Each time that the EquinoxServiceDiscoverer is called to find a service, it obtains the list of bundles in the bundle context and filters them to identify the Tuscany bundle providers. This could be improved by using a bundle tracker to maintain a list of matching bundles. There actually is some bundle tracker code in the class but it is unused. I am attaching a patch to utilize the bundle tracker.
The patch creates two bundle trackers, one for all bundles and one for the Tuscany service providing bundles. I changed getBundles() to get the list of bundles from the appropriate tracker rather than the bundle context.
There are open questions in the code about what state a bundle should be in to be considered. I tried to maintain compatibility with the existing filtering code (isProviderBundle) which accepts all states except UNINSTALLED. Therefore I changed the bundle tracker constructor to include all bundle states except UNINSTALLED. I removed the check in addingBundle() for a STOPPED event because this was not a criteria used in isProviderBundle().