From 0a86122a248020081722bf0c12de70c929cbcbd9 Mon Sep 17 00:00:00 2001
From: David Heinemeier Hansson <david@loudthinking.com>
Date: Sun, 26 Nov 2006 22:10:55 +0000
Subject: Only reload connections in development mode that supports (and
 requires that) -- in other words, only do it for SQLite (closes #6687, #6700)
 [DHH]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@5637 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
---
 .../connection_adapters/abstract/connection_specification.rb      | 8 ++++++++
 .../lib/active_record/connection_adapters/abstract_adapter.rb     | 6 ++++++
 .../lib/active_record/connection_adapters/sqlite_adapter.rb       | 4 ++++
 railties/lib/dispatcher.rb                                        | 7 +++++--
 4 files changed, 23 insertions(+), 2 deletions(-)

diff --git a/activerecord/lib/active_record/connection_adapters/abstract/connection_specification.rb b/activerecord/lib/active_record/connection_adapters/abstract/connection_specification.rb
index ae59176fa3..31c288b932 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract/connection_specification.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract/connection_specification.rb
@@ -86,6 +86,14 @@ module ActiveRecord
           conn.disconnect!
         end
       end
+      
+      # Clears the cache which maps classes 
+      def clear_reloadable_connections!
+        @@active_connections.each do |name, conn|
+          conn.disconnect! if conn.supports_reloading?
+          @@active_connections.delete(name)
+        end
+      end
 
       # Verify active connections.
       def verify_active_connections! #:nodoc:
diff --git a/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb b/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb
index 949b8f7951..07e3182761 100755
--- a/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb
@@ -79,6 +79,12 @@ module ActiveRecord
         @active = false
       end
 
+      # Returns true if its safe to reload the connection between requests for development mode.
+      # This is not the case for Ruby/MySQL and it's not necessary for any adapters except SQLite.
+      def supports_reloading?
+        false
+      end
+
       # Lazily verify this connection, calling +active?+ only if it hasn't
       # been called for +timeout+ seconds.       
       def verify!(timeout)
diff --git a/activerecord/lib/active_record/connection_adapters/sqlite_adapter.rb b/activerecord/lib/active_record/connection_adapters/sqlite_adapter.rb
index b0c86f51a5..341e546084 100644
--- a/activerecord/lib/active_record/connection_adapters/sqlite_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/sqlite_adapter.rb
@@ -102,6 +102,10 @@ module ActiveRecord
         true
       end
 
+      def supports_reloading?
+        true
+      end
+
       def supports_count_distinct? #:nodoc:
         sqlite_version >= '3.2.6'
       end
diff --git a/railties/lib/dispatcher.rb b/railties/lib/dispatcher.rb
index ce6f505895..31eb5d2317 100644
--- a/railties/lib/dispatcher.rb
+++ b/railties/lib/dispatcher.rb
@@ -62,7 +62,7 @@ class Dispatcher
         Class.remove_class(*Reloadable.reloadable_classes)
       end
         
-      ActiveRecord::Base.clear_active_connections! if defined?(ActiveRecord)
+      ActiveRecord::Base.clear_reloadable_connections! if defined?(ActiveRecord)
     end
     
     # Add a preparation callback. Preparation callbacks are run before every
@@ -76,13 +76,16 @@ class Dispatcher
     def to_prepare(identifier = nil, &block)
       unless identifier.nil?
         callback = preparation_callbacks.detect { |ident, _| ident == identifier }
+
         if callback # Already registered: update the existing callback
           callback[-1] = block
           return
         end
       end
+
       preparation_callbacks << [identifier, block]
-      nil
+
+      return
     end
 
     private
-- 
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