class EventMachine::StreamObject

@private

Public Class Methods

new(io) click to toggle source
Calls superclass method EventMachine::Selectable.new
# File lib/em/pure_ruby.rb, line 504
def initialize io
  super io
  @outbound_q = []
end

Public Instance Methods

eventable_read() click to toggle source

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. The last-activity clock ASSUMES that we only come here when we have selected readable. TODO, coalesce multiple reads into a single event. TODO, do the function check somewhere else and cache it.

# File lib/em/pure_ruby.rb, line 538
def eventable_read
  @last_activity = Reactor.instance.current_loop_time
  begin
    if io.respond_to?(:read_nonblock)
      10.times {
        data = io.read_nonblock(4096)
        EventMachine::event_callback uuid, ConnectionData, data
      }
    else
      data = io.sysread(4096)
      EventMachine::event_callback uuid, ConnectionData, data
    end
  rescue Errno::EAGAIN, Errno::EWOULDBLOCK
    # no-op
  rescue Errno::ECONNRESET, Errno::ECONNREFUSED, EOFError
    @close_scheduled = true
    EventMachine::event_callback uuid, ConnectionUnbound, nil
  end

end
eventable_write() click to toggle source

Provisional implementation. Will be re-implemented in subclasses. TODO: Complete this implementation. As it stands, this only writes a single packet per cycle. Highly inefficient, but required unless we're running on a Ruby with proper nonblocking I/O (Ruby 1.8.4 built from sources from May 25, 2006 or newer). We need to improve the loop so it writes multiple times, however not more than a certain number of bytes per cycle, otherwise one busy connection could hog output buffers and slow down other connections. Also we should coalesce small writes. URGENT TODO: Coalesce small writes. They are a performance killer. The last-activity recorder ASSUMES we'll only come here if we've selected writable.

# File lib/em/pure_ruby.rb, line 571
def eventable_write
  # coalesce the outbound array here, perhaps
  @last_activity = Reactor.instance.current_loop_time
  while data = @outbound_q.shift do
    begin
      data = data.to_s
      w = if io.respond_to?(:write_nonblock)
            io.write_nonblock data
          else
            io.syswrite data
          end

      if w < data.length
        @outbound_q.unshift data[w..-1]
        break
      end
    rescue Errno::EAGAIN
      @outbound_q.unshift data
    rescue EOFError, Errno::ECONNRESET, Errno::ECONNREFUSED
      @close_scheduled = true
      @outbound_q.clear
    end
  end

end
get_outbound_data_size() click to toggle source

#get_outbound_data_size

# File lib/em/pure_ruby.rb, line 624
def get_outbound_data_size
  @outbound_q.inject(0) {|memo,obj| memo += (obj || "").length}
end
get_peername() click to toggle source

get_peername This is defined in the normal way on connected stream objects. Return an object that is suitable for passing to Socket#unpack_sockaddr_in or variants. We could also use a convenience method that did the unpacking automatically.

# File lib/em/pure_ruby.rb, line 619
def get_peername
  io.getpeername
end
heartbeat() click to toggle source
# File lib/em/pure_ruby.rb, line 628
def heartbeat
  if @inactivity_timeout and @inactivity_timeout > 0 and (@last_activity + @inactivity_timeout) < Reactor.instance.current_loop_time
    schedule_close true
  end
end
schedule_close(after_writing) click to toggle source

schedule_close The application wants to close the connection.

# File lib/em/pure_ruby.rb, line 607
def schedule_close after_writing
  if after_writing
    @close_requested = true
  else
    @close_scheduled = true
  end
end
select_for_reading?() click to toggle source

If we have to close, or a close-after-writing has been requested, then don't read any more data.

# File lib/em/pure_ruby.rb, line 511
def select_for_reading?
  true unless (@close_scheduled || @close_requested)
end
select_for_writing?() click to toggle source

If we have to close, don't select for writing. Otherwise, see if the protocol is ready to close. If not, see if he has data to send. If a close-after-writing has been requested and the outbound queue is empty, convert the status to close_scheduled.

# File lib/em/pure_ruby.rb, line 520
def select_for_writing?
  unless @close_scheduled
    if @outbound_q.empty?
      @close_scheduled = true if @close_requested
      false
    else
      true
    end
  end
end
send_data(data) click to toggle source

#send_data

# File lib/em/pure_ruby.rb, line 598
def send_data data
  # TODO, coalesce here perhaps by being smarter about appending to @outbound_q.last?
  unless @close_scheduled or @close_requested or !data or data.length <= 0
    @outbound_q << data.to_s
  end
end