managed domains and unique event identifiers

[Homayoun Pourheidari <homayoun@bea.com>]

Hi,

Below is a porposed text to describe managed domains and the unique 
event identifier requirements for wsdm events. 

Cheers,
H.
--

A managed resource may go up and down many times during its life cycle.  
Every time that it is alive or up, it has an associated scope that 
includes all state and property values of the resource among other 
manageability information.  We call this scope the managed domain of a 
resource.

For all events associated with the scope of a resource, all 
notifications that describe the events and are created to report them, 
must have unique identifiers.  The identifiers are not required but may 
also be unique globally across the collective managed domains of all the 
resources that a manager is managing. 

When a resource is forced to restart its scope (e.g. goes down and comes 
back up) a new managed domain for that resource is also created.  WSDM 
does not require that notification ids produced in the latter managed 
domain to be unique across the current and the former managed domains of 
the resource.  However, more capable managers may provide ways to 
preserve some continuity of scope between various instantiations of a 
resource's managed domains as a way of providing a longer perspective on 
the life cycle of a  managed resource.  Unique identifiers for 
notifications across all of the managed domains of a managed resource 
may be one such candidate for continuity.




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