Service Oriented Architecture Applications Research Articles

A Framework and Language Support for Dynamic Security Policy in Service-Oriented Architecture

In today's global network-based environment, where mission-critical applications typically run on highly distributed systems, customers expect reliable, available, and secure services. Supporting security becomes an important issue in service-oriented architecture (SOA). This paper describes how to simultaneously support both dynamic security policies and separation of concerns when developing an SOA application. We propose the DPSL (dynamic policy specification language) for managing and controlling the security according to the dynamic behavior of the workflow in SOA. The operation model is compatible with existing SOA standards, such as the WSDL, WS-Policy, WS-Security- Policy, WS-ReliableMessaging, and the BPEL. As a result, existing standard Web-services engines and BPEL engines can be employed directly to support dynamic policies in SOA. The implementation and experimental results demonstrate the feasibility of the proposed architecture.

Engineering of web services for internet of things applications

This paper addresses web services for Internet of Things (IoT) applications. The research focus is on IoT applications for mobile monitoring and third party's database access. Both web services design aspects and deployment issues are studied. By synthesis of functional abstraction for configuration management and performance monitoring, an approach to design RESTful web services for mobile monitoring is suggested. In addition to traditional operations supported by Database Management Systems, web services' operations for subscription management and notifications about occurrences of specific data-related events, as well as operations for trust and security management are proposed in the context of third party's database access. Web services deployment issues concern the access control aimed to prevent from overloading. A formal method for a model-based load evaluation of SOA (Service Oriented Architecture) application server is suggested. The method takes into account the distributed server architecture and the processing of heterogeneous traffic. The SOA application server's utilization is evaluated by simulation.

An approach to SOA development methodology: SOUP comparison with RUP and XP

Service oriented architecture (SOA) is an architecture for distributed applications composed of distributed services with weak coupling that are designed to meet business requirements. One of the research priorities in the field of SOA is creating such software design and development methodology (SDDM) that takes into account all principles of this architecture and allows for effective and efficient application development. A lot of investigation has been carried out to find out whether can one of popular SDDM, such as agile methodologies or RUP suits, be adapted for SOA or there is a need to create some new SOA-oriented SDDM. This paper compares one of SOA-oriented SDDM – SOUP – with RUP and XP methodologies. The aim is to find out whether the SOUP methodology is already mature enough to assure successful development of SOA applications. This aim is accomplished by comparing activities, artifacts of SOUP and RUP and emphasizing which XP practices are used in SOUP. DOI: http://dx.doi.org/10.15181/csat.v2i1.77

Application of service oriented architecture for sensors and actuators in district heating substations.

Hardwired sensor installations using proprietary protocols found in today's district heating substations limit the potential usability of the sensors in and around the substations. If sensor resources can be shared and re-used in a variety of applications, the cost of sensors and installation can be reduced, and their functionality and operability can be increased. In this paper, we present a new concept of district heating substation control and monitoring, where a service oriented architecture (SOA) is deployed in a wireless sensor network (WSN), which is integrated with the substation. IP-networking is exclusively used from sensor to server; hence, no middleware is needed for Internet integration. Further, by enabling thousands of sensors with SOA capabilities, a System of Systems approach can be applied. The results of this paper show that it is possible to utilize SOA solutions with heavily resource-constrained embedded devices in contexts where the real-time constrains are limited, such as in a district heating substation.

Service Constraint Guarantees

In this paper we investigate the problem of providing consistency, availability and durability for Web Service transactions. We consider enforcement of integrity constraints in a way that increases the availability while guaranteeing the correctness specified in the constraint. We study hierarchical constraints that offer an opportunity for optimization because of an expensive aggregation calculation required in the enforcement of the constraint. We propose an approach that guarantees enforcement of constraints and also allow the distribution of write operations among many clusters to increase the availability. In our previous work, we proposed a replica update propagation method, called the Buddy System, which guaranteed durability and increased availability of web services. In this paper, we extend the Buddy System to enforce hierarchical data integrity constraints. En terprise web-based transaction systems need to support many concurrent clients simultaneously accessing shared resources. These applications are often developed using a Service Oriented Architecture (SOA). SOA supports the composition of multiple Web Services (WSs) to perform complex business processes. One of the important aspects for SOA applications is to provide a high-level of concurrency; we can think of the measure of the concurrency as the availability of the service to all clients requesting services. A common way to increase the availability is through the replication of the services and their corresponding resources. Often a web farm is used to host multiple replicas of the web application, web services and their resources. Requests are distributed among the replicas. Consistency and durability are often sacrificed to achieve increased availability. The CAP theory [1] [2], stating that distributed database designers can achieve at most two of the properties: consistency (C), availability (A), and partition tolerance (P), has influenced distributed database design in a way that often causes the designer to give up on immediate consistency. In our previous papers we have addressed issues related to increasing availability while still guaranteeing durability and consistency of replicated databases. In this paper we address issues related to maintaining high availability while adding guarantees of correctness by enforcing hierarchical constraints. Traditionally these hierarchical constraints are not enforced by the system due to the expensive run-time cost. In our previous work [3] [4] we provided an extension to the lazy replica update propagation method to reduce the risk of data loss and provide high availability while maintaining consistency. The Buddy System executes a transaction on a primary replica. However, the transaction cannot commit until a secondary replica, “the buddy”, also preserves the effects of the transaction. The rest of the replicas are updated using one of the standard lazy update propagation protocols. The Buddy System provides a guarantee of transactional durability (i.e., effects of the transaction are preserved even if the server, hosting the primary replica crashes before the update can be propagated to the other replicas) and efficient update propagation (i.e., our approach requires the synchronized update between two replicas only, therefore adding minimal overhead to the lazy-replication protocol). The Buddy System uses an application-layer dispatcher [5] to select the buddies based on the data items and the operations of the transactions, the data versions available, and the network characteristics of the WS farm. A limitation of the Buddy System is that integrity constraints that require different classes in the calculation cannot be guaranteed. An example is an address that requires a valid owner in the person class. This integrity constraint cannot be enforced because data mutation can happen on different clusters simultaneously. In this paper we address this limitation. We provide an approach that pulls the Unified Markup Language (UML) constraints expressed in Object Constraint Language (OCL) from the design model. Data is incrementally maintained to allow the dispatcher to enforce the constraint, and, once successful, distribute the requests to several clusters concurrently.

Study on Security of Information Exchange of SOA Application System

Service-oriented architecture (SOA) is a design idea under which we can cover all aspects of the business service in life cycle including the creation and usage of the service. SOA also provides IT infrastructure. It can make the different services exchange data or work is a business process. Implementing the objectives can completely cross operating system platform and cross programming language platform. The objective of the paper is to propose a security service agent based on SOA. The service agent not only can protect the information exchange of network services, but also can realize on different development platforms.

SERVICE ORIENTED ARCHITECTURE GOVERNANCE IMPLEMENTATION IN A SOFTWARE DEVELOPMENT PROJECT AS AN ENTERPRISE SOLUTIONS

In this journal, discussed the way Service Oriented Architecture (SOA) governance applied in a company that is made to meet the business needs related wit h software development projects. The analysis is ba sed on the latest information from the company and the way in which the system implemented based on several methods and also references from existing best prac tice. Various methods used in building this kind of system, however, is used in the design of SOA gover nance that perform overall management within the organization. To analyze the application of SOA, us ed the method of SOA maturity that will be handle i n the application and subsequent assessment.

PLANNING AND DESIGN SOA ARCHITECTURE BLUEPRINT

Service Oriented Architecture (SOA) is a framework for integrating business processes and supporting IT infrastructure as secure, standardized components-services-that can be reused and combined to address changing business priorities. Services are the building blocks of SOA and new applications can be constructed through consuming these services and orchestrating services within a business process. In SOA, services map to the business functions that are identified during business process analysis. Upon a successful implementation of SOA, the enterprise gain benefit by reducing development time, utilizing flexible and responsive application structure, and following dynamic connectivity of application logics between business partners. This paper presents SOA reference architecture blueprint as the building blocks of SOA which is services, service components and flows that together support enterprise business processes and the business goals.Keywords: Service Oriented Architecture, SOA Reference Architecture

Middleware design for high-speed railway integrated dispatching system based on SCA and SDO

In order to solve the system integration problems of high-speed railway integrated dispatching system in highly-distributed,highly heterogeneous environment,system integration framework based on Service Oriented Architecture(SOA) was proposed.The high-speed railway integrated dispatching system structure and its distributed SOA application were constructed based on Service Component Architecture(SCA) and Service Data Object(SDO) technology.The integration of power dispatching subsystem and other scheduling subsystems was achieved based on SCA and SDO technology on Java EE platform.The method fully embodies the openness and cross-platform features of SOA,and it is easy to implement.

The Research and Design of SOA-Based Systems

According to the traditional IT system to integrated the parts and brings much repetition and high cost is insufficient, service oriented architecture is put forward solutions. Further introduces the service oriented architecture theory knowledge, transverse relative to the traditional development advantages, fully demonstrates the main trend of the service oriented architecture that drive. Discusses in detail the service oriented architecture (SOA), the core concept and design principles, and security measures to IBM led the company put forward using the service oriented architecture modeling, and to service the abstract concept to carry on the analysis. The core of service oriented is the component architecture and service data object, combining components and data on the part of the object oriented service principle. And Web services and SOA are compared to further understanding the connotation of SOA, and can support is given based on SOA application system of the specific technology, finally, the paper discusses the SOA further research direction.

Monitoring SOA Applications with SOOM Tools: A Competitive Analysis

Abstract Background: Monitoring systems decouple monitoring functionality from application and infrastructure layers and provide a set of tools that can invoke operations on the application to be monitored. Objectives: Our monitoring system is a powerful yet agile solution that is able to online observe and manipulate SOA (Service-oriented Architecture) applications. The basic monitoring functionality is implemented via lightweight components inserted into SOA frameworks thereby keeping the monitoring impact minimal. Methods/Approach: Our solution is software that hides the complexity of SOA applications being monitored via an architecture where its designated components deal with specific SOA aspects such as distribution and communication. Results: We implement an application-level and end-to-end monitoring with the end user experience in focus. Our tools are connected to a single monitoring system which provides consistent operations, resolves concurrent requests, and abstracts away the underlying mechanisms that cater for the SOA paradigm. Conclusions: Due to its flexible architecture and design our monitoring tools are capable of monitoring SOA application in Cloud environments without significant modifications. In comparisons with related systems we proved that our agile approaches are the areas where our monitoring system excels

SOA investment decision-making using real options analysis

Service-oriented architecture (SOA) is still among the top priorities in IT investment planning. However, selecting proper evaluation methods to capture for flexibility and uncertainty associated with SOA implementations remains a major issue. This paper investigates investment methods and analyses the application of real options models in a particular SOA context. We explore and classify key criteria and embedded options for evaluating multi-stage SOA investments as sequential compound options. The determinants and value drivers for SOA platform acquisition and SOA application development projects are examined and general conclusions with regard to SOA investment decision-making are drawn. In this paper, we identify both the limitations of commonly used techniques as well as the concept’s importance. A visualisation of the analysis is presented through a SOA management decision-framework explaining the relations between the steps of this framework and serving as guidance for SOA investment decision-makers.

Effective Message-Sequence Generation for Testing BPEL Programs

With the popularity of Web Services and Service-Oriented Architecture (SOA), quality assurance of SOA applications, such as testing, has become a research focus. Programs implemented by the Business Process Execution Language for Web Services (WS-BPEL), which can be used to compose partner Web Services into composite Web Services, are one popular kind of SOA applications. The unique features of WS-BPEL programs bring new challenges into testing. A test case for testing a WS-BPEL program is a sequence of messages that can be received by the WS-BPEL program under test. Previous research has not studied the challenges of message-sequence generation induced by unique features of WS-BPEL as a new language. In this paper, we present a novel methodology to generate effective message sequences for testing WS-BPEL programs. To capture the order relationship in a message sequence and the constraints on correlated messages imposed by WS-BPEL's routing mechanism, we model the WS-BPEL program under test as a message-sequence graph (MSG), and generate message sequences based on MSG. We performed experiments for our method and two other techniques with six WS-BPEL programs. The results show that the message sequences generated by using our method can effectively expose faults in the WS-BPEL programs.

A Survey on Service-Oriented Network Virtualization Toward Convergence of Networking and Cloud Computing

The crucial role that networking plays in Cloud computing calls for a holistic vision that allows combined control, management, and optimization of both networking and computing resources in a Cloud environment, which leads to a convergence of networking and Cloud computing. Network virtualization is being adopted in both telecommunications and the Internet as a key attribute for the next generation networking. Virtualization, as a potential enabler of profound changes in both communications and computing domains, is expected to bridge the gap between these two fields. Service-Oriented Architecture (SOA), when applied in network virtualization, enables a Network-as-a-Service (NaaS) paradigm that may greatly facilitate the convergence of networking and Cloud computing. Recently the application of SOA in network virtualization has attracted extensive interest from both academia and industry. Although numerous relevant research works have been published, they are currently scattered across multiple fields in the literature, including telecommunications, computer networking, Web services, and Cloud computing. In this article we present a comprehensive survey on the latest developments in service-oriented network virtualization for supporting Cloud computing, particularly from a perspective of network and Cloud convergence through NaaS. Specifically, we first introduce the SOA principle and review recent research progress on applying SOA to support network virtualization in both telecommunications and the Internet. Then we present a framework of network-Cloud convergence based on service-oriented network virtualization and give a survey on key technologies for realizing NaaS, mainly focusing on state of the art of network service description, discovery, and composition. We also discuss the challenges brought in by network-Cloud convergence to these technologies and research opportunities available in these areas, with a hope to arouse the research community's interest in this emerging interdisciplinary field.

Traceability between service component and class

Service components are the key to the development of a serviceoriented solution as they provide the implementation of the services. The implementation of Service components provides the actual function of the component and can be defined with one or more Java classes. We propose a model named Service Component to Class (SC2C) that maps the service components of an application with that of the classes that implement the service components. We also propose a visual model as a part of SC2C that represents the classes and relationship among classes. This model helps to establish traceability among service components and classes. We also introduce some traceability metrics to measure traceability between the artifacts of Service Oriented Architecture (SOA) and Object Oriented (OO) paradigms. This work, along with our earlier work, help in Software Configuration Management of a SOA application. We provide an insurance system case study to illustrate our approach.

An ontology-based semantic service for cooperative urban equipments

The development of SOA (service oriented architecture) applications is a paradigm to consider for the integration of services which usually requires the incorporation of distributed artificial intelligence technologies or multi agent systems (MAS) to achieve their objectives. This is the case of transportation field, where the improvement of urban data networks and embedded systems allow the implementation of complex distributed services based on intelligent transportation systems. One of the challenges of this kind of systems is the discovery of services. Typically, discovery of services lacks of intelligence, or the result of this process returns a lot of nonsense information. However, the field of transportation requires quick and accurate requests and answers to deal with emergencies or incidents in the traffic flow. For this purpose, this paper proposes the development of a specific service called semantic service (an ontology-based semantic communication service) developed in TAO (The ACE ORB) of CORBA (common object request broker architecture). This service is able to provide a communication support for distributed environment in conjunction with a set of base libraries like Redland (RDF language bindings) for interacting with ontologies written in RDF and RDFS format. A parser Raptor (RDF Syntax Library) is used for analyzing sequences of symbols to determine the grammatical structure, and a syntax query language, Rasqal (RDF Query Library) is used to build and execute queries. Both, Raptor and Rasqal were designed to work with the Redland library. The main objective is to manage ontological information and interoperate with implemented services in embedded urban devices. Obtained results demonstrate the feasibility and effectiveness of the proposed approach.

Application of service oriented architecture to finite element analysis

This paper examines the application of service oriented architecture (SOA) in finite element analysis. SOA is a technology for designing and developing interoperable services. These services can reside on the same computer or, more commonly, on distributed computers. The paper demonstrates how SOA can be used within the context of scientific computing. The implementation and application of SOA to equation solvers and finite element analysis is described. There are advantages in terms of software engineering, as it facilitates the separation of areas of complexity. SOA can be used on standalone computers, intranets and on the internet. The data transfer costs are examined. It is shown that SOA principles can be used to design applets that make use of finite element analysis and a simple example of this is described.

Information Technology Skill Management Strategies for Implementing New Technologies: A Case of Service-Oriented Architecture

Managing human resources and skills for information technology (IT) presents a challenging task for executives, more so when new ITs are involved. Lack of familiarity with the technology, the learning curve associated with its incorporation, and the relative paucity of skilled personnel serve to alter the strategies for management of human resources and skills. This paper presents a system dynamics approach for examining alternative strategies for skill management and supporting decisions during the implementation of service-oriented architecture (SOA) in an organization. For projects involving SOA, the initial planning and implementation of the underlying architecture entail higher costs and slower delivery of initial SOA applications. The use of appropriate IT human resource management strategies for SOA projects is critical for successful SOA implementation. The complexity associated with the fluctuating demand for IT skills, coupled with the need for highly skilled senior architects and professional developers in SOA projects, as well as inevitable delays in skill acquisition, makes this a challenging task. This paper examines the impact of alternative staffing strategies under various environmental conditions and provides guidance for staffing decisions. Using a design science methodology, it employs system dynamics as a vehicle for allowing human resource managers to examine the impact of alternative staffing strategies under a variety of environmental conditions.

Adaptive Enterprise Service Bus

Modern software systems are usually designed in the Service-Oriented Architecture (SOA), which provides methods for system development and integration of existing, reusable services. Due to the growing com-plexity of such systems, there is a need to design them in a way which enables adaptation to changes in the execution environment. This paper presents the Adaptive ESB framework for adaptive execution of services with the use of statistical models representing knowledge about service execution. Statisti- cal models are exploited in many different areas, but applying them to SOA applications requires specific methods for their identification, updating and processing. A statistical model of service execution represents knowledge of how a complex system behaves as a high-level abstraction of a system related to the problem space.

A Systematic Input Selection for Service Identification in SMEs

Service-oriented Architecture (SOA) as an ideal architecture to support today’s business challenges such as agility and flexibility acts like a bridge between IT and business domains. There are intensified SOA applications at large enterprises. However, small and medium enterprises cannot obtain SOA benefits due to the lack of compatible solutions of SOA implementation challenges. Service identification is the first step in service modeling that extracts services as building blocks of SOA. Determining suitable inputs for SME service identification based on their conditions is a key factor for developing related identification method. This paper proposes SME based criteria to evaluate current inputs of service identification. To assess the inputs that are collected from variety of sources a mapping process between enterprise goals and collected inputs is presented.