Grant Mc Auley wrote:
No. It looks like the event does not even get fired. This is the state of the GVTTreeBuilder thread when the main thread is waiting (ie, mutex.wait() ):
org.apache.batik.util.EventDispatcher
org.apache.batik.swing.gvt.GVTTreeRenderer.fireEvent() org.apache.batik.swing.gvt.GVTTreeRenderer.run()
When I do not use the mutex and use a breakpoint in renderingCompleted() I see this when stopped at the breakpoint:
java.awt.EventQueue.postEventPrivate()
java.awt.EventQueue.postEvent()
java.awt.EventQueue.invokeAndWait()
org.apache.batik.util.EventDispatcher
org.apache.batik.swing.gvt.GVTTreeRenderer.fireEvent() org.apache.batik.swing.gvt.GVTTreeRenderer.run()
So, somehow the waiting main thread seems to prevent the posting of the
event from the TreeBuilder thread.
The GVTTreeBuilder is a seperate thread but I believe it notifies in the AWT event thread.
A deadlock would occur if the AWT Event thread was wait()ing for the
wait()ing main thread. I wonder if this occurs for applets. In other
words, is the AWT Event thread suspended until init() returns?
Yah, I suspect that the init thread either is the Event thread or the Event thread will not be created until init returns. Either way it is effectively impossible to delay the init thread until the GVTTreeRenderer completes.
-----Original Message-----
From: Thomas DeWeese [mailto:[EMAIL PROTECTED] Sent: Tuesday, September 09, 2003 4:50 PM
To: Batik Users
Subject: Re: Waiting for RenderingCompleted
Grant Mc Auley wrote:
I need to ensure that the UpdateManager and all SVG element
are not null
and available before an Applet's init() method returns in the code below. In other words, I need to delay init() from returning until gvtRendingCompleted() is called.
Does anybody have any suggestions on how I might
accomplish this? I
have tried many approaches but to no avail. I am unclear about the
relationship between the GVTTreeBuilder thread and the main
thread. Any
help with this would be much appreciated as I am facing a deadline.
You need to setup a mutex and wait on it, you probably also want to check for failed/interrupted conditions:
Object mutext = new Object; canvas.addGVTTreeRendererListener(new GVTTreeRendererAdapter() { public void gvtRenderingCompleted(GVTTreeRendererEvent e) { // . . .
synchronized (mutext) { mutex.notifyAll(); } }
synchronized (mutext) { canvas.setDocument(doc); try { mutext.wait(); catch(InterruptedException ie) { ie.printStackTrace(); } }
//----------------------------------------------------------------
init() {
File f = new File("file.svg"); canvas = new JSVGCanvas(); canvas.addGVTTreeRendererListener(new GVTTreeRendererAdapter() {
public void gvtRenderingCompleted(GVTTreeRendererEvent e) {
um = canvas.getUpdateManager(); element = doc.getElementByID("name"); . . .
}
});
canvas.setDocumentState(JSVGCanvas.ALWAYS_DYNAMIC);
String parser = XMLResourceDescriptor.getXMLParserClassName();
SAXSVGDocumentFactory factory = new
SAXSVGDocumentFactory(parser);
doc = factory.createDocument(f.toURL().toString()); canvas.setDocument(doc);
// delay goes here
}
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