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>
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_ |
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.
Definition at line 299 of file Caching_Strategies_T.h.
| typedef ATTRIBUTES ACE_LFU_Caching_Strategy< ATTRIBUTES, CACHING_UTILITY >::CACHING_ATTRIBUTES |
Definition at line 305 of file Caching_Strategies_T.h.
| 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%.
Definition at line 36 of file Caching_Strategies_T.cpp.
: purge_percent_ (10) { }
| ATTRIBUTES ACE_LFU_Caching_Strategy< ATTRIBUTES, CACHING_UTILITY >::attributes | ( | void | ) | [inline] |
| CACHING_UTILITY & ACE_LFU_Caching_Strategy< ATTRIBUTES, CACHING_UTILITY >::caching_utility | ( | void | ) | [inline] |
Purge the cache.
Definition at line 267 of file Caching_Strategies_T.inl.
{
return this->caching_utility_;
}
| void ACE_LFU_Caching_Strategy< ATTRIBUTES, CACHING_UTILITY >::dump | ( | void | ) | const [inline] |
Dumps the state of the object.
Definition at line 273 of file Caching_Strategies_T.inl.
{
#if defined (ACE_HAS_DUMP)
ACE_TRACE ("ACE_LFU_Caching_Strategy::dump");
ACE_DEBUG ((LM_DEBUG, ACE_BEGIN_DUMP, this));
ACE_DEBUG ((LM_DEBUG, ACE_END_DUMP));
#endif /* ACE_HAS_DUMP */
}
| 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.
Definition at line 228 of file Caching_Strategies_T.inl.
{
return result;
}
| int ACE_LFU_Caching_Strategy< ATTRIBUTES, CACHING_UTILITY >::notify_find | ( | int | result, | |
| ATTRIBUTES & | attr | |||
| ) | [inline] |
Lookup notification.
Definition at line 236 of file Caching_Strategies_T.inl.
{
if (result == 0)
++attr;
return result;
}
| 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
Definition at line 253 of file Caching_Strategies_T.inl.
{
return result;
}
| 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
Definition at line 246 of file Caching_Strategies_T.inl.
{
return result;
}
| 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
Definition at line 260 of file Caching_Strategies_T.inl.
{
return result;
}
| double ACE_LFU_Caching_Strategy< ATTRIBUTES, CACHING_UTILITY >::purge_percent | ( | void | ) | [inline] |
Get the percentage of entries to purge.
Definition at line 216 of file Caching_Strategies_T.inl.
{
return this->purge_percent_;
}
| void ACE_LFU_Caching_Strategy< ATTRIBUTES, CACHING_UTILITY >::purge_percent | ( | double | percentage | ) | [inline] |
Set the percentage of entries to purge.
Definition at line 222 of file Caching_Strategies_T.inl.
{
this->purge_percent_ = percentage;
}
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.
Definition at line 368 of file Caching_Strategies_T.h.
double ACE_LFU_Caching_Strategy< ATTRIBUTES, CACHING_UTILITY >::purge_percent_ [private] |
The level about which the purging will happen automagically.
Definition at line 364 of file Caching_Strategies_T.h.
1.7.0