Flexible and reconfigurable support for fault-tolerant object replication [Elektronische Ressource] / vorgelegt von Hans Peter Reiser

Flexible and Reconfigurable Supportfor Fault-Tolerant Object ReplicationDissertationzur Erlangung des Doktorgrades Dr. rer. nat.der Fakultät für Ingenieurwissenschaften und Informatikder Universität Ulmvorgelegt vonHans Peter Reiseraus Passau2006Amtierender Dekan: Prof. Dr. Helmuth PartschGutachter: Prof. Dr. Franz J. HauckGutachter: Prof. Dr. Peter DadamTag der Promotion: 15. Dezember 2006iiiAbstractUsingobject-basedmiddlewareinfrastructuresispopularforthedevelopmentofservices in distributed systems. Active object replication is a suitable strategyto increase the availability of such services. Existing replication architectures,however, show some deficiencies in their flexibility and reconfigurability.This thesis presents the FTflex architecture, which extends the CORBA-based Aspectix middleware with flexible and reconfigurable replication mecha-nisms. Thecontributionsofthisthesissupportthedevelopmentofreplicatedob-jects, enable a deterministic execution of object methods with multiple threads,and provide a flexible and dynamically reconfigurable group communicationsystem.First of all, this thesis designs an efficient replication architecture on thebasis of fragmented objects. The presented solution offers transparency forclients and allows the relocation of parts of the service functionality to theclient side. The developer of a replicated object can use semantic annotationsto optimise the replication strategies.