Conditional Push Notifications in Redis

[Kashyap Mhaisekar]

Hi,

I am looking for a possibility of having Conditional Push Notifications from Redis. Is it possible?

For example,

I have a key say, "counter" in redis.

My java code (Across 30 machines) keep incrementing the counter by INCR. I wanted to be able to generate a notification from REDIS on a channel ONLY when the count reaches 1000.

Do you think it is possible?

Regards,

Kashyap

[Josiah Carlson]

Trivially done with a Lua script.

 - Josiah

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[Kashyap Mhaisekar]

Best piece I received today. Thanks.

[Kashyap Mhaisekar]

Since a redis runs only one lua script at a time, does there have to be a transaction in lua for appending kind of calls?

[Jan-Erik Rediger]

A Lua script itself is already kind of a transaction in that it executes
atomically. Redis is single-threaded and thus can only process one
command at a time, so while your EVAL is executing the Lua script, no
other client can issue commands in between.

On Fri, May 15, 2015 at 09:06:50PM -0500, Kashyap Mhaisekar wrote:
> Since a redis runs only one lua script at a time, does there have to be a
> transaction in lua for appending kind of calls?
> On May 15, 2015 21:03, "Kashyap Mhaisekar" <kash...@gmail.com> wrote:
>
> > Best piece I received today. Thanks.
> > On May 15, 2015 20:09, "Josiah Carlson" <josiah....@gmail.com> wrote:
> >
> >> Trivially done with a Lua script.
> >>
> >> - Josiah
> >>
> >>
> >> On Fri, May 15, 2015 at 5:11 PM, Kashyap Mhaisekar <kash...@gmail.com>
> >> wrote:
> >>
> >>> Hi,
> >>> I am looking for a possibility of having Conditional Push Notifications
> >>> from Redis. Is it possible?
> >>>
> >>> For example,
> >>> I have a key say, "counter" in redis.
> >>>
> >>> My java code (Across 30 machines) keep incrementing the counter by INCR.

> >>> I wanted to be able to generate a notification *from* REDIS on a
> >>> channel *ONLY* when the count reaches 1000.