The thesis summarizes the history of enterprise application integration and shows the estimated benefits and risks that arise from attempts to harmonize corporate IT infrastructure. It also describes the main approaches to the integration and evaluates their resistance in terms of time. The thesis relates a modern interpretation of the integration of SOA (Service Oriented Architecture), including related standards. Particular attention is paid to the life cycle of services in SOA. It explains possible approaches and key principles of communication layer integrated business application system in terms of architectural design. The last part of the thesis examines for opportunities, risks and benefits of system application integration within the SOA implementation and assesses the economics of integration and the question of the investment protection.

Service Oriented Computing (SOC) provides a framework for the realization of loosely couple service oriented applications (SOA). Web services are central to the concept of SOC. They possess several benefits which are useful to SOA e.g. encapsulation, loose coupling and reusability. Using web services, an application can embed its functionalities within the business process of other applications. This is made possible through web service composition. Web services are composed to provide more complex functions for a service consumer in the form of a value added composite service. Currently, research into how web services can be composed to yield QoS (Quality of Service) optimal composite service has gathered significant attention. However, the number and services has risen thereby increasing the number of possible service combinations and also amplifying the impact of network on composite service performance. QoS-based service composition in the cloud addresses two important sub-problems; Prediction of network performance between web service nodes in the cloud, and QoS-based web service composition. We model the former problem as a prediction problem while the later problem is modelled as an NP-Hard optimization problem due to its complex, constrained and multi-objective nature. This thesis contributed to the prediction problem by presenting a novel learning automata-based non-negative matrix factorization algorithm (LANMF) for estimating end-to-end network latency of a composition in the cloud. LANMF encodes each web service node as an automaton which allows v it to estimate its network coordinate in such a way that prediction error is minimized. Experiments indicate that LANMF is more accurate than current approaches. The thesis also contributed to the QoS-based service composition problem by proposing four evolutionary algorithms; a network-aware genetic algorithm (INSGA), a K-mean based genetic algorithm (KNSGA), a multi-population particle swarm optimization algorithm (NMPSO), and a non-dominated sort fruit fly algorithm (NFOA). The algorithms adopt different evolutionary strategies coupled with LANMF method to search for low latency and QoSoptimal solutions. They also employ a unique constraint handling method used to penalize solutions that violate user specified QoS constraints. Experiments demonstrate the efficiency and scalability of the algorithms in a large scale environment. Also the algorithms outperform other evolutionary algorithms in terms of optimality and calability. In addition, the thesis contributed to QoS-based web service composition in a dynamic environment. This is motivated by the ineffectiveness of the four proposed algorithms in a dynamically hanging QoS environment such as a real world scenario. Hence, we propose a new cellular automata-based genetic algorithm (CellGA) to address the issue. Experimental results show the effectiveness of CellGA in solving QoS-based service composition in dynamic QoS environment.

Although service oriented architecture has reached a particular maturity level especially in the technological dimension, there is a lack of common and acceptable approach to design a software system through composition and integration of web services. In this thesis, a service oriented system design approach for Service Oriented Architecture based software development is introduced to fill this gap. This new methodology basically offers a procedural top-down decomposition of a given software system allowing several abstraction levels. At the higher levels of the decomposition, the system is divided into abstract nodes that correspond to process models in the decomposition tree. Any node is a process and keeps the sequence and the state information for the possible sub-processes in this decomposition tree. Nodes which are defined as process models may include some sub-nodes to present details for the intermediate levels of the model. Eventually at the leaf level, process models are decomposed into existing web services as the atomic units of system execution. All processes constructing the system decomposition tree are modeled with BPEL (Business Process Execution Language) to expose the algorithmic details of the design. This modeling technique is also supported with a graphical modeling language referred to as SOSEML (Service Oriented Software Engineering Modeling Language) that is also newly introduced in this thesis.

Das Gebiet der Serviceentwicklung im Rahmen serviceorientierter Architekturen, als auch der Bereich der Geschäfts­prozessmodellierung gewannen in den letzten Jahren zunehmend an Bedeutung. Aus fachlicher Sicht stellt die Analyse, Simulation und Optimierung aktueller und zukünftiger Geschäftsprozesse ein wertvolles Instrument zur Erkennung von Schwachstellen und der Verbesserung der Leistungsfähigkeit von Unternehmen dar. Aus IT-Sicht bietet die Service­orientierung die Möglichkeit, Unternehmensressourcen über öffentliche und private Schnittstellen verfügbar, und damit die Position des Unternehmens im Netzwerk von Lieferanten, Kunden und Geschäfts­partnern zu stärken. Den Kern dieser Arbeit bildet die Untersuchung des Spannungsfeldes zwischen fachlicher Geschäfts­­­prozess- und Servicemodellierung, sowie der Ausführung von Geschäftsprozessen auf techni­scher Ebene, die durch Services unterstützt werden. Im Fokus der Betrachtung liegt der unter­nehmens- bzw. organisations­übergreifende Bereich, insbesondere der Finanzdienst­leistungs­sektor. Zu Beginn der Arbeit wird ein allgemeines Begriffsverständnis zu Bereichen Service- und Prozess­modellierung geschaffen, die im Hauptteil der Arbeit verfeinert und ergänzt werden, um die Beson­der­heiten und Problemfelder für den überbetrieblichen Bereich verständlich zu machen. Dabei wird das RosettaNet-Frame­work als Rahmenwerk zur Gestaltung von elektronischen Geschäfts­prozessen beschrieben und im letzten Teil der Arbeit zur Implementierung eines konkreten Geschäfts­­prozesses im Vertriebsprozess heran­gezogen. Zu diesem Zweck wird der ORACLE WebLogic Application Server verwendet.:1 Einleitung 2 Grundlagen der Service- und Prozessmodellierung 2.1 Grundlagen der Servicemodellierung 2.2 Grundlagen der Geschäftsprozessmodellierung 2.3 Zusammenhänge zwischen Prozess- und Servicemodellierung 2.4 Zusammenfassung 3 Entwicklung organisationsübergreifender Prozesse und Services 3.1 Motivation und Zweck unternehmensübergreifender Prozesse 3.2 Grundlagen öffentlicher Prozesse 3.3 Grundlagen öffentlicher Services 3.4 Organisation und Architektur unternehmensübergreifender Prozesse und Services 3.5 Organisationsübergreifende Prozesse am Beispiel von RosettaNet 4 Unterstützung des Vertriebs im Finanzdienstleistungsbereich durch RosettaNet 4.1 Referenzprozess Vertrieb als Beispiel eines unternehmensübergreifenden Prozesses 4.2 Fallbeispiel Bestellung im Rahmen des Vertriebsprozesses 4.3 Implementierung des Fallbeispiels mit dem ORACLE WebLogic Server 4.4 Modellierung des Vertriebsprozesses mithilfe der Business Process Modeling Notation 5 Schluss

In this thesis, a service oriented decomposition approach: Use case Driven Service Oriented Architecture (UDSOA), is introduced to close the gap between business requirements and SOA (Service Oriented Architecture) design by including business use cases and system use cases into decomposition process. The approach is constructed upon Service Oriented Software Engineering (SOSE) modeling technique and aims to fill the deficits of it at the decomposition phase. Further, it aims to involve both business vision and Information Technologies concerns in the decomposition process. This approach starts with functional top-down decomposition of the domain. Then, business use cases are used for further decomposition because of their high-level view. This connects the business requirements and our SOA design. Also it raises the level of abstraction which allows us to focus on business services. Second step of the SOA approach uses system use cases to continue decomposition. System use cases help discovering technical web services and allocating them on the decomposition tree. Service oriented analysis also helps separating business and technical services in tightly coupled architecture conditions. Those two steps together bring quality in to both problem and solution domains.

Service Oriented Architecture (SOA) together with Enterprise Architecture (EA) has became a main essence on the way to improve an alignment between business and IT representatives. The result of this alignment should be an increased efficiency of delivering IT projects in the company. Last decade it was the number one declined word in many companies. But most of them found out that SOA did not bring them expected results. The thesis deals with the methodology of building information systems and information and communication technology (IS/ICT) in SOA environment. It is a part of the research plan of the Department of Information Technologies of University of Economics in Prague. The main objective of the thesis is to extend the methodological framework MeFIS2 to add methodical pattern "Building IS in service-oriented architecture environment". In the analytical part of the thesis are presented and analyzed selected methodologies and standards focused on service orientation with aim to assist in the implementation of SOA into companies. A large amount of such methodologies and standards have been unveiled what leaded to a confusing information labyrinth. It's one of the reasons why standardization organizations gradually began to issue additional standards and methodologies to assist in the proper implementation of SOA into companies. The main part of work is to extend methodological framework MeFIS, so that it can be used to create a methodological pattern for building IS/ICT in SOA environment. The result of this section is to achieve the main goal to create a methodological pattern "Building IS in service-oriented architecture environment". In the practical part is the proposed methodological pattern applied in the real case study in the environment of telecommunication operator.