Developing easily configurable software is of paramount importance in today's business environment.
Tutorial Details:
Software applications are no longer judged simply by the amount of business logic that they encapsulate; they are also judged by how easy they are to maintain. The ability to alter software behavior, via configuration, forms an important aspect of this maintenance cycle.
While the Java language provides a number of features, such as property files and resource bundles, to aid configuration, these lack the features required for today's dynamic business environments. Many Java standards, tools, and containers already utilize more advanced and custom XML configuration formats.
The Obix Framework is an open source framework that provides the common means and formats for storing configuration data in XML, and for accessing this data via simple Java objects. It enables the modularization of configuration data by allowing configuration files to be imported and included in each other, and by organizing configuration information into "modules."
In addition, it supports "hot" configuration amendments—through auto-detection and auto-reload of changes to configuration data—and also provides support for the Java Naming and Directory Interface API (JNDI). Furthermore, it can be integrated into Java applications in numerous ways, including through Java Management Extensions (JMX) and Java Platform, Enterprise Edition listeners that do not require coding, as well as plain Java classes that can be invoked directly. Finally, the framework provides an easy-to-use plug-in API that lets developers extend it to perform initialization-related tasks. This API has been used by the Obix team to provide initialization utilities for other open source frameworks such as Apache's log4j, Hibernate, and Commons DBCP (database connection pools).
In this tutorial, I describe a hypothetical scenario that requires configurable software and for which we create skeletal applications using Obix. The first example provides the closest thing to a "Hello World"-style proof of concept, while the second and third extend this application to showcase less trivial aspects of configuration.
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