Added possibility to process messages for each consumer group independently

[dario-l]

This addition do not change anything to default behavior of CAP.

To run processing messages for each consumer group independently must set option UseDispatchingPerGroup to true. This will add to DI container DispatcherPerGroup instead of default Dispatcher.

With default Dispatcher behavior of CAP is:

As you can see VeryFastProcessingReceiver waits until XSlowProcessingReceiver finishes.

With DispatcherPerGroup behavior of CAP is:

Here we have situation where all subscribers pushes received messages to own dispatching channel. Each channel has set thread count to ConsumerThreadCount value.

New feature is used in new sample application Sample.RabbitMQ.SqlServer.DispatcherPerGroup.

[yang-xiaodong]

LGTM , Thanks

[dario-l]

Great, thanks 😃 👍🏻