api-gateway

• add custom/dummy health check endpoint for testing of spring cloud config + spring cloud bus for dynamic config change

1. create a controller with two annotations - @RestController, @RefreshScope

   @Value("${health-check.enabled}") private boolean hcIndicator;

   @GetMapping("/health-check") public Map<String, Object> healthCheck() { Map<String, Object> response = new HashMap<String, Object>();

    if (hcIndicator) {
        response.put("health-check.status", "running");
    } else {
        response.put("health-check.enabled", hcIndicator);
    }
   
    return response;
   

   }

2. add config in config file: api-gateway-dev.yml -> health-check.enabled: false

3. start two app using different ports, eg. 8080 and 8081

4. use postman to test it, http:localhost:8080/health-check, response is

health-check.enabled: false

5. update health-check.enabled: true and check in to git repo
6. send a post request to http://localhost:8080/actuator/refresh
7. then test #4 on these two endpoints, you will get same response,

health-check.status: running

that mean even refresh the config on one endpoint, spring cloud bus will help to cascade the update to all registerred client through Message Queue