org.epics.pvmanager.expression

Class Cache<T>

java.lang.Object

org.epics.pvmanager.expression.DesiredRateExpressionListImpl<R>

org.epics.pvmanager.expression.DesiredRateExpressionImpl<List<T>>

org.epics.pvmanager.expression.Cache<T>

Type Parameters:

T - the type of values in the cache

All Implemented Interfaces:

DesiredRateExpression<List<T>>, DesiredRateExpressionList<List<T>>

public class Cache<T>
extends DesiredRateExpressionImpl<List<T>>

A cache expression.

The expression can be used to collect values from pvmanager datasources or from external sources.

Author:

carcassi

Constructor Summary

Constructors

Constructor and Description
Cache(int maxSize) Creates a new cache expression.
Cache(SourceRateExpression<T> sourceExpression, int maxSize) Creates a new cache expression.

Method Summary

Methods

Modifier and Type	Method and Description
void	add(T newValue) Adds a new value to the cache.
WriteFunction<T>	getWriteFunction() The write function to be used to fill the cache.
Cache<T>	maxSize(int maxSize) Changes the maximum size of the cache.

Methods inherited from class org.epics.pvmanager.expression.DesiredRateExpressionImpl

as, fillReadRecipe, getDesiredRateExpressionImpl, getFunction, getName

Methods inherited from class org.epics.pvmanager.expression.DesiredRateExpressionListImpl

and, getDesiredRateExpressions

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.epics.pvmanager.expression.DesiredRateExpressionList

and, getDesiredRateExpressions

Constructor Detail

Cache

public Cache(int maxSize)

Creates a new cache expression.

Parameters:

maxSize - the maximum number of elements in the cache

Cache

public Cache(SourceRateExpression<T> sourceExpression,
     int maxSize)

Creates a new cache expression.

Parameters:

sourceExpression - the source rate expression that will fill the cache

maxSize - the maximum number of elements in the cache

Method Detail

getWriteFunction

public WriteFunction<T> getWriteFunction()

The write function to be used to fill the cache.

Returns:

a write function

maxSize

public Cache<T> maxSize(int maxSize)

Changes the maximum size of the cache.

Parameters:

maxSize - the number of values kept in the cache

Returns:

this expression

add

public void add(T newValue)

Adds a new value to the cache.

Parameters:

newValue - the value to be added