Codenameone:如何在发生网络异常时停止XFClient findAndWait请求，以便调用线程可以继续进行? [英] Codenameone: How to stop XFClient findAndWait request when network exception occurs so the calling thread can progress?
问题描述
我的CN1应用程序使用XFClient与运行Xataface的服务器上的mySQL数据库进行通信.计时器线程调用XFClient的findAndWait方法，然后在重复之前睡眠1秒钟.它可以在99％以上的时间中正常运行，但是有时应用程序遇到网络问题(错误的网关，ConnectionExceptions，SocketTimeOutException等)并停止与服务器通信，因为尽管有异常，但findAndWait仍在等待.发生异常时，findAndWait是否可以停止等待?
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?
这是到目前为止我尝试过的事情:
Here’s what I’ve tried so far:
- 使用该错误.这样可以避免向用户显示错误消息但是findAndWait一直在等待
- Request.setTimeout(5000)在5秒后开始播放(基于在Android设备上构建的CodeNameOne中的SocketTimeoutException ).没有效果.findAndWait一直在等待.在NetworkManager和请求级别对此进行了尝试.
-
在NetworkManager的handleException中，在下面添加了代码(基于 https://github.com/codenameone/CodenameOne/issues/733 ).它编译并运行，但是findAndWait一直在等待.
- 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();
}
});
我正在模拟器上运行此程序，启动应用程序，然后通过在模拟器菜单中禁用网络连接来触发问题.我希望当我重新打开网络连接时，计时器线程能够继续运行，但是它仍然停滞.
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.
顺便说一句-当应用程序通过模拟器菜单(和实际设备)暂停并恢复时，计时器从上次停止的地方开始计时.希望我们能找到一种方法，在发生网络故障时也能做到这一点.
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，迈克
推荐答案
我刚刚添加了可以在XFClient类和XFQuery类上设置的超时和读取超时支持.如果特定查询的XFClient和XFQuery都指定了超时，则XFQuery超时将优先.
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.
此更新即将在Codename One设置中进行，但是您现在可以直接从此处
This update will be in Codename One settings soon, but you can download this new build directly right now from here
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