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javamavenosgiupdatesapache-ace

OSGi: How to know if a bundle was updated

In OSGi (Apache Felix 4.2.1), I want my bundles to check for updates automatically on startup.

I do this with the following code (in my "management agent"). How can I tell whether a bundle was updated?

Bundle[] bundles = context.getBundles();
for (int i = 0; i < bundles.length; i++) {
  Bundle bundle = bundles[i];
  bundle.update();
}
// which bundle was updated?

I want to refresh the bundles automatically (using FrameworkWiring), but only if one of the .update() calls actually resulted in a new deployment from my server.

As I'm deploying from Maven to my OBR, my SNAPSHOT version have all the same number. From gogo, I can see that the Bnd-LastModified header changes, but how to automate this?

PS: If easy solutions exist which solve the whole update thing more nicely than rolling my own, I'm interested as well. It needs to be lean. (Apache Karaf?, Apache ACE? others?)

Solution

  • If you want to learn a bit more about Apache ACE, I can recommend reading the following two articles on the ACE website:

    To be honest, if all you want is to updated a set of bundles on startup, then ACE is a bit overkill. It can be used to manage multiple "targets" (frameworks running OSGi) from a central server, automatically pushing updates to it and managing large sets of bundles and other artifacts, grouping them in features and distributions.