Re: [libvirt-users] Using Java bindings to event callback
At Thu, 5 Dec 2013 16:26:36 +0800,
Howie wrote:
Hi
My test environment :
CentOS 6.3 6.4
Ubuntu 13.10
For CentOS 6.4
libvirt-java-0.4.9-1.el6.noarch
libvirt-python-0.10.2-29.el6.x86_64
libvirt-client-0.10.2-29.el6.x86_64
libvirt-0.10.2-29.el6.x86_64
I am try to use java bindings to event callback.
int register = conn.domainEventRegisterAny(null, 0, cb);
But always get the following error message:
libvirt: Remote Driver error : adding cb to list
exception caught:org.libvirt.LibvirtException: adding cb to list
level:VIR_ERR_ERROR
code:VIR_ERR_RPC
domain:VIR_FROM_REMOTE
hasConn:false
hasDom:false
hasNet:false
message:adding cb to list
str1:%s
str2:adding cb to list
str3:null
int1:-1
int2:-1
At first, you need to initialize an event loop - before connecting to
the libvirt daemon.
Then you need to run that event loop in order to process the events.
If you're using an official libvirt-java release your out of luck as
this is not really supported.
By the way I also trace the mail list
*[libvirt] [PATCH] Java bindings for domain events* (2008 Nov 07)
*[libvirt] [PATCH 1/2] Java bindings for domain events**[libvirt]
[PATCH 2/2] Java bindings for domain events* (2008 Nov 18) --> Reject
patch*Re: [libvirt] [PATCH 1/2] Java bindings for domain events* (2008
Dec) —>No Result*[libvirt-users] Using Java bindings to event
callback * (2010 Jul) —>No Result
*[libvirt] [PATCH 0/2] Libvirt-java event handling (2011Jul)* —>
I think most drivers don't support that. We have a custom driver for
our hypervisor and it works.
*[libvirt] [libvirt-java] [PATCH 00/12] event support* (2013 Jan)
—> *Re: [libvirt] [libvirt-java] [PATCH 00/12] event support (2013
Mar)* --> No Result
Any suggestions?
I'm the author of the latter patches. I haven't had the time working
on these and didn't receive solid reviews on the development list.
A month ago, I began working on them again and have changed large
parts of the interface to simplify it and add more features. Currently
I'm testing the implementation - looks good so far; a small test
program is now running since 9 days straight.
Here's a small sample code to wet your appetite:
----
import org.libvirt.*
import org.libvirt.event.*;
class Monitor implements RebootListener, LifecycleListener {
@Override
public void onReboot(Domain d) {
...
}
@Override
public int onLifecycleChange(Domain d, DomainEvent event) {
...
return 0;
}
}
// required!
Connect.initEventLoop();
Connect c = new Connect("qemu:///system");
Monitor m = new Monitor();
c.addRebootListener(m);
c.addLifecycleListener(m);
// run event loop
c.setKeepAlive(5, 3);
while (c.isAlive) c.processEvent();
----
I hope to get this upstream someday, but momentarily I'm not totally
satisfied and would like to think about it once more.
Anyway, comments are very welcome!
Claudio
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