Java Connector Architecture: Building Enterprise Adaptors

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  1. Introduction to the J2EE Connector Architecture
  2. Product details
  3. Java Connector Architecture
  4. Connector Architecture - The Java EE 5 Tutorial

It should. Otherwise you will end up in a big mess by creating your own unconventional way of doing stuff which beat the purpose of following Java EE specification in the first place.

Design your message-driven beans to delegate business processing to other enterprise beans. Do not access the EIS resources directly in the message-driven bean, but do so indirectly through a delegate bean. Remarks Let's clarify some terminologies first: Outbound Messaging is where the message starts from the server to be more accurate it's initiated from your app which you have on the server, WebSphere Liberty in this case and end at the EIS. Inbound Messaging is where message starts from the EIS and end at the server. What does it mean activating a MessageEndPoint?

Does MessageEndPoint need to be a bean? Check the second resource I'm mentioning below for a helpful example.

Introduction to the J2EE Connector Architecture

Useful learning resources: Managing messages with message endpoints Develop inbound connectors. Previous Next. This is true, and the actual data can be grouped in one or more application-specific header blocks and body blocks. As a result, a SOAP message may include information that is not intended for the actual processing by the target application.

  • J2EE Connector Architecture(JCA), An Introduction.
  • Introduction to Java Connector Architecture.
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  • Java™ Connector Architecture: Building Custom Connectors and Adapters [Book].

Each data block in the header can be targeted at different SOAP processors, who may assume different roles as defined by the actor attribute of each block. The body section does not have any actor attributes, ensuring that the final target SOAP processor must process the body section per the defined name space. There is obviously much more to SOAP than we can cover in this chapter. However, the basic structure of a SOAP message and some of its capabilities in terms of supporting multistep processing of messages are important to the concept of Internet-enabled Web Services.

Universal Description, Discovery, and Integration UDDI A central piece of any online service infrastructure is a directory that stores the definition of all available services, enabling users to query the availability of the services before interacting with the specific service implementations.

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UDDI enables users to publish their services and business information, which is stored in a central repository. Referring to Figure 6. The businessEntity data type is useful for getting more details on the service provider company —for example, when more than one service provider is capable of providing the same or similar services. You may have a preference for one service provider over others.

The bindingTemplate data type provides information on the location of the service. In some respects, the bindingTemplate provides a more technical version of the service description than is provided by businessService data type. Together, these two data types help describe the service. Together, the four data types form the registration information in a UDDI repository.

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The businessEntity data type is mandatory, and every Web Service is required to provide information about the service provider. Other data types are optional. These APIs enable businesses to maintain their business and service information, and also search for appropriate Web Services. WSDL is one such example of a general-purpose service description language.

WSDL complements UDDI, and provides a uniform mechanism for describing abstract service interfaces and specific protocol bindings that support the service. All these technologies prove that XML has real potential in integrating crossplatform applications built with different programming languages. Doing so is not easy, and requires you to learn many new technologies, but the end result of integrating the applications is worth the effort.

Which of the two is better than the other depends on the integration scenario, the supporting infrastructure, and the available tools. When should you develop a Web Service, and when should you develop a resource adapter? Its usefulness will be determined by what role it plays in the context of J2EE applications. J2EE is an application platform, and its components are mostly designed as part of a J2EE application.

External service-oriented access to the J2EE application is thought to be more of a portal server job. The possibilities are many, but the real issue is where and how Web Services fit in the Java application context.

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Adapters and Web Services Working Together As complementary technologies, adapters and Web Services can work together to implement complex integration scenarios. Adapters can take on the role of data synchronization, whereas Web Services will enable application functions to interact with each other. A Web Service may need to integrate with other applications to fulfill its service contract. A user event can be a purchase order or an online bill payment, for example. User events can also be generated by applications such as a customer service application requiring an account status check from the accounting system.

Java Connector Architecture

Web Services are an ideal mechanism for implementing a universally accessible application function service. These state changes trigger an adapter to add the new customer record or update the customer record in all other applications that keep their own copies of customer data. Data synchronization is one of the primary objectives of resource adapters.

But adapters do more than data synchronization, and many times they support distributed transactions. This is the area in which there is potential for an overlap between Web Services and adapters.

Connector Architecture - The Java EE 5 Tutorial

It may be better to define an implementation strategy in terms of when to use an adapter and when to use a Web Service. NET applications and other clients. In both these scenarios, a resource adapter is required. In this implementation strategy, Web Services become 77 78 CHAPTER 6 Introduction to Web Services the interface between the company and its customers, partners, and suppliers; whereas the resource adapters become integration components tying up different EISs inside the company.

This is just one potential implementation pattern in which Web Services and resource adapters can coexist. Another potential integration pattern in which Web Services and resource adapters are required to collaborate is in business process integration. Applications that are part of a specific business process will have to expose the required processes functions , and Web Services are ideal for that purpose. When the applications need to integrate with other EISs to fulfill their part in the business process, they will use resource adapters.

It is left to the application server vendors to provide the additional SOAP server functionality in their application servers. Summary The hype surrounding Web Services makes it very hard to ignore this emerging technology. Experienced software developers should study the details of Web Services, and differentiate between the hype and practical uses of Web Services. Already, some of the EAI vendors are downplaying the potential effectiveness of Web Services and their role in application integration. However, Web Services do bring some simplicity to integration solutions. By using an integration protocol based on XML and focusing on application services instead of data, Web Services enable more sophisticated integration patterns.

Interapplication collaborations are easier with Web Services. It is possible that in the near future, applications will invoke application services across the Internet, both inside and outside the firewall. This may sound similar to EDI and its objectives in integrating intercompany processes. However, EDI is a point-to-point data exchange solution, and Web Services are more dynamic service-based application-collaboration solutions.

Web Services pose a challenge to the long-term effectiveness of Java Connector Architecture. But every challenge is Summary an opportunity, and perhaps the emergence of Web Services will give JCA a more focused objective and role in application integration.

After all, JCA is a standard only in the realm of J2EE application servers; and although J2EE is the primary platform for Internet applications today, it will likely face stiff competition from. NET initiatives. In the meantime, Web Services and resource adapters can and will coexist to solve the application-integration problem. This dependency on integration of business processes and resources drives the need for integrated business applications.

New functions typically include Web enabling legacy applications and adding integration capabilities. Typically, deploying third-party packages involves data migration issues, customization issues, and integration with existing business applications. In each of these scenarios, the need to integrate business applications is driven not just by the technical requirements; it is mainly the business requirements that drive the software development projects.

Application integration has become part of mainstream software development, and it is essential to include integration as a primary objective when planning and managing software projects. Do we need a new methodology for handling the inclusion of integration requirements and adapter development?

Not unless software development is managed without a methodology in the first place.