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# ACE_LFU_Caching_Strategy 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:

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List of all members.

## Public Types
typedef ATTRIBUTES | CACHING_ATTRIBUTES
## Public Methods
| ACE_LFU_Caching_Strategy (void)
ATTRIBUTES | attributes (void)
| Access the attributes. More...
double | purge_percent (void)
| Get the percentage of entries to purge. More...
void | purge_percent (double percentage)
| Set the percentage of entries to purge. More...
int | notify_bind (int result, const ATTRIBUTES &attr)
| This method acts as a notification about the CONTAINERs bind method call. More...
int | notify_find (int result, ATTRIBUTES &attr)
| Lookup notification. More...
int | notify_unbind (int result, const ATTRIBUTES &attr)
| This method acts as a notification about the CONTAINERs unbind method call. More...
int | notify_trybind (int result, ATTRIBUTES &attr)
| This method acts as a notification about the CONTAINERs trybind method call. More...
int | notify_rebind (int result, const ATTRIBUTES &attr)
| This method acts as a notification about the CONTAINERs rebind method call. More...
CACHING_UTILITY & | caching_utility (void)
| Purge the cache. More...
void | dump (void) const
| Dumps the state of the object. More...
## Private Attributes
double | purge_percent_
| The level about which the purging will happen automagically. More...
CACHING_UTILITY | caching_utility_
| This is the helper class which will decide and expunge entries from the cache. More...

## 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::CACHING_ATTRIBUTES

## Constructor & Destructor Documentation

template<class ATTRIBUTES, class CACHING_UTILITY>
ACE_LFU_Caching_Strategy< ATTRIBUTES, CACHING_UTILITY >::ACE_LFU_Caching_Strategy | ( | void |  | ) |

| 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 |  | ) |

| Access the attributes.

template<class ATTRIBUTES, class CACHING_UTILITY>
ACE_INLINE CACHING_UTILITY & ACE_LFU_Caching_Strategy< ATTRIBUTES, CACHING_UTILITY >::caching_utility | ( | void |  | ) |

| Purge the cache.

template<class ATTRIBUTES, class CACHING_UTILITY>
ACE_INLINE void ACE_LFU_Caching_Strategy< ATTRIBUTES, CACHING_UTILITY >::dump | ( | void |  | ) | const

| Dumps the state of the object.

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

| 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
| ) |

| Lookup notification.

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

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

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

| 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_unbind | ( | int | result,
|  | const ATTRIBUTES & | attr
| ) |

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

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

| Set the percentage of entries to purge.

template<class ATTRIBUTES, class CACHING_UTILITY>
ACE_INLINE double ACE_LFU_Caching_Strategy< ATTRIBUTES, CACHING_UTILITY >::purge_percent | ( | void |  | ) |

| Get the percentage of entries to purge.

## Member Data Documentation

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

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

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

| The level about which the purging will happen automagically.

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

- Caching_Strategies_T.h
- Caching_Strategies_T.cpp
- Caching_Strategies_T.i