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I can act as a man in the middle between any Producer and Consumer.
@ivar producer: the Producer I subscribe to.
@type producer: L{IProducer<interfaces.IProducer>}
@ivar consumer: the Consumer I publish to.
@type consumer: L{IConsumer<interfaces.IConsumer>}
@ivar paused: As a Producer, am I paused?
@type paused: bool
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