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# -*- frozen-string-literal: true -*-
module Plum
module EventEmitter
# Registers an event handler to specified event. An event can have multiple handlers.
# @param name [Symbol] The name of event.
# @yield Gives event-specific parameters.
def on(name, &blk)
(callbacks[name] ||= []) << blk
end
# Invokes an event and call handlers with args.
# @param name [Symbol] The identifier of event.
def callback(name, *args)
(cbs = callbacks[name]) && cbs.each {|cb| cb.call(*args) }
end
private
def callbacks
@callbacks ||= {}
end
end
end
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