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module Gitlab
module Ci
class Trace
module ChunkedFile
module Concerns
module Hooks
extend ActiveSupport::Concern
included do
class_attribute :_before_methods, :_after_methods,
:instance_writer => false
self._before_methods = Hash.new []
self._after_methods = Hash.new []
end
class_methods do
def before_method(kind, callback)
self._before_methods = self._before_methods.
merge kind => _before_methods[kind] + [callback]
end
def after_method(kind, callback)
self._after_methods = self._after_methods.
merge kind => _after_methods[kind] + [callback]
end
end
def method_added(method_name)
return if self.class._before_methods.values.include?(method_name)
return if self.class._after_methods.values.include?(method_name)
return if hooked_methods.include?(method_name)
add_hooks_to(method_name)
end
private
def hooked_methods
@hooked_methods ||= []
end
def add_hooks_to(method_name)
hooked_methods << method_name
original_method = instance_method(method_name)
# re-define the method, but notice how we reference the original
# method definition
define_method(method_name) do |*args, &block|
self.class._before_methods[method_name].each { |hook| method(hook).call }
# now invoke the original method
original_method.bind(self).call(*args, &block).tap do
self.class._after_methods[method_name].each { |hook| method(hook).call }
end
end
end
end
end
end
end
end
end
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