Additional comments for #290

[dzeber]

@alberginia Is there a reason for keeping the Queue managed outside of the SyntheticDataStreamer? I feel like this is an implementation detail that should be encapsulated inside the streamer class. The queue could be a member variable of the SyntheticDataStreamer class, set up automatically when the streamer instance is created. Then SyntheticDataStreamer could have a get() method which gets an item from the queue. The streamer instance would then be passed to the ContinuousCopy class rather than the queue. What do you think?