82 lines
2.3 KiB
Ruby
82 lines
2.3 KiB
Ruby
require 'active_support/core_ext/module/delegation'
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module ActiveSupport
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# Notifications provides an instrumentation API for Ruby. To instrument an
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# action in Ruby you just need to do:
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#
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# ActiveSupport::Notifications.instrument(:render, :extra => :information) do
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# render :text => "Foo"
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# end
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#
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# You can consume those events and the information they provide by registering
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# a log subscriber. For instance, let's store all instrumented events in an array:
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#
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# @events = []
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#
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# ActiveSupport::Notifications.subscribe do |*args|
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# @events << ActiveSupport::Notifications::Event.new(*args)
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# end
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#
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# ActiveSupport::Notifications.instrument(:render, :extra => :information) do
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# render :text => "Foo"
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# end
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#
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# event = @events.first
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# event.name #=> :render
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# event.duration #=> 10 (in miliseconds)
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# event.result #=> "Foo"
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# event.payload #=> { :extra => :information }
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#
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# When subscribing to Notifications, you can pass a pattern, to only consume
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# events that match the pattern:
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#
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# ActiveSupport::Notifications.subscribe(/render/) do |event|
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# @render_events << event
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# end
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#
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# Notifications ships with a queue implementation that consumes and publish events
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# to log subscribers in a thread. You can use any queue implementation you want.
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#
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module Notifications
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autoload :Instrumenter, 'active_support/notifications/instrumenter'
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autoload :Event, 'active_support/notifications/instrumenter'
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autoload :Fanout, 'active_support/notifications/fanout'
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class << self
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attr_writer :notifier
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delegate :publish, :subscribe, :unsubscribe, :to => :notifier
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delegate :instrument, :to => :instrumenter
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def notifier
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@notifier ||= Notifier.new
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end
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def instrumenter
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Thread.current[:"instrumentation_#{notifier.object_id}"] ||= Instrumenter.new(notifier)
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end
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end
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class Notifier
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def initialize(queue = Fanout.new)
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@queue = queue
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end
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def publish(*args)
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@queue.publish(*args)
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end
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def subscribe(pattern = nil, &block)
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@queue.bind(pattern).subscribe(&block)
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end
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def unsubscribe(subscriber)
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@queue.unsubscribe(subscriber)
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end
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def wait
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@queue.wait
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end
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end
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end
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end
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