将两种方法合而为一

Question

What's the best method for converting these two methods into one?

@RequestMapping(method = RequestMethod.GET)
    public ResponseEntity<String> dbStatus() {
        return statusService.isDbAlive() ? RESPONSE_DB_UP : RESPONSE_DB_DOWN;
    }

    @RequestMapping(method = RequestMethod.GET)
    public ResponseEntity<String> appStatus() throws IOException {
        return statusService.isAppAlive() ? RESPONSE_APP_UP : RESPONSE_APP_DOWN;
    }

Could I return a List of ResponseEntity<String> ?

Answer 1

You would have to return something like JSON showing the result of both checks. For example

{"isAppAlive" : true, "isDbAlive": false}

You can build this JSON string yourself

@RequestMapping(method = RequestMethod.GET)
public ResponseEntity<String> getStatus() throws IOException {
    String json = "{\"isAppAlive\":" + statusService.isAppAlive() + ",\"isDbAlive\""+ statusService.isDbAlive() +"}";
    return new ResponseEntity<String>(json, HttpStatus.OK);
}

Or build a class like

public class Status {
    // use private and getters/setters
    public boolean isAppAlive;
    public boolean isDbAlive; 
}

and let Spring serialize the Status object you create

@RequestMapping(method = RequestMethod.GET)
public ResponseEntity<Status> getStatus() throws IOException {
    Status status = new Status();
    status.isAppAlive = statusService.isAppAlive();
    status.isDbAlive = statusService.isDbAlive();
    return new ResponseEntity<Status>(status, HttpStatus.OK);
}

You can always make statusService have a method getStatus() that returns a Status object that already has its fields set already.

Your client can then parse the JSON and check each status.

Answer 2

  @RequestMapping(value = "/testurl",
       method = { RequestMethod.GET, RequestMethod.POST })
  public ModelAndView dbStatus() {

             List<String>  status = new ArrayList<String>();
             status.add (statusService.isDbAlive() );
             status.add (statusService.isAppAlive() );
             ModelMap modelMap = new ModelMap();
             modelMap.put("status ", status );
             return new ModelAndView("statuspage.jsp", modelMap);

  }