Re: [libvirt-users] Where actually is the callback triggered?

2011/4/14 Matthias Bolte <matthias.bolte(a)googlemail.com&gt; > > 2011/4/14 kadir yüceer <kadiryuceer(a)gmail.com&gt;: > > Hi all, > > > > Quick question: > > When the hypervisor triggers a callback which is registered for generic > > events, (assuming I'm connected through qemu+tcp) where exactly is the > > callback triggered? On the hypervisor host or on my host? > > > > Regards > > Kadir > > > > The event system is more complex. > > The hypervisor/connection driver add events to a queue. The events > from this queue are transported to the client and can trigger you > registered callbacks. > > In order to have your callbacks called you need to register an "event > implementation" that is responsible for driving the event delivery. > Recent libvirt exposed it's default "event implementation" via > virEventRegisterDefaultImpl(). > > In order to have events delivered to your callbacks you need to call > virEventRegisterDefaultImpl() or virEventRegisterImpl() with your own > "event implementation". > > I assume you're still talking about the Java bindings here then you > hit the problem that the bindings are incomplete and don't export > virEventRegisterImpl() nor virEventRegisterDefaultImpl() yet. This > means that the event related part of the libvirt API can not be used > from the Java bindings yet. > > > A totally untested patch to add virEventRegisterDefaultImpl() looks like > this: > > > diff --git a/src/main/java/org/libvirt/jna/Libvirt.java > b/src/main/java/org/libvirt/jna/Libvirt.java > index 2c8c03d..5b73859 100644 > --- a/src/main/java/org/libvirt/jna/Libvirt.java > +++ b/src/main/java/org/libvirt/jna/Libvirt.java > @@ -373,4 +373,7 @@ public interface Libvirt extends Library { >     public int virNWFilterGetUUID(NetworkFilterPointer > virNWFilterPtr, byte[] uuidString); >     public int virNWFilterGetUUIDString(NetworkFilterPointer > virNWFilterPtr, byte[] uuidString); >     public int virNWFilterUndefine(NetworkFilterPointer virNWFilterPtr); > + > +    // Event Methods > +    public int virEventRegisterDefaultImpl(void); >  } > > > Then import org.libvirt.jna.Libvirt in your code and call: > > Libvirt.INSTANCE.virEventRegisterDefaultImpl() > > This _should_ register the default event implementation and make > events work for you assuming the rest of your event related code is > correct. > > Matthias First of all, thanks for the answer Matthias, I've been looking for help for some time. I had already tried your suggestion, I added the function just as the same way you did above, and I have this error: Exception in thread "main" java.lang.UnsatisfiedLinkError: Error looking up function 'virEventRegisterDefaultImpl': /usr/local/lib/libvirt.so: undefined symbol: virEventRegisterDefaultImpl         at com.sun.jna.Function.<init>(Function.java:179)         at com.sun.jna.NativeLibrary.getFunction(NativeLibrary.java:345)         at com.sun.jna.NativeLibrary.getFunction(NativeLibrary.java:325)         at com.sun.jna.Library$Handler.invoke(Library.java:203)         at $Proxy0.virEventRegisterDefaultImpl(Unknown Source)         at novatest_v03.MainFrame.main(MainFrame.java:168)