[LRUG] Event Bus in ruby

[Stephen Best]

Klaus I think you answered your own question with "implement a simple
observer pattern". Synchronous pub/sub is trivial to implement with plain
old Ruby objects with this approach offering the best in terms of
decoupling.

Applied correctly it should be very easy to later swap out your event
consumers for objects that put jobs onto asynchronous queues.

Wisper seems to encourage users to have domain or ActiveRecord objects emit
events which I find a bit distasteful.

EventBus seems like a much better option if you'd rather use a library.

Bestie.

theaudaciouscodeexperiment.com
github.com/bestie
@thebestie


On 20 August 2014 12:15, Klaus Hebsgaard <klaus at hebsgaard.dk> wrote:

> Thank you everyone who gave suggestions
>
> Med Venlig hilsen / Best regards
>
> Klaus Hebsgaard
>
> Website: http://www.hebsgaard.dk
> Blog: *http://blog.khebbie.dk <http://blog.khebbie.dk>*
> LinkedIIn: http://www.linkedin.com/in/klaushebsgaard
> Github: https://github.com/khebbie
>
>
> On Wed, Aug 20, 2014 at 12:41 PM, James Pike <lrug at chilon.net> wrote:
>
>> The awkward thing about Redis is you only get a single "watch" per TCP
>> connection, with the exception of pub sub (which puts your connection
>> into "subscriber mode" and limits it to only pub/sub operations). If you
>> only want to stick to pubsub then it's cool, but then if you are tempted
>> by other things like queues and hashes and operations to watch them,
>> then you have to start having to spawn multiple TCP connections for each
>> watch operation, and then writing connection pools etc. That makes me
>> sad.
>>
>> RabbitMQ is nice in that you can consume all its goods with a single TCP
>> connection.
>>
>> Cheers, James
>>
>> On Wed, Aug 20, 2014 at 11:14:12am +0100, Sleepyfox wrote:
>> > Something that might initially sound a bit weird, but suits small apps
>> > well, is using Redis for it's dirt simple Pub/Sub support. It's
>> > trivially easy to use Redis as a message bus (trivially easy to use
>> > Redis, full stop), and if you're not looking for the last word in
>> > sophistication or scale (in which case something like RabbitMQ is
>> > probably a better bet) it does the job.
>> >
>> > The approach is described in the following article (about Node rather
>> > than Ruby, but you get the picture):
>> >
>> > Fox
>> > --
>> > "What does the @sleepyfox say?"
>> >
>> >
>> > On 20 August 2014 09:23, Klaus Hebsgaard <klaus at hebsgaard.dk> wrote:
>> > > Thanks for the pointer, however there were a few points I didn't put
>> into
>> > > the original request:
>> > > - I need something small, as the app is small
>> > > - I don't mind synchronous event busses, as we don't handle anything
>> big
>> > > yet.
>> > > - I would like some simplicity, so adding more processes to run on the
>> > > server, would be too much overhead at the moment
>> > > - We use MRI at the moment, though I can see lots of advantages to
>> JRuby
>> > >
>> > >
>> > >
>> > > Med Venlig hilsen / Best regards
>> > >
>> > > Klaus Hebsgaard
>> > >
>> > > Website: http://www.hebsgaard.dk
>> > > Blog: http://blog.khebbie.dk
>> > > LinkedIIn: http://www.linkedin.com/in/klaushebsgaard
>> > > Github: https://github.com/khebbie
>> > >
>> > >
>> > > On Wed, Aug 20, 2014 at 9:38 AM, Vish Vishvanath <
>> vish.vishvanath at gmail.com>
>> > > wrote:
>> > >>
>> > >> Hey Klaus,
>> > >>
>> > >> On a slightly different note, I've had very positive experiences
>> with Ruby
>> > >> in vert.x,  which enables excellent decoupling with its system of
>> > >> 'verticles': independent code modules communicating via immutable
>> primitives
>> > >> across an event bus.
>> > >>
>> > >> The fact that you can leverage Java and several languages in the same
>> > >> codebase is a bonus.
>> > >>
>> > >> Best
>> > >>
>> > >> vv
>> > >>
>> > >> On 20 Aug 2014, at 07:42, Klaus Hebsgaard <klaus at hebsgaard.dk>
>> wrote:
>> > >>
>> > >> Hello
>> > >>
>> > >> I am currently looking into decoupling my app a bit more.
>> > >> Coming from a C# background I would like to use an Event Bus for
>> this, so
>> > >> that I can apply the observer pattern.
>> > >>
>> > >> I have searched a bit around and have found:
>> > >> https://github.com/kevinrutherford/event_bus
>> > >>
>> > >> Does anyone know this gem, is it worth using (well maintained etc)?
>> > >> Do you know of good alternatives?
>> > >>
>> > >> Med Venlig hilsen / Best regards
>> > >>
>> > >> Klaus Hebsgaard
>> > >>
>> > >> Website: http://www.hebsgaard.dk
>> > >> Blog: http://blog.khebbie.dk
>> > >> LinkedIIn: http://www.linkedin.com/in/klaushebsgaard
>> > >> Github: https://github.com/khebbie
>> > >>
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