def batch_write_spans(
        self,
        name,
        spans,
        retry=google.api_core.gapic_v1.method.DEFAULT,
        timeout=google.api_core.gapic_v1.method.DEFAULT,
        metadata=None,
    ):
        """
        Sends new spans to new or existing traces. You cannot update
        existing spans.

        Example:
            >>> from google.cloud import trace_v2
            >>>
            >>> client = trace_v2.TraceServiceClient()
            >>>
            >>> name = client.project_path('[PROJECT]')
            >>>
            >>> # TODO: Initialize `spans`:
            >>> spans = []
            >>>
            >>> client.batch_write_spans(name, spans)

        Args:
            name (str): Required. The name of the project where the spans belong. The format is
                ``projects/[PROJECT_ID]``.
            spans (list[Union[dict, ~google.cloud.trace_v2.types.Span]]): A list of new spans. The span names must not match existing
                spans, or the results are undefined.

                If a dict is provided, it must be of the same form as the protobuf
                message :class:`~google.cloud.trace_v2.types.Span`
            retry (Optional[google.api_core.retry.Retry]):  A retry object used
                to retry requests. If ``None`` is specified, requests will not
                be retried.
            timeout (Optional[float]): The amount of time, in seconds, to wait
                for the request to complete. Note that if ``retry`` is
                specified, the timeout applies to each individual attempt.
            metadata (Optional[Sequence[Tuple[str, str]]]): Additional metadata
                that is provided to the method.

        Raises:
            google.api_core.exceptions.GoogleAPICallError: If the request
                    failed for any reason.
            google.api_core.exceptions.RetryError: If the request failed due
                    to a retryable error and retry attempts failed.
            ValueError: If the parameters are invalid.
        """
        # Wrap the transport method to add retry and timeout logic.
        if "batch_write_spans" not in self._inner_api_calls:
            self._inner_api_calls[
                "batch_write_spans"
            ] = google.api_core.gapic_v1.method.wrap_method(
                self.transport.batch_write_spans,
                default_retry=self._method_configs["BatchWriteSpans"].retry,
                default_timeout=self._method_configs["BatchWriteSpans"].timeout,
                client_info=self._client_info,
            )

        request = tracing_pb2.BatchWriteSpansRequest(name=name, spans=spans)
        if metadata is None:
            metadata = []
        metadata = list(metadata)
        try:
            routing_header = [("name", name)]
        except AttributeError:
            pass
        else:
            routing_metadata = google.api_core.gapic_v1.routing_header.to_grpc_metadata(
                routing_header
            )
            metadata.append(routing_metadata)

        self._inner_api_calls["batch_write_spans"](
            request, retry=retry, timeout=timeout, metadata=metadata
        )
Sends new spans to new or existing traces. You cannot update
        existing spans.

        Example:
            >>> from google.cloud import trace_v2
            >>>
            >>> client = trace_v2.TraceServiceClient()
            >>>
            >>> name = client.project_path('[PROJECT]')
            >>>
            >>> # TODO: Initialize `spans`:
            >>> spans = []
            >>>
            >>> client.batch_write_spans(name, spans)

        Args:
            name (str): Required. The name of the project where the spans belong. The format is
                ``projects/[PROJECT_ID]``.
            spans (list[Union[dict, ~google.cloud.trace_v2.types.Span]]): A list of new spans. The span names must not match existing
                spans, or the results are undefined.

                If a dict is provided, it must be of the same form as the protobuf
                message :class:`~google.cloud.trace_v2.types.Span`
            retry (Optional[google.api_core.retry.Retry]):  A retry object used
                to retry requests. If ``None`` is specified, requests will not
                be retried.
            timeout (Optional[float]): The amount of time, in seconds, to wait
                for the request to complete. Note that if ``retry`` is
                specified, the timeout applies to each individual attempt.
            metadata (Optional[Sequence[Tuple[str, str]]]): Additional metadata
                that is provided to the method.

        Raises:
            google.api_core.exceptions.GoogleAPICallError: If the request
                    failed for any reason.
            google.api_core.exceptions.RetryError: If the request failed due
                    to a retryable error and retry attempts failed.
            ValueError: If the parameters are invalid.