1 files changed, 18 insertions, 4 deletions
diff --git a/activesupport/lib/active_support/notifications/fanout.rb b/activesupport/lib/active_support/notifications/fanout.rb
index 0ec23da073..cd60054862 100644
--- a/activesupport/lib/active_support/notifications/fanout.rb
+++ b/activesupport/lib/active_support/notifications/fanout.rb
@@ -1,10 +1,11 @@
 module ActiveSupport
   module Notifications
     # This is a default queue implementation that ships with Notifications. It
-    # just pushes events to all registered subscribers.
+    # just pushes events to all registered log subscribers.
     class Fanout
       def initialize
         @subscribers = []
+        @listeners_for = {}
       end
 
       def bind(pattern)
@@ -12,11 +13,22 @@ module ActiveSupport
       end
 
       def subscribe(pattern = nil, &block)
+        @listeners_for.clear
         @subscribers << Subscriber.new(pattern, &block)
+        @subscribers.last
       end
 
-      def publish(*args)
-        @subscribers.each { |s| s.publish(*args) }
+      def unsubscribe(subscriber)
+        @subscribers.delete(subscriber)
+        @listeners_for.clear
+      end
+
+      def publish(name, *args)
+        if listeners = @listeners_for[name]
+          listeners.each { |s| s.publish(name, *args) }
+        else
+          @listeners_for[name] = @subscribers.select { |s| s.publish(name, *args) }
+        end
       end
 
       # This is a sync queue, so there is not waiting.
@@ -48,7 +60,9 @@ module ActiveSupport
         end
 
         def publish(*args)
-          push(*args) if matches?(args.first)
+          return unless matches?(args.first)
+          push(*args)
+          true
         end
 
         def drained?