Jacek Kobusiński

D-reserve: distributed reliable service environment

Nowadays, a major paradigm of large scale distributed processing is service-oriented computing. To improve the availability and reliability of the SOA-based systems and applications, a Reliable Service Environment ReServE, providing an external support of web services recovery, has been proposed. The functionality of ReServE can be enhanced by distributing its architecture. However, this causes several problems, which have to be solved. In this paper we address these problems and propose their solution.

Healthcare Integration Platform

In this paper we tackle the issue of exchanging and integrating medical information originating from different health care information systems. We propose a solution — Healthcare Integration Platform (HIP) — which utilises some of the concepts contained in the IHE profiles [1] combined with the existing EHR standards in order to maintain a high level of interoperability. We confirm the value of our solution by presenting a working prototype based on our concepts. The prototype relies on the Service Oriented Architecture paradigm using RESTful web services.

FAST Failure Detection Service for Large Scale Distributed Systems

This paper addresses the problem of building a failure detection service for large scale distributed systems. We describe failure detection service, which merges some novel proposals and satisfies scalability, flexibility and adaptability properties. Afterwards, we present the architecture of such a service, show detailed information about its components and present the simulation results concerning performance.

FaDe: RESTful service for failure detection in SOA environment

FaDe service is a novel proposal of failure detection service based on REST paradigm for SOA environment. It is fully distributed service. Internal communication between FaDe nodes can be realized using two communication protocols (gossip, Kademlia). It makes the nodes cooperation efficient and provide good level of scalability. The failure monitoring is based on accrual failure detector which provides flexibility in the context of different client expectations considering the speed and accuracy of detections.

Dependability Infrastructure for SOA Applications

This chapter describes two tools for improving dependability of SOA-based applications: ReSP (Reliable SOA Platform) and DyMST (Dynamic Management SOA Toolkit). ReSP is a set of modules to improve dependability in respect to availability and reliability, and to some extent safety. It is comprised of the mechanisms of reliable group communication, replication, recovery, and transaction processing. DyMST is a set of components for failure detection, monitoring and autonomic management, and distributed security policy enforcement. In order to show the dependability aspects of real applications and usage of these tools, two case studies from the medical healthcare domain are presented: Healthcare Integration Platform for the exchange of patients’ medical data among various healthcare units, and Medical Event, and Data Registering Platform for daily work improvement of medical staff.

Failure detection in a RESTful way

FaDe service is a novel proposal of failure detection service based on the REST paradigm for the SOA environment. Modularity of architecture allows to build generic service that can be further optimized. FaDe service is fully distributed and provide two communication protocols (gossip, Kademlia) that allow FaDe nodes to cooperate efficiently and make FaDe very scalable. Failure monitoring is based on accrual failure detector which provides flexibility in the context of different client expectations considering the speed and accuracy of detections.

Skip ring topology in fast failure detection service

This paper addresses the problem of communication among loosely coupled groups of nodes in distributed systems. We describe a novel proposal of logical communication topology based on skip list data structure. We enhance this structure to make it more resilient to failures. Its good self-stabilization characteristics are shown through extensive simulation experiments. We present this new concept in the context of our failure detection service, where we use it at a local communication level.

Bounding recovery time in rollback-recovery protocol for mobile systems preserving session guarantees

This paper addresses a problem of integrating the consistency management of session guarantees with recovery mechanisms in distributed mobile systems. To solve such a problem, rollback-recovery protocol rVsSG, preserving session guarantees is proposed. The protocol employs known rollback-recovery techniques, however, while applying them, the semantics of session guarantees is taken into account. Consequently, rVsSG protocol is optimized with respect to session guarantees requirements. The paper includes the proof of safety property of the presented protocol.

Multi-version coherence protocol for replicated shared objects

Sequential consistency is one of the strongest consistency models for replicated shared data. The performance of a system supporting this model is rather low, so weaker models are used to improve the efficiency. However, the construction of application for weaker models is more complicated. The idea of this approach is to provide the data to the application along with the consistency model to which they conform. This allows the application to decide about the quality of accessed data.

Mobile platform for executing medical business processes and data collecting

Medicine becomes more and more complex domain. The process from patient registration through to the provision of the right treatment becomes complex and sophisticated, and any mistakes or inaccuracies can have a significant consequences for both the patient and the care professionals. This paper presents a MMDCP -- Medical Mobile Data Collecting Platform, which aims is to reduce the error rate and speed up the process of data collection. Since medical staff should have the access to medical data from any place of the healthcare facility, the MMDCP provides its users the mobility. The proposed platform also distinguishes itself with flexibility, simplicity of maintenance and integration.