Jörg Domaschka

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The benefits of cloud computing have led to a proliferation of infrastructures and platforms covering the provisioning and deployment requirements of many cloud-based applications. However, the requirements of an application may change during its life cycle. Therefore, its provisioning and deployment should be adapted so that the application can deliver its(More)
This paper describes a novel approach to fault-tolerance in distributed object-based systems. It uses the fragmented-object model to integrate replica-tion mechanisms into distributed applications. This approach enables the use of customised code on a per-object basis to access replica groups and to manage consistency. The addition of fault tolerance to the(More)
Determinism is mandatory for replicating distributed objects with strict consistency guarantees. Multithreaded execution of method invocations is a source of nondeterminism, but helps to improve performance and avoids deadlocks that nested invocations can cause in a single-threaded execution model. This paper contributes a novel algorithm for deterministic(More)
Distributed object-oriented applications are commonly implemented atop middleware platforms such as CORBA, .NET Remoting, and Java remote method invocation (RMI). These platforms provide a simple mechanism to invoke methods of remote objects. Increasingly more applications are demanding nonfunctional properties such as fault tolerance, high availability,(More)
Business Process Management Systems (BPMSs) found broad application in recent years and there have been first suggestions how Complex Event Processing (CEP) can support or complement BPMS functionality. Though some business suites already provide technical integration of BPMSs and CEP engines, many benefits still remain undiscovered. We describe(More)
This paper describes a novel approach to deterministic multithreading for active replication of Java objects. Unlike other existing approaches, the presented deterministic thread scheduler fully supports the native Java synchronisation mechanisms, including reentrant locks, condition variables, and time bounds on wait operations. Furthermore, this paper(More)
Cloud computing is currently classified by the generally accepted terms IaaS, PaaS and SaaS. These are not precise enough to give users and providers a common terminology to differentiate between existing cloud offers. Furthermore, there is no common and accepted terminology for storage and network cloud services. Terms like StaaS and NaaS have been coined(More)
Replicating objects usually requires deterministic behaviour for maintaining a consistent state. Multithreading is a critical source of non-determinism, completely unsupported in most fault-tolerant middle-ware systems. Recent publications have dened deterministic scheduling algorithms that operate at the middleware level and allow multi-threading for(More)