Service Oriented Architecture(SOA).

Krishna Bakka2/25/2016.

OUTLINE:Understanding SOA

Implementing SOA

Current methodologies in SOA

Understanding Service oriented software

Design(SOA)

Service oriented architecture is one of the modern software architectural techniques.

SOA is composed of loosely coupled and flexible software components called services.

Supports:UsabilityScalabilityFlexibility

SOA is a paradigm shift.

The key abstraction is that of services.

Used to support rapid and low-cost application development through service composition.

How SOA works [4]

What is a service?Every organization has set of services like

cleaning, customer, R&D service etc. All must communicate effectively to run the

organization. A service is an operation that may be

discretely invoked. A service is a self-contained unit of

functionality like Retrieving an online bank statement.

Types of services[2]

Characteristics of services:Loosely coupled Defined by a contractAbstract Reusable Composable Stateless

Enterprise service bus Technical backbone of a SOA landscape. Metadata of services can be made accessible

through the ESB.Provides a registry of service.ESB provides means for connecting services

with each other. Provide interoperability between

heterogeneous systems.

Roles of ESB: RoutingDealing with securityDealing with reliabilityService managementMonitoring and logging

Overview of SOA[6]

Goals and Benefits of SOAGoals: Benefits:

Increased intrinsic interoperability.

Increased federation. Increased business and

technology alignment.

Increased return on investment.

Increased organizational agility.

Reduced IT burden.

Implementation

Implementation of SOA:

Existing methodologies

IBM Service-Oriented Analysis and Design(SOAD):It is an extension of existing models like

OOAD, Enterprise modeling and business process models.

It strictly suggests to use the concepts from OOAD, EM and BPM and extend using service abstraction.

Key elements are:Service categorization and aggregationPolicies and aspectsService harvestingMeet-in-the-middle process

SOA Repeatable quality(RQ):Proprietary methodology of sun

microsystems.It is a iterative and incremental type of

process.Consists of five phases:

InceptionElaborationConstructionTransitionConception

CBDI-SAE process:Four key areas of the process:

ConsumeProvideManageEnable

Each area again groups similar process units and tasks

Business and IT integration through top down analysis and bottom up legacy system integration.

References:1. Ramollari, E., Dranidis, D., Simons, A,J,H., A Survey of

Service Oriented Development Methodologies, The second European Young researchers workshop on service oriented computing, University of Leicester, UK, 2007.

2. Waris,M., Khan,S,A.,Fakhar,M,Z., Factors effecting Service oriented architecture implementation, science and information conference, London, October,2013.

3. W. Vegter, “Critical success factors for a SOA implementation”, 11th Twente Student Conference on IT, Enschede, University of Twente, Faculty of Electrical Engineering, Mathematics and Computer Science, June 29th, 2009.

4. Petrenko, A.I.: Service-oriented computing (SOC) in engineering design. In: Third International Conference on High Performance Computing HPC-UA (2013).

5. https://techcarvings.wordpress.com/2014/08/page/3/

6. http://www.brunasti.eu/unimib/bdsi/appunti-2011/BDSI-Appunti-lez-07-2011-v2.pdf