Support full yaml dsl #80

[lburgazzoli]

Fixes #80

This is the first iteration for an YAMLesque DSL so that you can define routes as:

- from:
    uri: "direct:start"
    steps:
     - choice:
         when:
           - simple: "${body.contains(\",\")}"
             steps:
               - to: "log:when-comma"
               - split:
                   tokenize: ","
                   steps:
                    - to: "log:when-semicolon"
           - simple: "${body.startsWith(\";\")}"
             steps:
               - to: "log:when-semicolon"
               - split:
                   tokenize: ";"
                   steps:
                    - to: "log:when-semicolon"
         otherwise:
           steps:
             - to: "log:otherwise"
     - to: "log:info"

- rest:
    verb: "post"
    uri: "/route"
    steps:
     - unmarshal:
         json:
             library: "Jackson"
             unmarshal-type: "my.Pojo"
     - to: "log:info"

The DSL can be extended by providing a "service" like file, see as example the custom step handler for knative here in the pr.

What's left:

• better documentation
• support for additional EIPs

The DSL support also a "flow style" where the inner steps for things such as filter or split can be omitted:

- from:
    uri: "direct:flow"
    steps:
      - split:
          tokenizer: ","
      - to: "mock:flow"

[davsclaus]

Looks really good. Only found cosmetic issues in the comments.

However I do think we should think about the naming of converter as it reminds too much about type converters from Camel. I would like to come up with a new name in the near future.

Really like the groovy testing stuff you do for all the EIPs.

[valdar]

+1 on the converter naming, some proposals:

• StepParser
• StepHandler

[lburgazzoli]

@davsclaus @valdar yeah, the things have originally started as plain jackson converters so named according but it turned out it was not possible to fully marshal/unmarshal steps using standard things.

Any suggestion for a better naming is very welcome.

[lburgazzoli]

ok, working on renaming things to StepParser

@valdar @davsclaus do you mind doing a second review ?

[davsclaus]

Yeah StepParser is better than Converter

[valdar]

👍