Provide some way to do "SELECT ... FOR UPDATE"

[James Henstridge]

It would be nice if Storm provided a way to issue "SELECT ... FOR UPDATE" queries as a way to acquire write locks on particular rows in a table.

I'd imagine the primary entry points where a user might want to do this is in Store.get() and a similar ResultSet API. I am not quite sure what the API should look like though.

[Edoardo Serra (edoardo-serra)]

I started implementing this feature in the linked branch.

I've been using Storm for a while but I started looking at its code a few days ago, so feel free to criticise my design and implementation!

I implemented the feature as a method of the ResultSet which seemed to me to be the correct place.
I'm also considering to implement the feature in Store.get(), will follow in the next days.

Since I have some issues on running tests on my machine I did not commit them yet.

My 2 cents

[Edoardo Serra (edoardo-serra)]

I implemented the feature in Store.get() and wrote the unit tests.

I think the branch is now ready to be reviewed.

Hope it hepls