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# Web::Persistent::Lock::Flock
# Copyright(c) 2002 MoonWolf <moonwolf@moonwolf.com>
module Web
class Persistent
module Lock
class Flock
def initialize(persistent_id, options={})
@persistent_id = persistent_id
@dir = options[:dir] || '/tmp'
prefix = options[:prefix] || 'lock_'
@path = File.join(@dir, prefix + persistent_id)
@f = nil
@locked = false
end
def lock
@locked = true
@f = @f || open(@path,'w')
@f.flock(File::LOCK_EX)
if block_given?
yield
unlock
end
end
def unlock
raise unless @f
@f.flock(File::LOCK_UN)
@locked = false
end
def delete
begin
File.unlink(@path)
if @f
@f.close
@f = nil
end
rescue Errno::ENOENT
end
end
end # Flock
end # Lock
end # Persistent
end # Web
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