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module ActiveSupport
module Notifications
# This is a default queue implementation that ships with Notifications. It
# just pushes events to all registered log subscribers.
class Fanout
def initialize
@subscribers = []
@listeners_for = {}
end
def bind(pattern)
Binding.new(self, pattern)
end
def subscribe(pattern = nil, &block)
@listeners_for.clear
@subscribers << Subscriber.new(pattern, &block)
@subscribers.last
end
def unsubscribe(subscriber)
@listeners_for.clear
@subscribers.reject! {|s| s.matches?(subscriber)}
end
def publish(name, *args)
if listeners = @listeners_for[name]
listeners.each { |s| s.publish(name, *args) }
else
@listeners_for[name] = @subscribers.select { |s| s.publish(name, *args) }
end
end
# This is a sync queue, so there is not waiting.
def wait
end
# Used for internal implementation only.
class Binding #:nodoc:
def initialize(queue, pattern)
@queue = queue
@pattern =
case pattern
when Regexp, NilClass
pattern
else
/^#{Regexp.escape(pattern.to_s)}$/
end
end
def subscribe(&block)
@queue.subscribe(@pattern, &block)
end
end
class Subscriber #:nodoc:
def initialize(pattern, &block)
@pattern = pattern
@block = block
end
def publish(*args)
return unless subscribed_to?(args.first)
push(*args)
true
end
def drained?
true
end
def subscribed_to?(name)
!@pattern || @pattern =~ name.to_s
end
def matches?(subscriber_or_name)
case subscriber_or_name
when String
@pattern && @pattern =~ subscriber_or_name
when self
true
end
end
private
def push(*args)
@block.call(*args)
end
end
end
end
end
|
