Packages

launchdarkly_server_sdk

2.1.2
3.11.0 3.10.1 3.9.0 3.8.1 3.8.0 3.7.2 3.7.1 3.7.0 3.6.0 3.5.0 3.4.0 3.3.1 3.3.0 3.2.0 3.1.0 3.0.4 3.0.3 3.0.2 3.0.1 3.0.0 2.1.2 2.1.1 2.1.0 2.0.5 2.0.4 2.0.3 2.0.2 2.0.1 2.0.0 1.6.0 1.5.0 1.4.0 1.3.2 1.3.1 1.3.0 1.2.0 1.1.3 1.1.2 1.1.1 retired 1.1.0 retired 1.0.1 retired 1.0.0 retired 1.0.0-beta4 retired 1.0.0-beta3 retired 1.0.0-beta2 retired

LaunchDarkly SDK for Erlang

HexDocs

Current section

Files

Jump to
Readme
45 Versions
8 Dependencies
4 Dependants
Files
Activity
launchdarkly_server_sdk src ldclient_context_cache.erl
Raw

src/ldclient_context_cache.erl 

%%-------------------------------------------------------------------

%% @doc User LRU cache

%% @private

%% @end

%%-------------------------------------------------------------------



-module(ldclient_context_cache).



%% API

-export([get_local_reg_name/1]).

-export([notice_context/2]).



%%===================================================================

%% API

%%===================================================================



-spec get_local_reg_name(Tag :: atom()) -> atom().

get_local_reg_name(Tag) ->

    list_to_atom("ldclient_context_cache_" ++ atom_to_list(Tag)).



%% @doc Add to the set of the users we've noticed, and return true if the user

%% was already known to us.

%%

%% @end

-spec notice_context(Tag :: atom(), Context :: ldclient_context:context()) -> boolean().

notice_context(Tag, Context) ->

    CanonicalKey = ldclient_context:get_canonical_key(Context),

    notice_context_canonical_key(Tag, CanonicalKey).



-spec notice_context_canonical_key(Tag :: atom(), CanonicalKey :: binary()) -> boolean().

notice_context_canonical_key(_Tag, <<>>) ->

    %% Do not add to the cache. Returning true also means we should not send an index for this invalid user.

    true;

notice_context_canonical_key(Tag, CanonicalKey) ->

    CacheServer = get_local_reg_name(Tag),

    {Exists, _} = lru:contains_or_add(whereis(CacheServer), CanonicalKey, CanonicalKey),

    Exists.