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<!-- NeL Network Library : Features -->
<table width=100%><tr><td align=left><b>NeL Network Library : Features</b></td><td align=right><b></b></td></TR></TABLE>
<H2>Introduction</H2>
<P>The first objective of NeL's network library (NeL Net) is to provide a complete OS-independent data transfer API that abstracts system specific code and provides mechanisms for complete control of bandwidth usage by the application code.</P>
<P>NeL Net has a further objective of providing a complete toolkit, comprising further layers of library code and core service implementations, for the development of performance critical distributed program systems for massively multi user universe servers. </P>
<H2>Features</H2>
<H3>General Features</H3>
<UL>
<li>A layer based architecture with API access to every layer
<LI>Client application API
<LI>Encapsulation of process of connection to Shard Front End
<LI>Encapsulation of buffering and data transmission to Shard Front End
<LI>Encapsulation of reception and decoding of messages within data packets received from shard
<LI>Current implementation is based on TCP/IP
</UL>
<H3>Shard Back End application ('service') Framework and API</H3>
<UL>
<LI>Framework for developing new services
<LI>Abstraction of inter-service connections with disconnection and reconnection management
<LI>Management of transmission of messages to other services (with buffering)
<LI>Management of reception and treatment of messages from other services (with buffering)
<LI>Management of time synchronisation
<LI>Management of log messages with consolidation and filtering tools
<LI>Centralised shard administration and management
<LI>Current implementation is based on TCP/IP
</UL>
<H3>Shard Front End application API</H3>
<UL>
<LI>All features pertaining to back end services
<LI>Multi-threaded client-communication management for large numbers of client connections
<LI>Separation of incoming messages from the shard back end and incoming messages from clients
<LI>Login authentication
<LI>Mechanisms for monitoring growth of output data packets to the application program
<LI>Current implementation is based on TCP/IP
</UL>
<H3>Login/ logout management</H3>
<UL>
<LI>Automated system fo registration of shards with Login Manager
<LI>API for connection of client application to Login Manager, for login and password authentication and for valid shard list retrieval by the client.
<LI>API for selection of a shard (for an authenticated user), selection of least loaded front end server on the shard for client connection and secure system for establishing the client connection.
</UL>
<H3>On the fly backup management (to be developped)</H3>
<UL>
<LI>Management of a backup schedules and shard backup synchronisation
<LI>Standalone service dedicated to reception and secure storage of backup data (with concept of transactions and data coherency)
<LI>Service API for backing up data
</UL>
<H3>Future Spec enhancements (to be developped)</H3>
<UL>
<LI>Multi-threaded application support
<LI>Add a UDP channel from Client to Shard front end
<LI>Investigate ways of adding a UDP channel from shard to client (looks tricky)
<LI>Add support for data compression
<LI>Optimisation of communication between services running on the same server (via pipes and/ or shared memory)
</UL>
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