mirror of
https://gitlab.com/libvirt/libvirt.git
synced 2024-11-05 04:41:20 +00:00
1b2477c674
Signed-off-by: Peter Krempa <pkrempa@redhat.com> Reviewed-by: Erik Skultety <eskultet@redhat.com>
129 lines
3.8 KiB
ReStructuredText
129 lines
3.8 KiB
ReStructuredText
=================
|
|
Java API bindings
|
|
=================
|
|
|
|
.. contents::
|
|
|
|
Presentation
|
|
------------
|
|
|
|
The Java bindings make use of `JNA <https://jna.dev.java.net/>`__ to expose the
|
|
C API in a Java friendly way. The bindings are based on work initiated by Toth
|
|
Istvan.
|
|
|
|
Getting it
|
|
----------
|
|
|
|
The latest versions of the libvirt Java bindings can be downloaded from:
|
|
|
|
- `libvirt.org FTP server <ftp://libvirt.org/libvirt/java/>`__
|
|
- `libvirt.org HTTP server <https://libvirt.org/sources/java/>`__
|
|
|
|
A maven repository is located at https://libvirt.org/maven2/ which you can use
|
|
to include this in your maven projects.
|
|
|
|
GIT source repository
|
|
---------------------
|
|
|
|
The Java bindings code source is now maintained in a
|
|
`git <https://git-scm.com/>`__ repository available on
|
|
`gitlab.com <https://gitlab.com/libvirt/libvirt-java/>`__:
|
|
|
|
::
|
|
|
|
git clone https://gitlab.com/libvirt/libvirt-java.git
|
|
|
|
Building
|
|
--------
|
|
|
|
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
|
|
|
|
::
|
|
|
|
|
|
% cd libvirt-java
|
|
% ant build
|
|
|
|
Content
|
|
-------
|
|
|
|
The bindings are articulated around a few classes in the ``org/libvirt``
|
|
package, notably the ``Connect``, ``Domain`` and ``Network`` ones. Functions in
|
|
the `C API <html/index.html>`__ taking ``virConnectPtr``, ``virDomainPtr`` or
|
|
``virNetworkPtr`` 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:
|
|
|
|
``int virConnectNumOfDomains (virConnectPtr conn);``
|
|
|
|
``int virDomainSetMaxMemory (virDomainPtr domain, unsigned long memory);``
|
|
|
|
become
|
|
|
|
``virConn.numOfDomains()``
|
|
|
|
``virDomain.setMaxMemory(long memory)``
|
|
|
|
There is of course some functions where the mapping is less direct and using
|
|
extra classes to map complex arguments. The
|
|
`Javadoc <https://libvirt.org/sources/java/javadoc>`__ is available online or as
|
|
part of a separate libvirt-java-javadoc package.
|
|
|
|
So let's look at a simple example inspired from the ``test.java`` test found in
|
|
``src`` in the source tree:
|
|
|
|
::
|
|
|
|
import org.libvirt.*;
|
|
public class minitest {
|
|
public static void main(String[] args) {
|
|
Connect conn=null;
|
|
try{
|
|
conn = new Connect("test:///default", true);
|
|
} catch (LibvirtException e) {
|
|
System.out.println("exception caught:"+e);
|
|
System.out.println(e.getError());
|
|
}
|
|
try{
|
|
Domain testDomain=conn.domainLookupByName("test");
|
|
System.out.println("Domain:" + testDomain.getName() + " id " +
|
|
testDomain.getID() + " running " +
|
|
testDomain.getOSType());
|
|
} catch (LibvirtException e) {
|
|
System.out.println("exception caught:"+e);
|
|
System.out.println(e.getError());
|
|
}
|
|
}
|
|
}
|
|
|
|
There is not much to comment about it, it really is a straight mapping from the
|
|
C API, the only points to notice are:
|
|
|
|
- the import of the modules in the ``org.libvirt`` package
|
|
- getting a connection to the hypervisor, in that case using the readonly
|
|
access to the default test hypervisor.
|
|
- getting an object representing the test domain using ``lookupByName``
|
|
- if the domain is not found a LibvirtError exception will be raised
|
|
- extracting and printing some information about the domain using various
|
|
methods associated to the Domain class.
|
|
|
|
Maven
|
|
-----
|
|
|
|
Up until version 0.4.7 the Java bindings were available from the central maven
|
|
repository.
|
|
|
|
If you want to use 0.4.8 or higher, please add the following repository to your
|
|
pom.xml
|
|
|
|
::
|
|
|
|
<repositories>
|
|
<repository>
|
|
<id>libvirt-org</id>
|
|
<url>https://libvirt.org/maven2</url>
|
|
</repository>
|
|
</repositories>
|