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[redminele/redminele.git] / ruby / lib / ruby / gems / 1.8 / gems / activesupport-2.3.12 / lib / active_support / vendor / i18n-0.4.1 / i18n / backend / cache.rb

diff --git a/ruby/lib/ruby/gems/1.8/gems/activesupport-2.3.12/lib/active_support/vendor/i18n-0.4.1/i18n/backend/cache.rb b/ruby/lib/ruby/gems/1.8/gems/activesupport-2.3.12/lib/active_support/vendor/i18n-0.4.1/i18n/backend/cache.rb
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@@ -0,0 +1,77 @@
+# encoding: utf-8
+
+# This module allows you to easily cache all responses from the backend - thus
+# speeding up the I18n aspects of your application quite a bit.
+#
+# To enable caching you can simply include the Cache module to the Simple
+# backend - or whatever other backend you are using:
+#
+#  I18n::Backend::Simple.send(:include, I18n::Backend::Cache)
+#
+# You will also need to set a cache store implementation that you want to use:
+#
+#  I18n.cache_store = ActiveSupport::Cache.lookup_store(:memory_store)
+#
+# You can use any cache implementation you want that provides the same API as
+# ActiveSupport::Cache (only the methods #fetch and #write are being used).
+#
+# The cache_key implementation assumes that you only pass values to
+# I18n.translate that return a valid key from #hash (see
+# http://www.ruby-doc.org/core/classes/Object.html#M000337).
+module I18n
+  class << self
+    @@cache_store = nil
+    @@cache_namespace = nil
+
+    def cache_store
+      @@cache_store
+    end
+
+    def cache_store=(store)
+      @@cache_store = store
+    end
+
+    def cache_namespace
+      @@cache_namespace
+    end
+
+    def cache_namespace=(namespace)
+      @@cache_namespace = namespace
+    end
+
+    def perform_caching?
+      !cache_store.nil?
+    end
+  end
+
+  module Backend
+    # TODO Should the cache be cleared if new translations are stored?
+    module Cache
+      def translate(*args)
+        I18n.perform_caching? ? fetch(*args) { super } : super
+      end
+
+      protected
+
+        def fetch(*args, &block)
+          result = I18n.cache_store.fetch(cache_key(*args), &block)
+          raise result if result.is_a?(Exception)
+          result = result.dup if result.frozen? rescue result
+          result
+        rescue MissingTranslationData => exception
+          I18n.cache_store.write(cache_key(*args), exception)
+          raise exception
+        end
+
+        def cache_key(*args)
+          # This assumes that only simple, native Ruby values are passed to I18n.translate.
+          # Also, in Ruby < 1.8.7 {}.hash != {}.hash
+          # (see http://paulbarry.com/articles/2009/09/14/why-rails-3-will-require-ruby-1-8-7)
+          # If args.inspect does not work for you for some reason, patches are very welcome :)
+          hash = RUBY_VERSION >= "1.8.7" ? args.hash : args.inspect
+          keys = ['i18n', I18n.cache_namespace, hash]
+          keys.compact.join('-')
+        end
+    end
+  end
+end
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