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Contents
module Hyrax
module Callbacks
class Registry
attr_reader :callbacks
def initialize
@callbacks = {}
end
# Enables a callback by specifying one or more hooks.
def enable(hook, *more_hooks)
([hook] + more_hooks).each { |h| @callbacks[h] ||= nil }
end
# Returns all enabled callback hooks.
def enabled
@callbacks.keys
end
# Returns true if the callback hook has been enabled.
def enabled?(hook)
@callbacks.key? hook
end
# Defines a callback for a given hook.
def set(hook, &block)
raise NoBlockGiven, "a block is required when setting a callback" unless block_given?
@callbacks[hook] = proc(&block)
end
# Returns true if a callback has been defined for a given hook.
def set?(hook)
enabled?(hook) && @callbacks[hook].respond_to?(:call)
end
# Runs the callback defined for a given hook, with the arguments provided
def run(hook, *args)
raise NotEnabled unless enabled?(hook)
return nil unless set?(hook)
@callbacks[hook].call(*args)
end
end
# Custom exceptions
class NotEnabled < StandardError; end
class NoBlockGiven < StandardError; end
end
end
Version data entries
58 entries across 58 versions & 2 rubygems