public interface EventLoopGroup
NioEventLoopGroup that relies on selectors. But also different
 implementations can be added like spinning, thread per connection, epoll based etc.
 todo:
 - packet/client-message reader and metricsNioEventLoopGroup| Modifier and Type | Method and Description | 
|---|---|
| void | register(Channel channel)Registers a channel at this  EventLoopGroup. | 
| void | shutdown()Shuts down this EventLoopGroup. | 
| void | start()Starts this EventLoopGroup. | 
void register(Channel channel)
EventLoopGroup.
 Every Channel should be registered at at most 1 EventLoopGroup and it is very unlikely that during the lifespan of the
 Channel, it will change its EventLoopGroup.channel - the channel to register.void start()
void shutdown()
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