[GitHub] [incubator-dubbo] chickenlj opened pull request #3847: Async optimization, altanative to #3738.

["chickenlj (GitHub)" <gi...@apache.org>]

## What is the purpose of the change

This pull request tries a different approach for achieving the same goal as #3738 by having Result extends CompletionStage and Future directly.

After finishing the code in this pull request, I strongly suggest using the way in #3738. Here are some drawbacks I found doing this PR:
1.  CompletionStage is not convenient enough when programming, most of the time you will need CompletableFuture, but because Result itself is an Interface and most of the method uses Result instead of concrete Result class so you will only be able to interact with CompletionStage.
2. We only need very few callback methods provided by CompletionStage

## Brief changelog

XXXXX

## Verifying this change

XXXXX

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[ Full content available at: https://github.com/apache/incubator-dubbo/pull/3847 ]
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[GitHub] [incubator-dubbo] chickenlj closed pull request #3847: Async optimization, altanative to #3738.

["chickenlj (GitHub)" <gi...@apache.org>]

[ pull request closed by chickenlj ]

[ Full content available at: https://github.com/apache/incubator-dubbo/pull/3847 ]
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