require ''rubygems''
require ''active_support''
cache = ActiveSupport::Cache.lookup_store(:memory_store)
#cache=Rails.cache
def cache.fetch(key,options={})
second=options.delete(:expires_in).to_i
raise "cache_fetch method second can not blow zero" if
second<=0
time_tag = ((Time.now.to_i/second)*second)
expires_key = [time_tag,key]
p expires_key
instance_eval{@data.delete_if{|k,v|
Time.now.to_i>k.first+second}}
super(expires_key,options){yield}
end
puts cache.fetch(''test'',:expires_in=>3.seconds){rand}
puts cache.fetch(''test'',:expires_in=>3.seconds){rand}
sleep 4
puts cache.fetch(''test'',:expires_in=>3.seconds){rand}
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