Krzysztof Zielinski

AAOP-based dynamically reconfigurable monitoring system

A key aspect of resource management is efficient and effective deployment of available resources whenever needed. The issue typically covers two areas: monitoring of resources used by software systems and managing the consumption of resources. A key aspect of each monitoring system is its reconfigurability - the ability of a system to limit the number of resources monitored at a given time to those that are really necessary at any particular moment. The authors of this article propose a fully dynamic and reconfigurable monitoring system based on the concept of Adaptable Aspect-Oriented Programming (AAOP) in which a set of AOP aspects is used to run an application in a manner specified by the adaptability strategy. The model can be used to implement systems that are able to monitor an application and its execution environment and perform actions such as changing the current set of resource management constraints applied to an application if the application/environment conditions change. Any aspect that implements a predefined interface may be used by the AAOP-based monitoring system as a source of information. The system utilizes the concept of dynamic AOP, meaning that the aspects (which are sources of information) may be dynamically enabled/disabled.

Semantic-based Dynamic Service Composition and Adaptation

This paper presents a semantic-based dynamic service composition and adaptation framework. It explores WSMO, a starting point for the semantic-based composer construction using backward-chaining reasoning. WSMO and the orchestration procedure proposed by this model are described, together with the architecture of the proposed framework for semantic-based dynamic service composition and adaptation. The backward-chaining composer and Mule-based executor, are essential parts of the proposed framework. Its usage is illustrated by examples.

JIMS extensions for resource monitoring and management of solaris 10

This paper describes extensions of the JIMS system with selected mechanisms of Solaris 10 resources monitoring and management. The proposed extensions together with JIMS functionality create a foundation for the adaptive layer implementation of large distributed computer systems. The proposed solution addresses a heterogeneous self-configuring execution environment typical of Grids system. The paper presents not only the innovative concept of the proposed extensions but their existing implementation.

Open interface for autonomic management of virtualized resources in complex systems - construction methodology

This paper is a practical report presenting the methodology for constructing an open interface for the autonomic management of virtual resources in complex systems. The described methodology supports most of the autonomic computing system requirements. The presented approach is general and can be applied to different levels of distributed computing systems, ranging from physical resources, through virtualized subsystems, up to application servers and software components. The proposed solution, illustrated by the JIMS framework, fully exploits the potential of the contemporary virtualization, SOA and Java technologies for open system implementation and management, such as JMX and Web Services. As a case study, an open interface construction for the management of Solaris 10 resources has been described in detail. Many practical remarks have been made, including conclusions drawn from system implementation. The discussion of the presented solution forms a background for more general reflections about technologies that could be exploited to build autonomic computing systems.

Framework for application management with dynamic aspects J-EARS case study

The cost of computer system maintenance rises together with the increasing complexity of such systems. The use of an autonomic system architecture saves money by delegating some forms of maintenance to the systems themselves. The aim of this paper is to describe the results of creating a tool which introduces elements of adaptivity to Java applications using dynamic aspects. The impact of introducing aspects on the performance of various Application Servers is also discussed. Finally, benefits and problems arising from the use of the tool are presented, basing on sample use cases.

Role of n1 technology in the next generation grids middleware

This paper addresses problem of the middleware for Next Generation Grid construction and presents how two important concepts such as virtualization and provisioning could satisfy some major requirements of these systems. A vision of NGG is presented and requirements set on middleware layer are analyzed. Next an enabling technology for NGG is considered . The concept of virtualization and provisioning of grid resources is explained. Finally case study illustrating N1 technology application usage is presented.

SOA-Compliant Programming Model for Intelligent Sensor Networks -- SCA-Based Solution

The role of intelligent sensor networks has been growing rapidly over the past years. New sensor devices such as Sun SPOT or Sentilla are equipped with processors capable of running the JVM machine. This opens new possibilities for full integration of such devices with enterprise applications and also for extending their programming models to cover sensor networks. A uniform programming model shared between sensor networks and standard computers would bring numerous benefits. The paper presents an extension of the SCA programming model to include intelligent sensors. The architecture of such an extension is proposed and an initial prototype implementation is presented. The solution utilizes a proxy pattern, validated by a simple case study using Sun SPOTs and Sentilla. The advantages and limitations of the proposed extension are also discussed.