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Add infrastructure for automated expiration of storage entries

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This is used for backends that don't support expiration natively.
This commit is contained in:
Tim Wojtulewicz 2024-12-06 15:29:15 -07:00
parent 8dee733a7d
commit d07d27453a
12 changed files with 96 additions and 21 deletions
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16
src/storage/Backend.h
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@ -32,10 +32,12 @@ public:
* @param key the key for the pair
* @param value the value for the pair
* @param overwrite whether an existing value for a key should be overwritten.
* @return A result pair containing a bool with the success state, and a
* possible error string if the operation failed.
* @param expiration_time the time when this entry should be automatically
* removed. Set to zero to disable expiration.
* @return An optional value potentially containing an error string if
* needed. Will be unset if the operation succeeded.
*/
ErrorResult Put(ValPtr key, ValPtr value, bool overwrite = true);
ErrorResult Put(ValPtr key, ValPtr value, bool overwrite = true, double expiration_time = 0);
/**
* Retrieve a value from the backend for a provided key.
@ -99,7 +101,7 @@ protected:
/**
* The workhorse method for Put().
*/
virtual ErrorResult DoPut(ValPtr key, ValPtr value, bool overwrite = true) = 0;
virtual ErrorResult DoPut(ValPtr key, ValPtr value, bool overwrite = true, double expiration_time = 0) = 0;
/**
* The workhorse method for Get().
@ -111,6 +113,12 @@ protected:
*/
virtual ErrorResult DoErase(ValPtr key) = 0;
/**
* Removes any entries in the backend that have expired. Can be overridden by
* derived classes.
*/
virtual void Expire() {}
TypePtr key_type;
TypePtr val_type;