Service orientation fosters a high-level model for distributed applications development, which is based on the discovery, composition and reuse of existing software services. However, the heterogeneity among current service-oriented technologies renders the important task of service discovery tedious and ineffective. This dissertation proposes a new approach to address this challenge. Specifically, it contributes a framework supporting the unified discovery of heterogeneous services, with a focus on web, peer-to-peer, and grid services. The framework comprises a service query language and its enacting service discovery engine. Overall, the proposed solution is characterized by generality and flexibility, which are ensured by appropriate abstractions, extension points, and their sup- porting mechanisms. The viability, performance, and effectiveness of the proposed framework are demonstrated by experimental measurements.
Many service discovery frameworks have also embraced semantic web technologies to improve precision and recall of the matchmaking process, as it is reported in @cite_30 @cite_7 @cite_0 . However, such approaches mainly focus on support for the evaluation of functional search criteria, they are constrained to specific types of service brokers, and generally lack flexibility. Other efforts have tackled the challenge of multi-dimensional query evaluation @cite_5 @cite_4 , or the heterogeneity in service discovery mechanisms @cite_26 @cite_31 . Even though the proposed system architectures are characterized by flexibility, they exclusively support the discovery of web services and thus their solution is not applicable to other types of services.
@cite_30 @cite_26 @cite_4 @cite_7 @cite_0 @cite_5 @cite_31
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The ubiquitous computing vision is to make knowledge and services easily available in our everyday environments. A wide range of devices, applications and services can be interconnected to provide intelligent and automatic systems that make our lives more enjoyable and our workplaces more efficient. Interaction typically is to be between peers rather than clients and servers. In this context, the JXTA peer-to-peer infrastructure, designed for interoperability, platform independence and ubiquity, is a suitable foundation to build future computer systems on. Peers need ways to effortlessly discover, consume and provide services, and to take advantage of new services as they become available in a dynamically changing network. However, JXTA does not currently handle this servicediscovery problem. In this paper, we examine several service-discovery architectures, to see whether they can be adapted to JXTA. We conclude that none of them adequately support the flexibility and expressiveness that ubiquitous computing requires. We therefore argue that Web Ontology Language (OWL) and OWL Services (OWL-S) ontologies should be used to express detailed semantic information about services, devices and other service-discovery concepts. This kind of approach allows peers to reason about service offerings and achieve intelligent service discovery by using an inference engine. We present an experimental implementation of this ontological approach to service-discovery, called Oden (Ontology-based Discovery- This paper presents an innovative approach for the publication and discovery of Web services. The proposal is based on two previous works: DIRE (DIstributed REgistry), for the user-centered distributed replication of service-related information, and URBE (UDDI Registry By Example), for the semantic-aware match making between requests and available services. The integrated view also exploits USQL (Unified Service Query Language) to provide users with a higher level and homogeneous means to interact with the different registries. The proposal improves background technology in different ways: we integrate USQL as high-level language to state service requests, widen user notifications based on URBE semantic matching, and apply URBE match making to all the facets with which services can be described in DIRE. All these new concepts are demonstrated on a simple scenario. We extend the service abstraction in the Open Grid Services Architecture ogsa for Quality of Service (QoS) properties. The realization of QoS often requires mechanisms such as advance or on-demand reservation of resources, varying in type and implementation, and independently controlled and monitored. propose the GARA FostKessl99 architecture. The GARA library provides a restricted representation scheme for encoding resource properties and the associated monitoring of Service Level Agreements (SLAs). Our focus is on the application layer, whereby a given service may indicate the QoS properties it can offer, or where a service may search for other services based on particular QoS properties. The potential of a large-scale growth of private and semi-private registries is creating the need for an infrastructure that can support discovery and publication over a group of autonomous registries. Recent versions of UDDI have made changes to accommodate interactions between distributed registries. In this paper, we discuss an ontology-based Web service discovery infrastructure (METEOR-S Web Service Discovery Infrastructure), to provide access to registries that are divided based on business domains and grouped into federations. In addition, we discuss how Web service discovery is carried out within a federation. We provide a novel discovery algorithm, which addresses semantic heterogeneity with respect to multiple ontologies from the same domain. We also show through preliminary results of our empirical evaluation that even when services are annotated with different ontologies, our algorithm is able to find good matches and eliminate false matches by considering the context and the coverage information of the annotated concepts. The increasing availability of web services necessitates efficient discovery and execution framework. The use of xml at various levels of web services standards poses challenges to the above process. OWL-S is a service ontology and language, whose semantics are based on OWL. The semantics provided by OWL support greater automation of service selection, invocation, translation of message content between heterogeneous services, and service composition. The development and consumption of an OWL-S based web service is time consuming and error prone. OWL-S IDE assists developers in the semantic web service development, deployment and consumption processes. In order to achieve this the OWL-S IDE uses and extends existing web service tools. In this paper we will look in detail at the support for discovery for semantic web services. We also present the matching schemes, the implementation and the results of performance evaluation. Service discovery has been recognized as an important aspect in the development of service-centric systems, i.e., software systems which deploy Web services. To develop such systems, it is necessary to identify services that can be combined in order to fulfill the functionality and achieve quality criteria of the system being developed. In this paper, we present a framework supporting architecture-driven service discovery (ASD)â€”that is the discovery of services that can provide functionalities and satisfy properties and constraints of systems as specified during the design phase of the development lifecycle based on detailed system design models. Our framework assumes an iterative design process and allows for the (re-)formulation of design models of service-centric systems based on the discovered services. The framework is composed of a query extractor, which derives queries from behavioral and structural UML design models of service-centric systems, and a query execution engine that executes these queries against service registries based on graph matching techniques. The article describes a prototype tool that we have developed to demonstrate and evaluate our framework and the results of a set of preliminary experiments that we have conducted to evaluate it. The challenge of publishing and discovering Web services has recently received lots of attention. Various solutions to this problem have been proposed which, apart from their offered advantages, suffer the following disadvantages: (i) most of them are syntactic-based, leading to poor precision and recall, (ii) they are not scalable to large numbers of services, and (iii) they are incompatible, thus yielding in cumbersome service publication and discovery. This article presents the principles, the functionality, and the design of PYRAMID-S which addresses these disadvantages by providing a scalable framework for unified publication and discovery of semantically enhanced services over heterogeneous registries. PYRAMID-S uses a hybrid peer-to-peer topology to organize Web service registries based on domains. In such a topology, each Registry retains its autonomy, meaning that it can use the publication and discovery mechanisms as well as the ontology of its choice. The viability of this approach is demonstrated through the implementation and experimental analysis of a prototype.