Class: IOPromise::ExecutorContext

Inherits:
Object
  • Object
show all
Defined in:
lib/iopromise/executor_context.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ ExecutorContext

Returns a new instance of ExecutorContext.



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# File 'lib/iopromise/executor_context.rb', line 14

def initialize
  @pools = {}

  @pending_registrations = []

  @selector = NIO::Selector.new

  super
end

Class Method Details

.current ⇒ Object 



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# File 'lib/iopromise/executor_context.rb', line 9

def current
  @context ||= ExecutorContext.new
end

Instance Method Details

#register(promise) ⇒ Object 



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# File 'lib/iopromise/executor_context.rb', line 30

def register(promise)
  @pending_registrations << promise
  IOPromise::CancelContext.current&.subscribe(promise)
end

#register_observer_io(observer, io, interest) ⇒ Object 



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# File 'lib/iopromise/executor_context.rb', line 24

def register_observer_io(observer, io, interest)
  monitor = @selector.register(io, interest)
  monitor.value = observer
  monitor
end

#wait_for_all_data(end_when_complete: nil) ⇒ Object 



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# File 'lib/iopromise/executor_context.rb', line 35

def wait_for_all_data(end_when_complete: nil)
  unless end_when_complete.nil?
    raise IOPromise::CancelledError if end_when_complete.cancelled?
  end

  loop do
    complete_pending_registrations

    @pools.each do |pool, _|
      pool.execute_continue
    end
    
    unless end_when_complete.nil?
      return unless end_when_complete.pending?
    end
    
    break if @selector.empty?

    # if we have any pending promises to register, we'll not block at all so we immediately continue
    unless @pending_registrations.empty?
      wait_time = 0
    else
      wait_time = nil
      @pools.each do |pool, _|
        timeout = pool.select_timeout
        wait_time = timeout if wait_time.nil? || (!timeout.nil? && timeout < wait_time)
      end
    end
    
    ready_count = select(wait_time)
  end

  unless end_when_complete.nil?
    raise ::IOPromise::Error.new('Internal error: IO loop completed without fulfilling the desired promise')
  else
    @pools.each do |pool, _|
      pool.wait
    end
  end
ensure
  complete_pending_registrations
end