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COOTS
1998 Abstract
Dynamic Management of CORBA Trader Federation
Djamel Belaid, Nicolas Provenzano,
and Chantal Taconet,
Institut National Des Telecommunications
Abstract
In Wide Area Networks, tools for discovering objects
that provide a given service, and for choosing one out
of many are essential. The CORBA trading service is
one of these tools. A trader federation extends the
limit of a discovery, thanks to the cooperation of sev-eral
trading servers. However, in a federation, coop-eration
links are manually and statically established.
In this article, we propose an Extended Trading Serv-ice,
which manages a trader federation dynamically.
With Extended Trading Service, optimized links be-tween
traders are automatically set up thanks to the
use of a minimum-weight spanning tree. Cycles in
discovery propagation are eliminated. Links evolve
dynamically in order to adapt to the modification of
the underlying topology and the failure of an interme-diate
trader or link. The Extended Trading Service is
able to organize discovered objects from the nearest to
the furthest according to a distance function chosen for
the federation. Such management is provided by spe-cialized
trading servers conforming to OMG Trading
Service Specification.
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