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such an ESB for integrating mainframe applications, the mainframe applications typically have to be exposed as Web Services first using one of the point-to-point techniques described earlier. The second type of ESB is based on the messaging software. The prime example of such an ESB is the IBM WebSphere Message Broker (WMB), which is based on the WebSphere MQ messaging software from IBM. This type of ESB is much more scalable in terms of transaction volume. Also, a more diverse set of applications can be integrated with the mainframe applications via these ESBs. These ESBs can also be used to guarantee delivery of messages between the service consumer and service provider. In order to use this kind of ESB, it is necessary to expose the mainframe application first, either as a Web Service or a messaging-based service using one of the methods described earlier for point-to-point integration.
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In addition to mainframe applications, which form the backbone of IT systems of large enterprises, the IT system of a large organization typically has a number of package applications. Examples of such package applications include Customer Relationship Management (CRM) applications and Enterprise Resource Planning (ERP) applications. SAP, PeopleSoft, Oracle, and JD Edwards are some of the software suppliers for these types of applications. Some of the advantages of these package applications for large organizations include risk reduction, introduction of best practices and processes, speed of implementation, and more accurate estimation of the cost of the software. Frequently these package applications are also referred to as Enterprise Information Systems (EISs). For such large organizations it is also important to integrate these package applications with the other applications in the IT systems in order to provide a consistent and unified view of data and functionality to both the internal and external customers. Most, if not all, of the schemes for integrating these package applications rely on the use of adapters. Adapters are simply software components or subsystems that allow package applications to talk to other applications using the interfaces provided by the package applications. Modern ways of integrating these applications use adapters in conjunction with a J2EE application server to connect the EIS with the modern applications. Alternatively, the adapters can be used with an Enterprise Service Bus (ESB) to integrate the EIS with a wider variety of applications. (Many times in this chapter we will refer to application servers and Enterprise Service Buses as brokers because these application servers and ESBs can mediate between different applications.) In addition, sometimes the EIS supplier provides an infrastructure to expose some of the functionality and data embedded in the EIS application as Web Services. For example, such is
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the case for SAP by integrating an application server with their EIS. The first two options are shown schematically in Figures 10.1 and 10.2. In general, the adapter can be deployed either at the EIS side or the application server/ESB side, or somewhere in between. However, most commonly the adapter is deployed at the application server or ESB side. We will discuss adapters in some detail in the following sections.
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adapter
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J2EE Application
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Integrating Package Applications
The remaining sections of the chapter are organized as follows: First, we describe the adapter and integration of package applications in general. J2EE Connector Architecture (JCA) is discussed next. Compliance with JCA reduces the number of adapters needed for a given package application by a large factor. Following this we illustrate the use of adapters by considering a specific package, namely SAP applications. We describe the SAP system and the various interfaces exposed by the SAP system, and then we describe the WebSphere adapter for the SAP system. Finally, integrating package applications by exposing their functionality as Web Services is briefly discussed. Adapters In general, an EIS adapter is specific to an EIS and an integration point (broker), such as a specific application server or a specific ESB. Examples of application servers include WebSphere Application Server (WAS) and JBoss Application Server. Examples of an ESB include WebSphere Enterprise Service Bus (WESB) and WebSphere Message Broker. Examples of an EIS include SAP s ERP and CRM applications. Therefore, in general, each combination of an EIS and the integration point (broker) requires a separate adapter. An EIS-specific adapter contains two outlets (that is, interfaces), as shown in Figure 10.3: one interfacing with the respective EIS and one interfacing with the integration broker. The outlet to the EIS understands its given application interface. The outlet to the integration broker supports the interface of the integration broker. In this way, the adapter is an abstraction layer and shields the integration broker from the peculiarities of an EIS. The integration broker must understand only one protocol and one data format when communicating with the adapters.
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