moving toward push parser integration

benchs/parse_vs_push.rb

@@ -0,0 +1,60 @@
+require 'benchmark'
+require 'rubygems'
+require 'nokogiri'
+
+class Parser < Nokogiri::XML::SAX::Document
+
+  attr_reader :response
+
+  def initialize
+    reset
+  end
+
+  def reset
+    @item = {}
+    @response = { :items => [] }
+  end
+
+  def characters(string)
+    @value << string.strip
+  end
+
+  def start_element(name, attrs = [])
+    @value = ''
+  end
+
+  def end_element(name)
+    case name
+    when 'item'
+      @response[:items] << @item
+      @item = {}
+    when 'key'
+      @item[:key] = @value
+    end
+  end
+
+end
+
+data = <<-DATA
+<items>
+  <item>
+    <key>value</key>
+  </item>
+</items>
+DATA
+
+COUNT = 100
+
+Benchmark.bmbm(25) do |bench|
+  bench.report('parse') do
+    parser = Parser.new
+    Nokogiri::XML::SAX::Parser.new(parser).parse(data)
+    parser.response
+  end
+
+  bench.report('push') do
+    parser = Parser.new
+    Nokogiri::XML::SAX::PushParser.new(parser).write(data, true)
+    parser.response
+  end
+end

lib/fog/aws/ec2.rb

@@ -391,7 +391,7 @@ module Fog
         })
 
         if parser && !response.body.empty?
-          Nokogiri::XML::SAX::Parser.new(parser).parse(response.body)
+          Nokogiri::XML::SAX::PushParser.new(parser).write(response.body, true)
           response.body = parser.response
         end
 

lib/fog/aws/s3.rb

@@ -300,7 +300,7 @@ DATA
         })
 
         if params[:parser] && !response.body.empty?
-          Nokogiri::XML::SAX::Parser.new(params[:parser]).parse(response.body)
+          Nokogiri::XML::SAX::PushParser.new(params[:parser]).write(response.body, true)
           response.body = params[:parser].response
         end
 

lib/fog/aws/simpledb.rb

@@ -333,7 +333,7 @@ module Fog
         })
 
         if parser && !response.body.empty?
-          Nokogiri::XML::SAX::Parser.new(parser).parse(response.body)
+          Nokogiri::XML::SAX::PushParser.new(parser).write(response.body, true)
           response.body = parser.response
         end