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require 'drb/drb'
require 'monitor'
module DRb
# Gateway id conversion forms a gateway between different DRb protocols or
# networks.
#
# The gateway needs to install this id conversion and create servers for
# each of the protocols or networks it will be a gateway between. It then
# needs to create a server that attaches to each of these networks. For
# example:
#
# require 'drb/drb'
# require 'drb/unix'
# require 'drb/gw'
#
# DRb.install_id_conv DRb::GWIdConv.new
# gw = DRb::GW.new
# s1 = DRb::DRbServer.new 'drbunix:/path/to/gateway', gw
# s2 = DRb::DRbServer.new 'druby://example:10000', gw
#
# s1.thread.join
# s2.thread.join
#
# Each client must register services with the gateway, for example:
#
# DRb.start_service 'drbunix:', nil # an anonymous server
# gw = DRbObject.new nil, 'drbunix:/path/to/gateway'
# gw[:unix] = some_service
# DRb.thread.join
class GWIdConv < DRbIdConv
def to_obj(ref) # :nodoc:
if Array === ref && ref[0] == :DRbObject
return DRbObject.new_with(ref[1], ref[2])
end
super(ref)
end
end
# The GW provides a synchronized store for participants in the gateway to
# communicate.
class GW
include MonitorMixin
# Creates a new GW
def initialize
super()
@hash = {}
end
# Retrieves +key+ from the GW
def [](key)
synchronize do
@hash[key]
end
end
# Stores value +v+ at +key+ in the GW
def []=(key, v)
synchronize do
@hash[key] = v
end
end
end
class DRbObject # :nodoc:
def self._load(s)
uri, ref = Marshal.load(s)
if DRb.uri == uri
return ref ? DRb.to_obj(ref) : DRb.front
end
self.new_with(DRb.uri, [:DRbObject, uri, ref])
end
def _dump(lv)
if DRb.uri == @uri
if Array === @ref && @ref[0] == :DRbObject
Marshal.dump([@ref[1], @ref[2]])
else
Marshal.dump([@uri, @ref]) # ??
end
else
Marshal.dump([DRb.uri, [:DRbObject, @uri, @ref]])
end
end
end
end
=begin
DRb.install_id_conv(DRb::GWIdConv.new)
front = DRb::GW.new
s1 = DRb::DRbServer.new('drbunix:/tmp/gw_b_a', front)
s2 = DRb::DRbServer.new('drbunix:/tmp/gw_b_c', front)
s1.thread.join
s2.thread.join
=end
=begin
# foo.rb
require 'drb/drb'
class Foo
include DRbUndumped
def initialize(name, peer=nil)
@name = name
@peer = peer
end
def ping(obj)
puts "#{@name}: ping: #{obj.inspect}"
@peer.ping(self) if @peer
end
end
=end
=begin
# gw_a.rb
require 'drb/unix'
require 'foo'
obj = Foo.new('a')
DRb.start_service("drbunix:/tmp/gw_a", obj)
robj = DRbObject.new_with_uri('drbunix:/tmp/gw_b_a')
robj[:a] = obj
DRb.thread.join
=end
=begin
# gw_c.rb
require 'drb/unix'
require 'foo'
foo = Foo.new('c', nil)
DRb.start_service("drbunix:/tmp/gw_c", nil)
robj = DRbObject.new_with_uri("drbunix:/tmp/gw_b_c")
puts "c->b"
a = robj[:a]
sleep 2
a.ping(foo)
DRb.thread.join
=end