rel=me » railsbench http://rel.me programming, objective-c, cocoa, iphone, c Wed, 01 Feb 2012 07:26:50 +0000 en hourly 1 http://wordpress.org/?v=3.3.1 Fragment Cache Store with TTL http://rel.me/2007/02/21/fragment-cache-store-with-ttl/ http://rel.me/2007/02/21/fragment-cache-store-with-ttl/#comments Wed, 21 Feb 2007 05:26:00 +0000 admin /2007/09/03/fragment-cache-store-with-ttl I wanted to use a fragment cache, but I didn’t want to deal with expiring it. So I just made a self-expiring cache based on a TTL.

The fragment cache store just wants 4 methods: read, write, delete, delete_matched

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class Cache::MemStore

  attr_reader :ttl, :auto_expire
    
  def initialize(options = {})
    @ttl = options[:ttl] || 10.minutes
    @cache = {}
  end
    
  def expire(pattern)
    @cache.each { |key, val| delete key if key =~ pattern }
  end
  
  def read(key, options)
    delete(key, options) and return if is_expired?(key)
    return @cache[key][:content] if @cache.has_key? key
  end
  
  def write(key, content, options)
    @cache[key] = { :content => content, :created_on => Time.now }
  end
  
  def delete_matched(pattern, options)
    expire pattern
  end
  
  def delete(key, options)
    @cache.delete key
  end
  
  def is_expired?(key)
    if @cache.has_key? key
      created_on = @cache[key][:created_on]
      return Time.now > (created_on + @ttl)
    end
  end
  
end

Then in your environment.rb put: 



ActionController::Base.fragment_cache_store = Cache::MemStore.new(:ttl => 10.minutes)

railsbench gave me the following results:

page request                                      total  stddev%     r/s    ms/r
with cache: /                                   7.23471   2.8012   13.82   72.35
nocache:    /                                  25.81057   0.6966    3.87  258.11
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