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Contents
require "aruba/event_bus/name_resolver"
require "aruba/errors"
module Aruba
# Event bus
#
# Implements and in-process pub-sub events broadcaster allowing multiple observers
# to subscribe to different events that fire as your tests are executed.
#
class EventBus
# Create EventBus
#
# @param [#transform] resolver
# A resolver which transforms Symbol, String, Class into an event Class.
def initialize(resolver)
@resolver = resolver
@handlers = Hash.new { |h, k| h[k] = [] }
end
# Register for an event
#
# @param [String, Symbol, Class, Array] event_ids
# If Array, register multiple events witht the same handler. If String,
# Symbol, Class register handler for given event.
#
# @param [#call] handler_object
# The handler object, needs to have method `#call`. Either
# `handler_object` or `block` can be defined. The handler object gets the
# event passed to `#call`.
#
# @yield
# Handler block which gets the event passed as parameter.
def register(event_ids, handler_object = nil, &handler_proc)
handler = handler_proc || handler_object
if handler.nil? || !handler.respond_to?(:call)
raise ArgumentError, "Please pass either an object#call or a handler block"
end
Array(event_ids).flatten.each do |id|
@handlers[
@resolver.transform(id).to_s
] << handler
end
nil
end
# Broadcast an event
#
# @param [Object] event
# An object of registered event class. This object is passed to the event
# handler.
#
def notify(event)
raise NoEventError, "Please pass an event object, not a class" if event.is_a?(Class)
@handlers[event.class.to_s].each { |handler| handler.call(event) }
end
end
end
Version data entries
10 entries across 10 versions & 3 rubygems