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
|
# encoding: utf-8
$LOAD_PATH.unshift File.expand_path("../../../../lib", __FILE__)
require "amqp"
require "yaml"
t = Thread.new { EventMachine.run }
sleep(0.5)
connection = AMQP.connect
channel = AMQP::Channel.new(connection, :auto_recovery => true)
channel.prefetch(1)
# Acknowledgements are good for letting the server know
# that the task is finished. If the consumer doesn't send
# the acknowledgement, then the task is considered to be unfinished
# and will be requeued when consumer closes AMQP connection (because of a crash, for example).
channel.queue("amqpgem.examples.patterns.command", :durable => true, :auto_delete => false).subscribe(:ack => true) do |metadata, payload|
case metadata.type
when "gems.install"
data = YAML.load(payload)
puts "[gems.install] Received a 'gems.install' request with #{data.inspect}"
# just to demonstrate a realistic example
shellout = "gem install #{data[:gem]} --version '#{data[:version]}'"
puts "[gems.install] Executing #{shellout}"; system(shellout)
puts
puts "[gems.install] Done"
puts
else
puts "[commands] Unknown command: #{metadata.type}"
end
# message is processed, acknowledge it so that broker discards it
metadata.ack
end
puts "[boot] Ready"
Signal.trap("INT") { connection.close { EventMachine.stop } }
t.join
|
