Refactor memcache connection handling

Gemfile

@@ -38,8 +38,7 @@ gem 'SystemTimer', '>= 1.1.3', :require => 'system_timer', :platforms => :ruby_1
 gem 'httpclient'
 
 # Load memcache in case we are using it
-gem 'memcache-client'
-gem 'memcached'
+gem 'memcached', '>= 1.4.1'
 
 # Gems needed for running tests
 group :test do

Gemfile.lock

@@ -30,7 +30,7 @@ GEM
       i18n (~> 0.6)
       multi_json (~> 1.0)
     addressable (2.2.7)
-    arel (3.0.1)
+    arel (3.0.2)
     builder (3.0.0)
     cocaine (0.2.1)
     coffee-rails (3.2.2)
@@ -56,7 +56,7 @@ GEM
     httpclient (2.2.4)
     i18n (0.6.0)
     iconv (0.1)
-    journey (1.0.2)
+    journey (1.0.3)
     jquery-rails (2.0.0)
       railties (>= 3.2.0.beta, < 5.0)
       thor (~> 0.14)
@@ -67,8 +67,7 @@ GEM
       i18n (>= 0.4.0)
       mime-types (~> 1.16)
       treetop (~> 1.4.8)
-    memcache-client (1.8.5)
-    memcached (1.3.7)
+    memcached (1.4.1)
     mime-types (1.17.2)
     multi_json (1.1.0)
     multipart-post (1.1.5)
@@ -84,12 +83,12 @@ GEM
       multi_json (~> 1.0)
     open_id_authentication (1.1.0)
       rack-openid (~> 1.3)
-    paperclip (2.6.0)
+    paperclip (2.7.0)
       activerecord (>= 2.3.0)
       activesupport (>= 2.3.2)
       cocaine (>= 0.0.2)
       mime-types
-    pg (0.13.1)
+    pg (0.13.2)
     polyglot (0.3.3)
     rack (1.4.1)
     rack-cache (1.1)
@@ -164,8 +163,7 @@ DEPENDENCIES
   iconv
   jquery-rails
   libxml-ruby (>= 2.0.5)
-  memcache-client
-  memcached
+  memcached (>= 1.4.1)
   oauth-plugin (>= 0.4.0.pre7)
   open_id_authentication (>= 1.1.0)
   paperclip (~> 2.0)

config/environments/production.rb

@@ -49,8 +49,7 @@ OpenStreetMap::Application.configure do
 
   # Use a different cache store in production
   if defined?(MEMCACHE_SERVERS)
-    MEMCACHE = Memcached::Rails.new(MEMCACHE_SERVERS, :binary_protocol => true)
-    config.cache_store = :mem_cache_store, MEMCACHE
+    config.cache_store = :mem_cache_store, MemCache.new(:namespace => "rails:cache")
   end
 
   # Enable serving of images, stylesheets, and JavaScripts from an asset server

config/initializers/memcached.rb

@@ -1,9 +0,0 @@
-if defined?(PhusionPassenger) and defined?(MEMCACHE_SERVERS)
-  PhusionPassenger.on_event(:starting_worker_process) do |forked|
-    if forked
-      MEMCACHE = MEMCACHE.clone
-      RAILS_CACHE = ActiveSupport::Cache::MemCacheStore.new(MEMCACHE, :compress => true)
-      ActionController::Base.cache_store = RAILS_CACHE
-    end
-  end
-end

lib/mem_cache.rb

@@ -0,0 +1,31 @@
+class MemCache < Memcached::Rails
+  DEFAULT_OPTIONS = Memcached::DEFAULTS.merge(Memcached::Rails::DEFAULTS)
+
+  MemCacheError = Memcached::Error
+
+  @@connections = []
+
+  def initialize(options = {})
+    options.reverse_merge! :binary_protocol => true, :namespace_separator => ":"
+
+    super(MEMCACHE_SERVERS, options)
+
+    @@connections.push(self)
+
+    ObjectSpace.define_finalizer(self, lambda { |connection|
+      @@connections.remove(connection)
+    })
+  end
+
+  def self.connections
+    @@connections
+  end
+end
+
+if defined?(PhusionPassenger)
+  PhusionPassenger.on_event(:starting_worker_process) do |forked|
+    if forked
+      MemCache.connections.each { |connection| connection.reset }
+    end
+  end
+end