1:35 p.m.
Talking with a colleague about this he reminded me of an important fact I almost forgot.
The CompletableFuture API can actually be used with custom executors. That means users
concerned about managed threads in a Java EE environment can use it with existing EE 7
concurrency executors.
Basically this means CompletableFutures are already pretty Java EE ready.
If this is the main cited reason for using CompletionStage, is it really that valid of an
argument to justify yet another custom subclass specific only to CDI instead of what's
likely to be far more familiar and expected?
On Mar 7, 2016, at 8:11 AM, Reza Rahman <reza_rahman(a)lycos.com>
wrote:
I think this is a very bad idea. It's better not to use either API and wait to sort
out how CompletableFuture can be used in EE consistently. Because of backwards
compatibility rules, it is better to have no API than a bad API.
> On Mar 7, 2016, at 3:45 AM, Romain Manni-Bucau <rmannibucau(a)gmail.com> wrote:
>
> 2016-03-07 9:07 GMT+01:00 Martin Kouba <mkouba(a)redhat.com>:
>>
>> Dne 7.3.2016 v 09:03 Romain Manni-Bucau napsal(a):
>>>
>>> Le 7 mars 2016 08:35, "Martin Kouba" <mkouba(a)redhat.com
>>> <mailto:mkouba@redhat.com>> a écrit :
>>> >
>>> > Dne 6.3.2016 v 15:39 Romain Manni-Bucau napsal(a):
>>> >
>>> >> Hi guys,
>>> >>
>>> >> as a user having a ComlpetionStage makes me loose some JDK
utilities,
>>> >> can we move back to CompletionFuture?
>>> >>
>>> >> It would allow for instance:
>>> >>
>>> >> // doesn't work with CompletionStage
>>> >> CompletionFuture.allOf(event1.fireAsync(...),
event2.fireAsync(...))
>>> >> .then(...)
>>> >
>>> >
>>> > Well, this should work if the underlying CompletionStage impl
>>> supports toCompletableFuture(), i.e. in Weld 3:
>>> >
>>>
>>> Yes but it is not natural to convert it IMO = we can do better
>>>
>>> > CompletableFuture.allOf(event1.fireAsync(...).toCompletableFuture(),
>>> event2.fireAsync(...).toCompletableFuture())
>>> >
>>> > AFAIK the default async execution facility of CompletableFuture is
>>> ForkJoinPool.commonPool() which is not a good fit for Java EE. Using the
>>> CompletionStage interface allows us to wrap the async calls without the
>>> specified executor (e.g. CompletionStage.thenApplyAsync(Function<? super
>>> T, ? extends U>)) and supply a default one provided by the impl.
>>> >
>>>
>>> Should use the pool in which the evznt is fired then "then step"
is
>>> synchronous is my sample so all is decided at fire time
>>
>> I don't talk about your particular example - I understand that it's not
using async exec (although the "then()" method does not exist).
>
> was supposed to represent the different flavours (thenRun, thenCompose, ...) ;).
>
> That said I agree on the state switching the pool is better but with these 2 notes:
>
> - could be better to hide these poorly designed methods then -> don't use
CompletionXXX but a CDI API with a bridge to CompletionX to let the user go back on SE
tools
> - we still don't have a *standard* config for the pool(s) underlying CDI features
so it sounds as poor as SE solution IMO (at least a core/max/ttl config in beans.xml)
>
>>>
>>> >
>>> >>
>>> >> Romain Manni-Bucau
>>> >> @rmannibucau <https://twitter.com/rmannibucau> | Blog
>>> >> <http://rmannibucau.wordpress.com> | Github
>>> >> <https://github.com/rmannibucau> | LinkedIn
>>> >> <https://www.linkedin.com/in/rmannibucau> | Tomitriber
>>> >> <http://www.tomitribe.com>
>>> >>
>>> >>
>>> >>
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>>> >>
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>>> >>
>>> >
>>> > --
>>> > Martin Kouba
>>> > Software Engineer
>>> > Red Hat, Czech Republic
>>
>> --
>> Martin Kouba
>> Software Engineer
>> Red Hat, Czech Republic
>
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