> On 22 Feb 2016, at 21:28, Steve Marotta <smaro...@cra.com> wrote: > > That’s an interesting idea. I didn’t realize that OSGi had built-in weaving > capabilities. I looked at the spec and saw that there’s a partial example of > how to use WeavingHook, but it didn’t talk about how to actually perform the > bytecode manipulation, leaving it instead as an “exercise to the reader”.
This is because OSGi has no business telling you how to do bytecode manipulation. There are plenty of existing tools that do this, including e.g. ASM and CGLIB. The purpose of the Weaving specification in OSGi is only to give you a point where you can hook these tools into the OSGi lifecycle. > Where can I find an example of how to do this? Or would it be easier if I > simply used a tool like AspectJ? Does AspectJ play nicely with OSGi? Possibly not… AspectJ does a fair bit more than you actually need. If somebody has gone to the trouble of fully integrating AspectJ into OSGi then you might want to use it, otherwise you’re probably looking at a lot more work than necessary. I would go with ASM, personally. Regards, Neil > > From: osgi-dev-boun...@mail.osgi.org [mailto:osgi-dev-boun...@mail.osgi.org] > On Behalf Of Raymond Auge > Sent: Thursday, February 18, 2016 11:25 AM > To: OSGi Developer Mail List > Subject: Re: [osgi-dev] Monitor method calls for a bundle? > > If you want to get really crazy you can go to full Weaving (Chapter 56 of > Core spec). > > - Ray > > On Thu, Feb 18, 2016 at 11:17 AM, elias vasylenko <eliasvasyle...@gmail.com > <mailto:eliasvasyle...@gmail.com>> wrote: > The standard OSGi way I suppose would be to use service hooks to intercept > service registrations, and re-register proxied versions. Would be simple > enough to intercept invocation parameters and results in this way. > > Cheers, > > Eli > > On Thu, 18 Feb 2016 at 16:10 Steve Marotta <smaro...@cra.com > <mailto:smaro...@cra.com>> wrote: > Hello, > > I was wondering if there was a way, built into OSGi, to automatically listen > for any time that code in one bundle invokes a method on a service in another > bundle. For example, if I have a service defined with a method that takes a > “name” string and queries a database to return an “address” string, I want to > be able to build a separate component that will listen for these method calls > and invoke a callback both when the method is called, where I can see the > name string that was passed, and a callback when the method returns, where I > can see the address string that comes back. I could do this manually using > something like aspect-oriented programming, but if there is a way to do this > that is built into OSGi, then it will save me the trouble. > > Thanks, > Steve > _______________________________________________ > OSGi Developer Mail List > osgi-dev@mail.osgi.org <mailto:osgi-dev@mail.osgi.org> > https://mail.osgi.org/mailman/listinfo/osgi-dev > <https://mail.osgi.org/mailman/listinfo/osgi-dev> > > _______________________________________________ > OSGi Developer Mail List > osgi-dev@mail.osgi.org <mailto:osgi-dev@mail.osgi.org> > https://mail.osgi.org/mailman/listinfo/osgi-dev > <https://mail.osgi.org/mailman/listinfo/osgi-dev> > > > > -- > Raymond Augé <http://www.liferay.com/web/raymond.auge/profile> (@rotty3000) > Senior Software Architect Liferay, Inc. <http://www.liferay.com/> (@Liferay) > Board Member & EEG Co-Chair, OSGi Alliance <http://osgi.org/> (@OSGiAlliance) > _______________________________________________ > OSGi Developer Mail List > osgi-dev@mail.osgi.org > https://mail.osgi.org/mailman/listinfo/osgi-dev
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