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Name	Size	Permission	Date
acl.rb	4.65 KB	-rw-r--r--	2011-05-19 00:07
drb.rb	55.4 KB	-rw-r--r--	2013-11-09 23:13
eq.rb	244 B	-rw-r--r--	2013-01-25 03:25
extserv.rb	1.2 KB	-rw-r--r--	2013-01-25 03:25
extservm.rb	1.71 KB	-rw-r--r--	2012-04-22 11:35
gw.rb	2.97 KB	-rw-r--r--	2013-01-25 03:25
invokemethod.rb	746 B	-rw-r--r--	2013-07-23 00:28
observer.rb	636 B	-rw-r--r--	2013-01-25 03:25
ssl.rb	11.51 KB	-rw-r--r--	2013-12-13 16:11
timeridconv.rb	2.11 KB	-rw-r--r--	2013-01-25 03:25
unix.rb	2.72 KB	-rw-r--r--	2013-01-25 03:25

Rename

=begin
 external service manager
        Copyright (c) 2000 Masatoshi SEKI
=end

require 'drb/drb'
require 'thread'
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 = 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?
          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 true
          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