This is a default queue implementation that ships with Notifications. It just pushes events to all registered log subscribers.
This class is thread safe. All methods are reentrant.
# File lib/active_support/notifications/fanout.rb, line 13 def initialize @subscribers = [] @listeners_for = ThreadSafe::Cache.new super end
# File lib/active_support/notifications/fanout.rb, line 39 def finish(name, id, payload) listeners_for(name).each { |s| s.finish(name, id, payload) } end
# File lib/active_support/notifications/fanout.rb, line 47 def listeners_for(name) # this is correctly done double-checked locking (ThreadSafe::Cache's lookups have volatile semantics) @listeners_for[name] || synchronize do # use synchronisation when accessing @subscribers @listeners_for[name] ||= @subscribers.select { |s| s.subscribed_to?(name) } end end
# File lib/active_support/notifications/fanout.rb, line 55 def listening?(name) listeners_for(name).any? end
# File lib/active_support/notifications/fanout.rb, line 43 def publish(name, *args) listeners_for(name).each { |s| s.publish(name, *args) } end
# File lib/active_support/notifications/fanout.rb, line 35 def start(name, id, payload) listeners_for(name).each { |s| s.start(name, id, payload) } end
# File lib/active_support/notifications/fanout.rb, line 19 def subscribe(pattern = nil, block = Proc.new) subscriber = Subscribers.new pattern, block synchronize do @subscribers << subscriber @listeners_for.clear end subscriber end
# File lib/active_support/notifications/fanout.rb, line 28 def unsubscribe(subscriber) synchronize do @subscribers.reject! { |s| s.matches?(subscriber) } @listeners_for.clear end end
This is a sync queue, so there is no waiting.
# File lib/active_support/notifications/fanout.rb, line 60 def wait end