add 'spring.config.intergration-location' with 'classpath*:' support

[stategen]

This new feature add a lowest arg spring.config.intergration-location with value 'classpath*:' support.
In some cases, we integrate jars with an uncertain number, such as message subscribers. This new feature can make message sending truly dynamic and zero configuration for providers

[pivotal-issuemaster]

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[pivotal-issuemaster]

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[philwebb]

Thanks for the pull-request, but this is quite a substantial set of changes and we won't be able to apply them in their current form. We have an open issue (#24688) to discuss the idea of jars contributing additional properties, could you please add your use-case to that issue.

There's a lot of potential gotchas with adding wildcard imports so we're taking some time to think about the design.

[stategen]

thanks for your replies, my case is as this :

project B is the spring-stream consumer recieves mq from project A

    classpath:/sink/B/application.yml:
    spring.cloud.stream:
        function.definition: supplier;methodB1;methodB2...n;
        bindings:
            methodB1-in-0.destination: methodB1-dest
            methodB2-in-0.destination: methodB2-dest
            ...
            methodBn-in-0.destination: methodBn-dest

project C is the spring-stream consumer recieves mq from project A

    classpath:/sink/C/application.yml:
    spring.cloud.stream:
        function.definition: supplier;methodC1;methodC2...n;
        bindings:
            methodC1-in-0.destination: methodC1-dest
            methodC2-in-0.destination: methodC2-dest
            ...
            methodCn-in-0.destination: methodCn-dest
    ...       

project N is the spring-stream consumer recieves mq from project A

project A's config will sync manual summary with B,C...N'config like below:

    classpath:/application.yml:
    spring.cloud.stream:
        function.definition: methodB1;methodB2...n,methodC1;methodC2...n,...methodN1;methodN2...n;
        bindings:
            methodB1-in-0.destination: methodB1-dest
            methodB2-in-0.destination: methodB2-dest
            ...
            methodBn-in-0.destination: methodBn-dest

            methodC1-in-0.destination: methodC1-dest
            methodC2-in-0.destination: methodC2-dest
            ...
            methodCn-in-0.destination: methodCn-dest            
    ...  

the work is hard,hard,hard and never stable,never never never stop!

Now Now Now with my this update. project B ,C,...N only facade a itself jar with config as below

--spring.config.intergration-location=classpath*:/sink/*/[application.yml] 
//rule: lowest order and can be overrided by any, not care conflicts,not overrides higher value, limit 2 wildcards ,endswith '*/' or file and filtered by /sink/ ,so not slow,
    classpath:/sink/N/application.yml: 
    spring.cloud.stream:
        function.map: 
           methodN1: true
           methodN2: true
           ...
           methodN2: true
        bindings:
            methodN1-in-0.destination: methodN1-dest
            methodN2-in-0.destination: methodN2-dest
            ...
            methodNn-in-0.destination: methodNn-dest 
    auto join spring.cloud.stream.function.map's keySet as it's onwer spring.cloud.stream.function.definition     
project A do nothing but hold the arg,
--spring.config.intergration-location=classpath*:/sink/*/[application.yml] 

auto join or plus spring.cloud.stream.function.map's keySet as it's onwer spring.cloud.stream.function.definition
project A can override classpath*:/sink/*/[application.yml] configs any time,any way.

Perfect!

[stategen]

@philwebb ，the github'editor musk some chars or changed the style I typed，if need ，i can create a demo from my real from my real projects?

[philwebb]

@stategen I tried to edit your comment. Take a look at https://guides.github.com/features/mastering-markdown/ for instructions on how to format your comments. I think a sample would certainly help.

[stategen]

@philwebb ,nice format!