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| The network server for kafka. Now application specific code here, just general network server stuff. |
| <br> |
| The classes Receive and Send encapsulate the incoming and outgoing transmission of bytes. A Handler |
| is a mapping between a Receive and a Send, and represents the users hook to add logic for mapping requests |
| to actual processing code. Any uncaught exceptions in the reading or writing of the transmissions will result in |
| the server logging an error and closing the offending socket. As a result it is the duty of the Handler |
| implementation to catch and serialize any application-level errors that should be sent to the client. |
| <br> |
| This slightly lower-level interface that models sending and receiving rather than requests and responses |
| is necessary in order to allow the send or receive to be overridden with a non-user-space writing of bytes |
| using FileChannel.transferTo. |
