summaryrefslogtreecommitdiff
path: root/jni/ruby/lib/drb/gw.rb
blob: b3568ab08d6e261cad79c6f8d08c88e4d5f8a88b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
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