Remove duplicate ConcurrentHash

1 files changed, 0 insertions, 25 deletions

diff --git a/activesupport/lib/active_support/memoizable.rb b/activesupport/lib/active_support/memoizable.rb
index 8e9abeaf91..bd9dbb60fc 100644
--- a/activesupport/lib/active_support/memoizable.rb
+++ b/activesupport/lib/active_support/memoizable.rb
@@ -1,29 +1,4 @@
 module ActiveSupport
-  class ConcurrentHash
-    def initialize(hash = {})
-      @backup_cache = hash.dup
-      @frozen_cache = hash.dup.freeze
-      @mutex = Mutex.new
-    end
-
-    def []=(k,v)
-      @mutex.synchronize { @backup_cache[k] = v }
-      @frozen_cache = @backup_cache.dup.freeze
-    end
-
-    def [](k)
-      if @frozen_cache.key?(k)
-        @frozen_cache[k]
-      else
-        @mutex.synchronize { @backup_cache[k] }
-      end
-    end
-    
-    def empty?
-      @backup_cache.empty?
-    end
-  end
-  
   module SafelyMemoizable
     def safely_memoize(*symbols)
       symbols.each do |symbol|