Design pattern for callback hell in Vert.x 3

[poiuytrez]

Hello, 

I am writing a web application. I am currently writing a module which:

1. load a first file (blocking)

2. based on this results, load a second file (blocking)

What is the is best way to handle this chain of callbacks? Should I call 2 times vertx.executeBlocking?

Thank you for your help.

PS : I have never used Vert.x 2

[Tim Fox]

On 18/06/15 16:19, poiuytrez wrote:

Hello, 

I am writing a web application. I am currently writing a module which:

1. load a first file (blocking)

2. based on this results, load a second file (blocking)

What is the is best way to handle this chain of callbacks? Should I call 2 times vertx.executeBlocking?

If they're both blocking why not just put 1 and 2 in the same executeBlocking block?

Or you could use a worker verticle.

Thank you for your help.

PS : I have never used Vert.x 2

--
You received this message because you are subscribed to the Google Groups "vert.x" group.
To unsubscribe from this group and stop receiving emails from it, send an email to vertx+un...@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

[Ronald van Raaphorst]

Have a look at the Java CompletableFutures. You can define several futures, complete them when you're done and then continue with the next future, or wait untill several futures are all completed.

[Guillaume Charhon]

Interesting.

--
You received this message because you are subscribed to a topic in the Google Groups "vert.x" group.
To unsubscribe from this topic, visit https://groups.google.com/d/topic/vertx/WOotux-bL8k/unsubscribe.
To unsubscribe from this group and all its topics, send an email to vertx+un...@googlegroups.com.

[Assen Todorov]

Hi,

Look at this  -> https://github.com/baldinsystems/vertx-composition-example
Not really pattern, but this way you could execute chain of verticles without the callback hell ;-)

[poiuytrez]

Some documentation written in August with Vert.x using CompletableFutures:

http://qrman.github.io/posts/2015/08/28/callback_hell_completablefuture_ftw/

[Ronald van Raaphorst]

You can also use the vertx-sync / quasar fibers to write non blocking async code. See http://vertx.io/docs/vertx-sync/java/

On Thursday, June 18, 2015 at 5:19:59 PM UTC+2, poiuytrez wrote: