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vineri, 4 martie 2016

[OmniFaces utilities (2.3)] Remove server side JSF view state associated with current request


[OmniFaces utilities] The removeViewState() method remove server side JSF view state associated with current request.

Method

Moreover, see also the private helpers:


Usage:

In order to remove the current view we need to pass to Hacks#removeViewState()  the current FacesContext, ResponseStateManager and view ID. For example:

<h:commandButton value="Click me to remove view state!"  
                 action="#{viewBean.removeViewStateAction()}"/>

import org.omnifaces.util.Faces;
import org.omnifaces.util.FacesLocal;
import org.omnifaces.util.Hacks;
...
public void removeViewStateAction() {
 FacesContext facesContext = Faces.getContext();
 RenderKit renderKit = FacesLocal.getRenderKit(facesContext);
 ResponseStateManager responseStateManager = renderKit.getResponseStateManager();
 String viewId = Faces.getViewId();

 Hacks.removeViewState(facesContext, responseStateManager, viewId);         
}
   
OmniFaces uses this method internally in RestorableViewHandler for removing the current view and returning the restored(new created) one:

@Override
public UIViewRoot restoreView(FacesContext context, String viewId) {
 if (isUnloadRequest(context)) {
     UIViewRoot createdView = createView(context, viewId);
     ResponseStateManager manager = getRenderKit(context).getResponseStateManager();

     if (restoreViewRootState(context, manager, createdView)) {
         context.setProcessingEvents(true);
         context.getApplication().publishEvent(context, PreDestroyViewMapEvent.class, UIViewRoot.class, createdView);
        Hacks.removeViewState(context, manager, viewId);
     }

     responseComplete();
     return createdView;
 }

 UIViewRoot restoredView = super.restoreView(context, viewId);

 if (!(isRestorableViewEnabled(context) && restoredView == null && context.isPostback())) {
     return restoredView;
 }

 try {
     UIViewRoot createdView = buildView(viewId);
     return isRestorableView(createdView) ? createdView : null;
 } catch (IOException e) {
     throw new FacesException(e);
 }
}

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