From 04d5eae4e835ead8ef785de4eb442893426f4b29 Mon Sep 17 00:00:00 2001
From: Brian Durand <brian@embellishedvisions.com>
Date: Mon, 12 Dec 2011 13:40:29 -0600
Subject: Add ActiveSupport::Cache::NullStore to expose caching interface
 without actually caching for development and test environments.

---
 activesupport/lib/active_support/cache.rb          |  1 +
 .../lib/active_support/cache/null_store.rb         | 44 ++++++++++++++++++++++
 2 files changed, 45 insertions(+)
 create mode 100644 activesupport/lib/active_support/cache/null_store.rb

(limited to 'activesupport/lib/active_support')

diff --git a/activesupport/lib/active_support/cache.rb b/activesupport/lib/active_support/cache.rb
index 07f5fcdeb3..9711ed6f73 100644
--- a/activesupport/lib/active_support/cache.rb
+++ b/activesupport/lib/active_support/cache.rb
@@ -16,6 +16,7 @@ module ActiveSupport
     autoload :FileStore, 'active_support/cache/file_store'
     autoload :MemoryStore, 'active_support/cache/memory_store'
     autoload :MemCacheStore, 'active_support/cache/mem_cache_store'
+    autoload :NullStore, 'active_support/cache/null_store'
 
     # These options mean something to all cache implementations. Individual cache
     # implementations may support additional options.
diff --git a/activesupport/lib/active_support/cache/null_store.rb b/activesupport/lib/active_support/cache/null_store.rb
new file mode 100644
index 0000000000..4427eaafcd
--- /dev/null
+++ b/activesupport/lib/active_support/cache/null_store.rb
@@ -0,0 +1,44 @@
+module ActiveSupport
+  module Cache
+    # A cache store implementation which doesn't actually store anything. Useful in
+    # development and test environments where you don't want caching turned on but
+    # need to go through the caching interface.
+    #
+    # This cache does implement the local cache strategy, so values will actually
+    # be cached inside blocks that utilize this strategy. See
+    # ActiveSupport::Cache::Strategy::LocalCache for more details.
+    class NullStore < Store
+      def initialize(options = nil)
+        super(options)
+        extend Strategy::LocalCache
+      end
+
+      def clear(options = nil)
+      end
+
+      def cleanup(options = nil)
+      end
+
+      def increment(name, amount = 1, options = nil)
+      end
+
+      def decrement(name, amount = 1, options = nil)
+      end
+
+      def delete_matched(matcher, options = nil)
+      end
+
+      protected
+        def read_entry(key, options) # :nodoc:
+        end
+
+        def write_entry(key, entry, options) # :nodoc:
+          true
+        end
+
+        def delete_entry(key, options) # :nodoc:
+          false
+        end
+    end
+  end
+end
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