def _configure_io_handler(self, handler):
        """Register an io-handler at the polling object."""
        if self.check_events():
            return
        if handler in self._unprepared_handlers:
            old_fileno = self._unprepared_handlers[handler]
            prepared = self._prepare_io_handler(handler)
        else:
            old_fileno = None
            prepared = True
        fileno = handler.fileno()
        if old_fileno is not None and fileno != old_fileno:
            del self._handlers[old_fileno]
            # remove_handler won't raise something like KeyError if the fd
            # isn't registered; it will just print a debug log.
            self.io_loop.remove_handler(old_fileno)
        if not prepared:
            self._unprepared_handlers[handler] = fileno
        if not fileno:
            return
        update = fileno in self._handlers
        events = ioloop.IOLoop.NONE
        if handler.is_readable():
            logger.debug(" {0!r} readable".format(handler))
            events |= ioloop.IOLoop.READ
        if handler.is_writable():
            logger.debug(" {0!r} writable".format(handler))
            events |= ioloop.IOLoop.WRITE

        if self._handlers.get(fileno, None) == events:
            return
        self._handlers[fileno] = events
        if events:
            logger.debug(" registering {0!r} handler fileno {1} for"
                            " events {2}".format(handler, fileno, events))
            if update:
                self.io_loop.update_handler(fileno, events)
            else:
                self.io_loop.add_handler(
                    fileno, partial(self._handle_event, handler), events
                )
def _configure_io_handler(self, handler):
        """Register an io-handler at the polling object."""
        if self.check_events():
            return
        if handler in self._unprepared_handlers:
            old_fileno = self._unprepared_handlers[handler]
            prepared = self._prepare_io_handler(handler)
        else:
            old_fileno = None
            prepared = True
        fileno = handler.fileno()
        if old_fileno is not None and fileno != old_fileno:
            del self._handlers[old_fileno]
            # remove_handler won't raise something like KeyError if the fd
            # isn't registered; it will just print a debug log.
            self.io_loop.remove_handler(old_fileno)
        if not prepared:
            self._unprepared_handlers[handler] = fileno
        if not fileno:
            return
        update = fileno in self._handlers
        events = ioloop.IOLoop.NONE
        if handler.is_readable():
            logger.debug(" {0!r} readable".format(handler))
            events |= ioloop.IOLoop.READ
        if handler.is_writable():
            logger.debug(" {0!r} writable".format(handler))
            events |= ioloop.IOLoop.WRITE

        if self._handlers.get(fileno, None) == events:
            return
        self._handlers[fileno] = events
        if events:
            logger.debug(" registering {0!r} handler fileno {1} for"
                            " events {2}".format(handler, fileno, events))
            if update:
                self.io_loop.update_handler(fileno, events)
            else:
                self.io_loop.add_handler(
                    fileno, partial(self._handle_event, handler), events
                )
def _configure_io_handler ( self , handler ) : if self . check_events ( ) : return if handler in self . _unprepared_handlers : old_fileno = self . _unprepared_handlers [ handler ] prepared = self . _prepare_io_handler ( handler ) else : old_fileno = None prepared = True fileno = handler . fileno ( ) if old_fileno is not None and fileno != old_fileno : del self . _handlers [ old_fileno ] # remove_handler won't raise something like KeyError if the fd # isn't registered; it will just print a debug log. self . io_loop . remove_handler ( old_fileno ) if not prepared : self . _unprepared_handlers [ handler ] = fileno if not fileno : return update = fileno in self . _handlers events = ioloop . IOLoop . NONE if handler . is_readable ( ) : logger . debug ( " {0!r} readable" . format ( handler ) ) events |= ioloop . IOLoop . READ if handler . is_writable ( ) : logger . debug ( " {0!r} writable" . format ( handler ) ) events |= ioloop . IOLoop . WRITE if self . _handlers . get ( fileno , None ) == events : return self . _handlers [ fileno ] = events if events : logger . debug ( " registering {0!r} handler fileno {1} for" " events {2}" . format ( handler , fileno , events ) ) if update : self . io_loop . update_handler ( fileno , events ) else : self . io_loop . add_handler ( fileno , partial ( self . _handle_event , handler ) , events )
Register an io-handler at the polling object.
Register an io - handler at the polling object .