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SWT Browser; load from another Thread [message #452961]

Tue, 29 March 2005 09:17

No real name

Messages: 25
Registered: July 2009

Junior Member

Hello,

What I like to do;

Load a locally stored html page. Then check, if a remote server is
available. If it is available, load the remote stored html in the browser.

I use a Job to check if the remove server is available. But then, I receive
a Wrong Thread exception.

Is there a way to solve the problem?

Following the code:

private void loadRemoteWelcomePage() {
final String url =
DigiLohnPlugin.getDefault().getPluginPreferences()
.getDefaultString(StringConstants.BROWSER_URL_KEY.getValue() );

Job job = new Job("RemoteWelcomePage") {
protected IStatus run(final IProgressMonitor monitor) {
try {
final URL xx = new URL(url);
final String host = xx.getHost();
final Socket socket = new Socket(host, 80);
isConnected = socket.isConnected();
} catch (MalformedURLException exception) {
LOGGER.error("Wrong URL received", exception);
} catch (IOException exception) {
LOGGER.error("Can not connect to the host", exception);
}
System.out.println("Job finished");
return Status.OK_STATUS;
}
};

job.schedule(10000);
job.addJobChangeListener(new JobChangeAdapter() {
/**
* @see org.eclipse.core.runtime.jobs.JobChangeAdapter
* #done(org.eclipse.core.runtime.jobs.IJobChangeEvent)
*/
public void done(IJobChangeEvent event) {
System.out.println("Job done event received");
if (isConnected) {
System.out.println("isConnected=" + isConnected);
browser.setUrl(url);
}
}
});
}

Regards,

Cyrill

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Re: SWT Browser; load from another Thread [message #452982 is a reply to message #452961]

Tue, 29 March 2005 14:57

Christophe Cornu

Messages: 304
Registered: July 2009

Senior Member

The call
> browser.setUrl(url);
must be made from the UI thread (the one that created the SWT Display), like
any other SWT widget call.

http://dev.eclipse.org/viewcvs/index.cgi/%7Echeckout%7E/plat form-swt-home/faq.html#uithread

A quick patch to your code could look like:

Display.getDefault().syncExec(
new Runnable() {
public void run(){
browser.setUrl(url);
}
}
);

For Job API related questions, you could also ask on the
news://news.eclipse.org/eclipse.platform . You'll probably get an answer
from the owner of the Job API. I'm forwarding that thread to that developer
to get his opinion - above solution might be mixing 'low level' display
calls with 'high level' Job API in a manner not intended by the Job API.
Stay tuned...

Chris

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Re: SWT Browser; load from another Thread [message #452984 is a reply to message #452982]

Tue, 29 March 2005 15:34

Christophe Cornu

Messages: 304
Registered: July 2009

Senior Member

Here's the reply:

If you want synchronous UI updating than you can use display.syncExec. If
asyncronous is OK, you can use UIJob or WorkbenchJob.

To ask questions related to UIJob and WorkbenchJob, try the
news://news.eclipse.org/eclipse.platform newsgroup...

Chris

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