Atomic read and delete from Redis using StackExchange.Redis

Question

Is there an easy way to atomically read a value and then delete it from Redis using StackExchange c# driver?
I am buffering items in Redis and when they reach a certain threshold I retrieve them, but I also want to flush my buffer. I need to mention that I store items in a list and by "flushing the buffer" I mean I want to delete the list.
"key" : [list of items]

rediscookbook.org/get_and_delete.html should work with StackExchange.Redis as well. — Christian.K
– Christian.K, Commented Nov 16, 2016 at 14:57
@Christian.K I read that one, but I was wondering if there's an out of the box method or something in the API ( since it's been officially a few hours I am working with StackExchange driver and Redis for that matter). — Ben
– Ben, Commented Nov 16, 2016 at 15:07

thepirat000 · Accepted Answer · 2016-11-16 16:10:45Z

10

You can create a transaction and do the GET/DEL atomically, like this:

var db = connectionMultiplexer.GetDatabase();
var tran = db.CreateTransaction();
var getResult = tran.StringGetAsync(key);
tran.KeyDeleteAsync(key);
tran.Execute();
var value = getResult.Result;

This will send the following commands to Redis:

MULTI
GET "key"
DEL "key"
EXEC

answered Nov 16, 2016 at 16:10

thepirat000

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3 Comments

thepirat000 Over a year ago

If your key is a list, you should probably change the call to tran.ListRangeAsync

Ben Over a year ago

That's exactly what I should do!

adinas Over a year ago

@thepirat000 , If multiple apps (or the same app on multiple servers) are making this request to Redis. Will this code make sure only one will succeed?

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