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6: Legacy Connectivity
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The JCA enables a vendor to provide a standard resource adapter for its EIS. The resource adapter is integrated with the application server, thereby providing connectivity between the EIS and the enterprise application. An EIS vendor provides a standard resource adapter that has the ability to plug into any application server that supports the JCA. Multiple resource adapters, i.e., one per type of EIS, can be added into an application server. This ability enables application components deployed on the application server to access the underlying EISs. Figure 6-4 illustrates the JCA.
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FIGURE 6-4
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Introduction to Legacy Connectivity
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Deployable JCA components are called resource adapters. Basically, resource adapters manage connections or other resources for interaction with some facility. The definition is open ended, as resource adapters can be used for almost anything. A resource adapter manifests itself as an implementation of interfaces in the javax.resource.cci and javax.resource.spi packages. It will require a system-level software library when you are accessing a resource that uses native libraries to connect to an EIS. EIS vendors, middleware or application server vendors, or even end users of legacy systems provide a resource adapter. A resource adapter implements the EIS adapter-side of the connector system contracts. In JCA version 1.0, these contracts include connection management, transaction management, and security. In JCA version 1.5, there are additional contracts that we will discuss later in the chapter. A resource adapter also provides a client-level API that applications use to access an EIS. The client-level API can be the common client interface (CCI) or an API specific to the resource adapter or the EIS. A resource adapter can also be used within an application server environment, which is referred to as a managed environment. The application server interacts with the resource adapter using the system contracts, while JEE components use the client API to access the EIS. A resource adapter can also be used in a two-tier or nonmanaged scenario. In a nonmanaged scenario, an application directly interacts with the resource adapter, using both the system contracts and the client API to connect to the EIS.
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A contract is an agreement between parties to provide collaborative, mutually beneficial interactions. An application server and an EIS collaborate to keep all system-level mechanisms, such as transactions, security, and connection management, transparent to the application components. As a result, an application component provider can focus on the development of business and presentation logic for its application components and need not resolve at the system level issues related to EIS integration. This facilitates development of scalable, secure, and transactional enterprise applications that require connectivity with multiple EISs.
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n The benefits of the system contract are the quid pro quo provided by the
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resource adapter. It is the set of functionality you get to help perform the business task.
n Connection management contracts provide for pool connections to an
underlying EIS and let application components connect to an EIS. This leads to a scalable application environment that can support a large number
6: Legacy Connectivity
of clients requiring access to EISs. Connection management enables the application server to maintain back-end system connections. Support for connection pooling is provided, since creating connections to back-end systems is expensive. Connection pooling enables an EJB server to pool connections to back-end systems, so rather than opening connections on an as-needed basis, connections with data and services are established, configured, cached, and reused automatically by the application server. The contract enables an application server to offer its own services for transaction and security management.
n A transaction management contract between the transaction manager and
an EIS that supports transactional access to EIS resource managers lets an application server use a transaction manager to manage transactions across multiple resource managers. The contract also supports transactions that are managed internal to an EIS resource manager without the necessity of involving an external transaction manager. The transaction management contract supports transactional access to underlying resource managers. The service enables the transaction manager provided within the Enterprise JavaBeans (EJB) server to manage transactions across multiple back-end systems. Connector developers define what level of transaction support they need none, local (with a single back-end system and its resource manager), or the other end of the spectrum, XA with either single or two-phase commit for working across multiple back-end systems and their associated resource managers.
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