Web Service Broker

Práce se zabývá studiem technologií webových služeb, možností jejich vyhledávání a implementací systémů určených k registraci a vyhledávání webových služeb, tzv. adresářů. Blíže se věnuje adresáři UDDI (The Universal Description, Discovery and Integration), jeho datovým strukturám, programovému rozhranní a problematice registrace služby a jejího vyhledání s využitím UDDI. Hlavní část práce je zaměřena na implementaci části standardu UDDI v.3.0.2 pro účely demonstrace registrace a vyhledání služby v adresáři typu UDDI. Výsledná aplikace má sloužit při výuce problematiky webových služeb. Aplikace je napsána v programovacím jazyce C++ s využitím SŘBD Firebird, knihoven pro komunikaci s databází IBPP a C++ toolkitu pro vývoj webových služeb v C++ - gSOAP.The thesis deals with the study of the technology of web services and how to search for them, and with the implementation of systems used for registration of and searching for web services - directories. Greater attention is paid to the UDDI (The Universal Description, Discovery and Integration) directory, its data structures, program interface and problems related to registration of the service and searches using UDDI. The main part of the study deals with the implementation of a part of UDDI standard version 3.0.2 for the demonstration of the registration and search of the service in a UDDI type directory. The resultant application should be used for teaching problems concerning web services. It is written in C++ programming language using Firebird, libraries for communication with Firebird database IBPP and C++ toolkit for the development of web services in C++ - gSOAP.

A service broker for Intercloud computing

This thesis aims at assisting users in finding the most suitable Cloud resources taking into account their functional and non-functional SLA requirements. A key feature of the work is a Cloud service broker acting as mediator between consumers and Clouds. The research involves the implementation and evaluation of two SLA-aware match-making algorithms by use of a simulation environment. The work investigates also the optimal deployment of Multi-Cloud workflows on Intercloud environments

Service broker for cloud service description language

Cloud Service Description Language (CSDL), initiative and discourse, is concentrated to deploy applications on various cloud platforms without modifying source-code. Semantic topology and orchestration of applications provides practical advantage for service providers with ability of interoperability, portability and unified interfaces. However, this has also resulted problems for consumers to identify the appropriate services spread over swarm platforms. The advantage, with common CSDL such as Topology and Orchestration Specification for Cloud Applications (TOSCA), becomes problematic for consumers. Service providers will have different technical and business details such as: discovery, pricing, licensing or composition depending upon deployed platform; therefore, selection of service becomes challenging and requires human effort. Service Broker design is presented for TOSCA framework only; however, the suggested scheme is generic and adaptable to accommodate similar standards of CSDL

A template description framework for services as a utility for cloud brokerage

Integration and mediation are two core functions that a cloud service broker needs to perform. The description of services involved plays a central role in this endeavour to enable services to be considered as commoditised utilities. We propose a conceptual framework for a cloud service broker based on two parts: a reference architecture for cloud brokers and a service description template that describes the mediated and integrated cloud services. Structural aspects of that template will be identified, formalised in an ontology and mapped onto a set of sublanguages that can be aligned to the cloud development and deployment process

Automatic Web Service Selection by Service Broker

　本稿ではWebサービス自動選択の背景を紹介して、Webサービスの検索また選択の技術の現状、未解決問題点について説明した。サービス自動選択を実現するための既存研究を紹介し、この研究の不足点について述べて、サービスブローカを導入する手法を提案した。次には該当手法について二つの応用モデルが存在することとそれぞれの利用手順、適用場面を説明した。また該当手法の利点を述べた。さらに該当手法の前提条件としてサービスのインターフェースを統合する問題について説明した。最後は実例として、シミュレーションでこの手法の利点を示す。修士論

Dynamic congestion management system for cloud service broker

This is an open access article licenced under a CC-BY-SA license, https://creativecommons.org/licenses/by-sa/4.0/The cloud computing model offers a shared pool of resources and services with diverse models presented to the clients through the internet by an on-demand scalable and dynamic pay-per-use model. The developers have identified the need for an automated system (cloud service broker (CSB)) that can contribute to exploiting the cloud capability, enhancing its functionality, and improving its performance. This research presents a dynamic congestion management (DCM) system which can manage the massive amount of cloud requests while considering the required quality for the clients’ requirements as regulated by the service-level policy. In addition, this research introduces a forwarding policy that can be utilized to choose high-priority calls coming from the cloud service requesters and passes them by the broker to the suitable cloud resources. The policy has made use of one of the mechanisms that are used by Cisco to assist the administration of the congestion that might take place at the broker side. Furthermore, the DCM system is used to help in provisioning and monitoring the works of the cloud providers through the job operation. The proposed DCM system was implemented and evaluated by using the CloudSim tool.Peer reviewe

Service brokerage with Prolog

Service brokerage is a complex problem. At the design stage the semantic gap between user, device and system requirements must be bridged, and at the operational stage the conflicting objectives of many parties in the value chain must be reconciled. For example why should a user who wants to watch a film need to understand that due to limited battery power the film can only be shown in low resolution? Why should the user have to understand the business model of a content provider? To solve these problems we present (1) the concept of a packager who acts as a service broker, (2) a design derived systematically from a semi-formal specification (the CC-model), and (3) an implementation using our Prolog based LicenseScript language