Future.complete() not blocking

[Piero dS]

This code does not block and just goes through:

Future<String> f = Future.future();
       
f.result();


How do I know when my future is complete then if result() does not block before Future.complete() is called?

[Thomas SEGISMONT]

Vert.x futures are not Java futures. You need to call setHandler to register a callback. This is how you get notified of completion.

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[Clement Escoffier]

Hi,

Yes, Vert.x futures are not blocking. You need to attach a handler called when the future is completed (successfully or not):

Future<String> f = Future.future();

f.setHandler(ar -> {

  if (ar.failed()) {

    Throwable cause = ar.cause(); => the failure

  } else {

   String result = ar.result();

});

Then, later in the code, you will do something like:

f.complete(“Hello”); 

or

f.fail(“my bad !”); // or f.fail(exception);

Clement

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[Piero dS]

:) thanks

On Wednesday, September 28, 2016 at 6:45:40 PM UTC+2, Thomas Segismont wrote:

Vert.x futures are not Java futures. You need to call setHandler to register a callback. This is how you get notified of completion.

2016-09-28 18:41 GMT+02:00 Piero dS <dslp...@gmail.com>:

This code does not block and just goes through:

Future<String> f = Future.future();
       
f.result();


How do I know when my future is complete then if result() does not block before Future.complete() is called?

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[Piero dS]

Two more questions...

1 what is a completer?
2 how do you pass the result of a Future to the next Future?

Thanks

[Thomas SEGISMONT]

2016-09-29 12:09 GMT+02:00 Piero dS <dslp...@gmail.com>:

Two more questions...

1 what is a completer?

It's explained in the doc: http://vertx.io/docs/vertx-core/java/#_sequential_composition

"You can use completer that completes a future with the operation result or failure. It avoids having to write the traditional: if success then complete the future else fail the future."

 

2 how do you pass the result of a Future to the next Future?

In the doc again: http://vertx.io/docs/vertx-core/java/#_sequential_composition

You might also have a look at Future#map to transform the data

 

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