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EE4J Compatible Implementation for Jakarta Faces API
/*
* Copyright (c) 1997, 2020 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package com.sun.faces.application.view;
import static com.sun.faces.config.WebConfiguration.BooleanWebContextInitParameter.EnableDistributable;
import static com.sun.faces.config.WebConfiguration.WebContextInitParameter.NumberOfActiveViewMaps;
import static java.util.logging.Level.FINEST;
import static java.util.logging.Level.WARNING;
import java.util.Collections;
import java.util.Iterator;
import java.util.Map;
import java.util.UUID;
import java.util.logging.Logger;
import com.sun.faces.application.ApplicationAssociate;
import com.sun.faces.config.WebConfiguration;
import com.sun.faces.util.LRUMap;
import jakarta.faces.application.FacesMessage;
import jakarta.faces.application.ProjectStage;
import jakarta.faces.component.UIViewRoot;
import jakarta.faces.context.FacesContext;
import jakarta.faces.event.AbortProcessingException;
import jakarta.faces.event.PostConstructViewMapEvent;
import jakarta.faces.event.PreDestroyViewMapEvent;
import jakarta.faces.event.SystemEvent;
import jakarta.faces.event.ViewMapListener;
import jakarta.servlet.http.HttpSession;
import jakarta.servlet.http.HttpSessionEvent;
import jakarta.servlet.http.HttpSessionListener;
/**
* The manager that deals with non-CDI and CDI ViewScoped beans.
*/
public class ViewScopeManager implements HttpSessionListener, ViewMapListener {
/**
* Stores the logger.
*/
private static final Logger LOGGER = Logger.getLogger(ViewScopeManager.class.getName());
/**
* Stores the constants to keep track of the active view maps.
*/
public static final String ACTIVE_VIEW_MAPS = "com.sun.faces.application.view.activeViewMaps";
/**
* Stores the constant for the maximum active view map size.
*/
public static final String ACTIVE_VIEW_MAPS_SIZE = "com.sun.faces.application.view.activeViewMapsSize";
/**
* Stores the view map.
*/
public static final String VIEW_MAP = "com.sun.faces.application.view.viewMap";
/**
* Stores the view map id.
*/
public static final String VIEW_MAP_ID = "com.sun.faces.application.view.viewMapId";
/**
* Stores the constant to keep track of the ViewScopeManager.
*/
public static final String VIEW_SCOPE_MANAGER = "com.sun.faces.application.view.viewScopeManager";
/**
* Stores the CDI context manager.
*/
private ViewScopeContextManager contextManager;
private boolean distributable;
private Integer numberOfActiveViewMapsInWebXml;
/**
* Constructor.
*/
public ViewScopeManager() {
FacesContext context = FacesContext.getCurrentInstance();
contextManager = new ViewScopeContextManager();
WebConfiguration config = WebConfiguration.getInstance(context.getExternalContext());
distributable = config.isOptionEnabled(EnableDistributable);
String numberOfActiveViewMapsAsString = config.getOptionValue(NumberOfActiveViewMaps);
if (numberOfActiveViewMapsAsString != null) {
try {
numberOfActiveViewMapsInWebXml = Integer.parseInt(numberOfActiveViewMapsAsString);
}
catch (NumberFormatException e) {
if (LOGGER.isLoggable(WARNING)) {
LOGGER.log(WARNING, "Cannot parse " + NumberOfActiveViewMaps.getQualifiedName(), e);
}
}
}
}
/**
* Static method that locates the ID for a view map in the active view maps
* stored in the session. It just performs a == over the view map because
* it should be the same object.
*
* @param facesContext The faces context
* @param viewMap The view to locate
* @return located ID
*/
protected static String locateViewMapId(FacesContext facesContext, Map viewMap) {
Object session = facesContext.getExternalContext().getSession(true);
if (session != null) {
Map sessionMap = facesContext.getExternalContext().getSessionMap();
@SuppressWarnings("unchecked")
Map viewMaps = (Map) sessionMap.get(ACTIVE_VIEW_MAPS);
if (viewMaps != null) {
for (Map.Entry entry : viewMaps.entrySet()) {
if (viewMap == entry.getValue()) {
return entry.getKey();
}
}
}
}
return null;
}
/**
* Clear the current view map using the Faces context.
*
* @param facesContext the Faces context.
*/
public void clear(FacesContext facesContext) {
LOGGER.log(FINEST, "Clearing @ViewScoped beans from current view map");
if (contextManager != null) {
contextManager.clear(facesContext);
}
}
/**
* Clear the given view map. Use the version with viewMapId.
*
* @param facesContext the Faces context.
* @param viewMap the view map.
*/
@Deprecated
public void clear(FacesContext facesContext, Map viewMap) {
String viewMapId = locateViewMapId(facesContext, viewMap);
if (viewMapId != null) {
this.clear(facesContext, viewMapId, viewMap);
} else {
LOGGER.log(WARNING, "Cannot locate the view map to clear in the active maps: {0}", viewMap);
}
}
/**
* Clear the given view map.
*
* @param facesContext the Faces context.
* @param viewMapId The ID of the view map
* @param viewMap the view map.
*/
public void clear(FacesContext facesContext, String viewMapId, Map viewMap) {
LOGGER.log(FINEST, "Clearing @ViewScoped beans from view map: {0}", viewMap);
if (contextManager != null) {
contextManager.clear(facesContext, viewMapId, viewMap);
}
destroyBeans(facesContext, viewMap);
}
/**
* Destroy the managed beans from the given view map.
*
* @param facesContext the Faces Context.
* @param viewMap the view map.
*/
public void destroyBeans(FacesContext facesContext, Map viewMap) {
LOGGER.log(FINEST, "Destroying @ViewScoped beans from view map: {0}", viewMap);
ApplicationAssociate applicationAssociate = ApplicationAssociate.getInstance(facesContext.getExternalContext());
if (applicationAssociate != null) {
destroyBeans(applicationAssociate, viewMap);
}
}
/**
* Destroy the managed beans from the given view map.
*
* @param applicationAssociate the application associate.
* @param viewMap the view map.
*/
private void destroyBeans(ApplicationAssociate applicationAssociate, Map viewMap) {
}
/**
* Get the CDI context manager.
*
* @return the CDI context manager.
*/
ViewScopeContextManager getContextManager() {
return contextManager;
}
/**
* Get our instance.
*
* @param facesContext the FacesContext.
* @return our instance.
*/
public static ViewScopeManager getInstance(FacesContext facesContext) {
if (!facesContext.getExternalContext().getApplicationMap().containsKey(VIEW_SCOPE_MANAGER)) {
facesContext.getExternalContext().getApplicationMap().put(VIEW_SCOPE_MANAGER, new ViewScopeManager());
}
return (ViewScopeManager) facesContext.getExternalContext().getApplicationMap().get(VIEW_SCOPE_MANAGER);
}
/**
* Is a listener for the given source.
*
* @param source the source.
* @return true if UIViewRoot, false otherwise.
*/
@Override
public boolean isListenerForSource(Object source) {
return source instanceof UIViewRoot;
}
/**
* Process the system event.
*
* @param systemEvent the system event.
* @throws AbortProcessingException when processing needs to be aborted.
*/
@Override
public void processEvent(SystemEvent systemEvent) throws AbortProcessingException {
if (systemEvent instanceof PreDestroyViewMapEvent) {
processPreDestroyViewMap(systemEvent);
}
if (systemEvent instanceof PostConstructViewMapEvent) {
processPostConstructViewMap(systemEvent);
}
}
/**
* Process the PostConstructViewMap system event.
*
* @param systemEvent the system event.
*/
private void processPostConstructViewMap(SystemEvent systemEvent) {
LOGGER.log(FINEST, "Handling PostConstructViewMapEvent");
UIViewRoot viewRoot = (UIViewRoot) systemEvent.getSource();
Map viewMap = viewRoot.getViewMap(false);
if (viewMap != null) {
FacesContext facesContext = FacesContext.getCurrentInstance();
if (viewRoot.isTransient() && facesContext.isProjectStage(ProjectStage.Development)) {
FacesMessage message = new FacesMessage(FacesMessage.SEVERITY_WARN, "@ViewScoped beans are not supported on stateless views",
"@ViewScoped beans are not supported on stateless views");
facesContext.addMessage(viewRoot.getClientId(facesContext), message);
LOGGER.log(WARNING, "@ViewScoped beans are not supported on stateless views");
}
Object session = facesContext.getExternalContext().getSession(true);
if (session != null) {
Map sessionMap = facesContext.getExternalContext().getSessionMap();
Integer size = (Integer) sessionMap.get(ACTIVE_VIEW_MAPS_SIZE);
if (size == null) {
size = numberOfActiveViewMapsInWebXml;
if (size == null) {
size = Integer.parseInt(NumberOfActiveViewMaps.getDefaultValue());
}
}
if (sessionMap.get(ACTIVE_VIEW_MAPS) == null) {
sessionMap.put(ACTIVE_VIEW_MAPS, Collections.synchronizedMap(new LRUMap(size)));
}
@SuppressWarnings("unchecked")
Map viewMaps = (Map) sessionMap.get(ACTIVE_VIEW_MAPS);
synchronized (viewMaps) {
String viewMapId = UUID.randomUUID().toString();
while (viewMaps.containsKey(viewMapId)) {
viewMapId = UUID.randomUUID().toString();
}
if (viewMaps.size() == size) {
String eldestViewMapId = viewMaps.keySet().iterator().next();
@SuppressWarnings("unchecked")
Map eldestViewMap = (Map) viewMaps.remove(eldestViewMapId);
removeEldestViewMap(facesContext, eldestViewMapId, eldestViewMap);
}
viewMaps.put(viewMapId, viewMap);
viewRoot.getTransientStateHelper().putTransient(VIEW_MAP_ID, viewMapId);
viewRoot.getTransientStateHelper().putTransient(VIEW_MAP, viewMap);
if (distributable) {
// If we are distributable, this will result in a dirtying of the
// session data, forcing replication. If we are not distributable,
// this is a no-op.
sessionMap.put(ACTIVE_VIEW_MAPS, viewMaps);
}
}
if (contextManager != null) {
contextManager.fireInitializedEvent(facesContext, viewRoot);
}
}
}
}
/**
* Process the PreDestroyViewMap system event.
*
* @param se the system event.
*/
private void processPreDestroyViewMap(SystemEvent se) {
LOGGER.log(FINEST, "Handling PreDestroyViewMapEvent");
UIViewRoot viewRoot = (UIViewRoot) se.getSource();
Map viewMap = viewRoot.getViewMap(false);
String viewMapId = (String) viewRoot.getTransientStateHelper().getTransient(VIEW_MAP_ID);
if (viewMap != null && viewMapId != null && !viewMap.isEmpty()) {
FacesContext facesContext = FacesContext.getCurrentInstance();
if (contextManager != null) {
contextManager.clear(facesContext, viewMapId, viewMap);
contextManager.fireDestroyedEvent(facesContext, viewRoot);
}
destroyBeans(facesContext, viewMap);
}
}
/**
* Create the associated data in the session (if any).
*
* @param se the HTTP session event.
*/
@Override
public void sessionCreated(HttpSessionEvent se) {
LOGGER.log(FINEST, "Creating session for @ViewScoped beans");
}
/**
* Destroy the associated data in the session.
*
* @param httpSessionEvent the HTTP session event.
*/
@Override
public void sessionDestroyed(HttpSessionEvent httpSessionEvent) {
LOGGER.log(FINEST, "Cleaning up session for @ViewScoped beans");
if (contextManager != null) {
contextManager.sessionDestroyed(httpSessionEvent);
}
HttpSession session = httpSessionEvent.getSession();
@SuppressWarnings("unchecked")
Map activeViewMaps = (Map) session.getAttribute(ACTIVE_VIEW_MAPS);
if (activeViewMaps != null) {
Iterator