GlueQoS: another DIPAL

[Anne Anderson <Anne.Anderson@sun.com>]

Colleagues,

I just ran into another DIPAL integrated with WS-Policy.  It is called
"GlueQoS" and is described in the following paper:

E. Wolstadter, S. Tai, T. Mikalsen, I. Rouvellou, P. Devanbu, "GlueQoS:
Middleware to Sweeten Quality-of-Service Policy Interactions", in Proc.
of ICSE 2004 (May 2005, Edinburgh, Scotland, UK), IEEE, pp. 189-199.

It has a policy intersection algorithm.  Complicating the picture,
however, is that GlueQoS Assertions can have XML attributes representing
"features", which are end-to-end QoS requirements, where a "feature
engineer" must identify the effect of each possible combination of
features.  Effects of combining two features are expressed as positive
(acts to satisfy some non-functional requirement), negative (prevents
other components from satisfying functional or non-functional
requirements), and 0 (there is no observable change).

The types of effects are:
  Orthogonal: combining features A and B results in the individual
effect of A plus the individual effect of B
  Complements: The combined effect of features A and B is greater than
the effect of A plus the effect of B.
  Dependent: feature A is dependent on feature B if the effect of
combining A and B is greater than 0, but the effect of A alone is <= 0.
  Conflicts: feature A conflicts with feature B if their combined effect
is < 0.
  Prevents: feature A prevents feature B if the effect of their
combination is equivalent to the effect of A.
  Equivalent: feature A and feature B are equivalent if the effect of
one is equal to the effect of the other, and the effect of combining
them is equivalent to the effect of either.

They support integer, string, and floating point attribute types.

That's as much analysis as I can do right now, but others may want to
take a look and summarize to the list.

Regards,
Anne
-- 
Anne H. Anderson             Email: Anne.Anderson@Sun.COM
Sun Microsystems Laboratories
1 Network Drive,UBUR02-311     Tel: 781/442-0928
Burlington, MA 01803-0902 USA  Fax: 781/442-1692