Created
October 5, 2011 08:20
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Demonstrate queue unsubscribe bug
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require 'bundler' | |
Bundler.setup | |
require 'amqp' | |
puts "single-message consumer listening to rapid producer" | |
QUEUE_NAME = 'test.rapid-queue-unsubscription' | |
PRODUCE_RATE = 1.0/10 | |
CONSUME_RATE = 1.0/9 | |
def start_producer | |
exchange = AMQP::Exchange.new(AMQP::Channel.new, :direct, "") | |
n = 0 | |
EM::PeriodicTimer.new(PRODUCE_RATE) do | |
message = "msg #{n}" | |
exchange.publish(message, | |
:immediate => true, # IMPORTANT, messages are dropped if nobody listening now | |
:routing_key => QUEUE_NAME) | |
puts "> PUT #{message}" | |
n += 1 | |
end | |
end | |
def start_consumer | |
EM::PeriodicTimer.new(CONSUME_RATE) do | |
started = Time.now | |
AMQP::Channel.new do |channel_consumer| | |
channel_consumer.prefetch(1) | |
tick_queue = channel_consumer.queue(QUEUE_NAME) | |
consumer = AMQP::Consumer.new(channel_consumer, tick_queue, nil, exclusive = false, no_ack = true) | |
consumer.on_delivery do |_, message| | |
took = Time.now - started | |
puts "< GET #{message} [waited #{took.round(2)}s][#{(1.0/took).round(2)} reqs/sec]" | |
consumer.cancel | |
channel_consumer.close | |
end | |
consumer.consume | |
end | |
end | |
end | |
EM.run do | |
EM.set_quantum(50) | |
start_producer | |
start_consumer | |
end |
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> PUT msg 0 | |
< GET msg 0 [waited 0.0s][511.25 reqs/sec] | |
> PUT msg 1 | |
> PUT msg 2 | |
< GET msg 1 [waited 0.0s][439.56 reqs/sec] | |
/Users/rud/.rvm/gems/ruby-1.9.2-head@bundler/gems/amq-client-0.8.3/lib/amq/client/async/consumer.rb:246:in `block in <class:Consumer>': undefined method `handle_delivery' for nil:NilClass (NoMethodError) | |
from /Users/rud/.rvm/gems/ruby-1.9.2-head@bundler/gems/amq-client-0.8.3/lib/amq/client/async/adapter.rb:535:in `call' | |
from /Users/rud/.rvm/gems/ruby-1.9.2-head@bundler/gems/amq-client-0.8.3/lib/amq/client/async/adapter.rb:535:in `receive_frameset' | |
from /Users/rud/.rvm/gems/ruby-1.9.2-head@bundler/gems/amq-client-0.8.3/lib/amq/client/async/adapter.rb:514:in `receive_frame' | |
from /Users/rud/.rvm/gems/ruby-1.9.2-head@bundler/gems/amq-client-0.8.3/lib/amq/client/async/adapters/event_machine.rb:326:in `receive_data' | |
from /Users/rud/.rvm/gems/ruby-1.9.2-head@bundler/gems/eventmachine-0.12.10/lib/eventmachine.rb:256:in `run_machine' | |
from /Users/rud/.rvm/gems/ruby-1.9.2-head@bundler/gems/eventmachine-0.12.10/lib/eventmachine.rb:256:in `run' | |
from demo-amqp-one-message-subscribers.rb:57:in `<main>' |
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/Users/rud/.rvm/gems/ruby-1.9.2-head@bundler/gems/amq-client-0.8.3/lib/amq/client/async/adapter.rb:244:in `send_frame': Trying to send frame through a closed connection. Frame is #<AMQ::Protocol::MethodFrame:0x007fa6d29a35f0 @payload="\x00<\x00(\x00\x00\x00\x1Ftest.rapid-queue-unsubscription\x02", @channel=1> (AMQ::Client::ConnectionClosedError) | |
from /Users/rud/.rvm/gems/ruby-1.9.2-head@bundler/gems/amq-client-0.8.3/lib/amq/client/async/adapter.rb:261:in `block (2 levels) in send_frameset' | |
from /Users/rud/.rvm/gems/ruby-1.9.2-head@bundler/gems/amq-client-0.8.3/lib/amq/client/async/adapter.rb:261:in `each' | |
from /Users/rud/.rvm/gems/ruby-1.9.2-head@bundler/gems/amq-client-0.8.3/lib/amq/client/async/adapter.rb:261:in `block in send_frameset' | |
from <internal:prelude>:10:in `synchronize' | |
from /Users/rud/.rvm/gems/ruby-1.9.2-head@bundler/gems/amq-client-0.8.3/lib/amq/client/async/channel.rb:100:in `synchronize' | |
from /Users/rud/.rvm/gems/ruby-1.9.2-head@bundler/gems/amq-client-0.8.3/lib/amq/client/async/adapter.rb:260:in `send_frameset' | |
from /Users/rud/.rvm/gems/ruby-1.9.2-head@bundler/gems/amq-client-0.8.3/lib/amq/client/async/exchange.rb:152:in `publish' | |
from /Users/rud/.rvm/gems/ruby-1.9.2-head@bundler/gems/amqp-0.8.0/lib/amqp/exchange.rb:482:in `block in publish' | |
from /Users/rud/.rvm/gems/ruby-1.9.2-head@bundler/gems/eventmachine-0.12.10/lib/em/deferrable.rb:47:in `call' | |
from /Users/rud/.rvm/gems/ruby-1.9.2-head@bundler/gems/eventmachine-0.12.10/lib/em/deferrable.rb:47:in `callback' | |
from /Users/rud/.rvm/gems/ruby-1.9.2-head@bundler/gems/amqp-0.8.0/lib/amqp/channel.rb:905:in `once_open' | |
from /Users/rud/.rvm/gems/ruby-1.9.2-head@bundler/gems/amqp-0.8.0/lib/amqp/exchange.rb:479:in `publish' | |
from demo-amqp-one-message-subscribers.rb:16:in `block in start_producer' | |
from /Users/rud/.rvm/gems/ruby-1.9.2-head@bundler/gems/eventmachine-0.12.10/lib/em/timers.rb:51:in `call' | |
from /Users/rud/.rvm/gems/ruby-1.9.2-head@bundler/gems/eventmachine-0.12.10/lib/em/timers.rb:51:in `fire' | |
from /Users/rud/.rvm/gems/ruby-1.9.2-head@bundler/gems/eventmachine-0.12.10/lib/eventmachine.rb:256:in `call' | |
from /Users/rud/.rvm/gems/ruby-1.9.2-head@bundler/gems/eventmachine-0.12.10/lib/eventmachine.rb:256:in `run_machine' | |
from /Users/rud/.rvm/gems/ruby-1.9.2-head@bundler/gems/eventmachine-0.12.10/lib/eventmachine.rb:256:in `run' | |
from demo-amqp-one-message-subscribers.rb:45:in `<main>' |
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source 'http://rubygems.org' | |
gem 'amqp' | |
gem 'eventmachine' |
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GEM | |
remote: http://rubygems.org/ | |
specs: | |
amq-client (0.8.3) | |
amq-protocol (>= 0.8.0) | |
eventmachine | |
amq-protocol (0.8.1) | |
amqp (0.8.0) | |
amq-client (~> 0.8.3) | |
amq-protocol (~> 0.8.0) | |
eventmachine | |
eventmachine (0.12.10) | |
PLATFORMS | |
ruby | |
DEPENDENCIES | |
amqp | |
eventmachine |
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OS X 10.7.1 | |
ruby 1.9.2p312 (2011-08-11 revision 32926) [x86_64-darwin11.1.0] | |
RabbitMQ 2.6.1 |
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