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# frozen_string_literal: true
# Released under the MIT License.
# Copyright, 2023, by Samuel Williams.
require 'fiber'
class Fiber
# A mechanism for annotating fibers.
module Annotation
# Annotate the current fiber with the given annotation.
# @parameter annotation [Object] The annotation to set.
def initialize(annotation: nil, **options, &block)
@annotation = annotation
super(**options, &block)
end
# Get the current annotation.
# @returns [Object] The current annotation.
attr_accessor :annotation
# Annotate the current fiber with the given annotation.
#
# If a block is given, the annotation is set for the duration of the block and then restored to the previous value.
#
# The block form of this method should only be invoked on the current fiber.
#
# @parameter annotation [Object] The annotation to set.
# @yields {} The block to execute with the given annotation.
# @returns [Object] The return value of the block.
def annotate(annotation)
if block_given?
raise "Cannot annotation a different fiber!" unless Fiber.current == self
begin
current_annotation = @annotation
@annotation = annotation
return yield
ensure
@annotation = current_annotation
end
else
@annotation = annotation
end
end
end
end
unless Fiber.method_defined?(:annotation)
Fiber.prepend(Fiber::Annotation)
# @scope Fiber
# @name self.annotate
# Annotate the current fiber with the given annotation.
def Fiber.annotate(...)
Fiber.current.annotate(...)
end
end
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