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require 'benchmark'
module ActiveSupport
module Cache
def self.lookup_store(*store_option)
store, *parameters = *([ store_option ].flatten)
case store
when Symbol
store_class_name = (store == :drb_store ? "DRbStore" : store.to_s.camelize)
store_class = ActiveSupport::Cache.const_get(store_class_name)
store_class.new(*parameters)
when nil
ActiveSupport::Cache::MemoryStore.new
else
store
end
end
def self.expand_cache_key(key, namespace = nil)
expanded_cache_key = namespace ? "#{namespace}/" : ""
if ENV["RAILS_CACHE_ID"] || ENV["RAILS_APP_VERSION"]
expanded_cache_key << "#{ENV["RAILS_CACHE_ID"] || ENV["RAILS_APP_VERSION"]}/"
end
expanded_cache_key << case
when key.respond_to?(:cache_key)
key.cache_key
when key.is_a?(Array)
key.collect { |element| expand_cache_key(element) }.to_param
when key.respond_to?(:to_param)
key.to_param
end
expanded_cache_key
end
class Store
cattr_accessor :logger
def initialize
end
def threadsafe!
@mutex = Mutex.new
self.class.send :include, ThreadSafety
self
end
# Pass :force => true to force a cache miss.
def fetch(key, options = {})
@logger_off = true
if !options[:force] && value = read(key, options)
@logger_off = false
log("hit", key, options)
value
elsif block_given?
@logger_off = false
log("miss", key, options)
value = nil
seconds = Benchmark.realtime { value = yield }
@logger_off = true
write(key, value, options)
@logger_off = false
log("write (will save #{'%.5f' % seconds})", key, nil)
value
end
end
def read(key, options = nil)
log("read", key, options)
end
def write(key, value, options = nil)
log("write", key, options)
end
def delete(key, options = nil)
log("delete", key, options)
end
def delete_matched(matcher, options = nil)
log("delete matched", matcher.inspect, options)
end
def increment(key, amount = 1)
log("incrementing", key, amount)
if num = read(key)
write(key, num + amount)
else
nil
end
end
def decrement(key, amount = 1)
log("decrementing", key, amount)
if num = read(key)
write(key, num - amount)
else
nil
end
end
private
def log(operation, key, options)
logger.debug("Cache #{operation}: #{key}#{options ? " (#{options.inspect})" : ""}") if logger && !@logger_off
end
end
module ThreadSafety #:nodoc:
def read(key, options = nil) #:nodoc:
@mutex.synchronize { super }
end
def write(key, value, options = nil) #:nodoc:
@mutex.synchronize { super }
end
def delete(key, options = nil) #:nodoc:
@mutex.synchronize { super }
end
def delete_matched(matcher, options = nil) #:nodoc:
@mutex.synchronize { super }
end
end
end
end
require 'active_support/cache/file_store'
require 'active_support/cache/memory_store'
require 'active_support/cache/drb_store'
require 'active_support/cache/mem_cache_store'
require 'active_support/cache/compressed_mem_cache_store'
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