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
161
162
163
164
|
#
# Note: Rinda::Ring API is unstable.
#
require 'drb/drb'
require 'rinda/rinda'
require 'thread'
module Rinda
Ring_PORT = 7647
class RingServer
include DRbUndumped
def initialize(ts, port=Ring_PORT)
@ts = ts
@soc = UDPSocket.open
@soc.bind('', port)
@w_service = write_service
@r_service = reply_service
end
def write_service
Thread.new do
loop do
msg, addr = @soc.recvfrom(1024)
do_write(msg)
end
end
end
def do_write(msg)
Thread.new do
begin
tuple, sec = Marshal.load(msg)
@ts.write(tuple, sec)
rescue
end
end
end
def reply_service
Thread.new do
loop do
do_reply
end
end
end
def do_reply
tuple = @ts.take([:lookup_ring, DRbObject])
Thread.new { tuple[1].call(@ts) rescue nil}
rescue
end
end
class RingFinger
@@finger = nil
def self.finger
unless @@finger
@@finger = self.new
@@finger.lookup_ring_any
end
@@finger
end
def self.primary
finger.primary
end
def self.to_a
finger.to_a
end
@@broadcast_list = ['<broadcast>', 'localhost']
def initialize(broadcast_list=@@broadcast_list, port=Ring_PORT)
@broadcast_list = broadcast_list || ['localhost']
@port = port
@primary = nil
@rings = []
end
attr_accessor :broadcast_list, :port, :primary
def to_a
@rings
end
def each
lookup_ring_any unless @primary
return unless @primary
yield(@primary)
@rings.each { |x| yield(x) }
end
def lookup_ring(timeout=5, &block)
return lookup_ring_any(timeout) unless block_given?
msg = Marshal.dump([[:lookup_ring, DRbObject.new(block)], timeout])
@broadcast_list.each do |it|
soc = UDPSocket.open
begin
soc.setsockopt(Socket::SOL_SOCKET, Socket::SO_BROADCAST, true)
soc.send(msg, 0, it, @port)
rescue
nil
ensure
soc.close
end
end
sleep(timeout)
end
def lookup_ring_any(timeout=5)
queue = Queue.new
th = Thread.new do
self.lookup_ring(timeout) do |ts|
queue.push(ts)
end
queue.push(nil)
while it = queue.pop
@rings.push(it)
end
end
@primary = queue.pop
raise('RingNotFound') if @primary.nil?
@primary
end
end
class RingProvider
def initialize(klass, front, desc, renewer = nil)
@tuple = [:name, klass, front, desc]
@renewer = renewer || Rinda::SimpleRenewer.new
end
def provide
ts = Rinda::RingFinger.primary
ts.write(@tuple, @renewer)
end
end
end
if __FILE__ == $0
DRb.start_service
case ARGV.shift
when 's'
require 'rinda/tuplespace'
ts = Rinda::TupleSpace.new
place = Rinda::RingServer.new(ts)
$stdin.gets
when 'w'
finger = Rinda::RingFinger.new(nil)
finger.lookup_ring do |ts|
p ts
ts.write([:hello, :world])
end
when 'r'
finger = Rinda::RingFinger.new(nil)
finger.lookup_ring do |ts|
p ts
p ts.take([nil, nil])
end
end
end
|
