Examples with ListenerPriority com.vaadin.flow.router.ListenerPriority used on opensource projects

Example 1 with ListenerPriority

use of com.vaadin.flow.router.ListenerPriority in project flow by vaadin.

the class UIInternals method addListener.

private <E> Registration addListener(Class<E> handler, E listener) {
    session.checkHasLock();
    List<E> list = (List<E>) listeners.computeIfAbsent(handler, key -> new ArrayList<>());
    list.add(listener);
    list.sort((o1, o2) -> {
        Class<?> o1Class = o1.getClass();
        Class<?> o2Class = o2.getClass();
        final ListenerPriority listenerPriority1 = o1Class.getAnnotation(ListenerPriority.class);
        final ListenerPriority listenerPriority2 = o2Class.getAnnotation(ListenerPriority.class);
        final int priority1 = listenerPriority1 != null ? listenerPriority1.value() : 0;
        final int priority2 = listenerPriority2 != null ? listenerPriority2.value() : 0;
        // we want to have a descending order
        return Integer.compare(priority2, priority1);
    });
    return () -> list.remove(listener);
}