ACE_LFU_Caching_Strategy< ATTRIBUTES, CACHING_UTILITY > Class Template Reference

Defines a Least Frequently Used strategy for which will decide on the item to be removed from the cache. More...

#include <Caching_Strategies_T.h>

Collaboration diagram for ACE_LFU_Caching_Strategy< ATTRIBUTES, CACHING_UTILITY >:

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Public Types

typedef ATTRIBUTES CACHING_ATTRIBUTES

Public Member Functions

 ACE_LFU_Caching_Strategy (void)
ATTRIBUTES attributes (void)
 Access the attributes.
double purge_percent (void)
 Get the percentage of entries to purge.
void purge_percent (double percentage)
 Set the percentage of entries to purge.
int notify_bind (int result, const ATTRIBUTES &attr)
int notify_find (int result, ATTRIBUTES &attr)
 Lookup notification.
int notify_unbind (int result, const ATTRIBUTES &attr)
int notify_trybind (int result, ATTRIBUTES &attr)
int notify_rebind (int result, const ATTRIBUTES &attr)
CACHING_UTILITY & caching_utility (void)
 Purge the cache.
void dump (void) const
 Dumps the state of the object.

Private Attributes

double purge_percent_
 The level about which the purging will happen automagically.
CACHING_UTILITY caching_utility_


Detailed Description

template<class ATTRIBUTES, class CACHING_UTILITY>
class ACE_LFU_Caching_Strategy< ATTRIBUTES, CACHING_UTILITY >

Defines a Least Frequently Used strategy for which will decide on the item to be removed from the cache.

A attribute is tagged to each item which increments whenever the item is bound or looked up in the cache. Thus it denotes the frequency of use. According to the value of the attribute the item is removed from the CONTAINER i.e cache. Explanation of the template parameter list: CONTAINER is any map with entries of type <KEY, VALUE>. The ATTRIBUTES are the deciding factor for purging of entries and should logically be included with the VALUE. Some ways of doing this are: As being a member of the VALUE or VALUE being ACE_Pair<x, ATTRIBUTES>. The CACHING_UTILITY is the class which can be plugged in and which decides the entries to purge.


Member Typedef Documentation

template<class ATTRIBUTES, class CACHING_UTILITY>
typedef ATTRIBUTES ACE_LFU_Caching_Strategy< ATTRIBUTES, CACHING_UTILITY >::CACHING_ATTRIBUTES


Constructor & Destructor Documentation

template<class ATTRIBUTES, class CACHING_UTILITY>
ACE_LFU_Caching_Strategy< ATTRIBUTES, CACHING_UTILITY >::ACE_LFU_Caching_Strategy ( void   )  [inline]

The <container> is the map in which the entries reside. The timer attribute is initialed to zero in this constructor. And the <purge_percent> field denotes the percentage of the entries in the cache which can be purged automagically and by default is set to 10%.


Member Function Documentation

template<class ATTRIBUTES, class CACHING_UTILITY>
ACE_INLINE ATTRIBUTES ACE_LFU_Caching_Strategy< ATTRIBUTES, CACHING_UTILITY >::attributes ( void   )  [inline]

Access the attributes.

template<class ATTRIBUTES, class CACHING_UTILITY>
ACE_INLINE double ACE_LFU_Caching_Strategy< ATTRIBUTES, CACHING_UTILITY >::purge_percent ( void   )  [inline]

Get the percentage of entries to purge.

template<class ATTRIBUTES, class CACHING_UTILITY>
ACE_INLINE void ACE_LFU_Caching_Strategy< ATTRIBUTES, CACHING_UTILITY >::purge_percent ( double  percentage  )  [inline]

Set the percentage of entries to purge.

template<class ATTRIBUTES, class CACHING_UTILITY>
ACE_INLINE int ACE_LFU_Caching_Strategy< ATTRIBUTES, CACHING_UTILITY >::notify_bind ( int  result,
const ATTRIBUTES &  attr 
) [inline]

This method acts as a notification about the CONTAINERs bind method call.

template<class ATTRIBUTES, class CACHING_UTILITY>
ACE_INLINE int ACE_LFU_Caching_Strategy< ATTRIBUTES, CACHING_UTILITY >::notify_find ( int  result,
ATTRIBUTES &  attr 
) [inline]

Lookup notification.

template<class ATTRIBUTES, class CACHING_UTILITY>
ACE_INLINE int ACE_LFU_Caching_Strategy< ATTRIBUTES, CACHING_UTILITY >::notify_unbind ( int  result,
const ATTRIBUTES &  attr 
) [inline]

This method acts as a notification about the CONTAINERs unbind method call

template<class ATTRIBUTES, class CACHING_UTILITY>
ACE_INLINE int ACE_LFU_Caching_Strategy< ATTRIBUTES, CACHING_UTILITY >::notify_trybind ( int  result,
ATTRIBUTES &  attr 
) [inline]

This method acts as a notification about the CONTAINERs trybind method call

template<class ATTRIBUTES, class CACHING_UTILITY>
ACE_INLINE int ACE_LFU_Caching_Strategy< ATTRIBUTES, CACHING_UTILITY >::notify_rebind ( int  result,
const ATTRIBUTES &  attr 
) [inline]

This method acts as a notification about the CONTAINERs rebind method call

template<class ATTRIBUTES, class CACHING_UTILITY>
ACE_INLINE CACHING_UTILITY & ACE_LFU_Caching_Strategy< ATTRIBUTES, CACHING_UTILITY >::caching_utility ( void   )  [inline]

Purge the cache.

template<class ATTRIBUTES, class CACHING_UTILITY>
ACE_INLINE void ACE_LFU_Caching_Strategy< ATTRIBUTES, CACHING_UTILITY >::dump ( void   )  const [inline]

Dumps the state of the object.


Member Data Documentation

template<class ATTRIBUTES, class CACHING_UTILITY>
double ACE_LFU_Caching_Strategy< ATTRIBUTES, CACHING_UTILITY >::purge_percent_ [private]

The level about which the purging will happen automagically.

template<class ATTRIBUTES, class CACHING_UTILITY>
CACHING_UTILITY ACE_LFU_Caching_Strategy< ATTRIBUTES, CACHING_UTILITY >::caching_utility_ [private]

This is the helper class which will decide and expunge entries from the cache.


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

Generated on Wed Apr 23 02:39:36 2008 for ACE by  doxygen 1.5.5