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require 'set'
module Moneta
# Locks the underlying stores with a Mutex
# @api public
class Lock < Wrapper
# @param [Moneta store] adapter The underlying store
# @param [Hash] options
# @option options [String] :mutex (::Mutex.new) Mutex object
def initialize(adapter, options = {})
super
@lock = options[:mutex] || ::Mutex.new
end
protected
def wrap(name, *args, &block)
self.locks ||= Set.new
if locked?
yield
else
lock!(&block)
end
end
def locks=(locks)
Thread.current.thread_variable_set('Moneta::Lock', locks)
end
def locks
Thread.current.thread_variable_get('Moneta::Lock')
end
def lock!(&block)
locks << @lock
@lock.synchronize(&block)
ensure
locks.delete @lock
end
def locked?
locks.include? @lock
end
end
end
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