Class: Affect::Fiber::Context

Inherits:
Object
  • Object
show all
Defined in:
lib/affect/fiber.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(handlers = nil, &block) ⇒ Context

Returns a new instance of Context.



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# File 'lib/affect/fiber.rb', line 66

def initialize(handlers = nil, &block)
  @handlers = handlers || { nil => block || -> { } }
end

Instance Attribute Details

#handlers ⇒ Object (readonly)

Returns the value of attribute handlers.



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# File 'lib/affect/fiber.rb', line 70

def handlers
  @handlers
end

Instance Method Details

#call_handler(handler, effect, *args) ⇒ Object 



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# File 'lib/affect/fiber.rb', line 93

def call_handler(handler, effect, *args)
  if handler.arity == 0
    handler.call
  elsif args.empty?
    handler.call(effect)
  else
    handler.call(*args)
  end
end

#capture(&block) ⇒ Object 



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# File 'lib/affect/fiber.rb', line 103

def capture(&block)
  Affect.capture(block, handler_proc)
end

#find_handler(effect) ⇒ Object 



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# File 'lib/affect/fiber.rb', line 89

def find_handler(effect)
  @handlers[effect] || @handlers[effect.class] || @handlers[nil]
end

#handle(effect, *args) ⇒ Object 



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# File 'lib/affect/fiber.rb', line 76

def handle(effect, *args)
  handler = find_handler(effect)
  if handler
    call_handler(handler, effect, *args)
  else
    begin
      Fiber.yield Intent.new(effect, *args)
    rescue FiberError
      raise RuntimeError, "No handler found for #{effect.inspect}"
    end
  end
end

#handler_proc ⇒ Object 



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# File 'lib/affect/fiber.rb', line 72

def handler_proc
  proc { |effect, *args| handle(effect, *args) }
end