forked from Telodendria/Telodendria
Copy diagram from scrap paper into code for clarity.
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19
src/Db.c
19
src/Db.c
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@ -40,6 +40,25 @@ struct Db
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size_t maxCache;
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HashMap *cache;
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/*
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* The cache uses a double linked list (see DbRef
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* below) to know which objects are most and least
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* recently used. The following diagram helps me
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* know what way all the pointers go, because it
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* can get very confusing sometimes. For example,
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* there's nothing stopping "next" from pointing to
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* least recent, and "prev" from pointing to most
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* recent, so hopefully this clarifies the pointer
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* terminology used when dealing with the linked
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* list:
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*
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* mostRecent leastRecent
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* | prev prev | prev
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* +---+ ---> +---+ ---> +---+ ---> NULL
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* |ref| |ref| |ref|
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* NULL <--- +---+ <--- +---+ <--- +---+
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* next next next
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*/
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DbRef *mostRecent;
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DbRef *leastRecent;
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};
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