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| <title>Tapestry: Web Application Framework</title> |
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| <p>Provides implementations of callbacks, objects that encapsulate a server request that is deferred, |
| typically to allow a user to login or otherwise authenticate before proceeding with |
| some other activity. |
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| <p>In practice, an implementation of {@link org.apache.tapestry.IPage#validate(IRequestCycle)} or |
| {@link org.apache.tapestry.IActionListener} will create a callback, and assign it as a |
| persistent page property of an application-specific login page. After the login completes, it |
| can use the callback to return the user to the functionality that was deferred. |
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| <p>Another example use would be to collect billing and shipping information as part of |
| an e-commerce site's checkout wizard. |
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| @author Howard Lewis Ship <a href="mailto:hlship@apache.org">hlship@apache.org</a> |
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