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What are the key concepts in netty from a learning perspective?
I have been given the task to implement a streaming server using netty. I have used jboss-netty before but never used netty itself. What I need to do is setup an instance of server which is listening on a network address. The client then sends data to the server and the server must then store it in a list for later retrieval. The server should also be able to log the events to a file. This may mean some performance testing to see how fast the server is. 
What are the key concepts in netty that I should be aware of?
A:
I recommend first, you start reading their docs:
The documentation and samples should be enough to get you started.
Netty has lots of samples:
Some of those examples will have an explanation of how it works.
The important concept is the EventLoop.  This is the main thread that handles events, processing them, dispatching them, and anything else that has to do with the "core" of the program.  It is the EventLoop that makes Netty different from other frameworks.  It is much more reliable and will be less likely to deadlock than other approaches (like thread pools).
The other key concept is Channel.  This is an abstraction of a socket/connection.  You can create a channel and have Netty start listening on that channel.  In that case, when a client connects, Netty will dispatch the onConnect(ChannelHandlerContext) event to the handler you registered on that channel.
Once you have a handler, you can just go on to do what you want with the data the channel passes along.  For instance, you might read some information from it, process it, etc.  
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