On Tue, Nov 18, 2008 at 11:06:10AM -0500, David Lively wrote:
The attached patch (against libvirt-java) implements Java bindings for libvirt domain events. This version provides a libvirt EventImpl running in its own Java Thread, and provides per-Connect synchronization that makes using the bindings thread-safe. (Note the Domain, Network, StoragePool, and StorageVol methods also synchronize on their Connect object, as required by libvirt. I have similar changes for NodeDevice.java that need to be made when that code is checked in.)
I don't particularly like the event loop code because it is adding a huge pile of non-portable JNI code that won't work on Windows, which lacks pipe() and poll(). Java already provides a portable pure Java API for building a poll() like event loop in form of NIO. http://www.xhaus.com/alan/python/jynio/select.html The addition of the 'synchronized' annotatioons is something we need regardless of the rest of the patch, since our API contract dictates that only a single thread is allowed to use a single virConnectPtr at once.
This version of the patch also implements and uses an enum class (DomainEvent.Type), as suggested by Tóth István.
IMPORTANT: THIS PATCH WILL BREAK THINGS UNLESS THE NEXT [PATCH 2/2] IS APPLIED TO libvirt FIRST. Also, libvirt must be compiled WITH_PTHREADS for Java events to work.
Daniel -- |: Red Hat, Engineering, London -o- http://people.redhat.com/berrange/ :| |: http://libvirt.org -o- http://virt-manager.org -o- http://ovirt.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: GnuPG: 7D3B9505 -o- F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 :|