Allow global filters by spring properties

[codefromthecrypt]

My demo is only waiting one feature before it is perfect (in my opinion). I don't want to have to use dubbo.properties to specify a filter. I want spring properties to do that, as the options are more flexible.

Concretely, I want to move from dubbo.properties:

dubbo.provider.filter=tracing
dubbo.consumer.filter=tracing

into application.properties

spring.dubbo.provider.filter=tracing
spring.dubbo.consumer.filter=tracing

I think this can be done by adding nested class for consumer and provider to DubboProperties, then processing it like other things are. It can be as simple as only handling filter attribute for now (not doing other things that are supported in xml or dubbo.properties)

Do you feel this is ok?

[codefromthecrypt]

here's example showing this feature last thing missing https://github.com/openzipkin/sleuth-webmvc-example/compare/add-dubbo-tracing

[xionghuiCoder]

Hi, we will consider to support it in version 1.0.3.

And in this version, we can use filter by hard-coding or annotation without dubbo.properties, for example: provider: System.setProperty("dubbo.provider.filter", "tracing"); or @Service(interfaceClass = Api.class, registry = "N/A", filter = "tracing")

consumer: System.setProperty("dubbo. consumer.filter", "tracing"); or @Reference(url = "dubbo://127.0.0.1:9000", filter = "tracing") Api api;