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Adapter
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Broker (Appl. Server/ ESB)
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Two faces of an adapter
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It is common that a fairly complex package application can be accessed by various interfaces. An adapter is not limited to supporting only one interface per package application; rather, it can bundle different interfaces of the same package application. This can be achieved by configuring the adapter with the description of the exchanged data and the interface type to be used with the EIS/package application (see Figure 10.4). This information is stored in configuration files and enables the adapter to cope with EIS-specific application data of various data types and access mechanisms during runtime. In addition to performing data transformations, another characteristic of an adapter is that it may run in its own process. Therefore, the integration broker does not have to access the EIS/package application directly, thus resulting in the decoupling of the availability of the broker for other applications. This decoupling also means that the EIS/package application can be accessed without making any modifications. Because the adapter runs in its own process, it can support bidirectional communication between the integration broker and the package application, as shown in Figures 10.5 and 10.6. In the case where the data
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Adapter Type Description of EIS Specific Data TRANSFORM EIS Specific Data of Various Types Data in Integration Broker Format
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Data transformation driven by the type description within an adapter
INTERFACE
Package Application
Adapter
Broker (Appl. Server/ ESB)
Request processing
Integrating Package Applications
Package Application Broker (Appl. Server/ ESB)
Adapter Event Store
Event processing
gets forwarded to the package application from the integration broker, the scenario is called request processing or outbound processing. Request processing is usually based on the existing interfaces of the package application. These existing interfaces are called directly by the adapter. In the second case, the events are generated independently in the package application, which are forwarded to the integration broker by the adapter for processing. This second scenario is called event processing. If the EIS/package application cannot be configured to submit events to an external component directly, special functionality must be introduced that enables an adapter to retrieve or pull the event by itself. Normally, this is done using an Event Store in the EIS, which buffers the events and extends the adapter via a mechanism for detecting (and pulling) the events stored there. J2EE Connector Architecture (JCA) Before the introduction of J2EE Connector Architecture (JCA), for each combination of application server (broker) and EIS (package application), a different adapter was needed. For example, three separate adapters were needed to integrate an SAP application with WebSphere Application Server, JBoss Application Server, and WebLogic Application Server, as shown in Figure 10.7. This led to a proliferation of adapters and made the integration of package applications with modern applications very complex and cumbersome. JCA simplified the integration of package applications by defining a standard interface to an application server/broker. This standard interface means that the EIS vendor has to provide only a single adapter to integrate their package application with a number of different application servers, each of which is JCA compliant. Thus, for example, SAP has to provide a single adapter that will integrate an SAP application with modern applications running on any application server that supports JCA.
Ten
Package Application (e.g. SAP)
Adapter 1
WebSphere Application Server
Package Application (e.g. SAP)
Adapter 2
JBoss Application Server
Package Application (e.g. SAP)
Adapter 3
WebLogic Application Server
Figure 10.7 Integration of a package application without the use of JCA. Note three different adapters are needed, one for each brand of application server.
This is illustrated in Figure 10.8, which shows that the same adapter can be used with any of the three brands of application server (namely, WebSphere Application Server, JBoss Application Server, and WebLogic Application Server), in contrast to the situation shown in Figure 10.7, where three different adapters are needed. Multiple resource adapters (that is, one resource adapter per type of EIS) can be plugged into an application server. This capability enables application components deployed on the application server to access a number of the underlying EISs. To achieve a standard system-level pluggability between application servers and EISs, the JCA defines a standard set of system-level contracts between an application server and the EIS. The adapter implements the EIS side of these system-level contracts. The adapter usually runs in the address space of the application server. An adapter is a system-level software driver used by an application server or an application client to connect to an EIS. By plugging into an application server, the adapter collaborates with the server to provide the underlying mechanisms, the transactions, security, and connectionpooling mechanisms. JCA defines three system-level contracts between the application server and the EIS: one for outbound connectivity, one for inbound connectivity, and one for life cycle and thread management. We first discuss the JCA-defined system-level contract for outbound connectivity.
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