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# frozen_string_literal: false require_relative 'drb' require 'monitor' module DRb # Timer id conversion keeps objects alive for a certain amount of time after # their last access. The default time period is 600 seconds and can be # changed upon initialization. # # To use TimerIdConv: # # DRb.install_id_conv TimerIdConv.new 60 # one minute class TimerIdConv < DRbIdConv class TimerHolder2 # :nodoc: include MonitorMixin class InvalidIndexError < RuntimeError; end def initialize(keeping=600) super() @sentinel = Object.new @gc = {} @renew = {} @keeping = keeping @expires = nil end def add(obj) synchronize do rotate key = obj.__id__ @renew[key] = obj invoke_keeper return key end end def fetch(key) synchronize do rotate obj = peek(key) raise InvalidIndexError if obj == @sentinel @renew[key] = obj # KeepIt return obj end end private def peek(key) return @renew.fetch(key) { @gc.fetch(key, @sentinel) } end def invoke_keeper return if @expires @expires = Time.now + @keeping on_gc end def on_gc return unless Thread.main.alive? return if @expires.nil? Thread.new { rotate } if @expires < Time.now ObjectSpace.define_finalizer(Object.new) {on_gc} end def rotate synchronize do if @expires &.< Time.now @gc = @renew # GCed @renew = {} @expires = @gc.empty? ? nil : Time.now + @keeping end end end end # Creates a new TimerIdConv which will hold objects for +keeping+ seconds. def initialize(keeping=600) @holder = TimerHolder2.new(keeping) end def to_obj(ref) # :nodoc: return super if ref.nil? @holder.fetch(ref) rescue TimerHolder2::InvalidIndexError raise "invalid reference" end def to_id(obj) # :nodoc: return @holder.add(obj) end end end # DRb.install_id_conv(TimerIdConv.new)
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