Quality of Service - Aspects of Distributed Programs

Modelling and implementing distributed systems leads often to the same problems. By ignoring partial failures, dynamic changes in bandwiths, security issues etc. object-orientation provides a very well suited abstraction. But when actually dealing with the aspects arising from the distribution, former clear designs loose their elegance. Little or none support is provided by current implementations. Quality of Service (QoS) handling provides mechanisms to integrate the handling of distribution aspects separated from the service implementation. We will motivate QoS as aspects of distributed programs. By extending OMG IDL we provide QoS integration in object-oriented middleware in a generic manner such that the service itself is little aaected.