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241 lines
12 KiB
HTML
241 lines
12 KiB
HTML
<?xml version="1.0" encoding="ISO-8859-1"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<!--
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This file is autogenerated from java.html.in
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Do not edit this file. Changes will be lost.
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-->
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" />
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<link rel="stylesheet" type="text/css" href="main.css" />
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<link rel="SHORTCUT ICON" href="32favicon.png" />
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<title>libvirt: Java API bindings</title>
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<meta name="description" content="libvirt, virtualization, virtualization API" />
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</head>
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<body>
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<div id="header">
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<div id="headerLogo"></div>
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<form action="search.php" enctype="application/x-www-form-urlencoded" method="get"><div>
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<input id="query" name="query" type="text" size="12" value="" />
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<input id="submit" name="submit" type="submit" value="Search" />
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</div></form>
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<div id="body">
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<div id="menu">
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<ul class="l0"><li>
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<div>
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<a title="Front page of the libvirt website" class="inactive" href="index.html">Home</a>
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</div>
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</li><li>
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<div>
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<a title="Details of new features and bugs fixed in each release" class="inactive" href="news.html">News</a>
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</div>
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</li><li>
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<div>
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<a title="Get the latest source releases, binary builds and get access to the source repository" class="inactive" href="downloads.html">Downloads</a>
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</li><li>
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<div>
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<a title="Information for users, administrators and developers" class="active" href="docs.html">Documentation</a>
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<ul class="l1"><li>
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<div>
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<a title="Information about deploying and using libvirt" class="inactive" href="deployment.html">Deployment</a>
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</div>
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</li><li>
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<div>
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<a title="Overview of the logical subsystems in the libvirt API" class="inactive" href="intro.html">Architecture</a>
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</div>
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</li><li>
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<div>
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<a title="Description of the XML formats used in libvirt" class="inactive" href="format.html">XML format</a>
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</div>
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</li><li>
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<div>
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<a title="Hypervisor specific driver information" class="inactive" href="drivers.html">Drivers</a>
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</li><li>
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<div>
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<a title="Reference manual for the C public API" class="inactive" href="html/index.html">API reference</a>
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</div>
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</li><li>
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<div>
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<a title="Bindings of the libvirt API for other languages" class="active" href="bindings.html">Language bindings</a>
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<ul class="l2"><li>
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<div>
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<a title="overview of the python API bindings" class="inactive" href="python.html">Python</a>
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</li><li>
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<div>
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<span class="active">Java</span>
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</li></ul>
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</div>
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</li><li>
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<div>
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<a title="Working on the internals of libvirt API, driver and daemon code" class="inactive" href="internals.html">Internals</a>
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</div>
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</li></ul>
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</div>
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</li><li>
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<div>
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<a title="User contributed content" class="inactive" href="http://wiki.libvirt.org">Wiki</a>
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</div>
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</li><li>
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<div>
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<a title="Frequently asked questions" class="inactive" href="FAQ.html">FAQ</a>
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</div>
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</li><li>
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<div>
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<a title="How and where to report bugs and request features" class="inactive" href="bugs.html">Bug reports</a>
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</div>
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</li><li>
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<div>
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<a title="How to contact the developers via email and IRC" class="inactive" href="contact.html">Contact</a>
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</div>
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</li><li>
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<div>
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<a title="Miscellaneous links of interest related to libvirt" class="inactive" href="relatedlinks.html">Related Links</a>
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</li><li>
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<div>
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<a title="Overview of all content on the website" class="inactive" href="sitemap.html">Sitemap</a>
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</div>
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</li></ul>
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</div>
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<div id="content">
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<h1>Java API bindings</h1>
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<h2>Presentation</h2>
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<p>The Java bindings are currently a work in progress based mostly
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on the work of Toth Istvan. The first usable release is 0.2.0, where
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most of the naming conventions were defined. Further release will try
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as much as possible to stay compatible</p>
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<h2>Getting it</h2>
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<p>
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The latest versions of the libvirt Java bindings can be downloaded from:
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</p>
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<ul><li><a href="ftp://libvirt.org/libvirt/java/">libvirt.org FTP server</a></li><li><a href="http://libvirt.org/sources/java/">libvirt.org HTTP server</a></li></ul>
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<h2>Hourly development snapshots</h2>
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<p> Once an hour, an automated snapshot is made from the latest CVS server
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source tree. These snapshots should be usable, but we make no guarantees
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about their stability: </p>
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<ul><li><a href="ftp://libvirt.org/libvirt/java/libvirt-java-snapshot.tar.gz">libvirt.org FTP server</a></li><li><a href="http://libvirt.org/sources/java/libvirt-java-snapshot.tar.gz">libvirt.org HTTP server</a></li></ul>
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<h2>CVS repository access</h2>
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<p> The master source repository uses <a href="http://ximbiot.com/cvs/cvshome/docs/">CVS</a> and anonymous access
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is provided. Prior to accessing the server is it necessary to authenticate
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using the password <code>anoncvs</code>. This can be accomplished with
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the <code>cvs login</code> command:
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</p>
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<pre>
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# cvs -d :pserver:anoncvs@libvirt.org:2401/data/cvs login
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</pre>
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<p>
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Once authenticated, a checkout can be obtained using
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</p>
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<pre>
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# cvs -d :pserver:anoncvs@libvirt.org:2401/data/cvs co libvirt-java
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</pre>
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<p>
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The libvirt-java build process uses GNU autotools, so after obtaining a checkout
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it is necessary to generate the configure script and Makefile.in templates
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using the <code>autogen.sh</code> command. As an example, to do a complete
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build and install it into your home directory run:
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</p>
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<pre>
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./autogen.sh --prefix=$HOME/usr
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make
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make install
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</pre>
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<p>Other build system are not currently available but as usual we take patches
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(Eclipse/ant/...) would be welcome !</p>
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<p> currently libvirt-java requires a version of libvirt >= 0.4.0 to be
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installed as well as the associated libvirt development files/package. It
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should compile with any java implementation >= 1.5, the bindings uses
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the enum construct which appeared only in that version.</p>
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<p>Libvirt-java bindings development occurs on the same mailing-list as
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the normal libvirt work see <a href="contact.html">the associated contact
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page</a></p>
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<h2>GIT repository mirror</h2>
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<p>
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The CVS source repository is also mirrored using GIT, and is available
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for anonymous access via:
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</p>
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<pre>
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git clone git://git.et.redhat.com/libvirt-java
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</pre>
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<p>
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It can also be browsed at
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</p>
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<pre>
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<a href="http://git.et.redhat.com/?p=libvirt-java.git;a=summary">http://git.et.redhat.com/?p=libvirt-java.git;a=summary</a>
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</pre>
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<h2>Content</h2>
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<p>The bindings are articulated around a few
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classes in the <code>org/libvirt</code> namespace, notably the
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<code>Connect</code>, <code>Domain</code> and <code>Network</code>
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ones. Functions in the <a href="html/libvirt-libvirt.html">C API</a>
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taking <code>virConnectPtr</code>, <code>virDomainPtr</code> or
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<code>virNetworkPtr</code> as their first argument usually become
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methods for the classes, their name is just stripped from the
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virConnect or virDomain(Get) prefix and the first letter gets converted to
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lower case, for example the C functions:</p>
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<p>
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<code>int <a href="html/libvirt-libvirt.html#virConnectNumOfDomains">virConnectNumOfDomains</a>
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(virConnectPtr conn);</code>
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</p>
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<p>
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<code>int <a href="html/libvirt-libvirt.html#virDomainSetMaxMemory">virDomainSetMaxMemory</a>
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(virDomainPtr domain, unsigned long memory);</code>
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</p>
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<p>become</p>
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<p>
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<code>virConn::numOfDomains()</code>
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</p>
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<p>
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<code>virDomain::setMaxMemory(long memory)</code>
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</p>
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<p> There is of course some functions where the mapping is less direct
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and using extra classes to map complex arguments. The <a href="http://libvirt.org/org/libvirt/package-summary.html">Javadoc</a> is available online or as
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part of a separate libvirt-java-javadoc package.</p>
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<p>So let's look at a simple example inspired from the
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<code>test.java</code> test found in <code>src</code> in the source tree:</p>
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<pre>import <span style="color: #0071FF; background-color: #FFFFFF">org.libvirt.*</span>;
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public class minitest {
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public static void main(String[] args) {
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Connect conn=null;
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try{
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conn = new <span style="color: #0071FF; background-color: #FFFFFF">Connect</span>("test:///default", true);
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} catch (<span style="color: #0071FF; background-color: #FFFFFF">LibvirtException</span> e){
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System.out.println("exception caught:"+e);
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System.out.println(e.getError());
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}
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try{
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<span style="color: #0071FF; background-color: #FFFFFF">Domain</span> testDomain=conn.<span style="color: #007F00; background-color: #FFFFFF">domainLookupByName</span>("test");
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System.out.println("Domain:" + testDomain.<span style="color: #E50073; background-color: #FFFFFF">getName</span>() + " id " +
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testDomain.<span style="color: #E50073; background-color: #FFFFFF">getID</span>() + " running " +
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testDomain.<span style="color: #E50073; background-color: #FFFFFF">getOSType</span>());
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} catch (<span style="color: #0071FF; background-color: #FFFFFF">LibvirtException</span> e){
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System.out.println("exception caught:"+e);
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System.out.println(e.getError());
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}
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}
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}
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</pre>
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<p>There is not much to comment about it, it really is a straight mapping
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from the C API, the only points to notice are:</p>
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<ul><li>the import of the modules in the <code><span style="color: #0071FF; background-color: #FFFFFF">org.libvirt</span></code> namespace</li><li>getting a connection to the hypervisor, in that case using the
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readonly access to the default test hypervisor.</li><li>getting an object representing the test domain using <span style="color: #007F00; background-color: #FFFFFF">lookupByName</span></li><li>if the domain is not found a LibvirtError exception will be raised</li><li>extracting and printing some information about the domain using
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various <span style="color: #E50073; background-color: #FFFFFF">methods</span>
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associated to the Domain class.</li></ul>
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</div>
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</div>
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<div id="footer">
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<p id="sponsor">
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Sponsored by:<br /><a href="http://et.redhat.com/"><img src="et.png" alt="Project sponsored by Red Hat Emerging Technology" /></a></p>
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</div>
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</body>
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</html>
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