br.gov.frameworkdemoiselle.internal.context.FacesViewContextImpl Maven / Gradle / Ivy
/*
* Demoiselle Framework
* Copyright (C) 2010 SERPRO
* ----------------------------------------------------------------------------
* This file is part of Demoiselle Framework.
*
* Demoiselle Framework is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License version 3
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License version 3
* along with this program; if not, see viewStoreInSession = new ConcurrentHashMap();
private static final String FACES_KEY = FacesViewContextImpl.class.getCanonicalName();
public FacesViewContextImpl() {
super(ViewScoped.class);
}
@Override
protected boolean isStoreInitialized() {
return FacesContext.getCurrentInstance() != null && getSessionId() != null;
}
@Override
protected BeanStore getStore() {
String sessionId = getSessionId();
if (sessionId == null) {
return null;
}
/*
* Tenta obter o viewID de forma não thread-safe por questões de performance. Se o viewID não existe entra em um
* trecho thread-safe para incrementa-lo, evitando conflito entre duas requests tentando incrementar esse
* número.
*/
Long viewId = (Long) Faces.getViewMap().get(FACES_KEY);
if (viewId == null) {
synchronized (this) {
// Tenta obte-lo novamente, caso entre a primeira tentativa e o
// bloqueio
// da thread outra thread já tenha criado o número.
viewId = (Long) Faces.getViewMap().get(FACES_KEY);
if (viewId == null) {
viewId = atomicLong.incrementAndGet();
Faces.getViewMap().put(FACES_KEY, viewId);
}
}
}
// A mesma técnica de bloqueio de thread acima é usada aqui para
// criar um FacesViewBeanStore caso o mesmo ainda não exista, e
// associa-lo à sessão atual.
FacesViewBeanStore currentViewStore = viewStoreInSession.get(sessionId);
if (currentViewStore == null) {
synchronized (this) {
currentViewStore = (FacesViewBeanStore) viewStoreInSession.get(sessionId);
if (currentViewStore == null) {
currentViewStore = new FacesViewBeanStore(getSessionTimeout());
viewStoreInSession.put(sessionId, currentViewStore);
}
}
}
return currentViewStore.getStoreForView(viewId, this);
}
/*
* Called before the session is invalidated for that user.
* Destroys all view scoped beans stored on that session.
*/
private void clearInvalidatedSession(String sessionId) {
if (sessionId != null) {
final FacesViewBeanStore store = viewStoreInSession.get(sessionId);
if (store != null) {
store.destroyStoresInSession(this);
viewStoreInSession.remove(sessionId);
}
}
}
/*
* Called at each new request at a given session.
* Destroys any expired views.
*/
private synchronized void clearExpiredViews(String sessionId) {
if (sessionId != null) {
final FacesViewBeanStore store = viewStoreInSession.get(sessionId);
if (store != null) {
store.destroyStoresInSession(this, true);
}
}
}
/*
* Returns the current session ID. Creates a session if one doesn't exist.
* Returns NULL if the session can't be created.
*/
private String getSessionId() {
final HttpSession session = (HttpSession) FacesContext.getCurrentInstance().getExternalContext()
.getSession(true);
return session != null ? session.getId() : null;
}
/*
* Returns the configured session timeout in seconds. This is the maximum
* inactive interval, not the remaining timeout for this session.
*/
private int getSessionTimeout() {
final HttpSession session = (HttpSession) FacesContext.getCurrentInstance().getExternalContext()
.getSession(true);
return session != null ? session.getMaxInactiveInterval() : 0;
}
/**
* Observes HTTP servlet lifecycle and notifies the ViewContext of session events (creation or destruction)
* and request events (before going into scope and before going out of scope) so view
* scoped beans can be created or destroyed based on their underlying session and request scopes.
*
* @author SERPRO
*/
@ApplicationScoped
protected static class ServletEventListener {
/**
* Called before the session is invalidated for that user. Destroys all view scoped beans stored on that
* session.
*/
protected void clearInvalidatedSession(@Observes BeforeSessionDestroyed event) {
String sessionId = event.getSessionId();
try {
Context context = Beans.getBeanManager().getContext(ViewScoped.class);
if (FacesViewContextImpl.class.isInstance(context)) {
((FacesViewContextImpl) context).clearInvalidatedSession(sessionId);
}
} catch (ContextNotActiveException ce) {
// Nada a fazer, contexto não está ativo.
}
}
/**
* Called before the current request is about to go out of scope. Checks if any currently
* active views have expired and requests the destruction of those beans according to CDI
* lifecycle.
*
*/
protected void clearExpiredViews(@Observes BeforeRequestDestroyed event) {
ServletRequest request = event.getRequest();
if (HttpServletRequest.class.isInstance(request)) {
HttpSession session = ((HttpServletRequest) request).getSession(false);
if (session != null) {
try {
final Context context = Beans.getBeanManager().getContext(ViewScoped.class);
final String currentSessionId = session.getId();
if (FacesViewContextImpl.class.isInstance(context)) {
new Thread() {
@Override
public void run() {
((FacesViewContextImpl) context).clearExpiredViews(currentSessionId);
}
}.start();
}
} catch (ContextNotActiveException ce) {
// Nada a fazer, contexto não está ativo.
}
}
}
}
}
}
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