1 files changed, 66 insertions, 0 deletions
diff --git a/actionpack/lib/abstract_controller/caching.rb b/actionpack/lib/abstract_controller/caching.rb
new file mode 100644
index 0000000000..ce6b757c3c
--- /dev/null
+++ b/actionpack/lib/abstract_controller/caching.rb
@@ -0,0 +1,66 @@
+# frozen_string_literal: true
+
+module AbstractController
+  module Caching
+    extend ActiveSupport::Concern
+    extend ActiveSupport::Autoload
+
+    eager_autoload do
+      autoload :Fragments
+    end
+
+    module ConfigMethods
+      def cache_store
+        config.cache_store
+      end
+
+      def cache_store=(store)
+        config.cache_store = ActiveSupport::Cache.lookup_store(store)
+      end
+
+      private
+        def cache_configured?
+          perform_caching && cache_store
+        end
+    end
+
+    include ConfigMethods
+    include AbstractController::Caching::Fragments
+
+    included do
+      extend ConfigMethods
+
+      config_accessor :default_static_extension
+      self.default_static_extension ||= ".html"
+
+      config_accessor :perform_caching
+      self.perform_caching = true if perform_caching.nil?
+
+      config_accessor :enable_fragment_cache_logging
+      self.enable_fragment_cache_logging = false
+
+      class_attribute :_view_cache_dependencies, default: []
+      helper_method :view_cache_dependencies if respond_to?(:helper_method)
+    end
+
+    module ClassMethods
+      def view_cache_dependency(&dependency)
+        self._view_cache_dependencies += [dependency]
+      end
+    end
+
+    def view_cache_dependencies
+      self.class._view_cache_dependencies.map { |dep| instance_exec(&dep) }.compact
+    end
+
+    private
+      # Convenience accessor.
+      def cache(key, options = {}, &block) # :doc:
+        if cache_configured?
+          cache_store.fetch(ActiveSupport::Cache.expand_cache_key(key, :controller), options, &block)
+        else
+          yield
+        end
+      end
+  end
+end