don't want to setup a seperate cache? just use a Hash

lib/handlers/handlers.rb

@@ -33,11 +33,11 @@ def cache_class(name = nil)
     end
   end
 
-  %w(redis_handler memcache_handler).each do |handler|
+  %w(redis_handler memcache_handler hash_handler).each do |handler|
     require File.expand_path(File.dirname(__FILE__) + "/#{handler}")
   end
 
-  HANDLERS = [RedisHandler, MemCacheHandler]
+  HANDLERS = [RedisHandler, MemCacheHandler, HashHandler]
 
   def self.cache_handler_for(info)
     HANDLERS.detect{|handler| handler.handles?(info)}

lib/handlers/hash_handler.rb

@@ -0,0 +1,13 @@
+module Handlers
+  class HashHandler < Handler
+    cache_class "Hash"
+
+    def increment(key)
+      @cache[key] = (get(key)||0).to_i+1
+    end
+
+    def get(key)
+      @cache[key]
+    end
+  end
+end

test/test_api_throttling_hash.rb

@@ -0,0 +1,23 @@
+require File.expand_path(File.dirname(__FILE__) + '/test_helper')
+
+class TestApiThrottlingHash < Test::Unit::TestCase
+  include Rack::Test::Methods
+  include BasicTests
+  HASH = Hash.new
+
+  def app
+    app = Rack::Builder.new {
+      use ApiThrottling, :requests_per_hour => 3, :cache => HASH, :read_method=>"get", :write_method=>"add"
+      run lambda {|env| [200, {'Content-Type' =>  'text/plain', 'Content-Length' => '12'}, ["Hello World!"] ] }
+    }
+  end
+
+  def setup
+    HASH.replace({})
+  end
+
+  def test_cache_handler_should_be_memcache
+    assert_equal "Handlers::HashHandler", app.to_app.instance_variable_get(:@handler).to_s
+  end
+
+end