5A.Serivce Provider

Use SpringMvc annotations to provide services and cowork with WebMvc.

5A.1.Provider Convention

• Pure interface and pojo definition the contract to avoid Overloading, e.g. HelloContract
• SchemaId and path are kebab-case, i.e. lowercase hyphens
• Contractor @RestSchema implements the contract, such as HelloContractor
• Overloading methods are identified by different suffixes, path is globally unique
• Use only @RestSchema, disable scanning of @RestController

5A.2.DataType Convention

Data type follow the Json convention of Wings to avoid using complex types and structures.

When pure String is used as body, both Request's consumes and Response's produces must use MediaType.TEXT_PLAIN_VALUE, which is different from Spring.

5A.3.Contract Style

The contract is available in both Mvc and Rpc styles, both of which can be easily located and understood.

3a.Mvc Style, Root is BasePath

Consistent with the Controller and RequestMapping conventions in wings.

• The basePath on the class is / or /v1, i.e. root path or version
• @RequestMapping of the method is the full path, starting with SchemaId.

@RestSchema(schemaId = "batrider-hello")
@RequestMapping(path = "/")
public class BatriderContractor implements HelloContract {

    @RequestMapping(path = "/batrider-hello/say-hello", 
    method = RequestMethod.GET, produces = MediaType.TEXT_PLAIN_VALUE)
    @ResponseBody
    @Override
    public String sayHello(@RequestParam(name = "name") String name) {
        return "Batrider: Hello " + name;
    }
}

3b.Rpc Style, SchemaId is basePath

Easier to locate by IDE association, placing the SchemaId in the contract interface

public interface HelloContract {
    String SchemaId = "winx-hello";
    String sayHello(String name);
}

In the implementation, the provider uses the contract's SchemaId directly

@RestSchema(schemaId = HelloContract.SchemaId)
@RequestMapping(path = HelloContract.SchemaId)
public class HelloContractor implements HelloContract {

    @RequestMapping(path = "/say-hello", 
    method = RequestMethod.GET, produces = MediaType.TEXT_PLAIN_VALUE)
    @ResponseBody
    @Override
    public String sayHello(@RequestParam(name = "name") String name) {
        return "Winx: Hello " + name;
    }
}