christophe blin wrote:
> Hi,
>
> I'd like to cancel a servlet request if it took more than 5 seconds.
>
> ATM, I know this is not possible directly via a tomcat configuration (in
> fact I found no servlet container with this option).
> By googling and doing a lot of tries (mainly based on
> http://marc.info/?l=tomcat-user&m=109463824530983&w=2) , I find the
> following snippet to be working but I have some problems with it.
Are you really sure you want to kill a request after 5 seconds?
Do you mean 5 seconds after the connection is opened, or 5 seconds after
the response has begun?
The properties of the http connector element in server.xml allow you to
configure the former, but I'd strongly advise against doing so:
connectionTimeout="5"
See: http://tomcat.apache.org/tomcat-6.0-doc/config/http.html
I can't think of reason why you'd want to interrupt the *response* after
5 seconds, but if you do, then you probably need to run whichever job is
problematic inside a Thread that you interrupt after 5 seconds.
Can you elaborate on the reason behind this requirement?
p
> 1/ it use the deprecated Thread.stop method but I do not know if there is a
> way to use interrupt or any safer mecanism
>
> 2/ I do not know if this is really the best way to achieve what I want so if
> you have some pointers, do not hesitate to give them to me.
>
> thanks,
>
> chris
>
> [code]
> public class InterruptFilter implements Filter {
> public void init(FilterConfig arg0) throws ServletException {
> }
>
> public void destroy() {
> }
>
> public void doFilter(ServletRequest request, ServletResponse response,
> FilterChain fc) throws IOException, ServletException {
> InterruptTimer mTimer = new InterruptTimer(5000, 10,
> Thread.currentThread());
> mTimer.start();
> fc.doFilter(request, response);
> mTimer.reset();
> }
>
> public class InterruptTimer extends Thread {
> long oEndTime = 0;
> int oSleepTime = 10;
> Thread oStartingThread = null;
>
> public InterruptTimer(int aLength, int aSleepTime, Thread
> aStartingThread) {
> // Both times are in ms
> oSleepTime = aSleepTime;
> oEndTime = System.currentTimeMillis() + aLength;
> oStartingThread = aStartingThread;
> }
>
> public void run() {
> // Loop until the end time is reached or reset() was called.
> while (System.currentTimeMillis() < oEndTime) {
> try {
> Thread.sleep(oSleepTime);
> } catch (InterruptedException ex) {
> }
> }
> if (oEndTime > 0) {
> timeout();
> }
> }
> public void reset() {
> oEndTime = 0;
> }
>
> public void timeout() {
> System.out.println("**************** stop the request thread");
> oStartingThread.stop();
> }
> }
> }
>
> [/code]
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