Hi!
I created a small counting algorithm first in JavaScript. Seems to
work ok. But this is of course single threaded and I could only store
snapshots of it to DB. So I started thinking that what if I use Redis
directly as the memory. Then I could have multiple threads or even
servers running against it.
However, the algorithm limits the stuff that is kept in memory. So,
basically I need to do something like this:
redis.zincrby(key, 1, str, function (err, reply) {
redis.zcard(key, function (err, N) {
If (N > maxSize) {
// do stuff with the keys, including delete some (this is a
few callbacks here...)
}
}
I.e. I add counters (zincrby ands new one if it doesn't exists), but
if there are too many as a result of that, I need to do some cleaning.
But obviously, the whole thing works in threaded situation only if
that code is blocking. So, I can't run multiple servers against redis
like this or this whole code should block redis (I guess I could store
this kind of procedure to MongoDB...). But is there even a way to
block single node.js event loop for this? I know that would not be
wise (for keeping up the speed), but I'm just trying to learn how to
do this kind of stuff? Should all cases where I need blocking with the
DB done with stored procedures in the DB?
--
HG.
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