2 files changed, 23 insertions, 6 deletions
diff --git a/activesupport/lib/active_support/notifications/fanout.rb b/activesupport/lib/active_support/notifications/fanout.rb
index 8f5fa646e8..6bf8c7d5de 100644
--- a/activesupport/lib/active_support/notifications/fanout.rb
+++ b/activesupport/lib/active_support/notifications/fanout.rb
@@ -25,9 +25,15 @@ module ActiveSupport
         subscriber
       end
 
-      def unsubscribe(subscriber)
+      def unsubscribe(subscriber_or_name)
         synchronize do
-          @subscribers.reject! { |s| s.matches?(subscriber) }
+          case subscriber_or_name
+          when String
+            @subscribers.reject! { |s| s.matches?(subscriber_or_name) }
+          else
+            @subscribers.delete(subscriber_or_name)
+          end
+
           @listeners_for.clear
         end
       end
@@ -97,12 +103,11 @@ module ActiveSupport
           end
 
           def subscribed_to?(name)
-            @pattern === name.to_s
+            @pattern === name
           end
 
-          def matches?(subscriber_or_name)
-            self === subscriber_or_name ||
-              @pattern && @pattern === subscriber_or_name
+          def matches?(name)
+            @pattern && @pattern === name
           end
         end
 
diff --git a/activesupport/lib/active_support/notifications/instrumenter.rb b/activesupport/lib/active_support/notifications/instrumenter.rb
index 3a244b34b5..075ddc2382 100644
--- a/activesupport/lib/active_support/notifications/instrumenter.rb
+++ b/activesupport/lib/active_support/notifications/instrumenter.rb
@@ -57,6 +57,18 @@ module ActiveSupport
         @duration       = nil
       end
 
+      # Returns the difference in milliseconds between when the execution of the
+      # event started and when it ended.
+      #
+      #   ActiveSupport::Notifications.subscribe('wait') do |*args|
+      #     @event = ActiveSupport::Notifications::Event.new(*args)
+      #   end
+      #
+      #   ActiveSupport::Notifications.instrument('wait') do
+      #     sleep 1
+      #   end
+      #
+      #   @event.duration # => 1000.138
       def duration
         @duration ||= 1000.0 * (self.end - time)
       end