PoissonLoadGenerator(double avgWaitTime) Construct a PoissonLoadGenerator instance.

Method Summary

Modifier and Type	Method and Description
void	init(Client[] clients) Initialize the load generator.
void	printReport(java.io.PrintStream out) Print average transaction injection rate and response times.
void	startSteadyState() Start steady-state phase.
void	startWarmup() Start warmup phase.
void	stop() Stop the load generator.

Methods inherited from class java.lang.Object

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

Field Detail

avgWaitTime

private final double avgWaitTime

The average time (in milliseconds) between each request from a client.

threads

private PoissonLoadGenerator.ClientThread[] threads

The client threads used to generate load.

stop

private volatile boolean stop

Flag which tells the generator to stop.

collect

private volatile boolean collect

Flag which tells the generator to collect results.

startTime

private long startTime

Start time for steady-state phase.

stopTime

private long stopTime

Stop time for steady-state phase.

Constructor Detail

PoissonLoadGenerator

public PoissonLoadGenerator(double avgWaitTime)

Construct a PoissonLoadGenerator instance.

Parameters:

avgWaitTime - the time (in millisecond) between each request from a client

Method Detail

init

public void init(Client[] clients)

Initialize the load generator.

Specified by:

init in interface LoadGenerator

Parameters:

clients - the test clients to use

startWarmup

public void startWarmup()

Start warmup phase.

Specified by:

startWarmup in interface LoadGenerator

startSteadyState

public void startSteadyState()

Start steady-state phase.

Specified by:

startSteadyState in interface LoadGenerator

stop

public void stop()

Stop the load generator.

Specified by:

stop in interface LoadGenerator

printReport

public void printReport(java.io.PrintStream out)

Print average transaction injection rate and response times.

Specified by:

printReport in interface LoadGenerator

Parameters:

out - stream to print the report to