Hi, @freeseawind
This is a good issue, thx for your issue first. :)
I think the reason for the SPI value is not necessarily required: First, the
meaning of the SPI value is "default extension name", we should allow classes
with no default extensions (ex: Merger, RouterFactory, ChannelHandler, etc.).
Second, there is no need, because with @Adaptive annotations, we can still
specify an extension implementation.
A doc can be found at @Adaptive annotation:
If default extension's name is not give on interface's {@link SPI}, then a name
is generated from interface's class name with the...
Explain that the value of spi itself is designed to be non-required.
The above is my opinion.
[ Full content available at:
https://github.com/apache/incubator-dubbo/issues/2398 ]
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