Spring: howto show log messages to the user? - spring

Question

In my Spring/Hibernate/MVC application I implement some long running functions. In this case I would like to inform the user about the status.
I wonder, if I can get certain log4j messages to the frontend, like:
DEBUG d.t.webapp.services.StageServiceImpl - Fetching result
DEBUG d.t.webapp.services.StageServiceImpl - loaded 1000 rows
DEBUG d.t.webapp.services.StageServiceImpl - loaded 1000 rows
DEBUG d.t.webapp.services.StageServiceImpl - loaded 1000 rows
DEBUG d.t.webapp.services.StageServiceImpl - loaded 994 rows
Those message should appear to the frontend step-by-step, as they are produced by the backend, with minimal delay. Is that possible or are there better solutions for this requirement?

Answer 1

Or why not just use something like this:
1# Create a controller to provide you with last status of your worker
#RestController
#RequestMapping(value = "/worker")
public WorkerStatusProviderController {
#Autowired
WorkerStatusProvider workerStatusProvider;
#RequestMapping(value = "/status/{id}", method = RequestMethod.GET)
public new ResponseEntity<WorkerStatus> getStatus(#PathVariable("id") long workerId){
//retrieve last worker status
WorkerStatus lastStatus = workerStatusProvider.getLastStatus(workerId);
//send worker status to front
return new ResponseEntity<WorkerStatus>(lastStatus, HttpStatus.OK);
}
}
2# In frontend use Ajax to call this controller every 2 or 3 seconds and display the last status to your user.
//call /worker/status/id every 2 seconds
setInterval(function(){
$.get("/worker/status/100", function(workerStatus, status) {
//display worker status to the user
alert("workerStatus: " + workerStatus);
});
}, 2000);