added code to delete entry from concurrent hash(need review)

lib/reel/session/store.rb

@@ -5,6 +5,7 @@ module Reel
   module Session
     class Store
       include Crypto
+      include Celluloid
 
       def initialize request
 
@@ -32,11 +33,20 @@ def generate_id
         Celluloid::Internals::UUID.generate
       end
 
+      # start Celluloid timer to delete value from concurrent hash after expiry
+      def start_timer
+        return unless @key
+        @delete_time = after(@config[:session_length]){
+          @store.delete @key if @store
+        }
+      end
+
       def save
-        return nil if @val.empty?
+        return if @val.empty?
           # merge key,value
-          @key ||= generate_id
+          @key = generate_id
           @store.merge!({@key=>@val})
+          start_timer
           @key
       end