From a739d1df96721d35082161ae0c52902080962e51 Mon Sep 17 00:00:00 2001
From: nsensfel <SpamShield0@noot-noot.org>
Date: Tue, 7 Nov 2017 17:29:16 +0100
Subject: Working on handler-side client state storage.

---
 src/timed_cache_manager.erl | 76 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 76 insertions(+)
 create mode 100644 src/timed_cache_manager.erl

(limited to 'src')

diff --git a/src/timed_cache_manager.erl b/src/timed_cache_manager.erl
new file mode 100644
index 0000000..45b013c
--- /dev/null
+++ b/src/timed_cache_manager.erl
@@ -0,0 +1,76 @@
+-module(timed_cache_manager).
+-export(
+   [
+      new/2,
+      start/1,
+      fetch/2
+   ]
+).
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%% LOCAL %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+%%%% Manager %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+manager_core_loop (DB) ->
+   receive
+      terminate -> ets:delete(DB)
+   end.
+
+new_database (DB) ->
+   ets:new(
+      DB,
+      [
+         set,
+         public,
+         {keypos, 1},
+         {read_concurrency, true}
+      ]
+   ).
+
+%%%% Timer %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+timer_cleanup (DB, ObjectID) ->
+   ets:delete(DB, ObjectID).
+
+timer_core_loop (DB, ObjectID, Timeout) ->
+   receive
+      ok -> timer_core_loop(DB, ObjectID, Timeout);
+      terminate -> ok
+   after Timeout ->
+      timer_cleanup(DB, ObjectID)
+   end.
+
+add_timer (DB, ObjectID, Timeout) ->
+   spawn(timed_cache_manager, timer_core_loop, [DB, ObjectID, Timeout]).
+
+add_to_cache (DB, ObjectID) ->
+   TimerPID = add_timer(DB, ObjectID, 60000),
+   Data = nothing, %% Do the actual NoSQL Fetch here.
+   ets:insert(DB, {ObjectID, TimerPID, Data}),
+   Data.
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%% EXPORTED %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+new (Manager, DB) ->
+   register(
+      Manager,
+      spawn(
+         timed_cache_manager,
+         start,
+         [DB]
+      )
+   ).
+
+start (DB) ->
+   new_database(DB),
+   manager_core_loop(DB).
+
+fetch (DB, ObjectID) ->
+   case ets:lookup(DB, ObjectID) of
+      [] ->
+         add_to_cache(DB, ObjectID);
+
+      [{_, TimerPID, Data}] ->
+         TimerPID ! ok,
+         Data
+   end.
-- 
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