Add memcachier caching

Gemfile

@@ -12,6 +12,8 @@ gem 'sinatra-config-file'
 gem 'json'
 gem 'tux'
 gem 'googlecharts', :git => 'git://github.com/mattetti/googlecharts.git'
+gem 'dalli'
+gem 'memcachier'
 
 group :development do
   gem 'shotgun'

Gemfile.lock

@@ -12,6 +12,7 @@ GEM
     bond (0.4.1)
     bson_ext (1.3.1)
     daemons (1.1.4)
+    dalli (2.6.0)
     data_mapper (1.0.2)
       dm-aggregates (= 1.0.2)
       dm-constraints (= 1.0.2)
@@ -66,6 +67,7 @@ GEM
     haml (3.1.3)
     json (1.5.3)
     json_pure (1.6.5)
+    memcachier (0.0.2)
     rack (1.3.2)
     rack-test (0.6.0)
       rack (>= 1.0)
@@ -106,12 +108,14 @@ PLATFORMS
 
 DEPENDENCIES
   bson_ext
+  dalli
   data_mapper
   dm-ar-finders
   dm-postgres-adapter
   googlecharts!
   haml
   json
+  memcachier
   rack-test
   sass
   shotgun

cataloguais.rb

@@ -27,6 +27,8 @@
   # initialize the graph urls on startup
   set :graph_urls, {}
 
+  set :cache, Dalli::Client.new
+
 end
 
 configure :production do
@@ -79,7 +81,15 @@
           end
   @direction = params[:direction] || :asc
   @direction = @direction.to_sym if @direction
-  @items = Item.search_and_sort(@sort.dup, @direction, params[:search])
+
+  # try to fetch results from cache
+  cache_key = get_cache_key [@sort, @direction, params[:search]]
+  @items = settings.cache.get(cache_key)
+  if !@items
+    @items = Item.search_and_sort(@sort.dup, @direction, params[:search])
+    settings.cache.set(cache_key, @items)
+  end
+
   haml :index
 end
 
@@ -169,6 +179,10 @@
 # catch trailing spaces from https://gist.github.com/867165
 get %r{(.+)/$} do |r| redirect r; end;
 
+def get_cache_key(arr)
+  "#{Digest::MD5.hexdigest(arr.join('::'))}_#{Item.cache_key}"
+end
+
 # render the row of the table for a given partial
 def item_table_row(item)
   @fields ||= settings.fields + ['Added On']

models/item.rb

@@ -16,6 +16,10 @@ class Item
     alias :"field#{i}" :"#{field.robotize}"
   end
 
+  def self.cache_key
+    Item.max(:updated_at).strftime("%s")
+  end
+
   # Item.fields returns an array of field names
   def self.fields
     self.properties.collect{ |p| p.name }[1..-1]