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# Copyright (c) 2008 Michael Fellinger m.fellinger@gmail.com
# All files in this distribution are subject to the terms of the Ruby license.
require 'yaml/store'
module Ramaze
# Cache based on _whys YAML::Store, which uses PStore to serialize objects
# as YAML in a thread-safe manner.
class YAMLStoreCache
attr_accessor :file
# create a new YAML::Store with the given file (which will be created if it
# is not already there).
def initialize(file = 'cache.yaml')
@file = file
@cache = YAML::Store.new(file)
end
# return the values for given keys.
def values_at(*keys)
transaction do |y|
keys.map{|k| y[k]}
end
end
# Loads @file into memory via YAML::load_file
def underlying_yaml
YAML.load_file(@file)
end
# clears the YAML::Store based cache, by emptying the YAML file.
def clear
transaction do |y|
File.open(@file, 'w+'){|f| f.puts({}.to_yaml)}
end
end
# Deletes the key from YAML::Store based cache.
def delete(key)
transaction do |y|
y.delete(key)
end
end
# just a helper to use transactions.
def transaction(&block)
@cache.transaction do
yield(@cache)
end
end
# catch everything else and use a transaction to send it.
def method_missing(*args, &block)
transaction do |y|
y.send(*args, &block)
end
end
end
end
Version data entries
22 entries across 22 versions & 5 rubygems