How to use the pynetdicom.dsutils.decode function in pynetdicom

------
        AttributeError
            If the corresponding event is not due to one of the DIMSE requests
            with a dataset-like parameter.
        """
        try:
            bytestream = getattr(self.request, attr)
            # If no change in encoded data then return stored decode
            if self._hash == hash(bytestream):
                return self._decoded

            # Some dataset-like parameters are optional
            if bytestream and bytestream.getvalue() != b'':
                # Dataset-like parameter has been used
                t_syntax = self.context.transfer_syntax
                ds = decode(bytestream,
                            t_syntax.is_implicit_VR,
                            t_syntax.is_little_endian)

                ds.is_little_endian = t_syntax.is_little_endian
                ds.is_implicit_VR = t_syntax.is_implicit_VR

                # Store the decoded dataset in case its accessed again
                self._decoded = ds
            else:
                # Dataset-like parameter hasn't been used
                self._decoded = Dataset()

            self._hash = hash(bytestream)
            return self._decoded

        except AttributeError:

----------
        req : dimse_primitives.C_FIND
            The C-FIND request primitive received from the peer.
        context : presentation.PresentationContext
            The presentation context that the SCP is operating under.
        """
        # Build C-FIND response primitive
        rsp = C_FIND()
        rsp.MessageID = req.MessageID
        rsp.MessageIDBeingRespondedTo = req.MessageID
        rsp.AffectedSOPClassUID = req.AffectedSOPClassUID

        # Decode and log Identifier
        transfer_syntax = context.transfer_syntax[0]
        try:
            identifier = decode(req.Identifier,
                                transfer_syntax.is_implicit_VR,
                                transfer_syntax.is_little_endian)
            LOGGER.info('Find SCP Request Identifiers:')
            LOGGER.info('')
            LOGGER.debug('# DICOM Dataset')
            for elem in identifier.iterall():
                LOGGER.info(elem)
            LOGGER.info('')
        except Exception as ex:
            LOGGER.error("Failed to decode the request's Identifier dataset.")
            LOGGER.exception(ex)
            # Failure - Unable to Process - Failed to decode Identifier
            rsp.Status = 0xC310
            rsp.ErrorComment = 'Unable to decode the dataset'
            self.dimse.send_msg(rsp, context.context_id)
            return

----------
        req : dimse_primitives.C_MOVE
            The C-MOVE request primitive sent by the peer.
        context : presentation.PresentationContext
            The presentation context that the SCP is operating under.
        """
        # Build C-MOVE response primitive
        rsp = C_MOVE()
        rsp.MessageID = req.MessageID
        rsp.MessageIDBeingRespondedTo = req.MessageID
        rsp.AffectedSOPClassUID = req.AffectedSOPClassUID

        # Attempt to decode the request's Identifier dataset
        transfer_syntax = context.transfer_syntax[0]
        try:
            identifier = decode(req.Identifier,
                                transfer_syntax.is_implicit_VR,
                                transfer_syntax.is_little_endian)
            LOGGER.info('Move SCP Request Identifier:')
            LOGGER.info('')
            LOGGER.debug('# DICOM Data Set')
            for elem in identifier.iterall():
                LOGGER.info(elem)
            LOGGER.info('')
        except Exception as exc:
            LOGGER.error("Failed to decode the request's Identifier dataset")
            LOGGER.exception(exc)
            # Failure: Cannot Understand - Dataset decoding error
            rsp.Status = 0xC510
            rsp.ErrorComment = 'Unable to decode the dataset'
            self.dimse.send_msg(rsp, context.context_id)
            return

* DICOM Standard, Part 4, :dcm:`Annex II`
        * DICOM Standard, Part 7, Sections
          :dcm:`9.1.2`,
          :dcm:`9.3.2` and
          :dcm:`Annex C`
        """
        # Build C-FIND response primitive
        rsp = C_FIND()
        rsp.MessageID = req.MessageID
        rsp.MessageIDBeingRespondedTo = req.MessageID
        rsp.AffectedSOPClassUID = req.AffectedSOPClassUID

        # Decode and log Identifier
        transfer_syntax = context.transfer_syntax[0]
        try:
            identifier = decode(req.Identifier,
                                transfer_syntax.is_implicit_VR,
                                transfer_syntax.is_little_endian)
            LOGGER.info('Find SCP Request Identifiers:')
            LOGGER.info('')
            LOGGER.debug('# DICOM Dataset')
            for elem in identifier.iterall():
                LOGGER.info(elem)
            LOGGER.info('')
        except Exception as ex:
            LOGGER.error("Failed to decode the request's Identifier dataset.")
            LOGGER.exception(ex)
            # Failure - Unable to Process - Failed to decode Identifier
            rsp.Status = 0xC310
            rsp.ErrorComment = 'Unable to decode the dataset'
            self.dimse.send_msg(rsp, context.context_id)
            return