RE: [Xen-API] XenAPI, xapi toolstack, XendAPI, XL

[George Shuklin <george.shuklin@xxxxxxxxx>]

Thank you very much! It really helps.

I added this text to xen wiki:
http://wiki.xensource.com/xenwiki/API_History


Ð ÐÐÐ, 16/08/2010 Ð 17:52 +0100, Dave Scott ÐÐÑÐÑ:
> In the beginning was "xend" (the daemon) and "xm" (the CLI) both
> written in python, which communicated over an s-expression protocol.
> * Next there was a desire to improve the protocol and also to switch
> from s-expressions to something based on XMLRPC. The "XenAPI" is the
> name for this new protocol.
> * The "XenAPI" was implemented both in "xend" (python) and in
> "xapi" (ocaml) (although "xapi" wasn't open-source back then). Note
> that "xapi" doesn't share any code with "xend": it talks to xenstore,
> makes hypercalls etc directly.
> * The version of the "XenAPI" implemented by "xend" and "xapi" have
> diverged: for example "xapi" is more focused on managing pools of
> hosts while "xend" is more of a single host service.
> * The XCI (Xen Client Initiative) people also created a toolstack,
> called "xenvm" (ocaml)
> * Next there was a desire to share more code between all toolstacks,
> to prevent confusion and accidental reimplementation. The library with
> the common code is called "libxl"
> * Next there was a desire to create a "minimal" toolstack for testing
> "libxl": this is called "xl"
> 
> So:
> 
> Toolstacks: xend (python); xapi (ocaml); xenvm (ocaml); xl (C)
> Protocols: original xend s-expressions; XenAPI (XMLRPC)
> Libraries: libxl 


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