Object replacement using dynamic proxy updates

In a distribbted environment, a client program bound to a sewer fails when the Sewer changes (possibly due to the sewer being relocated, replicated or rewnfigured). In this paper, we describe the design of an object-replacement scheme in a client-sewer environment. Our design addresses the problem of replacing a sewer and transparently updating the client handle so that no sewice interruption is experienced by the client. The programming environment, on which this work is based, provides passive shared objects, threads, and invocations as the building blocks for distributed applications. Our design takes into account the potential concurrency within clients and sewers. Our task was relatively simplified by building the replacement mechanisms on top of an asynchronous event notification facility that handles events on a per-application basis, as opposed to a per-task or per-thread basis.