Components in an adaptive and QoS-based architecture

Abstract

This paper aims to present the main software components we have developed in the context of the ARM (Adaptive Resource Management) project at University of Milano-Bicocca for an adaptive, distributed, service-oriented architecture. The goal of ARM is to manage the resources of a system in a way that enables it to dynamically identify and execute services on the available resources. Our approach chooses the most appropriate resource that is able to execute a service with the requested qualities of service (QoSs). To achieve adaptivity, ARM uses reflection at the architectural level. Exploiting the reflective representation of the system's resources and their related QoSs, ARM may organize them accordingly to various criteria and evaluate them based on their QoSs features and their potentiality in executing a requested service with the requested QoSs. To validate the ARM concepts, a prototype based on the peer-to-peer paradigm is currently under development. It aims to provide an adaptive support when using the resources available in our department.

Exploiting Reflection to Design and Manage Services for an Adaptive Resource Management System

“…We have implemented the causal connection mechanism exploiting the Observer design pattern [12]. For more implementation details see [17,20].…”

“…Adaptive strategies have been implemented using the Strategy [12] design pattern. For more implementation details see [17,20].…”

“…To capture also these aspects we have introduced two additional reflective properties and views: the location and the topology one (see Figure 6). For more details see [17,20]. Figure 6.…”

Frameworks for the Development of Adaptive Systems: Evaluation of Their Adaptability Feature Through Software Metrics

“…Essentially, they result from the need to address the growing complexity of emerging system and improve productivity and performance, as well as automate configuration, re-configuration, control, and management tasks [7] The scientific literature presents various frameworks [2,3,8], each proposing a different approach for the design and implementation of adaptive mechanisms. For example, the Rainbow framework [2] proposes a control loop which defines mechanisms to monitor the runtime properties of a system, to evaluate constraint violations, and to perform global and module level adaptations on a running system.…”

A Java mobile-enabled environment to access adaptive services

“…To achieve these goals it exploits reflection at the architectural level [3,8]. For more details related to the adaptivity feature and to the design of the reflective entities of our middleware, as well as to the definition and mapping of the requested qualities of services on the features of the physical components see [12,13,14]. In this paper attention is focused on the communications aspects, including the definition of services, of a protocol through which services are provided and required and of communication services among peers.…”