private void openEditor() {
	Job job = new Job("My Job's Name") {
		protected IStatus run(IProgressMonitor monitor) {
			try {
				// stuff happens
				openEditor(new Object[10000]);
				return Status.OK_STATUS;
			} finally {
				monitor.done();
			}
		}
	};
	job.schedule();
}

void openEditor(final Object[] lotsOfObjects) {
	UIJob job = new UIJob(/* Display */ null, "Opening editor...") {
		public IStatus runInUIThread(IProgressMonitor monitor) {
			try {
				IDE.openEditor(/* IWorkbenchPage */ null, /* new MyEditorInput(lotsOfObjects) */ (IEditorInput) null, "myEditorID");
			} catch (PartInitException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			return Status.OK_STATUS;
		}
	};
}