Haxl.Core.DataCache

A cache mapping data requests to their results.

Documentation

data DataCache

The DataCache maps things of type f a to ResultVar a, for any f and a provided f a is an instance of Typeable. In practice f a will be a request type parameterised by its result.

See the definition of ResultVar for more details.

empty :: DataCache

A new, empty DataCache.

insert

Arguments

:: (Hashable (r a), Typeable (r a), Eq (r a), Show (r a), Show a)

=> r a

Request

-> ResultVar a

Result

-> DataCache

-> DataCache

Inserts a request-result pair into the DataCache.

lookup

Arguments

:: Typeable (r a)

=> r a

Request

-> DataCache

-> Maybe (ResultVar a)

Looks up the cached result of a request.

showCache :: DataCache -> IO [(TypeRep, [(String, Either SomeException String)])]

Dumps the contents of the cache, with requests and responses converted to Strings using show. The entries are grouped by TypeRep.