ERXLazyValue< T > Class Reference

Collaboration diagram for ERXLazyValue< T >:

[legend]

List of all members.

Classes
class	AjaxPageUserInfoCacheKeyInvalidator
class	AlwaysInvalidator
class	CacheKeyInvalidator
class	ConstantSource< T >
interface	Invalidator
class	KVCSource< T >
class	MutableCacheKeyInvalidator
class	NeverInvalidator
class	PageUserInfoCacheKeyInvalidator
interface	Source< T >
class	ThreadStorageCacheKeyInvalidator
class	TimedInvalidator
Public Member Functions
	ERXLazyValue (ERXLazyValue.Source< T > dataSource, ERXLazyValue.Invalidator invalidator)
	ERXLazyValue (Object target, String keyPath, ERXLazyValue.Invalidator invalidator)
	ERXLazyValue (Object target, String keyPath)
	ERXLazyValue (ERXLazyValue.Source< T > dataSource)
synchronized void	invalidate ()
synchronized void	setValue (T value)
synchronized T	value ()
Static Public Attributes
static Logger	log = Logger.getLogger(ERXLazyValue.class)
Private Attributes
ERXLazyValue.Source< T >	_dataSource
ERXLazyValue.Invalidator	_invalidator
T	_value
boolean	_valueCached

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Detailed Description

ERXLazyValue provides a way to model lazy-loaded values that invalidate with different methods. This is very useful for storing expensive values that are returned from bound component methods as well as values that are cached that are influenced by different areas of a single page (i.e. ajax operations on one part of the page that need to invalidate a cache on another part of the page).

Author:

mschrag

Parameters:

<T>

the type of the lazy value

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Constructor & Destructor Documentation

ERXLazyValue

(

ERXLazyValue< T >.Source< T >

dataSource

)

Constructs a new ERXLazyValue with a data source and a NeverInvalidator, which behaves like a "once" lazy value.

Parameters:

dataSource

the data source for the lazy value

ERXLazyValue	(	Object	target,
		String	keyPath
	)

Constructs a new ERXLazyValue with a shortcut for a KVCSource and a NeverInvalidator, which behaves like a "once" lazy value.

Parameters:

	target	the target of the KVCSource
	keyPath	the keypath of the KVCSource

ERXLazyValue	(	Object	target,
		String	keyPath,
		ERXLazyValue< T >.Invalidator	invalidator
	)

Constructs a new ERXLazyValue with a shortcut for a KVCSource and an invalidator.

Parameters:

	target	the target of the KVCSource
	keyPath	the keypath of the KVCSource
	invalidator	the invalidator to use

ERXLazyValue	(	ERXLazyValue< T >.Source< T >	dataSource,
		ERXLazyValue< T >.Invalidator	invalidator
	)

Constructs a new ERXLazyValue with a data source and an invalidator.

Parameters:

	dataSource	the data source for the lazy value
	invalidator	the invalidator to use

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Member Function Documentation

synchronized void invalidate

(

)

Forecfully invalidates the lazy value, regardless of the state of the invalidator.

synchronized void setValue

(

T

value

)

Sets the backging value for this lazy value, which will always call through to the underlying data source. This will also cache the new value and notify the invalidator of a new fetched value (acting just like if value() was called on an invalidated cache).

Parameters:

value

the new value

synchronized T value

(

)

Returns the backing value for this lazy value, which will only sometimes trigger a call through to the data source.

Returns:

the backing value

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Member Data Documentation

ERXLazyValue.Source<T> _dataSource [private]

ERXLazyValue.Invalidator _invalidator [private]

T _value [private]

boolean _valueCached [private]

Logger log = Logger.getLogger(ERXLazyValue.class) [static]

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The documentation for this class was generated from the following file:

• /opt/source/Wonder/Frameworks/Core/ERExtensions/Sources/er/extensions/foundation/ERXLazyValue.java