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Integration of a package application with the use of JCA. Note that only one adapter is needed, which can be used with any number of brands of application servers.
JCA s Contract for Outbound Connectivity
The J2EE Connector Architecture defines the following system-level contracts between the EIS and the application server:
Connection management contract This type of contract lets an application server pool connections to an underlying EIS, and lets application components connect to an EIS. This leads to a scalable application environment that can support a large number of clients requiring access to EISs. Transaction management contract This is a contract between the transaction manager and an EIS that supports transactional access to EIS resource managers. This contract lets an application server use a transaction manager to manage transactions across multiple resource managers. This contract also supports transactions that are managed internally to an EIS resource manager without the need to involve an external transaction manager. Security contract This type of contract enables secure access to an EIS. This contract provides support for a secure application environment, which reduces security threats to the EIS and protects valuable information resources managed by the EIS.
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JCA s Contract for Inbound Connectivity
JCA also defines the following system-level contracts for inbound connectivity (with respect to the application server) between the EIS and the application server:
Transaction in ow contract This type of contract allows a resource adapter to propagate an imported transaction to an application server. This contract also allows a resource adapter to ow in transaction-completion and crash-recovery calls initiated by an EIS, and ensures that the ACID properties of the imported transaction are preserved. Message in ow contract This type of contract allows a resource adapter to asynchronously deliver messages to message end points residing in the application server independent of the speci c messaging style, messaging semantics, and messaging infrastructure used to deliver messages. This contract also serves as the standard message provider pluggability contract that allows a wide range of message providers Java Message Service (JMS), Java API for XML Messaging (JAXM), and so on to be plugged into any J2EE technology compatible application server via a resource adapter.
JCA s Life Cycle and Thread Management Contract
The following system-level contracts defined by JCA relate to the adapter s life cycle management and thread management:
Life cycle management contract This type of contract allows an application server to manage the life cycle of an adapter. This contract provides a mechanism for the application server to bootstrap an adapter instance during its deployment or application server startup, and to notify the adapter instance during its undeployment or during an orderly shutdown of the application server. Work management contract This type of contract allows an adapter to do work (monitor network end points, call application components, and so on) by submitting work instances to an application server for execution. The application server dispatches threads to execute submitted work instances. This allows an adapter to avoid creating or managing threads directly, provides a mechanism for an adapter to do its work, and allows an application server to ef ciently pool threads and have more control over its runtime environment. The adapter can control the security context and transaction context with which work instances are executed.
Integrating Package Applications
In the next two sections, we consider the WebSphere brand adapter for integrating a specific package application. WebSphere adapters are available for a wide range of package applications. Because these adapters are JCA compliant, they can be used to integrate with any brand of application server or enterprise bus. We start with a brief introduction to SAP and the various interfaces that can be used for integration. Then we cover the WebSphere adapter for SAP integration. Introduction to SAP and Its Interfaces SAP implements a three-tier architecture that includes a back-end database, which can be a database from any of the major database software suppliers. The middle tier consists of application server instances. These instances distribute the workload. The front end uses a specific fat client SAP graphical user interface (SAPGUI) to access the backend system. The more recent SAP releases also support web browsers as a front end. Earlier releases of SAP business applications were packaged in modules, which were written in Advanced Business Application Programming (ABAP) and ran on the SAP application server. More recent releases, such mySAP.com, have extended support for additional Internet technologies. The new SAP Web Application Server includes the full functionality of a J2EE application server. The new SAP NetWeaver is the current technology platform that supports business applications on both technology stacks: ABAP and Java. SAP applications integration must support the various releases of SAP enterprise engine as well as various interfaces, including the following:
Application Link Enabling (ALE) and Intermediate Documents (IDocs) Remote Function Call (RFC) Business Application Programming Interface (BAPI) Batch Data Communications (BDC) Electronic Data Interface (EDI) Web Services (SAP Web Application Server 6.20 and later)
Note that the BDC and EDI interfaces are beyond the scope of this chapter, and the last option exposes only some of the functionality as Web Services. We will not elaborate on this interface because its use is straightforward.
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