Steps to migrate a Spring Web MVC Controller

The Spring Web MVC Controller to be migrated is taken from the previous tutorial:

@RestController
@RequestMapping("/rest")
public class SpringRestController {

	@Autowired
	private SpringDependency dependency;

	@GetMapping
	public ResponseModel get() {
		return new ResponseModel("GET " + this.dependency.getMessage());
	}

	@GetMapping("/path/{param}")
	public ResponseModel path(@PathVariable("param") String param) {
		return new ResponseModel(param);
	}

	@PostMapping("/update")
	public ResponseModel post(@RequestBody RequestModel request) {
		return new ResponseModel(request.getInput());
	}

}

To migrate a Spring Web MVC Controller:

1. Replace the Spring parameter annotations with WoOF annotations.
   • @PathVariable to @HttpPathParameter
   • @RequestParam to @HttpQueryParameter
   • @RequestHeader to @HttpHeaderParameter
   • @CookieValue to @HttpCookieParameter
   • @RequestBody to @HttpObject
2. Remove @ResponseBody and send response object to ObjectResponse parameter rather than returning it.
   • Note that can also continue to return object. This object is then used as a parameter to the next linked procedure.
3. Any @PostContruct / @PreDestroy moved to ManagedObjectSource as injected object.
4. See Transaction Tutorial for configuring transactions via YAML (removing need for Spring's @Transactional).
5. Remove the remaining Spring annotations.
6. Move dependencies to parameters of the method.

The resulting migrated code is as follows:

public class MigratedRestController {

	public void get(SpringDependency dependency, ObjectResponse<ResponseModel> response) {
		response.send(new ResponseModel("GET " + dependency.getMessage()));
	}

	public void path(@HttpPathParameter("param") String param, ObjectResponse<ResponseModel> response) {
		response.send(new ResponseModel(param));
	}

	public void post(RequestModel request, ObjectResponse<ResponseModel> response) {
		response.send(new ResponseModel(request.getInput()));
	}

}