How to use the ipyparallel.util function in ipyparallel

that the result failed and later receive the actual result.
        """

        outstanding = self.queues[eid]

        for msg_id in outstanding:
            self.pending.remove(msg_id)
            self.all_completed.add(msg_id)
            try:
                raise error.EngineError("Engine %r died while running task %r" % (eid, msg_id))
            except:
                content = error.wrap_exception()
            # build a fake header:
            header = {}
            header['engine'] = uuid
            header['date'] = util.utcnow()
            rec = dict(result_content=content, result_header=header, result_buffers=[])
            rec['completed'] = util.ensure_timezone(header['date'])
            rec['engine_uuid'] = uuid
            try:
                self.db.update_record(msg_id, rec)
            except Exception:
                self.log.error("DB Error handling stranded msg %r", msg_id, exc_info=True)

    @util.log_errors
    @coroutine
    def dispatch_query(self, msg):
        """Route registration requests and queries from clients."""
        try:
            idents, msg = self.session.feed_identities(msg)
        except ValueError:
            idents = []
        if not idents:
            self.log.error("Bad Query Message: %r", msg)
            return
        client_id = idents[0]
        try:
            msg = self.session.deserialize(msg, content=True)
        except Exception:
            content = error.wrap_exception()
            self.log.error("Bad Query Message: %r", msg, exc_info=True)

else:
        # in a process, don't use instance()
        # for safety with multiprocessing
        ctx = zmq.Context()
        loop = ioloop.IOLoop()
    ins = ZMQStream(ctx.socket(zmq.ROUTER),loop)
    util.set_hwm(ins, 0)
    ins.setsockopt(zmq.IDENTITY, identity + b'_in')
    ins.bind(in_addr)

    outs = ZMQStream(ctx.socket(zmq.ROUTER),loop)
    util.set_hwm(outs, 0)
    outs.setsockopt(zmq.IDENTITY, identity + b'_out')
    outs.bind(out_addr)
    mons = zmqstream.ZMQStream(ctx.socket(zmq.PUB),loop)
    util.set_hwm(mons, 0)
    mons.connect(mon_addr)
    nots = zmqstream.ZMQStream(ctx.socket(zmq.SUB),loop)
    nots.setsockopt(zmq.SUBSCRIBE, b'')
    nots.connect(not_addr)

    querys = ZMQStream(ctx.socket(zmq.DEALER),loop)
    querys.connect(reg_addr)

    # setup logging.
    if in_thread:
        log = Application.instance().log
    else:
        if log_url:
            log = connect_logger(logname, ctx, log_url, root="scheduler", loglevel=loglevel)
        else:
            log = local_logger(logname, loglevel)

----------

        ns : dict
            dict of keys with which to update engine namespace(s)
        block : bool [default : self.block]
            whether to wait to be notified of engine receipt

        """

        block = block if block is not None else self.block
        track = track if track is not None else self.track
        targets = targets if targets is not None else self.targets
        # applier = self.apply_sync if block else self.apply_async
        if not isinstance(ns, dict):
            raise TypeError("Must be a dict, not %s"%type(ns))
        return self._really_apply(util._push, kwargs=ns, block=block, track=track, targets=targets)

content = msg['content']
        md = {'msg_id' : parent['msg_id'],
              'received' : util.utcnow(),
              'engine_uuid' : msg_meta.get('engine', None),
              'follow' : msg_meta.get('follow', []),
              'after' : msg_meta.get('after', []),
              'status' : content['status'],
            }

        if md['engine_uuid'] is not None:
            md['engine_id'] = self._engines.get(md['engine_uuid'], None)

        if 'date' in parent:
            md['submitted'] = parent['date']
        if 'started' in msg_meta:
            md['started'] = util._parse_date(msg_meta['started'])
        if 'date' in header:
            md['completed'] = header['date']
        return md

    @util.log_errors
    def dispatch_notification(self, msg):
        """dispatch register/unregister events."""
        try:
            idents,msg = self.session.feed_identities(msg)
        except ValueError:
            self.log.warn("task::Invalid Message: %r",msg)
            return
        try:
            msg = self.session.deserialize(msg)
        except ValueError:
            self.log.warn("task::Unauthorized message from: %r"%idents)
            return

        msg_type = msg['header']['msg_type']

        handler = self._notification_handlers.get(msg_type, None)

        @util.interactive
        def remote_import(name, fromlist, level):
            """the function to be passed to apply, that actually performs the import
            on the engine, and loads up the user namespace.
            """
            import sys
            user_ns = globals()
            mod = __import__(name, fromlist=fromlist, level=level)
            if fromlist:
                for key in fromlist:
                    user_ns[key] = getattr(mod, key)
            else:
                user_ns[name] = sys.modules[name]

"""get object(s) by `name` from remote namespace

        will return one object if it is a key.
        can also take a list of keys, in which case it will return a list of objects.
        """
        block = block if block is not None else self.block
        targets = targets if targets is not None else self.targets
        if isinstance(names, string_types):
            pass
        elif isinstance(names, (list,tuple,set)):
            for key in names:
                if not isinstance(key, string_types):
                    raise TypeError("keys must be str, not type %r"%type(key))
        else:
            raise TypeError("names must be strs, not %r"%names)
        return self._really_apply(util._pull, (names,), block=block, targets=targets)