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From khanimteyaz (GitHub) <git...@apache.org>
Subject [GitHub] [incubator-dubbo] khanimteyaz commented on issue #3095: remove @Async from core framework.
Date Sat, 29 Dec 2018 15:35:28 GMT
> @khanimteyaz Thanks for your attention, I will try to explain.
> As you may have noticed, we support a service definition with a CompletableFuture as
the return type.
> ```java
> public interface AsyncService {
>     CompletableFuture<String> sayHello(String name);
> }
> ```
> But this is newly introduced in 2.7.0, which means, there would be many legacy services
that can not leverage this feature. Because if they change the service definition (the interface
definition) they will have to reimplement their service to meet the new definition.
> For example, here is a typical service definition before 2.7.0
> ```java
> public interface GreetingsService {
>     String sayHi(String name);
> }
> ```
> To be able to call this service asynchronously, they have to use `RpcContext` to get
the `Future`, like this:
> ```java
> // the invoke will return null immediately
> greetingsService.sayHi("world");
> // get the Future instance, the future will get notified once the result returns.
> Future<String> future = RpcContext.getContext().getFuture();
> ```
> Annotation @AsyncFor is a mechanism I introduced to simplify the process for those legacy
services, you can refer to [here](https://github.com/dubbo/dubbo-async-processor/tree/deprecated-processer)
for how it works.
> But now, as long as I realized we have supported java 8, we can use the default method
to avoid generating a new class. [Here](https://github.com/dubbo/dubbo-async-processor/blob/master/README.md)
is the new way I have come up with, this is what mean by saying `move the @AsyncFor from core
to side project '. This way, this would become a convenient solution we provide but not a
mandatory solution provided in core.

  @chickenlj Thanks a lot for the details. Appreciate it.

  I will give a look into this PR.

[ Full content available at: https://github.com/apache/incubator-dubbo/pull/3095 ]
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