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</script><!--End Google Analytics code--></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">1. Introduction</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="index.html">Prev</a> </td><th width="60%" align="center"> </th><td width="20%" align="right"> <a accesskey="n" href="ch01s02.html">Next</a></td></tr></table><hr></div><div class="chapter" lang="en"><div class="titlepage"><div><div><h2 class="title"><a name="introduction"></a>1. Introduction</h2></div></div></div><p> | |
This Guide covers Virgo Snaps and assumes you are already familiar with OSGi and Virgo. See <a class="link" href="ch05.html" title="5. Further Reading">here</a>. | |
</p><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="introduction-concepts"></a>1.1 Concepts</h2></div></div></div><p> | |
Using Virgo Snaps, or VS for short, you can construct a web application from multiple OSGi | |
bundles, each of which serves up content for a distinct sub-portion of your application's URL space. VS | |
applications are arranged in a parent/child structure, with each application having at most one top-level parent, and zero or more | |
children/grand children and so on. Parents are referred to as the hosts, children as snaps. | |
</p><p> | |
<img src="images/snapsAndHosts.png"> | |
</p><p> | |
Here you see that any <code class="literal">HTTP</code> requests for '/app' will be dealt with by the host bundle while '/app/orders' | |
and '/app/billing' will be dealt with by their respective snaps bundles. Each host/snap can use completely different web technologies | |
to deal with the requests, VS places no restrictions on your choices. The developer decides how to split | |
the application up and how closely to couple the host and various snaps. VS has been designed to be as | |
un-invasive as possible while still making it easy to share information between the host and its snaps. | |
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