Best SOA Training In Adyar Chennai With Placement
Service Oriented Architecture or SOA Training In Chennai it can be explained as a collection of many services in a network which communicate with each other and this involves data exchange with service coordination and SOA is used for the development of loosely coupled distributed applications.
Though earlier the concept of SOA was based on DCOM or Object Request Brokers (ORBs) but nowadays SOA is based predominantly on Web Services. SOA is also a flexible and standardized architecture which focuses business-centric approach that supports integrating business as repeatable tasks or linked services to design and develop flexible IT solutions which enable business process components to be orchestrated and assembled in a more efficient manner to deliver distinctive business capabilities and services for high performance. It unifies business processes by structuring large applications as an ad-hoc collection of smaller modules called services.
Here its worth explaining the term Service. A service is nothing but a function or some processing logic or business processing that is well-defined, self-contained, and does not depend on the context or state of other services.
Example of Services are Loan Processing Services, booking a flight tichet online etc which can be self-contained unit for process the Loan Applications or could be Weather Services, which can be used to get the weather information. Any application on the network can use the service of the Weather Service to get the weather information and SOAs build applications out of such services.
Instead of services embedding calls to each other in their source code, there are protocols defined which describe how one or more services can talk to each other. This architecture then relies on a business process expert to link and sequence services, in a process known as orchestration, to meet a new or existing business system requirement.
XML is used extensively in SOA to create data which is wrapped in a nearly exhaustive description container. In the communication process with services data exchange are typically described by WSDL, and communications protocols by SOAP, discovery and publishing by UDDI and data representation by XML.
In a SOA environment independent services can be accessed without knowledge of their underlying platform implementation.
Interoperability between different systems and programming languages is the key for integration between applications on different platforms through a communication protocol.
One example of such communication is based on the concept of messages. Each SOA building block can play one or more of the three main roles of Service Requester, Service Broker and Service Provider.
Interoperability, Compliance to standards (both common and industry-specific), reusability, modularity, composability, componentization, Services identification and categorization and monitoring and tracking are some of the guiding principles which forms the ground rules for development, usage and maintenance of SOA.
The deployment of a SOA requires the conversion of existing systems into services. The tasks involved in achieving this can be repeated for each system and a common set of components may be needed to provide additional functionality (such as security and auditing).
An Enterprise Service Bus (ESB) helps in converting existing systems into services. This ESB generally provides an abstraction layer on top of an implementation of an enterprise messaging system, which allows integration architects to exploit the value of messaging without writing code. Using ESB, an application can communicate via the bus, which acts as a message broker between applications. The primary advantage of such an approach is that it reduces the number of point-to-point connections required to allow applications to communicate.
With the increasing demand for SOA and with the increasing momentum of Web 2.0 which is called “second generation” of web sites, together they can add lot of value in enterprise computing in the coming years as Gartner predicted the SOA business with grow to $50 billion in next 5 years.
Web 2.0 will leverage the next generation sites with collaboration and sharing in terms of Social Networking as part of Semantic Web. Hence, Web 2.0 applications will extensively use Web services and may include Ajax, Flash, or JavaFX user interfaces, Web syndication, blogs, and wikis.
With increasing demands businesses use SOA and Web 2.0 to reach new markets, with improved efficiency, in a faster time to market, with lower TCO and other advantages. I will keep you posted with the changes in and around SOA in the coming days.
SOA stands for service oriented architecture. From OOA to SOA, computing and development approach of software services are changing rapidly.
SOA are based on a mesh of software services. Services comprise unassociated, loosely coupled units of functionality that have no calls to each other embedded in them. Each service implements one action, such as filling out an online application for an account, viewing an online bank-statement, or placing an online booking or airline ticket order. Instead of services embedding calls to each other in their source code they use defined protocols that describe how services pass and parse messages, using description meta-data.
The developer associates individual SOA objects by using orchestration. In the process of orchestration the developer associates software functionality (the services) in a non-hierarchical arrangement (in contrast to a class hierarchy) using a software tool that contains a complete list of all available services, their characteristics, and the means to build an application utilizing these sources.
Underlying and enabling all of this requires meta data in sufficient detail to describe not only the characteristics of these services, but also the data that drives them. Programmers have made extensive use of XML in SOA to structure data that they wrap in a nearly exhaustive description-container. Analogously, WSDL typically describe the services themselves, while SOAP describes the communications protocols. Whether these description languages are the best possible for the job, and whether they will remain the favorites in the future, remains an open question. In the meantime SOA depends on data and services that are described metadata that should meet the following two criteria:
- the metadata should come in a form that software systems can use to configure dynamically by discovery and incorporation of defined services, and also to maintain coherence and integrity
- the metadata should come in a form that system designers can understand and manage with a reasonable expenditure of cost and effort
Service Oriented Architecture or SOA for short is a new architecture for the development of loosely coupled distributed applications. In fact service-oriented architecture is collection of many services in the network. These services communicate with each other and the communications involves data exchange & even service coordination. Earlier SOA was based on the DCOM or Object Request Brokers (ORBs). Nowadays SOA is based on the Web Services.Broadly SOA can be classified into two terms: Services and Connections
A service is a function or some processing logic or business processing that is well-defined, self-contained, and does not depend on the context or state of other services. Example of Services are Loan Processing Services, which can be self-contained unit for process the Loan Applications. Other example may be Weather Services, which can be used to get the weather information. Any application on the network can use the service of the Weather Service to get the weather information.
Connections means the link connecting these self-contained distributed services with each other, it enable client to Services communications. In case of Web services SOAP over HTTP is used to communicate the between services.
The following figure is a typical example of the service-oriented architecture. It shows how a service consumer sends a service request to a service provider. After accepting the request, service provider send a message to the service consumer. In this case a service provider can also be a service consumer.Connections means the link connecting these self-contained distributed services with each other, it enable client to Services communications. In case of Web services SOAP over HTTP is used to communicate the between services
The following figure is a typical example of the service-oriented architecture. It shows how a service consumer sends a service request to a service provider. After accepting the request, service provider send a message to the service consumer. In this case a service provider can also be a service consumer.
Different Technologies Used:
SOA is much different from point-to-point architectures. SOA comprise loosely coupled, highly interoperable application services. These services can be developed in different development technologies (such as Java, .NET, C++, PERL, PHP), the software components become very reusable i.e. the same C# (C Sharp) service may be used by a Java application and / or any other programming language. WSDL defines an standard, which encapsulates / hides the vendor / language specific implementation from the calling client / service TermDefinition / Commentservice(Ideally) a self-contained, stateless business function which accepts one or more requests and returns one or more responses through a well-defined, standard interface. Services can also perform discrete units of work such as editing and processing a transaction. Services should not depend on the state of other functions or processes. The technology used to provide the service, such as a programming language, does not form part of this definition.orchestrationSequencing services and providing additional logic to process data. Does not include data presentation.statelessNot depending on any pre-existing condition. In a SOA, services should not depend on the condition of any other service. They receive all information needed to provide a response from the request. Given the statelessness of services, service consumers can sequence (orchestrate) them into numerous flows (sometimes referred to as pipelines) to perform application logic.providerThe function which performs a service in response to a request from a consumer.consumerThe function which consumes the result of a service supplied by a provider.discoveryService oriented architecture relies on the ability to identify services and their capabilities. Therefore, a SOA depends on a directory which describes the services available in its domain.bindingThe relationship between a service provider and consumer is dynamic; it is established at runtime by a binding mechanism.
SOA architecture enables seamless Enterprise Information Integration. Here are some of the Benefits of the Service Oriented Architecture:
Due to its platform independence, it allows companies to use the software and hardware of their choice .
There is no threat of vendor lock-in
SOA enables incremental development, deployment, and maintenance.
Companies can use the existing software (investments) and use SOA to build applications without replacing existing applications
The training costs are low, so the available labor pool can be used for running the applications