/**
* This method is called before the {@link PhaseId#INVOKE_APPLICATION} phase of the JSF lifecycle
* is executed. The purpose of this timing is to handle the case when the user clicks on a {@link
* UICommand} component (like h:commandButton or h:commandLink) that has been either
* Auto-ajaxified by ICEfaces, or manually Ajaxified by the developer using code like the
* following:
*
* <p><code><f:ajax execute="@form" render=" @form" /></code>
*
* <p>When this happens, we need to somehow remember the list of JavaScript and/or CSS resources
* that are currently in the <head> section of the portal page. This is because a
* navigation-rule might fire which could cause a new view to be rendered in the {@link
* PhaseId#RENDER_RESPONSE} phase that is about to follow this {@link PhaseId#INVOKE_APPLICATION}
* phase. The list of resources would be contained in the {@link HeadManagedBean} {@link
* ViewScoped} instance that is managed by the JSF managed-bean facility. The list would have been
* populated initially in the {@link HeadManagedBean} by the {@link HeadRender} during the initial
* HTTP-GET of the portal page. The way we "remember" the list is by placing it into the JSF 2
* {@link Flash} scope. This scope is used because it is very short-lived and survives any
* navigation-rules that might fire, thereby causing the rendering of a new JSF view.
*
* <p>The story is continued in the {@link #beforeRenderResponsePhase(PhaseEvent)} method below...
*/
protected void beforeInvokeApplicationPhase(PhaseEvent phaseEvent) {
// Get the list of resourceIds that might be contained in the Flash scope. Note that they would
// have been
// placed into the Flash scope by this very same method, except during in the case below for the
// RENDER_RESPONSE phase.
FacesContext facesContext = phaseEvent.getFacesContext();
Flash flash = facesContext.getExternalContext().getFlash();
@SuppressWarnings("unchecked")
Set<String> headResourceIdsFromFlash = (Set<String>) flash.get("HEAD_RESOURCE_IDS");
// Log the viewId so that it can be visually compared with the value that is to be logged after
// the
// INVOKE_APPLICATION phase completes.
logger.debug("Before INVOKE_APPLICATION: viewId=[{0}]", facesContext.getViewRoot().getViewId());
// If the Flash scope does not yet contain a list of head resourceIds, then the scope needs to
// be populated
// with a list so that the {@link #beforeRenderResponsePhase(PhaseEvent)} method below can
// retrieve it.
if (headResourceIdsFromFlash == null) {
HeadManagedBean headManagedBean = HeadManagedBean.getInstance(facesContext);
// Note that in the case where a portlet RESOURCE_PHASE was invoked with a "portlet:resource"
// type of URL,
// there will be no HeadManagedBean available.
if (headManagedBean != null) {
flash.put("HEAD_RESOURCE_IDS", headManagedBean.getHeadResourceIds());
}
}
}
/**
* This method is called before the {@link PhaseId#RENDER_RESPONSE} phase of the JSF lifecycle is
* executed. The purpose of this timing is to pick up where the {@link
* #beforeInvokeApplicationPhase(PhaseEvent)} method left off. It might be the case that a
* navigation-rule has fired and a NEW JSF view has been loaded up after the INVOKE_APPLICATION
* phase completed. If this is the case, then the list of head resourceIds in the {@link
* HeadManagedBean} needs to be repopulated from the list found in the Flash scope.
*/
protected void beforeRenderResponsePhase(PhaseEvent phaseEvent) {
FacesContext facesContext = phaseEvent.getFacesContext();
Flash flash = facesContext.getExternalContext().getFlash();
String viewId = facesContext.getViewRoot().getViewId();
@SuppressWarnings("unchecked")
Set<String> headResourceIdsFromFlash = (Set<String>) flash.get("HEAD_RESOURCE_IDS");
if (headResourceIdsFromFlash != null) {
HeadManagedBean headManagedBean = HeadManagedBean.getInstance(facesContext);
Set<String> managedBeanResourceIds = headManagedBean.getHeadResourceIds();
for (String resourceIdFromFlash : headResourceIdsFromFlash) {
if (!managedBeanResourceIds.contains(resourceIdFromFlash)) {
managedBeanResourceIds.add(resourceIdFromFlash);
logger.debug(
"Added resourceId=[{0}] from the Flash scope to the list of resourceIds in the HeadManagedBean for viewId=[{1}]",
resourceIdFromFlash, viewId);
}
}
}
}