Codenameone: How to stop XFClient findAndWait request when network exception occurs so the calling thread can progress?

问题

My CN1 app uses XFClient to communicate with mySQL database on a server running Xataface. The timer thread calls XFClient's findAndWait method and then sleeps 1 second before repeating. It works well 99+% of the time but sometimes the app encounters a network problem (Bad Gateway, ConnectionExceptions, SocketTimeOutException, etc.) and stops communicating with the server because findAndWait keeps waiting in spite of the exception. Is there a way for findAndWait to stop waiting when an exception occurs?

Here’s what I’ve tried so far:

comsume the error. This suppresses the error message to the user but the findAndWait keeps waiting
Request.setTimeout(5000) to kick out after 5 secs (based on SocketTimeoutException in CodeNameOne build on Android device) . No effect. The findAndWait keeps waiting. Tried this at the NetworkManager and at the request level.

In handleException for NetworkManager, added code below (based on https://github.com/codenameone/CodenameOne/issues/733). It compiled and ran but findAndWait kept waiting.

    NetworkManager.getInstance().addErrorListener(new ActionListener() {

        @Override
        public void actionPerformed(ActionEvent evt) {
            System.out.println("got a network error.  will kill the connect request and consume it.");
            if (theXFClient.getcRMP() != null) {
            NetworkManager.getInstance().killAndWait(theXFClient.getcRMP());
            }
            evt.consume();
        }
    });

I’m running this on the simulator, launching the app and then triggering the problem by disabling the network connection in the simulator menu. I was hoping the timer thread would carry on when I turn back on the network connection but it is still stalled.

BTW - When the app is paused and resumed via the simulator menu (and real devices), the timer picks up right where it left off. Hoping we can figure out a way that it can do that when network glitches happen as well.

Thx, Mike

回答1:

I have just added timeout and read timeout support that can be set on both the XFClient class and the XFQuery class. If both XFClient and XFQuery for a particular query specify a timeout, then the XFQuery timeout will take precedent.

This update will be in Codename One settings soon, but you can download this new build directly right now from here

来源：https://stackoverflow.com/questions/61647990/codenameone-how-to-stop-xfclient-findandwait-request-when-network-exception-occ

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