Class: Rage::FiberScheduler

Inherits:
Object
  • Object
show all
Defined in:
lib/rage/fiber_scheduler.rb

Instance Method Summary collapse

Constructor Details

#initialize ⇒ FiberScheduler

Returns a new instance of FiberScheduler.



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# File 'lib/rage/fiber_scheduler.rb', line 6

def initialize
  @root_fiber = Fiber.current
end

Instance Method Details

#address_resolve(hostname) ⇒ Object

result end



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# File 'lib/rage/fiber_scheduler.rb', line 74

def address_resolve(hostname)
  Resolv.getaddresses(hostname)
end

#block(blocker, timeout = nil) ⇒ Object 



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# File 'lib/rage/fiber_scheduler.rb', line 78

def block(blocker, timeout = nil)
  f = Fiber.current
  ::Iodine.subscribe("unblock:#{f.object_id}") do
    ::Iodine.defer { ::Iodine.unsubscribe("unblock:#{f.object_id}") }
    f.resume
  end
  # TODO support timeout
  Fiber.yield
end

#close ⇒ Object 



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# File 'lib/rage/fiber_scheduler.rb', line 107

def close
  ::Iodine::Scheduler.close
end

#fiber(&block) ⇒ Object 



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# File 'lib/rage/fiber_scheduler.rb', line 92

def fiber(&block)
  f = Fiber.current
  inner_schedule = f != @root_fiber

  fiber = Fiber.new(blocking: false) do
    Fiber.current.__set_result(block.call)
  ensure
    # send a message for `Fiber.await` to work
    Iodine.publish("await:#{f.object_id}", "") if inner_schedule
  end
  fiber.resume

  fiber
end

#io_read(io, buffer, length, offset = 0) ⇒ Object

TODO: this is more synchronous than asynchronous right now



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# File 'lib/rage/fiber_scheduler.rb', line 19

def io_read(io, buffer, length, offset = 0)
  loop do
    string = ::Iodine::Scheduler.read(io.fileno, length, offset)

    if string.nil?
      return offset
    end

    if string.empty?
      io_wait(io, IO::READABLE)
      next
    end

    buffer.set_string(string, offset)
    offset += string.bytesize

    size = string.bytesize
    break if size >= length
    length -= size
  end

  offset
end

#io_wait(io, events, timeout = nil) ⇒ Object 



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# File 'lib/rage/fiber_scheduler.rb', line 10

def io_wait(io, events, timeout = nil)
  f = Fiber.current
  ::Iodine::Scheduler.attach(io.fileno, events, timeout&.ceil || 0) { f.resume }
  Fiber.yield

  events
end

#io_write(io, buffer, length, offset = 0) ⇒ Object 



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# File 'lib/rage/fiber_scheduler.rb', line 43

def io_write(io, buffer, length, offset = 0)
  bytes_to_write = length
  bytes_to_write = buffer.size if length == 0

  ::Iodine::Scheduler.write(io.fileno, buffer.get_string, bytes_to_write, offset)

  buffer.size - offset
end

#kernel_sleep(duration = nil) ⇒ Object 



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# File 'lib/rage/fiber_scheduler.rb', line 52

def kernel_sleep(duration = nil)
  if duration
    f = Fiber.current
    ::Iodine.run_after((duration * 1000).to_i) { f.resume } 
    Fiber.yield
  end
end

#unblock(_blocker, fiber) ⇒ Object 



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# File 'lib/rage/fiber_scheduler.rb', line 88

def unblock(_blocker, fiber)
  ::Iodine.publish("unblock:#{fiber.object_id}", "")
end