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Combining Service-Oriented and Event-Driven Architectures for Designing Dependable Systems

Lodi G., Querzoni L, Beraldi R., Baldoni R.

Foundations of Computing and Decision Sciences

2010

Vol. 35, No. 2

78-90

Up to now Service Oriented Architectures and Event Driven Architectures have been considered as competing parties striving to conquer the crown of the standard paradigm for the implementation of complex distributed applications. Todays we are witnesses of large efforts to merge both paradigms and give birth to a new generation of middleware platforms that will inherit the best of both worlds. In this paper we describe how this marriage could be leveraged in order to design new dependable software systems.

Multidatabase global concurrency control algorithms : a performance analysis

Quaglia F., Baldoni R., Ciciani B.

Foundations of Computing and Decision Sciences

1998

Vol. 23, No. 1

15-33

The ticket-based concurrency control allows the management of indirect conflicts between multidatabase transactions without violating site autonomy and ensuring global serializability. In this paper, by using discrete event simulation models, we compare two global concurrency control algorithms: the Optimistic Ticket Method (OTM) and the Multidatabase Timestamp Mechanism (MTSM). Performance of those algorithms strongly depend on the local concurrency control scheme at each site. Hence, we propose two optimizations of MTSM: one for the case of timestamp-based local concurrency control, the other for the case of optimistic local concurrency control. The proposed solutions reduce the ticket contention improving performance.