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#!/usr/bin/env ruby
# encoding: utf-8
require "rubygems"
require "bunny"
STDOUT.sync = true
puts "=> Subscribing for messages using explicit acknowledgements model"
puts
connection1 = Bunny.new
connection1.start
connection2 = Bunny.new
connection2.start
connection3 = Bunny.new
connection3.start
ch1 = connection1.create_channel
ch1.prefetch(1)
ch2 = connection2.create_channel
ch2.prefetch(1)
ch3 = connection3.create_channel
ch3.prefetch(1)
x = ch3.direct("amq.direct")
q1 = ch1.queue("bunny.examples.acknowledgements.explicit", :auto_delete => false)
q1.purge
q1.bind(x).subscribe(:manual_ack => true, :block => false) do |delivery_info, properties, payload|
# do some work
sleep(0.2)
# acknowledge some messages, they will be removed from the queue
if rand > 0.5
# FYI: there is a shortcut, Bunny::Channel.ack
ch1.acknowledge(delivery_info.delivery_tag, false)
puts "[consumer1] Got message ##{properties.headers['i']}, redelivered?: #{delivery_info.redelivered?}, ack-ed"
else
# some messages are not ack-ed and will remain in the queue for redelivery
# when app #1 connection is closed (either properly or due to a crash)
puts "[consumer1] Got message ##{properties.headers['i']}, SKIPPED"
end
end
q2 = ch2.queue("bunny.examples.acknowledgements.explicit", :auto_delete => false)
q2.bind(x).subscribe(:manual_ack => true, :block => false) do |delivery_info, properties, payload|
# do some work
sleep(0.2)
ch2.acknowledge(delivery_info.delivery_tag, false)
puts "[consumer2] Got message ##{properties.headers['i']}, redelivered?: #{delivery_info.redelivered?}, ack-ed"
end
t1 = Thread.new do
i = 0
loop do
sleep 0.5
x.publish("Message ##{i}", :headers => { :i => i })
i += 1
end
end
t1.abort_on_exception = true
t2 = Thread.new do
sleep 4.0
connection1.close
puts "----- Connection 1 is now closed (we pretend that it has crashed) -----"
end
t2.abort_on_exception = true
sleep 7.0
connection2.close
connection3.close
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