Hi,
I am having a hard time with figuring out why my custom content listener
is no longer called after some time.
Basically, i want my extension to get triggered when a document with a
specific content type is loaded. So i implement a content listener as a
javascript component and i register it through
"@mozilla.org/uriloader;1". It works just fine, but one minute or 2
after the launch of Firefox, the component is not called anymore,
regardless of whether it has been called before.
I narrowed my code to this:
function DummyHandler() {
dump("[DummyHandler] constructor\n");
var uriLoader =
Components.classes["@mozilla.org/uriloader;1"].getService(Components.interfaces.nsIURILoader);
uriLoader.registerContentListener(this);
}
DummyHandler.prototype = {
get loadCookie() { dump("[DummyHandler] get loadCookie\n"); return
this.mLoadCookie; },
set loadCookie(newval) { dump("[DummyHandler] set loadCookie\n");
return this.mLoadCookie=newval; },
get parentContentListener() { dump("[DummyHandler] get
parentContentListener\n"); return this.mParentContentListener; },
set parentContentListener(newval) { dump("[DummyHandler] set
parentContentListener\n"); return this.mParentContentListener=newval; }
}
DummyHandler.prototype.canHandleContent = function(
contentType,
isContentPreferred,
desiredContentType ) {
dump("[DummyHandler] canHandleContent contentType: "+contentType+"\n");
return false;
}
DummyHandler.prototype.doContent = function(
contentType ,
isContentPreferred ,
request ,
contentHandler ) {
dump("[DummyHandler] doContent contentType: "+contentType+"\n");
return false;
}
DummyHandler.prototype.isPreferred = function(
contentType ,
desiredContentType ) {
dump("[DummyHandler] isPreferred contentType: "+contentType+"
"+desiredContentType+"\n");
return false;
}
DummyHandler.prototype.onStartURIOpen = function( URI ) {
dump("[DummyHandler] onStartURIOpen: "+URI.spec+"\n");
return false;
}
DummyHandler.prototype.GetWeakReference = function( ) {
dump("[DummyHandler] GetWeakReference\n");
return this;
}
DummyHandler.prototype.QueryInterface = function(iid) {
dump("[DummyHandler] QueryInterface("+iid+")\n");
if(
iid.equals(Components.interfaces.nsISupport) ||
iid.equals(Components.interfaces.nsIURIContentListener) ||
iid.equals(Components.interfaces.nsISupportsWeakReference)
) {
return this;
}
throw Components.results.NS_ERROR_NO_INTERFACE;
}
[... + usual javascript component registering stuff ...]
I instantiate my component from my overlay file.
After some time, the isPreferred stopped being called.
I also notice that onStartURIOpen, canHandleContent, GetWeakReference
and the accessor functions never get called, even at the beginning and
when isPreferred returns true. This is not a problem in my case as i
normally do all my stuff with isPreferred and doContent, but this might
be a clue.
Can the "@mozilla.org/uriloader;1" component forget about my listener ?
Any idea anyone ?
Thanks.
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