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Dir : ~/usr/lib/ruby/2.7.0/drb/

Edit File: extservm.rb

# frozen_string_literal: false
=begin
 external service manager
        Copyright (c) 2000 Masatoshi SEKI
=end

require_relative 'drb'
require 'monitor'

module DRb
  class ExtServManager
    include DRbUndumped
    include MonitorMixin

@@command = {}

def self.command
      @@command
    end

def self.command=(cmd)
      @@command = cmd
    end

def initialize
      super()
      @cond = new_cond
      @servers = {}
      @waiting = []
      @queue = Thread::Queue.new
      @thread = invoke_thread
      @uri = nil
    end
    attr_accessor :uri

def service(name)
      synchronize do
        while true
          server = @servers[name]
          return server if server && server.alive? # server may be `false'
          invoke_service(name)
          @cond.wait
        end
      end
    end

def regist(name, ro)
      synchronize do
        @servers[name] = ro
        @cond.signal
      end
      self
    end

def unregist(name)
      synchronize do
        @servers.delete(name)
      end
    end

private
    def invoke_thread
      Thread.new do
        while name = @queue.pop
          invoke_service_command(name, @@command[name])
        end
      end
    end

def invoke_service(name)
      @queue.push(name)
    end

def invoke_service_command(name, command)
      raise "invalid command. name: #{name}" unless command
      synchronize do
        return if @servers.include?(name)
        @servers[name] = false
      end
      uri = @uri || DRb.uri
      if command.respond_to? :to_ary
        command = command.to_ary + [uri, name]
        pid = spawn(*command)
      else
        pid = spawn("#{command} #{uri} #{name}")
      end
      th = Process.detach(pid)
      th[:drb_service] = name
      th
    end
  end
end