Hi Jean-Noël, To add a global error handling to your application, I would suggest that you create an ErrorHandler Class that does all the error handling and sends the error reports to your server. The instance of the class would register an error handler to the qx.event.GlobalError:
qx.event.GlobalError.setErrorHandler(this.__globalErrorHandler, this);
The error handler would do something like this:
__globalErrorHandler : function(exc) {
qx.log.Logger.error(this, exc.getSourceException()); // I guess the exception
is not wrapped in 1.0 - the exc would be the system exception
// or you can use this
// qx.log.Logger.error(this,
qx.dev.StackTrace.getStackTraceFromError(exc.getSourceException()));
var events = ringBuffer.getAllLogEvents();
var jsonLog = qx.util.Json.stringify(events);
ringBuffer.clearHistory();
// Send the error to a server instead of the console log
console.log(jsonLog);
}
I suggest you use a ringBuffer for the Logger, to save memory usage when the
application is running for a long time.
Here is the playground code:
// Create a button
var button1 = new qx.ui.form.Button("Give me an error",
"icon/22/apps/internet-web-browser.png");
// Document is the application root
var doc = this.getRoot();
// Add button to document at fixed coordinates
doc.add(button1,
{
left : 100,
top : 50
});
var ringBuffer = new qx.log.appender.RingBuffer();
qx.log.Logger.register(ringBuffer);
button1.addListener("execute", function(e) {
throw new Error("I am an evil error");
}, this);
var globalErrorHandler = function(exc) {
qx.log.Logger.error(this, exc.getSourceException());
// or you can use this
// qx.log.Logger.error(this,
qx.dev.StackTrace.getStackTraceFromError(exc.getSourceException()));
var events = ringBuffer.getAllLogEvents();
var jsonLog = qx.util.Json.stringify(events);
ringBuffer.clearHistory();
// Send the error to a server instead of the console log
console.log(jsonLog);
};
qx.event.GlobalError.setErrorHandler(globalErrorHandler, this);
// Alternative to add error handling
/*
var handleExecute = qx.event.GlobalError.observeMethod(function(e) {
throw new Error("I am an evil error");
});
*/
/*
var handleExecute = function(e) {
throw new Error("I am an evil error");
};
*/
// Add an event listener
/*
button1.addListener("execute", handleExecute, this);
*/
Here is the link to the playground:
http://demo.qooxdoo.org/devel/playground/#%7B%22code%22%3A%20%22%252F%252F%2520Create%2520a%2520button%250Avar%2520button1%2520%253D%2520new%2520qx.ui.form.Button%28%2522Give%2520me%2520an%2520error%2522%252C%2520%2522icon%252F22%252Fapps%252Finternet-web-browser.png%2522%29%253B%250A%250A%252F%252F%2520Document%2520is%2520the%2520application%2520root%250Avar%2520doc%2520%253D%2520this.getRoot%28%29%253B%250A%250A%252F%252F%2520Add%2520button%2520to%2520document%2520at%2520fixed%2520coordinates%250Adoc.add%28button1%252C%250A%257B%250A%2520%2520left%2520%253A%2520100%252C%250A%2520%2520top%2520%2520%253A%252050%250A%257D%29%253B%250A%250A%250Avar%2520ringBuffer%2520%253D%2520new%2520qx.log.appender.RingBuffer%28%29%253B%250Aqx.log.Logger.register%28ringBuffer%29%253B%250A%250A%250Abutton1.addListener%28%2522execute%2522%252C%2520function%28e%29%2520%257B%250A%2520%2520throw%2520new%2520Error%28%2522I%2520am%2520an%2520evil%2520error%2522%29%253B%250A%257D%252C%2520this%29%253B%250A%250A%250Avar%2520globalErrorHandler%2520%253D%2520function%28exc%29%2520%257B%250A%2520%2520qx.log.Logger.error%28this%252C%2520exc.getSourceException%28%29%29%253B%250A%2520%2520%252F%252F%2520or%2520you%2520can%2520use%2520this%250A%2520%2520%252F%252Fqx.log.Logger.error%28this%252C%2520qx.dev.StackTrace.getStackTraceFromError%28exc.getSourceException%28%29%29%29%253B%250A%2520%2520var%2520events%2520%253D%2520ringBuffer.getAllLogEvents%28%29%253B%250A%2520%2520var%2520jsonLog%2520%253D%2520qx.util.Json.stringify%28events%29%253B%250A%2520%2520ringBuffer.clearHistory%28%29%253B%250A%2520%2520%252F%252F%2520Send%2520the%2520error%2520to%2520a%2520server%2520instead%2520of%2520the%2520console%2520log%250A%2520%2520console.log%28jsonLog%29%253B%250A%257D%253B%250A%250Aqx.event.GlobalError.setErrorHandler%28globalErrorHandler%252C%2520this%29%253B%250A%250A%250A%250A%252F%252F%2520Alternative%2520to%2520add%2520error%2520handling%250A%250A%250A%252F*%250Avar%2520handleExecute%2520%253D%2520qx.event.GlobalError.observeMethod%28function%28e%29%2520%257B%250A%2520%2520throw%2520new%2520Error%28%2522I%2520am%2520an%2520evil%2520error%2522%29%253B%250A%257D%29%253B%250A*%252F%250A%250A%252F*%250Avar%2520handleExecute%2520%253D%2520function%28e%29%2520%257B%250A%2520%2520throw%2520new%2520Error%28%2522I%2520am%2520an%2520evil%2520error%2522%29%253B%250A%257D%253B%250A*%252F%250A%250A%252F%252F%2520Add%2520an%2520event%2520listener%250A%252F*%250Abutton1.addListener%28%2522execute%2522%252C%2520handleExecute%252C%2520this%29%253B%250A*%252F%250A%22%7D
----- Original Message -----
From: Jean-Noël Rivasseau
Sent: 20/09/10 04:00 PM
To: qooxdoo Development
Subject: [qooxdoo-devel] Using a global error handler in Qx
Hello, We are at the point where we need to have extensive JS error logging in
production for our web-app. I've seen that Qx already tackles this problem with
a qx.event.GlobalError class. However I played with it this morning (we're
still under 1.0 but could update to 1.2.x if improvements have been made in
this area), and I was not really able to do anything useful with it. The two
points that bother me: 1) Is there an entry point for
qx.io.remote.transport.Script._requestFinished() ? It would seem normal to have
one, else every exception occuring on the return of a server request won't be
handled. But from my tests, it seems there isn't. Should I manually add it ?
(seems a bit strange) 2) Once I get the exception in the error handler, I was
not able to do anything with it. I just wrote a very stupid a =b line on the
source (where b is not defined). If I don't have an error handler defined,
under FF this pops up in the Firebug console with useful information and the
line of the error. If I activate the error handler, I get a qx.core.WindowError
object, but it does not contain any useful info: toString() returns "",
getLineNumber() returns 0 .... A global error handler is definitely something
that is needed in a complex web-app and we really need to use it... but at this
point I need help understanding how to make it work reasonably well. Jean-Noel
PS: I read the Qx docs on this.
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