mirror of
https://gitlab.com/libvirt/libvirt.git
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161 lines
6.5 KiB
XML
161 lines
6.5 KiB
XML
<?xml version="1.0"?>
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<html>
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<body>
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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>
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<li><a href="ftp://libvirt.org/libvirt/java/">libvirt.org FTP server</a></li>
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<li><a href="http://libvirt.org/sources/java/">libvirt.org HTTP server</a></li>
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</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>
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<li><a href="ftp://libvirt.org/libvirt/java/libvirt-java-snapshot.tar.gz">libvirt.org FTP server</a></li>
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<li><a href="http://libvirt.org/sources/java/libvirt-java-snapshot.tar.gz">libvirt.org HTTP server</a></li>
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</ul>
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<h2>CVS repository access</h2>
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<p> The master source repository uses <a
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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>
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<li>the import of the modules in the <code><span style="color: #0071FF; background-color: #FFFFFF">org.libvirt</span></code> namespace</li>
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<li>getting a connection to the hypervisor, in that case using the
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readonly access to the default test hypervisor.</li>
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<li>getting an object representing the test domain using <span style="color: #007F00; background-color: #FFFFFF">lookupByName</span></li>
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<li>if the domain is not found a LibvirtError exception will be raised</li>
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<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>
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</ul>
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</body>
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</html>
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