Package org.apache.jmeter.functions

Class AbstractFunction

java.lang.Object

org.apache.jmeter.functions.AbstractFunction

All Implemented Interfaces:

Function

Direct Known Subclasses:

BeanShell, CharFunction, CSVRead, EscapeHtml, EscapeOroRegexpChars, EvalFunction, EvalVarFunction, FileToString, IntSum, IterationCounter, JavaScript, Jexl2Function, JexlFunction, LogFunction, LogFunction2, LongSum, MachineIP, MachineName, Property, Property2, Random, RandomString, RegexFunction, SamplerName, SetProperty, SplitFunction, StringFromFile, TestPlanName, ThreadNumber, TimeFunction, UnEscape, UnEscapeHtml, UrlDecode, UrlEncode, Uuid, Variable, XPath

public abstract class AbstractFunction
extends Object
implements Function

Provides common methods for all functions

Constructor Summary

Constructors

Constructor	Description
AbstractFunction()

Method Summary

Modifier and Type	Method	Description
protected void	checkMinParameterCount(Collection<CompoundVariable> parameters, int minimum)	Utility method to check parameter counts.
protected void	checkParameterCount(Collection<CompoundVariable> parameters, int count)	Utility method to check parameter counts.
protected void	checkParameterCount(Collection<CompoundVariable> parameters, int min, int max)	Utility method to check parameter counts.
String	execute()
abstract String	execute(SampleResult previousResult, Sampler currentSampler)	N.B. execute() should be synchronized if function is operating with non-thread-safe objects (e.g. operates with files).
abstract String	getReferenceKey()	Return the name of your function.
protected JMeterVariables	getVariables()	Gives access to the JMeter variables for the current thread.
abstract void	setParameters(Collection<CompoundVariable> parameters)	Note: This is always called even if no parameters are provided (versions of JMeter after 2.3.1)

Methods inherited from interface org.apache.jmeter.functions.Function

getArgumentDesc

Methods inherited from class java.lang.Object

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

Constructor Detail

AbstractFunction

public AbstractFunction()

Method Detail

execute

public abstract String execute(SampleResult previousResult,
                               Sampler currentSampler)
                        throws InvalidVariableException

N.B. execute() should be synchronized if function is operating with non-thread-safe objects (e.g. operates with files).

JMeter ensures setParameters() happens-before execute(): setParameters is executed in main thread, and worker threads are started after that.

Specified by:

execute in interface Function

Parameters:

previousResult - The previous SampleResult

currentSampler - The current Sampler

Returns:

The replacement value, which was generated by the function

Throws:

InvalidVariableException - - when the variables for the function call can't be evaluated

See Also:

Function.execute(SampleResult, Sampler)

execute

public String execute()
               throws InvalidVariableException

Throws:

InvalidVariableException

setParameters

public abstract void setParameters(Collection<CompoundVariable> parameters)
                            throws InvalidVariableException

Note: This is always called even if no parameters are provided (versions of JMeter after 2.3.1)

Specified by:

setParameters in interface Function

Parameters:

parameters - The parameters for the function call

Throws:

InvalidVariableException - - when the variables for the function call can't be evaluated

See Also:

Function.setParameters(Collection)

getReferenceKey

public abstract String getReferenceKey()

Description copied from interface: Function

Return the name of your function. Convention is to prepend "__" to the name (ie "__regexFunction")

Specified by:

getReferenceKey in interface Function

Returns:

The name of the funtion

See Also:

Function.getReferenceKey()

getVariables

protected JMeterVariables getVariables()

Gives access to the JMeter variables for the current thread.

Returns:

a pointer to the JMeter variables.

checkParameterCount

protected void checkParameterCount(Collection<CompoundVariable> parameters,
                                   int min,
                                   int max)
                            throws InvalidVariableException

Utility method to check parameter counts.

Parameters:

parameters - collection of parameters

min - minimum number of parameters allowed

max - maximum number of parameters allowed

Throws:

InvalidVariableException - if the number of parameters is incorrect

checkParameterCount

protected void checkParameterCount(Collection<CompoundVariable> parameters,
                                   int count)
                            throws InvalidVariableException

Utility method to check parameter counts.

Parameters:

parameters - collection of parameters

count - number of parameters expected

Throws:

InvalidVariableException - if the number of parameters is incorrect

checkMinParameterCount

protected void checkMinParameterCount(Collection<CompoundVariable> parameters,
                                      int minimum)
                               throws InvalidVariableException

Utility method to check parameter counts.

Parameters:

parameters - collection of parameters

minimum - number of parameters expected

Throws:

InvalidVariableException - if the number of parameters is incorrect