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header --> + + +<!-- 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> + + +<!-- footer --> +<BR><FONT Size=+5> </FONT> +</TD> +<TD WIDTH=15><IMG SRC=/inc/img/pixel.gif WIDTH=15 HEIGHT=15 BORDER=0 ALT=""></TD> +</TR> +</TABLE> + +</BODY> +</HTML>
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