CircuitCache Class Reference

Bounded LRU cache mapping gate UUIDs to their CircuitCacheInfos. More...

#include "CircuitCache.h"

Public Types
typedef CircuitCacheInfos	item_type
	The value type stored in the cache.
typedef item_list::iterator	iterator
	Iterator type for iterating over cache entries in FIFO order.

Public Member Functions
	CircuitCache ()
	Construct an empty cache.
bool	insert (const CircuitCacheInfos &infos)
	Insert a new gate into the cache, evicting the oldest if necessary.
std::optional< CircuitCacheInfos >	get (pg_uuid_t token) const
	Look up a gate by UUID.
iterator	begin ()
	Iterator to the first cached entry (oldest).
iterator	end ()
	Past-the-end iterator for the cache.

Private Types
typedef multi_index_container< CircuitCacheInfos, indexed_by< sequenced<>, hashed_unique< member< CircuitCacheInfos, pg_uuid_t, &CircuitCacheInfos::token > > > >	item_list
	Boost multi-index container type for cache entries.

Private Attributes
item_list	il
	The container holding cached entries.
unsigned	current_size
	Current total byte usage of cached entries.

Detailed Description

Bounded LRU cache mapping gate UUIDs to their CircuitCacheInfos.

Internally a Boost multi_index_container provides two views of the same data:

• A sequenced (insertion-order) index used to evict the oldest entry when the cache is full.
• A hashed-unique index keyed on token for O(1) lookup.

The cache is not thread-safe; each backend process maintains its own instance.

Definition at line 71 of file CircuitCache.h.

Member Typedef Documentation

item_list

typedef multi_index_container< CircuitCacheInfos, indexed_by< sequenced<>, hashed_unique<member<CircuitCacheInfos, pg_uuid_t, &CircuitCacheInfos::token> > > > CircuitCache::item_list

private

Boost multi-index container type for cache entries.

Definition at line 80 of file CircuitCache.h.

item_type

typedef CircuitCacheInfos CircuitCache::item_type

The value type stored in the cache.

Definition at line 86 of file CircuitCache.h.

iterator

typedef item_list::iterator CircuitCache::iterator

Iterator type for iterating over cache entries in FIFO order.

Definition at line 88 of file CircuitCache.h.

Constructor & Destructor Documentation

CircuitCache()

CircuitCache::CircuitCache ( )

inline

Construct an empty cache.

Definition at line 91 of file CircuitCache.h.

Member Function Documentation

begin()

iterator CircuitCache::begin ( )

inline

Iterator to the first cached entry (oldest).

Returns

Iterator pointing to the oldest cache entry.

Definition at line 121 of file CircuitCache.h.

end()

iterator CircuitCache::end ( )

inline

Past-the-end iterator for the cache.

Returns

Iterator one past the last cache entry.

Definition at line 128 of file CircuitCache.h.

get()

std::optional< CircuitCacheInfos > CircuitCache::get

(

pg_uuid_t

token

)

const

Look up a gate by UUID.

Parameters

token

UUID of the gate to find.

Returns

An std::optional containing the CircuitCacheInfos if found, or std::nullopt on a cache miss.

Definition at line 43 of file CircuitCache.cpp.

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insert()

bool CircuitCache::insert

(

const CircuitCacheInfos &

infos

)

Insert a new gate into the cache, evicting the oldest if necessary.

If infos.token is already present in the cache the insert is a no-op and the function returns false. Otherwise the entry is added and, if the cache exceeds its size budget, the oldest entry is removed.

Parameters

infos

Gate information to cache.

Returns

true if the entry was newly inserted, false if it was already present.

Definition at line 26 of file CircuitCache.cpp.

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Member Data Documentation

current_size

unsigned CircuitCache::current_size

private

Current total byte usage of cached entries.

Definition at line 82 of file CircuitCache.h.

il

item_list CircuitCache::il

private

The container holding cached entries.

Definition at line 81 of file CircuitCache.h.

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

• /home/pierre/git/software/provsql/src/CircuitCache.h
• /home/pierre/git/software/provsql/src/CircuitCache.cpp