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|
require 'thread'
module ActiveSupport
module Notifications
# This is a default queue implementation that ships with Notifications. It
# consumes events in a thread and publish them to all registered subscribers.
#
class Fanout
def initialize
@subscribers = []
end
def bind(pattern)
Binding.new(self, pattern)
end
def subscribe(pattern = nil, &block)
@subscribers << Subscriber.new(pattern, &block)
end
def publish(*args)
@subscribers.each { |s| s.publish(*args) }
end
def wait
sleep(0.05) until @subscribers.all?(&:drained?)
end
# Used for internal implementation only.
class Binding #:nodoc:
def initialize(queue, pattern)
@queue, @pattern = queue, pattern
end
def subscribe(&block)
@queue.subscribe(@pattern, &block)
end
end
# Used for internal implementation only.
class Subscriber #:nodoc:
def initialize(pattern, &block)
@pattern =
case pattern
when Regexp, NilClass
pattern
else
/^#{Regexp.escape(pattern.to_s)}/
end
@block = block
@events = Queue.new
start_consumer
end
def publish(name, *args)
push(name, args) if matches?(name)
end
def consume
while args = @events.shift
@block.call(*args)
end
end
def drained?
@events.size.zero?
end
private
def start_consumer
Thread.new { consume }
end
def matches?(name)
!@pattern || @pattern =~ name.to_s
end
def push(name, args)
@events << args.unshift(name)
end
end
end
end
end
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