1 files changed, 36 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/file_watcher.rb b/activesupport/lib/active_support/file_watcher.rb
new file mode 100644
index 0000000000..81e63e76a7
--- /dev/null
+++ b/activesupport/lib/active_support/file_watcher.rb
@@ -0,0 +1,36 @@
+module ActiveSupport
+  class FileWatcher
+    class Backend
+      def initialize(path, watcher)
+        @watcher = watcher
+        @path    = path
+      end
+
+      def trigger(files)
+        @watcher.trigger(files)
+      end
+    end
+
+    def initialize
+      @regex_matchers = {}
+    end
+
+    def watch(pattern, &block)
+      @regex_matchers[pattern] = block
+    end
+
+    def trigger(files)
+      trigger_files = Hash.new { |h,k| h[k] = Hash.new { |h2,k2| h2[k2] = [] } }
+
+      files.each do |file, state|
+        @regex_matchers.each do |pattern, block|
+          trigger_files[block][state] << file if pattern === file
+        end
+      end
+
+      trigger_files.each do |block, payload|
+        block.call payload
+      end
+    end
+  end
+end