Return @Async method leads to Spring MVC and returns it to the Ajax client

Question

I have some method inside my controller that does the task @Async

@Async
public Future<String> getResultFromServer(){
    String result = ......
    return new AsyncResult<String>(result);
} 

The execution time of the method is up to 1 minute. All I need to do is simply return the result to the client side, which will be connected using AJAX / JQuery.

I do not want the client to request my server every second, regardless of whether the method was executed @Asyncor not. I just want my connection to open, and then just “push” the result to the server.

@RequestMapping(value="/async.do", method=RequestMethod.POST)
public void getResult(HttpServletResponse res){
    String result = null;
    PrintWriter out = res.getWriter();
    Future<String> future = getResultFromServer();
    try {
        if (future.isDone())
            result = future.get();
        out.println(result);
        out.close();
    } catch (InterruptedException e) {
        e.printStackTrace();
    } catch (ExecutionException e) {
        e.printStackTrace();
    }
}

I understand that this is very close to the Comit model, but I am not familiar with comets in general.

My question is, how can I open a client-side connection using JavaScript / JQuery?

and my method @RequestMapping(value="/async.do", method=RequestMethod.POST)pushes the result to the client?

Answer 1

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