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Introduction to the series

All three articles of this series present a single Web application, which was progressively enhanced with each subsequent part. This section provides a brief overview of the sample application.

Part 1 starts with a typical JSF form named SupportForm.jsp and presents a set of reusable JavaScript functions for getting, encoding, and submitting form data with Ajax, which lets you save user input automatically, periodically, and transparently. You can find the source code of the JavaScript functions in the AutoSaveScript.js file of the sample application. Part 1 also explains how to build a JSF phase listener named AutoSaveListener, which handles the Ajax requests. The listener class was modified in Part 2.

In Part 2, you see how to store the data of the current JSF view into a data repository. The DataMapRepository class is a Map containing data maps. Each data map maintains the user input of a single form instance. Any access to the data repository is made through a thread-safe wrapper class named RepositoryWrapper. A servlet context listener named DataMapPersistence is used to serialize the repository into a file before shutdown and restore the repository's state after startup. Part 2 also presents a servlet filter named BrowserIdFilter, which is used to identify anonymous users across browser sessions.

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