[swaranga]

I built a system in my previous team where clients can register "filters" described in Fusion. My system, which was a source of a lot of different notifications, would then run these filters and only send those notifications that passed the filters. It became very popular very quickly because of the easy on-boarding and the fact that clients not get only a fraction of the messages they were interested in. I just checked the Java implementation, it seems to be still active and get commits.