Refactor how details are handled for template selection

actionmailer/lib/action_mailer.rb

@@ -107,5 +107,5 @@ def _deliver_all_later(delivery_method, *deliveries, **options)
 ActiveSupport.on_load(:action_view) do
   ActionView::Base.default_formats ||= Mime.symbols
   ActionView::Template.mime_types_implementation = Mime
-  ActionView::LookupContext::DetailsKey.clear
+  ActionView::LookupContext.clear
 end

actionpack/lib/action_dispatch.rb

@@ -163,5 +163,5 @@ def self.eager_load!
 ActiveSupport.on_load(:action_view) do
   ActionView::Base.default_formats ||= Mime.symbols
   ActionView::Template.mime_types_implementation = Mime
-  ActionView::LookupContext::DetailsKey.clear
+  ActionView::LookupContext.clear
 end

actionpack/test/controller/mime/respond_to_test.rb

@@ -336,7 +336,7 @@ def setup
     Mime::Type.register("text/x-mobile", :mobile)
     Mime::Type.register("application/fancy-xml", :fancy_xml)
     Mime::Type.register("text/html; fragment", :html_fragment)
-    ActionView::LookupContext::DetailsKey.clear
+    ActionView::LookupContext.clear
   end
 
   def teardown
@@ -345,7 +345,7 @@ def teardown
     Mime::Type.unregister(:mobile)
     Mime::Type.unregister(:fancy_xml)
     Mime::Type.unregister(:html_fragment)
-    ActionView::LookupContext::DetailsKey.clear
+    ActionView::LookupContext.clear
   end
 
   def test_html_fragment

actionpack/test/controller/render_test.rb

@@ -354,11 +354,11 @@ def modify_template(name)
       key = name + ".erb"
       original = hash[key]
       hash[key] = "#{original} Modified!"
-      ActionView::LookupContext::DetailsKey.clear
+      ActionView::LookupContext.clear
       yield
     ensure
       hash[key] = original
-      ActionView::LookupContext::DetailsKey.clear
+      ActionView::LookupContext.clear
     end
 end
 

actionview/lib/action_view/cache_expiry.rb

@@ -52,7 +52,7 @@ def deactivate
 
       private
         def reload!
-          ActionView::LookupContext::DetailsKey.clear
+          ActionView::LookupContext.clear
         end
 
         def build_watcher

actionview/lib/action_view/digestor.rb

@@ -1,12 +1,26 @@
 # frozen_string_literal: true
 
+require "concurrent/map"
 require "action_view/dependency_tracker"
 
 module ActionView
   class Digestor
     @@digest_mutex = Mutex.new
+    @cache = Concurrent::Map.new
 
     class << self
+      def cache(details_key)
+        @cache[details_key] ||= Concurrent::Map.new
+      end
+
+      def digest_caches
+        @cache.values
+      end
+
+      def clear_cache
+        @cache.clear
+      end
+
       # Supported options:
       #
       # * <tt>name</tt>         - Template name