An example of querying a feed using Redis. (Redis with Query == Reqis)

1. Run a Redis server. I use Docker: https://github.com/dockerfile/redis
2. Build the solution.
3. Run the Indexer and the Enquirer.

The job of the indexer is to use an incoming feed and populate the sets that represent an object matching a query aspect.

The job of the enquirer is to listen for updates and produce a feed of events describing with objects need to be added to the matching set and which objects need to be removed.