If you would consider using NoSQL, then MongoDB might be a good fit. It has a messaging queue. It's called capped collections with tailable cursors (http://www.

If you would consider using NoSQL, then MongoDB might be a good fit. It has a messaging queue. It's called capped collections with tailable cursors (http://www.mongodb.org/display/DOCS/Tailable+Cursors http://www.mongodb.org/display/DOCS/Tailable+Cursors ). It's persistent, you don't need polling, and you don't need to remove processed messages.