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SYSTEM ORIENTED ARCHITECTURE(SOA)

SOA INTRODUCTIONSOA DEFINITIONSOA ARCHITECUTRESOA SERVICESSOA CONNECTIONSSOA USING JAVA WEB SERVICESSOA IN COMPUTINGSOA REQUIREMENTSSOA PRINCIPLESSOA ARCHITECTURAL PRINCIPLESSOA IMPLEMENTATIONWHAT IS CLOUD COMPUTING IN SOASOA AND TRADITIONAL ARCHITECTURE DIAGRAMSOA LIFE CYCLESOME OF THE RELATED EXAMPLES OF SOA

TOPICS

•The combination of Web Services and SOAs resolves the issues of CORBA and DCOM approaches to SOAs.

• Now Web services have removed another barrier by allowing applications to interconnect in an object-model-neutral way. •For example, using a simple XML-based messaging scheme, Java applications can invoke Microsoft .NET applications or CORBA-compliant, or even COBOL, applications

SOA Introduction

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SOA DEFINITION

A service-oriented architecture is essentially a collection of services. These services communicate with each other.

The communication can involve either simple data passing or it could involve two or more services coordinating some activity. Some means of connecting services to each other is needed.

Service-oriented architectures are not a new thing. The first service-oriented architecture for many people in the past was with the use DCOM or Object Request Brokers (ORBs) based on the CORBA specification

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•Service Oriented Architecture is an umbrella term very similar to that other umbrella term, “web services”.

• SOA refers more to how these web services interact, however, in a system.

• Below is a diagram I’ve knocked up which shows in a very crude fashion the difference between traditional models and SOA.

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SOA ARCHITECTURE

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SOA SERVICES

If a service-oriented architecture is to be effective, we need a clear understanding of the term service.

A service is a function that is well-defined, self-contained, and does not depend on the context or state of other services

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SOA CONNECTIONS

◙The technology of Web services (new window) is the most likely connection technology of service-oriented architectures. ◙Web services essentially use XML (new window) to create

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◙The following figure illustrates a basic service-oriented architecture. It shows a service consumer at the right sending a service request message to a service provider at the left.

◙ The service provider returns a response message to the service consumer.

◙ The request and subsequent response connections are defined in some way that is understandable to both the service consumer and service provider.

◙A service provider can also be a service consumer.

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SOA USING JAVA WEB SERVICES

◙ Java became a powerful development platform for Service-Oriented Architecture (SOA) in 2006. Java EE 5, released in May 2006, significantly enhanced the power and usability of the Web Services capabilities on the application server.

◙ Then Java SE 6, released in December 2006, incorporated the majority of those capabilities into the standard edition of the Java programming language.

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◙Because robust Web Services technology is the foundation for implementing SOA, Java now provides the tools modern enterprises require to integrate their Java applications into SOA infrastructures.

◙Of course, Java has had basic Web Services capabilities for some time. JAX-RPC 1.0 was released in June 2002. J2EE 1.4, finalized in November 2003, included JAX-RPC 1.1.

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In computing, service-oriented architecture (SOA) provides a set of principles of governing concepts used during phases of systems development and integration. Such an architecture will package functionality as interoperable services: functions provided as a service are available to be used from systems created by other organizations.

A system implemented using the theory contained in this article is called a Service Oriented Architecture implementation

SOA IN COMPUTING

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It is an attempt to develop yet another means for applications to exchange data. Service-orientation requires loose coupling of services with operating systems, and other technologies that underlie applications. SOA separates functions into distinct units, or services, which developers make accessible over a network in order that users can combine and reuse them in the production of applications.

These services communicate with each other by passing data from one service to another, or by coordinating an activity between two or more services.

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Requirements

In order to efficiently use a SOA, one must[citation needed] meet the following requirements:

Interoperability between different systems and programming languages provides the basis for integration between applications on different platforms through a communication protocol. One example of such communication is based on the concept of messages.

Using messages across defined message channels decreases the complexity of the end application, thereby allowing the developer of the application to focus on true application functionality instead of the intricate needs of a communication protocol.

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Desire to create a federation of resources. Establish and maintain data flow to a federated data warehouse. This allows new functionality developed to reference a common business format for each data element.

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Principles

The following guiding principles define the ground rules for development, maintenance, and usage of the SOA:

Reuse, granularity, modularity, composability, componentization and interoperability

Standards compliance (both common and industry-specific)

Services identification and categorization, provisioning and delivery, and monitoring and tracking

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SOA ARCHITECTURAL PRINCIPALS

oThe following specific architectural principles for design and service definition focus on specific themes that influence the intrinsic behaviour of a system and the style of its design:

oService encapsulation – Many web services are consolidated to be used under the SOA. Often such services were not planned to be under SOA.

oService loose coupling – Services maintain a relationship that minimizes dependencies and only requires that they maintain an awareness of each other oService contract – Services adhere to a communications agreement, as defined collectively by one or more service description documents

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oService composability – Collections of services can be coordinated and assembled to form composite services oService autonomy – Services have control over the logic they encapsulate oService optimization – All else equal, high-quality services are generally considered preferable to low-quality ones oService discoverability – Services are designed to be outwardly descriptive so that they can be found and assessed via available discovery mechanisms

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oService reusability – Logic is divided into services with the intention of promoting reuse

oService Relevance – Functionality is presented at a granularity recognized by the user as a meaningful service

oService abstraction – Beyond what is described in the service contract, services hide logic from the outside world

SOA IMPLEMENTATION

»The following references provide additional considerations for defining a SOA implementation:

»SOA Reference Architecture provides a working design of an enterprise-wide SOA implementation with detailed architecture diagrams, component descriptions, detailed requirements, design patterns, opinions about standards, patterns on regulation compliance, standards templates etc.

»Life cycle management SOA Practitioners Guide Part 3: Introduction to Services Lifecycle introduces the Services Lifecycle and provides a detailed process for services management though the service lifecycle, from inception to retirement or repurposing of the services. It also contains an appendix that includes organization and governance best practices, templates, comments on key SOA standards, and recommended links for more information

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What is cloud computing in SOA?This isn’t another quick-start guide to cloud computing and

Service-Oriented Architecture (though you can follow that link to get to one); it’s an investigation into what people are searching for on Google.

So what are the top terms for Cloud computing? It’s no surprise that “what is cloud computing?” is near the top of the list. Braving Google’s wrath by my apparent keyword spamming, here they are:

cloud computingibm cloud computingwhat is cloud computingmicrosoft cloud computing

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TRADITIONAL ARCHITECTURE DIAGRAM AND SOA DIAGRAM

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SOA LIFE CYCLE

After establishing an architecture baseline based on the SOA reference architecture, practitioners should review the services lifecycle.

This section briefly describes the service lifecycle and identifies the actors, potential tools, and artifacts associated with each stage of its stages.

This document does not cover all the cultural, governance, and organizations changes required to make SOA a success; instead, it focuses on defining best practices for the services lifecycle.

The services lifecycle is part of the execution stage in the SOA lifecycle diagram below.

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SOME OF THE REALTED EXAMPLES OF SOA

EXAMPLE OF SOA DERIVATIVE PATTERNS PEER TO PEER

EXAMPLE OF SOA

EXAMPLE OF SOA DERIVATIVE PATTERNS INTERMEDIARY

EXAMPLE OF SOA DERIVATIVE PATTERNS ONE WAY MESSAGE

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