File: //usr/lib/ruby/vendor_ruby/moneta/adapters/pstore.rb
require 'pstore'
require 'fileutils'
module Moneta
module Adapters
# PStore backend
# @api public
class PStore
include Defaults
supports :create, :increment
attr_reader :backend
# @param [Hash] options
# @option options [String] :file PStore file
# @option options [::PStore] :backend Use existing backend instance
def initialize(options = {})
@backend = options[:backend] ||
begin
raise ArgumentError, 'Option :file is required' unless options[:file]
FileUtils.mkpath(::File.dirname(options[:file]))
new_store(options)
end
end
# (see Proxy#key?)
def key?(key, options = {})
@backend.transaction(true) { @backend.root?(key) }
end
# (see Proxy#load)
def load(key, options = {})
@backend.transaction(true) { @backend[key] }
end
# (see Proxy#store)
def store(key, value, options = {})
@backend.transaction { @backend[key] = value }
end
# (see Proxy#delete)
def delete(key, options = {})
@backend.transaction { @backend.delete(key) }
end
# (see Proxy#increment)
def increment(key, amount = 1, options = {})
@backend.transaction do
value = Utils.to_int(@backend[key]) + amount
@backend[key] = value.to_s
value
end
end
# (see Proxy#create)
def create(key, value, options = {})
@backend.transaction do
if @backend.root?(key)
false
else
@backend[key] = value
true
end
end
end
# (see Proxy#clear)
def clear(options = {})
@backend.transaction do
@backend.roots.each do |key|
@backend.delete(key)
end
end
self
end
protected
def new_store(options)
::PStore.new(options[:file], options[:threadsafe])
end
end
end
end