org.apache.derbyTesting.perf.clients
Class BackToBackLoadGenerator

java.lang.Object
  org.apache.derbyTesting.perf.clients.BackToBackLoadGenerator

All Implemented Interfaces:

LoadGenerator

public class BackToBackLoadGenerator
extends java.lang.Object
implements LoadGenerator

Load generator which creates back-to-back load. This means that you have a number of threads running in parallel, where each thread continuously performs operations with no pauses in between.

Nested Class Summary

private class

BackToBackLoadGenerator.ClientThread Thread class which runs a single client and collects results.

Field Summary

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 BackToBackLoadGenerator.ClientThread[]	threads The threads executing.

Constructor Summary

BackToBackLoadGenerator()

Method Summary

void	init(Client[] clients) Initialize the load generator.
void	printReport(java.io.PrintStream out) Print average number of transactions per second.
void	startSteadyState() Start steady state.
void	startWarmup() Start warmup.
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

threads

private BackToBackLoadGenerator.ClientThread[] threads

The threads executing.

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

BackToBackLoadGenerator

public BackToBackLoadGenerator()

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.

Specified by:

startWarmup in interface LoadGenerator

startSteadyState

public void startSteadyState()

Start steady state.

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 number of transactions per second.

Specified by:

printReport in interface LoadGenerator

Parameters:

out - stream to print the report to