@Override
    public void selectionChanged(IWorkbenchPart part, ISelection selection) {
        // wait half a second and then check if threadId is still current to trigger the actual process
        DelayedSelectionChanged delayedSelectionChanged = new DelayedSelectionChanged(
                this, threadId, part, selection);
        executorService.schedule(delayedSelectionChanged, 500,
                TimeUnit.MILLISECONDS);

    }

public class DelayedSelectionChanged implements Runnable {

    private final IDelayedSelectionListener propertiesView;

    private final AtomicLong currentId;

    private final long id;

    private final IWorkbenchPart part;

    private final ISelection selection;

    /**
     * Constructor.
     * 
     * @param propertiesView
     *            {@link PropertiesView}
     * @param currentId
     *            {@link AtomicLong}
     * @param part
     *            {@link IWorkbenchPart}
     * @param selection
     *            {@link ISelection}
     */
    public DelayedSelectionChanged(IDelayedSelectionListener propertiesView,
            AtomicLong currentId, IWorkbenchPart part, ISelection selection) {
        this.propertiesView = propertiesView;
        this.currentId = currentId;
        this.part = part;
        this.selection = selection;
        id = currentId.incrementAndGet();
    }

    @Override
    public void run() {
        if (this.id == currentId.get()) {
            propertiesView.delayedSelectionChanged(part, selection);
        }
    }
}