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|
=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
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