Added queue abstraction to Orchestra.
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@ -29,8 +29,9 @@ module ActiveSupport
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# and is available at ActiveSupport::Orchestra::Listener.
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#
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module Orchestra
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mattr_accessor :queue
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@stacked_events = Hash.new { |h,k| h[k] = [] }
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@listeners = []
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def self.instrument(name, payload=nil)
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stack = @stacked_events[Thread.current.object_id]
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@ -41,15 +42,11 @@ def self.instrument(name, payload=nil)
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ensure
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event.finish!
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stack.delete(event)
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@listeners.each { |s| s.push(event) }
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queue.push(event)
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end
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def self.register(listener)
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@listeners << listener
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end
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def self.unregister(listener)
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@listeners.delete(listener)
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def self.subscribe(pattern=nil, &block)
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queue.subscribe(pattern, &block)
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end
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class Event
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@ -69,35 +66,47 @@ def finish!
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end
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end
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class Listener
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attr_reader :mutex, :signaler, :thread
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# This is a default queue implementation that ships with Orchestra. It
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# consumes events in a thread and publish them to all registered subscribers.
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#
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class LittleFanout
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def initialize
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@mutex, @signaler = Mutex.new, ConditionVariable.new
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@stream = []
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@listeners, @stream = [], []
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@thread = Thread.new do
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loop do
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(event = @stream.shift) ? consume(event) : wait
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(event = @stream.shift) ? consume(event) : Thread.stop
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end
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end
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end
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def wait
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@mutex.synchronize do
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@signaler.wait(@mutex)
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end
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def push(event)
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@stream.push(event)
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@thread.run
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end
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def push(event)
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@mutex.synchronize do
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@stream.push(event)
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@signaler.broadcast
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end
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def subscribe(pattern=nil, &block)
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@listeners << Listener.new(pattern, &block)
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end
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def consume(event)
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raise NotImplementedError
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@listeners.each { |l| l.publish(event) }
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end
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class Listener
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def initialize(pattern, &block)
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@pattern = pattern
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@subscriber = block
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end
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def publish(event)
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unless @pattern && event.name.to_s !~ @pattern
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@subscriber.call(event)
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end
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end
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end
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end
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end
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Orchestra.queue = Orchestra::LittleFanout.new
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end
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@ -1,5 +1,12 @@
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require 'abstract_unit'
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# Allow LittleFanout to be cleaned.
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class ActiveSupport::Orchestra::LittleFanout
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def clear
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@listeners.clear
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end
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end
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class OrchestraEventTest < Test::Unit::TestCase
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def setup
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@parent = ActiveSupport::Orchestra::Event.new(:parent)
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@ -34,12 +41,12 @@ def test_duration_is_set_when_event_finishes
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class OrchestraMainTest < Test::Unit::TestCase
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def setup
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@listener = []
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ActiveSupport::Orchestra.register @listener
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@events = []
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ActiveSupport::Orchestra.subscribe { |event| @events << event }
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end
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def teardown
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ActiveSupport::Orchestra.unregister @listener
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ActiveSupport::Orchestra.queue.clear
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end
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def test_orchestra_allows_any_action_to_be_instrumented
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@ -65,9 +72,9 @@ def test_events_are_published_to_a_listener
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1 + 1
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end
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assert_equal 1, @listener.size
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assert_equal :awesome, @listener.last.name
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assert_equal "orchestra", @listener.last.payload
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assert_equal 1, @events.size
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assert_equal :awesome, @events.last.name
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assert_equal "orchestra", @events.last.payload
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end
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def test_nested_events_can_be_instrumented
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@ -76,18 +83,18 @@ def test_nested_events_can_be_instrumented
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sleep(0.1)
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end
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assert_equal 1, @listener.size
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assert_equal :wot, @listener.first.name
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assert_equal "child", @listener.first.payload
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assert_equal 1, @events.size
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assert_equal :wot, @events.first.name
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assert_equal "child", @events.first.payload
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assert_nil @listener.first.parent.duration
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assert_in_delta 100, @listener.first.duration, 30
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assert_nil @events.first.parent.duration
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assert_in_delta 100, @events.first.duration, 30
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end
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assert_equal 2, @listener.size
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assert_equal :awesome, @listener.last.name
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assert_equal "orchestra", @listener.last.payload
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assert_in_delta 100, @listener.first.parent.duration, 30
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assert_equal 2, @events.size
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assert_equal :awesome, @events.last.name
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assert_equal "orchestra", @events.last.payload
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assert_in_delta 100, @events.first.parent.duration, 30
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end
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def test_event_is_pushed_even_if_block_fails
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@ -95,67 +102,43 @@ def test_event_is_pushed_even_if_block_fails
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raise "OMG"
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end rescue RuntimeError
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assert_equal 1, @listener.size
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assert_equal :awesome, @listener.last.name
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assert_equal "orchestra", @listener.last.payload
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end
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end
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class OrchestraListenerTest < Test::Unit::TestCase
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class MyListener < ActiveSupport::Orchestra::Listener
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attr_reader :consumed
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def consume(event)
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@consumed ||= []
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@consumed << event
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end
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assert_equal 1, @events.size
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assert_equal :awesome, @events.last.name
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assert_equal "orchestra", @events.last.payload
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end
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def setup
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@listener = MyListener.new
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ActiveSupport::Orchestra.register @listener
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end
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def test_subscriber_with_pattern
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@another = []
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ActiveSupport::Orchestra.subscribe(/cache/) { |event| @another << event }
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def teardown
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ActiveSupport::Orchestra.unregister @listener
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end
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ActiveSupport::Orchestra.instrument(:something){ 0 }
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ActiveSupport::Orchestra.instrument(:cache){ 10 }
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def test_thread_is_exposed_by_listener
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assert_kind_of Thread, @listener.thread
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end
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def test_event_is_consumed_when_an_action_is_instrumented
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ActiveSupport::Orchestra.instrument(:sum) do
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1 + 1
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end
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sleep 0.1
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assert_equal 1, @listener.consumed.size
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assert_equal :sum, @listener.consumed.first.name
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assert_equal 2, @listener.consumed.first.result
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assert_equal 1, @another.size
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assert_equal :cache, @another.first.name
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assert_equal 10, @another.first.result
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end
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def test_with_sevaral_consumers_and_several_events
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@another = MyListener.new
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ActiveSupport::Orchestra.register @another
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def test_with_several_consumers_and_several_events
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@another = []
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ActiveSupport::Orchestra.subscribe { |event| @another << event }
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1.upto(100) do |i|
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ActiveSupport::Orchestra.instrument(:value) do
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i
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end
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ActiveSupport::Orchestra.instrument(:value){ i }
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end
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sleep 0.1
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assert_equal 100, @listener.consumed.size
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assert_equal :value, @listener.consumed.first.name
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assert_equal 1, @listener.consumed.first.result
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assert_equal 100, @listener.consumed.last.result
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assert_equal 100, @events.size
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assert_equal :value, @events.first.name
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assert_equal 1, @events.first.result
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assert_equal 100, @events.last.result
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assert_equal 100, @another.consumed.size
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assert_equal :value, @another.consumed.first.name
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assert_equal 1, @another.consumed.first.result
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assert_equal 100, @another.consumed.last.result
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ensure
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ActiveSupport::Orchestra.unregister @another
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assert_equal 100, @another.size
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assert_equal :value, @another.first.name
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assert_equal 1, @another.first.result
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assert_equal 100, @another.last.result
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end
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end
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