Show a warning when trying to set Makara::Cache.store

lib/makara.rb

@@ -2,6 +2,7 @@
 require 'makara/railtie' if defined?(Rails)
 module Makara
 
+  autoload :Cache,              'makara/cache'
   autoload :ConfigParser,       'makara/config_parser'
   autoload :ConnectionWrapper,  'makara/connection_wrapper'
   autoload :Context,            'makara/context'

lib/makara/cache.rb

@@ -0,0 +1,20 @@
+module Makara
+  module Cache
+
+    class << self
+
+      def store=(store)
+        Logging::Logger.log deprecation_warning, :warn
+      end
+
+      private
+
+      def deprecation_warning
+        <<~WARN
+          Makara's context is no longer persisted in a backend cache, a cookie store is used by default.
+          Setting the Makara::Cache.store won't have any effects.
+        WARN
+      end
+    end
+  end
+end

spec/cache_spec.rb

@@ -0,0 +1,9 @@
+require 'spec_helper'
+
+describe Makara::Cache do
+
+  it 'shows a warning' do
+    expect(Makara::Logging::Logger).to receive(:log).with(/Setting the Makara::Cache\.store won't have any effects/, :warn)
+    described_class.store = :noop
+  end
+end