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Identify the Gamma et al. Design Pattern Associated with a Specified Java EE Technology Feature
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3 19. A and B are correct. The Decorator pattern appears in the java.io and java.awt packages. C and D are incorrect. These do not contain the Decorator pattern. 3 20. B is correct. The java.util package contains classes that implement the Iterator design pattern. A, C, and D are incorrect. These do not implement the Iterator design pattern. 3 21. A and C are correct. The Enumeration interface contains hasMoreElements() and nextElement() methods. B and D are incorrect. These are not valid methods in the Enumeration interface.
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Legacy Connectivity
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6.01 Distinguish Appropriate from Inappropriate Techniques for Providing Access to a Legacy System from Java Technology Code Given an Outline Description of That Legacy System
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6: Legacy Connectivity
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he capacity and capability to migrate legacy systems to Java 2 Enterprise Edition (JEE) is on the increase as the need to web-enable legacy systems increases. A growing number of legacy systems, including IBM mainframe, UNIX, and client/server, can now be migrated to or integrated with JEE to take advantage of its security, speed, reliability, and cross-platform capabilities. Some of the benefits of this are freedom from obsolete software, return on the original investment in legacy systems (especially after Y2K) via extended life of these systems, and opportunities for e-commerce using legacy systems and databases. To that end, this chapter will cover the following topics:
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n Engineering the Enterprise Information Systems (EIS) Integration Tier n Best practices for EIS integration n Guidelines for data access n EIS access objects and connections n Java Enterprise Engineering: Services n Role of transactions n Best practices relating to transactions in each tier n Appropriate and inappropriate use for given situations
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Introduction to Legacy Connectivity
As businesses move toward an e-business strategy, the challenge of legacy connectivity is to enable each enterprise to integrate new e-business applications with existing enterprise information systems (EISs). Enterprise applications require access to applications running on an EIS. These systems provide the information infrastructure for an enterprise the so-called books and records, as they say on Wall Street. EISs include enterprise mainframe transaction processing systems, relational database management systems (RDBMS), and other legacy information systems. Enterprises run their businesses using the information stored in these systems, and the success of an enterprise critically depends on this information. Enterprises with successful e-businesses need to integrate their EISs with web-based applications. They need to extend the reach of their EISs to support business-to-business (B2B) transactions. Before the JEE Connector Architecture (JCA) was defined, no specification for the Java platform addressed the problem of providing a standard architecture for integrating an EIS. We used JNI (Java Native Interface) and RMI (Remote Method Invocation)
Introduction to Legacy Connectivity
to create a Java interface to a process running in its native domain. For example, a Java program using JNI, RMI, or CORBA (Common Object Request Broker) can call a C++ program running on a Windows NT machine. Most EIS vendors as well as application server vendors use nonstandard proprietary architectures to provide connectivity between application servers and enterprise information systems that provide services such as messaging, legacy database access, and mainframe transaction or batch processing. Figure 6-1 illustrates the complexity of an EIS environment.
FIGURE 6-1
EIS environment: legacy applications with an e-business front end
6: Legacy Connectivity
Legacy Connectivity Using Java: the Classic Approach
Thus far, the classic approach to legacy connectivity is based on the two-tier client/ server model, which is typical of applications that are not based on the web. With this approach, an EIS provides an adapter that defines an application programming interface (API) for accessing the data and functions of the EIS basically, you black-box the target system and create a Java API. A typical client application accesses data and functions exposed by an EIS through this adapter interface. The client uses the programmatic API exposed by the adapter to connect to and access the EIS. The adapter implements the support for communication with the EIS and provides access to EIS data and functions. Communication between an adapter and the EIS typically uses a protocol specific to the EIS. This protocol provides support for security and transactions, along with support for content propagation from an application to the EIS. Most adapters expose an API to the client that abstracts out the details of the underlying protocol and the distribution mechanism between the EIS and the adapter. In most cases, a resource adapter is specific to a particular EIS. However, an EIS may provide more than one adapter that a client can use to access the EIS. Because the key to EIS adapters is their reusability, independent software vendors try to develop adapters that employ a widely used programming language to expose a client programming model that has the greatest degree of reusability.
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