public class ViewScopeCallbackRegistrer implements ViewMapListener { @SuppressWarnings("unchecked") @Override public void processEvent(SystemEvent event) throws AbortProcessingException { if (event instanceof PostConstructViewMapEvent) { PostConstructViewMapEvent viewMapEvent = (PostConstructViewMapEvent) event; UIViewRoot viewRoot = (UIViewRoot) viewMapEvent.getComponent(); viewRoot.getViewMap().put( ViewScope.VIEW_SCOPE_CALLBACKS, new HashMap<String, Runnable>() ); } else if (event instanceof PreDestroyViewMapEvent) { PreDestroyViewMapEvent viewMapEvent = (PreDestroyViewMapEvent) event; UIViewRoot viewRoot = (UIViewRoot) viewMapEvent.getComponent(); Map<String, Runnable> callbacks = (Map<String, Runnable>) viewRoot .getViewMap().get(ViewScope.VIEW_SCOPE_CALLBACKS); if (callbacks != null) { for (Runnable c : callbacks.values()) { c.run(); } callbacks.clear(); } } } @Override public boolean isListenerForSource(Object source) { return source instanceof UIViewRoot; }}
