mirror of
https://gitlab.com/libvirt/libvirt.git
synced 2024-12-26 23:55:23 +00:00
162 lines
5.9 KiB
XML
162 lines
5.9 KiB
XML
<?xml version="1.0"?>
|
|
<html>
|
|
<body>
|
|
<h1>Java API bindings</h1>
|
|
|
|
<h2>Presentation</h2>
|
|
<p>The Java bindings make use of <a href="https://jna.dev.java.net/">JNA</a>
|
|
to expose the C API in a Java friendly way. The bindings are based on
|
|
work initiated by Toth Istvan.</p>
|
|
|
|
<h2>Getting it</h2>
|
|
<p>
|
|
The latest versions of the libvirt Java bindings can be downloaded from:
|
|
</p>
|
|
|
|
<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>
|
|
|
|
<h3>Maven</h3>
|
|
<p>A maven repository is located at <a href="http://www.libvirt.org/maven2/">http://www.libvirt.org/maven2/</a>
|
|
which you can use to include this in your maven projects.</p>
|
|
|
|
<h2>GIT source repository</h2>
|
|
<p> The Java bindings code source is now maintained in a <a
|
|
href="http://git-scm.com/">git</a> repository available on
|
|
<a href="http://libvirt.org/git/">libvirt.org</a>:
|
|
</p>
|
|
<pre>
|
|
git clone git://libvirt.org/libvirt-java.git
|
|
</pre>
|
|
<p>
|
|
It can also be browsed at
|
|
</p>
|
|
<pre>
|
|
|
|
<a href="http://libvirt.org/git/?p=libvirt-java.git;a=summary">http://libvirt.org/git/?p=libvirt-java.git;a=summary</a>
|
|
</pre>
|
|
|
|
<p></p>
|
|
<h2>GIT repository mirror</h2>
|
|
|
|
<p>
|
|
The source code is also mirrored on <a href="http://www.gitorious.org">gitorious</a>
|
|
to aid in public development. You clone the repo with
|
|
</p>
|
|
|
|
<pre>
|
|
git clone git://gitorious.org/libvirt/libvirt-java.git
|
|
</pre>
|
|
|
|
<p>
|
|
It can also be browsed at
|
|
</p>
|
|
|
|
<pre>
|
|
|
|
<a href="http://gitorious.org/libvirt/libvirt-java">http://gitorious.org/libvirt/libvirt-java</a>
|
|
</pre>
|
|
|
|
<p></p>
|
|
<h2>CVS repository access (Deprecated)</h2>
|
|
|
|
<p> The old source repository uses <a
|
|
href="http://ximbiot.com/cvs/cvshome/docs/">CVS</a> and anonymous access
|
|
is provided. Prior to accessing the server is it necessary to authenticate
|
|
using the password <code>anoncvs</code>. This can be accomplished with
|
|
the <code>cvs login</code> command:
|
|
</p>
|
|
|
|
<pre>
|
|
# cvs -d :pserver:anoncvs@libvirt.org:2401/data/cvs login
|
|
</pre>
|
|
|
|
<p>
|
|
Once authenticated, a checkout can be obtained using
|
|
</p>
|
|
|
|
<pre>
|
|
# cvs -d :pserver:anoncvs@libvirt.org:2401/data/cvs co libvirt-java
|
|
</pre>
|
|
|
|
<p></p>
|
|
<h2>Building</h2>
|
|
<p>The code is built using ant, and assumes that you have the jna jar installed. Once you have downloaded
|
|
the code you can build the code with</p>
|
|
|
|
<pre>
|
|
|
|
% cd libvirt-java
|
|
% ant build
|
|
</pre>
|
|
|
|
|
|
<h2>Content</h2>
|
|
<p>The bindings are articulated around a few
|
|
classes in the <code>org/libvirt</code> package, notably the
|
|
<code>Connect</code>, <code>Domain</code> and <code>Network</code>
|
|
ones. Functions in the <a href="html/libvirt-libvirt.html">C API</a>
|
|
taking <code>virConnectPtr</code>, <code>virDomainPtr</code> or
|
|
<code>virNetworkPtr</code> as their first argument usually become
|
|
methods for the classes, their name is just stripped from the
|
|
virConnect or virDomain(Get) prefix and the first letter gets converted to
|
|
lower case, for example the C functions:</p>
|
|
<p>
|
|
<code>int <a href="html/libvirt-libvirt.html#virConnectNumOfDomains">virConnectNumOfDomains</a>
|
|
(virConnectPtr conn);</code>
|
|
</p>
|
|
<p>
|
|
<code>int <a href="html/libvirt-libvirt.html#virDomainSetMaxMemory">virDomainSetMaxMemory</a>
|
|
(virDomainPtr domain, unsigned long memory);</code>
|
|
</p>
|
|
<p>become</p>
|
|
<p>
|
|
<code>virConn.numOfDomains()</code>
|
|
</p>
|
|
<p>
|
|
<code>virDomain.setMaxMemory(long memory)</code>
|
|
</p>
|
|
<p> There is of course some functions where the mapping is less direct
|
|
and using extra classes to map complex arguments. The <a href="http://libvirt.org/sources/java/javadoc">Javadoc</a> is available online or as
|
|
part of a separate libvirt-java-javadoc package.</p>
|
|
<p>So let's look at a simple example inspired from the
|
|
<code>test.java</code> test found in <code>src</code> in the source tree:</p>
|
|
<pre>import <span style="color: #0071FF; background-color: #FFFFFF">org.libvirt.*</span>;
|
|
public class minitest {
|
|
public static void main(String[] args) {
|
|
Connect conn=null;
|
|
try{
|
|
conn = new <span style="color: #0071FF; background-color: #FFFFFF">Connect</span>("test:///default", true);
|
|
} catch (<span style="color: #0071FF; background-color: #FFFFFF">LibvirtException</span> e){
|
|
System.out.println("exception caught:"+e);
|
|
System.out.println(e.getError());
|
|
}
|
|
try{
|
|
<span style="color: #0071FF; background-color: #FFFFFF">Domain</span> testDomain=conn.<span style="color: #007F00; background-color: #FFFFFF">domainLookupByName</span>("test");
|
|
System.out.println("Domain:" + testDomain.<span style="color: #E50073; background-color: #FFFFFF">getName</span>() + " id " +
|
|
testDomain.<span style="color: #E50073; background-color: #FFFFFF">getID</span>() + " running " +
|
|
testDomain.<span style="color: #E50073; background-color: #FFFFFF">getOSType</span>());
|
|
} catch (<span style="color: #0071FF; background-color: #FFFFFF">LibvirtException</span> e){
|
|
System.out.println("exception caught:"+e);
|
|
System.out.println(e.getError());
|
|
}
|
|
}
|
|
}
|
|
</pre>
|
|
<p>There is not much to comment about it, it really is a straight mapping
|
|
from the C API, the only points to notice are:</p>
|
|
<ul>
|
|
<li>the import of the modules in the <code><span style="color: #0071FF; background-color: #FFFFFF">org.libvirt</span></code> package</li>
|
|
<li>getting a connection to the hypervisor, in that case using the
|
|
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
|
|
various <span style="color: #E50073; background-color: #FFFFFF">methods</span>
|
|
associated to the Domain class.</li>
|
|
</ul>
|
|
</body>
|
|
</html>
|