Class: HTTPX::Selector

Inherits:
Object
  • Object
show all
Defined in:
lib/httpx/selector.rb

Defined Under Namespace

Classes: Monitor

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Selector

Returns a new instance of Selector.



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# File 'lib/httpx/selector.rb', line 50

def initialize
  @selectables = {}
  @__r__, @__w__ = IO.pipe
  @closed = false
end

Instance Method Details

#close ⇒ Object

Closes the selector.



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# File 'lib/httpx/selector.rb', line 121

def close
  return if @closed

  @__r__.close
  @__w__.close
rescue IOError
ensure
  @closed = true
end

#deregister(io) ⇒ Object

deregisters io from selectables.



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# File 'lib/httpx/selector.rb', line 57

def deregister(io)
  monitor = @selectables.delete(io)
  monitor.close(false) if monitor
end

#register(io, interests) ⇒ Object

register io for interests events.



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# File 'lib/httpx/selector.rb', line 63

def register(io, interests)
  monitor = @selectables[io]
  if monitor
    monitor.interests = interests
  else
    monitor = Monitor.new(io, interests, self)
    @selectables[io] = monitor
  end
  monitor
end

#select(interval) ⇒ Object

waits for read/write events for interval. Yields for monitors of selected IO objects.



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# File 'lib/httpx/selector.rb', line 77

def select(interval)
  begin
    r = [@__r__]
    w = []

    @selectables.each do |io, monitor|
      r << io if monitor.interests == :r || monitor.interests == :rw
      w << io if monitor.interests == :w || monitor.interests == :rw
      monitor.readiness = nil
    end

    readers, writers = IO.select(r, w, nil, interval)

    raise HTTPX::TimeoutError.new(interval, "timed out while waiting on select") if readers.nil? && writers.nil?
  rescue IOError, SystemCallError
    @selectables.reject! { |io, _| io.closed? }
    retry
  end

  readers.each do |io|
    if io == @__r__
      # clean up wakeups
      @__r__.read(@__r__.stat.size)
    else
      monitor = io.closed? ? @selectables.delete(io) : @selectables[io]
      next unless monitor

      monitor.readiness = writers.delete(io) ? :rw : :r
      yield monitor
    end
  end if readers

  writers.each do |io|
    monitor = io.closed? ? @selectables.delete(io) : @selectables[io]
    next unless monitor

    # don't double run this, the last iteration might have run this task already
    monitor.readiness = :w
    yield monitor
  end if writers
end

#wakeup ⇒ Object

interrupts the select call.



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# File 'lib/httpx/selector.rb', line 132

def wakeup
  @__w__.write_nonblock("\0", exception: false)
end