barcode in vb.net 2008 JEE Best Practices: EIS Integration Tier in Java

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JEE Best Practices: EIS Integration Tier
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The EIS Integration tier provides the information infrastructure for an enterprise. Accessing EIS can be complex, requiring vendor-specific knowledge of the following:
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n Application programming model n Transactions n Security
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The EJB Tier
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JEE reduces the complexity of accessing an enterprise information system by relying on the web and EJB containers to handle transactions, security, and scalability. JDBC accesses relational data. JNDI accesses enterprise name and directory services. JMS sends and receives messages using enterprise messaging systems. JavaMail sends and receives mail. JavaIDL calls CORBA services. JNI calls services written in other languages JNI can interact with native languages. As more businesses move toward an e-business strategy, integration with existing EISs becomes the key to success. Enterprises with successful e-businesses need to integrate their existing EISs with new web-based applications, possibly using the JEE APIs that match the existing EIS functionality. JEE APIs extend the reach of the EISs to support business-to-business (B2B) transactions. Before the JEE Connector architecture was defined, no specification for the Java platform addressed the problem of providing a standard architecture for integrating heterogeneous EISs. Most EIS vendors and application server vendors use nonstandard vendor-specific architectures to provide connectivity between application servers and EISs. Figure 4-14 illustrates the complexity of a heterogeneous environment. The JEE Connector architecture provides a Java solution to the problem of connectivity among the many application servers and EISs already in existence. By using the JEE Connector architecture, EIS vendors no longer need to customize their products for each application server. Application server vendors who conform to the JEE Connector architecture do not need to add custom code whenever they want to add connectivity to a new EIS.
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FIGURE 4-14
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The heterogeneous enterprise architecture
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4: Applicability of JEE Technology
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The JEE Connector architecture is based on the technologies that are defined and standardized as part of the JEE.
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JEE Connector Overview
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The JEE Connector architecture defines a standard architecture for connecting the JEE platform to heterogeneous EISs. Examples of EISs exist in almost any enterprise computing environment. A nonexhaustive list includes ERP, mainframe transaction processing, database systems, and legacy applications not written in the Java programming language. By defining a set of scalable, secure, and transactional mechanisms, the JEE Connector architecture enables the integration of EISs with application servers and enterprise applications. The JEE Connector architecture enables an EIS vendor to provide a standard resource adapter for its EIS. The resource adapter plugs into an application server, providing connectivity among the EIS, the application server, and the enterprise application. If an application server vendor has extended its system to support the JEE Connector architecture, it has connectivity to multiple EISs. An EIS vendor needs to provide just one standard resource adapter that has the capability to plug into any application server that supports the JEE Connector architecture. Multiple resource adapters (that is, one resource adapter per type of EIS) are pluggable into an application server. This capability enables application components deployed on the application server to access the underlying EISs. Figure 4-15 illustrates the JEE Connector architecture.
FIGURE 4-15
The JEE Connector architecture
The EJB Tier
Resource Adapter
To achieve standard, system-level pluggability between application servers and EISs, the JEE Connector architecture defines a standard set of system-level contracts between an application server and EIS. The resource adapter implements the EIS side of these system-level contracts. A resource 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 resource adapter collaborates with the server to provide the underlying mechanisms, the transactions, security, and connection pooling mechanisms. A resource adapter is used within the address space of the application server.
System Contract
An application server and an EIS collaborate to keep all system-level mechanisms, such as transactions, security, and connection management, transparent from the application components. As a result, an application component provider focuses on the development of business and presentation logic for its application components and need not get involved in the system-level issues related to EIS integration. This promotes easier and faster development of scalable, secure, and transactional enterprise applications that require connectivity with multiple EISs. The JEE Connector architecture defines the following set of system-level contracts between an application server and EIS:
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