Created
October 16, 2015 02:56
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require 'benchmark' | |
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 = {} | |
@mutex = Mutex.new | |
end | |
def subscribe(pattern = nil, block = Proc.new) | |
subscriber = Subscriber.new(pattern, block) | |
@mutex.synchronize do | |
@subscribers << subscriber | |
@listeners_for.clear | |
end | |
subscriber | |
end | |
def unsubscribe(subscriber) | |
@mutex.synchronize do | |
@subscribers.reject! {|s| s.matches?(subscriber)} | |
@listeners_for.clear | |
end | |
end | |
def publish(name, *args) | |
listeners_for(name).each { |s| s.publish(name, *args) } | |
end | |
def listeners_for(name) | |
@mutex.synchronize do | |
@listeners_for[name] ||= @subscribers.select { |s| s.subscribed_to?(name) } | |
end | |
end | |
def listening?(name) | |
listeners_for(name).any? | |
end | |
# This is a sync queue, so there is no waiting. | |
def wait | |
end | |
class Subscriber #:nodoc: | |
def initialize(pattern, delegate) | |
@pattern = pattern | |
@delegate = delegate | |
end | |
def publish(message, *args) | |
@delegate.call(message, *args) | |
end | |
def subscribed_to?(name) | |
!@pattern || @pattern === name.to_s | |
end | |
def matches?(subscriber_or_name) | |
self === subscriber_or_name || | |
@pattern && @pattern === subscriber_or_name | |
end | |
end | |
end | |
end | |
end | |
puts Benchmark.measure { | |
fan = ActiveSupport::Notifications::Fanout.new | |
sub = [] | |
pub = [] | |
100_000.times do | |
sub << Thread.new do | |
s = fan.subscribe('foo') do | |
#noop | |
end | |
fan.unsubscribe(s) | |
end | |
pub << Thread.new do | |
fan.publish('foo', 'bar') | |
end | |
end | |
sub.each(&:join) | |
pub.each(&:join) | |
} |
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