Ensure we registerProducer isn't called twice
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@ -69,6 +69,9 @@ class BackgroundFileConsumer(object):
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streaming (bool): True if push based producer, False if pull
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based.
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"""
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if self.producer:
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raise Exception("registerProducer called twice")
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self.producer = producer
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self.streaming = streaming
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self.finished_deferred = threads.deferToThread(self._writer)
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