Tobi Lehman tlehman

Pub/Sub pattern with PostgreSQL's LISTEN/NOTIFY command

This is a simple chat-like program using pub-sub pattern, backed by PostgreSQL's LISTEN/NOTIFY command.

publish message to foo channel from user nickname.

$ python pub.py foo nickname
PUBLISH to channel #foo

	# http://www.evanmiller.org/bayesian-ab-testing.html implemented in ruby
	# requires the distribution gem from https://github.com/clbustos/distribution (gem 'distribution', require: false)

	def probability_b_beats_a(completed_a, total_a, completed_b, total_b)
	require 'distribution/math_extension'
	total = 0.0

	alpha_a = completed_a + 1
	beta_a = total_a - completed_a + 1
	alpha_b = completed_b + 1

	graph = {}
	ObjectSpace.each_object(Class) do \|klass\|
	sup = klass.superclass and graph[klass] = sup
	end

	puts "digraph{overlap=false;"
	graph.map do \|key, value\|
	puts %("#{key}"\n"#{key}"->"#{value}")
	end
	puts"}"