Migrating stateful web services using Apache Axis and P2P

Common web service architectures follow the classical client-server model with the client bound to the web service by a static physical connection. In this paper we show that this model is too restricted for some business scenarios and motivate the paradigm and the advantages of migratable web services. Migratable web services are instances of conventional web services that can change their executing host without loosing the actual state and the connection to their clients. Migratable web services exceed remote installation of code. We present an Apache Axis based architecture which allows the seamless migration of arbitrary web service instances between hosts. The connection to the clients is not affected by migration processes as the physical client-server model is abstracted to a logical client server model. A JXTA based P2P grid is used by an infrequently requesting client to discover its personal instance of a web service after multiple unnoticed migrations.

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