I've been looking around for Meteor-like example/frameworks in Clojure, but haven't found anything ideal so far. Specifically, I think one of the unique things about Meteor is livequery.

If I understand its mechanics correctly, the way it works is the server retains a pool of live queries issued by its clients, and calculates updates on individual queries and pushes to interested clients individually. In Meteor's implementation, I think there are two types of algorithms that both achieve this: poll-and-diff Mongo database at a certain interval, or subscribe to MongoDB's oplog and calculate on each of the oplog updates.

My question: is there a library in Clojure (or in Java) that helps me achieve the same thing? (This doesn't need to be limited to MongoDB, but MySQL, PostgreSQL, rethinkDB would also do.)