From 03d3824d965f38d3c595330d697fb16dc9efdb9a Mon Sep 17 00:00:00 2001
From: Yehuda Katz <wycats@gmail.com>
Date: Wed, 28 Oct 2009 01:50:59 -0700
Subject: Make it possible to have IDs per request

---
 activesupport/lib/active_support/notifications.rb | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/activesupport/lib/active_support/notifications.rb b/activesupport/lib/active_support/notifications.rb
index 2cf91fc383..bf668964f5 100644
--- a/activesupport/lib/active_support/notifications.rb
+++ b/activesupport/lib/active_support/notifications.rb
@@ -45,7 +45,7 @@ module ActiveSupport
     mattr_accessor :queue
 
     class << self
-      delegate :instrument, :to => :instrumenter
+      delegate :instrument, :transaction_id, :generate_id, :to => :instrumenter
 
       def instrumenter
         Thread.current[:notifications_instrumeter] ||= Instrumenter.new(publisher)
@@ -63,7 +63,18 @@ module ActiveSupport
     class Instrumenter
       def initialize(publisher)
         @publisher = publisher
-        @id        = SecureRandom.hex(10)
+        @id        = random_id
+      end
+
+      def transaction
+        @id, old_id = random_id, @id
+        yield
+      ensure
+        @id = old_id
+      end
+
+      def transaction_id
+        @id
       end
 
       def instrument(name, payload={})
@@ -72,6 +83,11 @@ module ActiveSupport
       ensure
         @publisher.publish(name, time, Time.now, result, @id, payload)
       end
+
+    private
+      def random_id
+        SecureRandom.hex(10)
+      end
     end
 
     class Publisher
-- 
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