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J2EE -- Handling HttpSession session timouts while serving flash content

Answer 1

+1 A:

Is the flash video embedded in an HTML page? If so, perhaps you could have an AJAX call on the page that periodically sends a "heartbeat" to the server to keep the session alive.

Kevin 2010-02-18 16:18:02

Here is a good explanation: http://ajaxpatterns.org/Heartbeat

Aito 2010-02-18 16:31:35

Answer 2

A:

Rather fire ajax polls in the background.

Here's an SSCCE with a little help of jQuery. Just copy'n'paste'n'run it (and change the flash object to suit your actual code).

<!doctype html>
<html lang="en">
    <head>
        <title>SO question 2290101</title>
        <script src="http://code.jquery.com/jquery-latest.min.js"&gt;&lt;/script&gt;
        <script>
            $(document).ready(function() {
                setInterval(function() {
                    $.get('poll');
                }, ${(pageContext.session.maxInactiveInterval - 10) * 1000});
            });
        </script>
    </head>
    <body>
        <object type="application/x-shockwave-flash" ... >
            ...
        </object>
    </body>
</html>

Here ${pageContext.session.maxInactiveInterval} returns the remnant of seconds the session has yet to live (and is been a tad shortened -just to be in time with poll- and converted to milliseconds so that it suits what setInterval() expects). The $.get('poll') should call a servlet which is mapped on an url-pattern of /poll and contains basically the following line in the doGet() method.

request.getSession(); // Keep session alive.

That's it.

BalusC 2010-02-18 17:56:15

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J2EE -- Handling HttpSession session timouts while serving flash content

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