Package com.singularsys.jep.misc.threadsafeeval

Class ThreadSafeEvaluator

java.lang.Object

com.singularsys.jep.standard.FastEvaluator

com.singularsys.jep.misc.threadsafeeval.ThreadSafeEvaluator

All Implemented Interfaces:

Evaluator, JepComponent, ParserVisitor, Serializable

public class ThreadSafeEvaluator
extends FastEvaluator

An evaluator which can safely evaluate an expression in multiple threads. It works by finding the name of a variable from a Node and then using that name to find the variable from the variable table. In essence, it adds one hash table lookup for each variable reference.

Since:

Jep 3.5

Author:

Richard Morris

See Also:

• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
protected Jep	jep
protected VariableTable	vt

Fields inherited from class com.singularsys.jep.standard.FastEvaluator

trapInfinity, trapNaN, trapNullValues, trapUnsetValues

Constructor Summary

Constructors

Constructor	Description
ThreadSafeEvaluator()

Method Summary

Modifier and Type	Method	Description
JepComponent	getLightWeightInstance()	Gets a light-weight instance suitable for using in multiple threads.
Variable	getVariable(String name)
void	init(Jep jep1)	Initialize the component.
Object	visitVar(Node node)

Methods inherited from class com.singularsys.jep.standard.FastEvaluator

eval, evaluate, isTrapInfinity, isTrapNaN, isTrapNullValues, isTrapUnsetValues, nodeAccept, setTrapInfinity, setTrapNaN, setTrapNullValues, setTrapUnsetValues, visit, visit, visit, visit, visitConstant, visitFun

Methods inherited from class java.lang.Object

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

Field Details

jep

protected Jep jep

vt

protected VariableTable vt

Constructor Details

ThreadSafeEvaluator

public ThreadSafeEvaluator()

Method Details

init

public void init(Jep jep1)

Description copied from interface: JepComponent

Initialize the component. This method is called whenever a component is added to Jep. Hence, it allows components to keep track of the other components they may rely on.

Specified by:

init in interface JepComponent

Overrides:

init in class FastEvaluator

Parameters:

jep1 - the current Jep instance

getLightWeightInstance

public JepComponent getLightWeightInstance()

Description copied from interface: JepComponent

Gets a light-weight instance suitable for using in multiple threads.

Specified by:

getLightWeightInstance in interface JepComponent

Overrides:

getLightWeightInstance in class FastEvaluator

Returns:

a new FastEvaluator

getVariable

public Variable getVariable(String name)

visitVar

public Object visitVar(Node node)
                throws EvaluationException

Overrides:

visitVar in class FastEvaluator

Throws:

EvaluationException