From 2658beb48f9c3310e84a2738b7c8293d4fc3dbd4 Mon Sep 17 00:00:00 2001
From: John Dong <jdong@mit.edu>
Date: Thu, 30 Aug 2007 19:12:35 -0400
Subject: [PATCH] Commit memcache work. memcache is only enabled in production,
 and currently only thing cached are election results. At least 5-fold render
 speed improvement...

---
 app/models/election.rb             | 23 +++++++++++++++++++++--
 config/environment.rb              |  1 -
 config/environments/development.rb |  3 ++-
 config/environments/production.rb  |  5 ++++-
 config/environments/test.rb        |  3 ++-
 5 files changed, 29 insertions(+), 6 deletions(-)

diff --git a/app/models/election.rb b/app/models/election.rb
index 9c6337f..ce7a0bc 100644
--- a/app/models/election.rb
+++ b/app/models/election.rb
@@ -88,8 +88,28 @@ class Election < ActiveRecord::Base
     longdesc.length > 0 ? longdesc : nil 
   end
   
-  #Calculate Election Results
+  #Calculate results if not in memcache
   def results
+    # Assignment is intentional
+    if Cache and c = Cache.get("election_results:#{id}:#{self.votes.length}")
+      @plurality_result = c['plurality']
+      @approval_result = c['approval']
+      @condorcet_result = c['condorcet']
+      @ssd_result = c['ssd']
+      @borda_result = c['borda']
+      return c
+    elsif Cache
+      # memcache is available, but missed.
+      results = self.results!
+      Cache.set("election_results:#{id}:#{self.votes.length}", results)
+      return results
+    else
+      return self.results!
+    end
+  end
+
+  #Always Calculate Election Results
+  def results!
     # initalize the tallies to empty arrays
     preference_tally = Array.new
     plurality_tally = Array.new
@@ -129,7 +149,6 @@ class Election < ActiveRecord::Base
     
     names
   end
-  
 end
 
 
diff --git a/config/environment.rb b/config/environment.rb
index 80f19b4..2a77009 100644
--- a/config/environment.rb
+++ b/config/environment.rb
@@ -65,7 +65,6 @@ require 'uniq_token'
 require 'randarray'
 require 'gruff'
 require 'sparklines'
-
 require 'rubyvote'
 ELECTION_TYPES = %w(ssd plurality approval condorcet borda)
 
diff --git a/config/environments/development.rb b/config/environments/development.rb
index 12a3e04..198c2bd 100644
--- a/config/environments/development.rb
+++ b/config/environments/development.rb
@@ -1,5 +1,6 @@
 # Settings specified here will take precedence over those in config/environment.rb
-
+#disable memcache
+Cache=nil
 # In the development environment your application's code is reloaded on
 # every request.  This slows down response time but is perfect for development
 # since you don't have to restart the webserver when you make code changes.
diff --git a/config/environments/production.rb b/config/environments/production.rb
index cb295b8..3192ef5 100644
--- a/config/environments/production.rb
+++ b/config/environments/production.rb
@@ -1,5 +1,8 @@
 # Settings specified here will take precedence over those in config/environment.rb
-
+#
+#Enable memcache
+require('memcache')
+Cache=MemCache.new('localhost', :compression => true)
 # The production environment is meant for finished, "live" apps.
 # Code is not reloaded between requests
 config.cache_classes = true
diff --git a/config/environments/test.rb b/config/environments/test.rb
index 7c2f617..a1a2608 100644
--- a/config/environments/test.rb
+++ b/config/environments/test.rb
@@ -1,5 +1,6 @@
 # Settings specified here will take precedence over those in config/environment.rb
-
+#disable memcache
+Cache=nil
 # The test environment is used exclusively to run your application's
 # test suite.  You never need to work with it otherwise.  Remember that
 # your test database is "scratch space" for the test suite and is wiped
-- 
2.30.2