Dynamic Management of CORBA Trader Federation
Djamel Belaid, Nicolas Provenzano,
and Chantal Taconet,
Institut National Des Telecommunications
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
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