Class: EventMachine::EvmaUDPSocket

Inherits:
DatagramObject show all
Defined in:
lib/pr_eventmachine.rb

Instance Attribute Summary

Attributes inherited from Selectable

#io, #uuid

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from DatagramObject

#initialize, #select_for_reading?, #select_for_writing?, #send_datagram

Methods inherited from Selectable

#close_scheduled?, #get_peername, #initialize, #select_for_reading?, #select_for_writing?

Constructor Details

This class inherits a constructor from EventMachine::DatagramObject

Class Method Details

.create(host, port) ⇒ Object 



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# File 'lib/pr_eventmachine.rb', line 639

def create host, port
  sd = Socket.new( Socket::AF_INET, Socket::SOCK_DGRAM, 0 )
  sd.bind Socket::pack_sockaddr_in( port, host )
  EvmaUDPSocket.new sd
end

Instance Method Details

#eventable_read ⇒ Object

Proper nonblocking I/O was added to Ruby 1.8.4 in May 2006. If we have it, then we can read multiple times safely to improve performance.



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# File 'lib/pr_eventmachine.rb', line 673

def eventable_read
  begin
    if io.respond_to?(:recvfrom_nonblock)
      40.times {
        data,@return_address = io.recvfrom_nonblock(16384)
        EventMachine::event_callback uuid, ConnectionData, data
        @return_address = nil
      }
    else
      raise "unimplemented datagram-read operation on this Ruby"
    end
  rescue Errno::EAGAIN
    # no-op
  rescue Errno::ECONNRESET, EOFError
    @close_scheduled = true
    EventMachine::event_callback uuid, ConnectionUnbound, nil
  end

end

#eventable_write ⇒ Object

#eventable_write This really belongs in DatagramObject, but there is some UDP-specific stuff.



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# File 'lib/pr_eventmachine.rb', line 648

def eventable_write
  40.times {
    break if @outbound_q.empty?
    begin
      data,target = @outbound_q.first

      # This damn better be nonblocking.
      io.send data.to_s, 0, target

      @outbound_q.shift
    rescue Errno::EAGAIN
      # It's not been observed in testing that we ever get here.
      # True to the definition, packets will be accepted and quietly dropped
      # if the system is under pressure.
      break
    rescue EOFError, Errno::ECONNRESET
      @close_scheduled = true
      @outbound_q.clear
    end
  }
end

#send_data(data) ⇒ Object 



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# File 'lib/pr_eventmachine.rb', line 694

def send_data data
  send_datagram data, @return_address
end