def emit(self, span_datas):
        """
        :type span_datas: list of :class:
            `~opencensus.trace.span_data.SpanData`
        :param span_datas:
            SpanData tuples to emit
        """
        jaeger_spans = self.translate_to_jaeger(span_datas)

        batch = jaeger.Batch(
            spans=jaeger_spans,
            process=jaeger.Process(serviceName=self.service_name))

        if self.collector is not None:
            self.collector.export(batch)
        self.agent_client.export(batch)
:type span_datas: list of :class:
            `~opencensus.trace.span_data.SpanData`
        :param span_datas:
            SpanData tuples to emit