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Spring code example with a large number of characters?

I can find a lot of information about how Long Polling works (for example, this and this), but there are no simple examples of how to implement this in code.

Basically, how can I use Apache Tomcat to serve requests and how to write a simple (spring) application that will be a "long poll" of the server for new messages?

An example doesn't have to be scalable, secure or complete, it just needs to work! I would appreciate it if someone could give me such a textbook or turn to another.

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2 answers

Here is the simplest example I can come up with ...

In the controller:

@RequestMapping("/longPolling")
public String longPolling(Model model) {
  while(true) {
    // .. Do something, break when done...
    if( somethingIsDone ) {
       break;
    }
  }
  return "someResponse";
}

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@RequestMapping("/longPolling")
public Future<String> longPolling(Model model) {
  return callSomethingWhereAFutureReturns();
}

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