/*
* JBoss, Home of Professional Open Source.
* Copyright 2013, Red Hat, Inc., and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.gatein.cdi.contexts.beanstore;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
/**
* @author <a href="mailto:nscavell@redhat.com">Nick Scavelli</a>
*/
public class SessionBeanStore extends AbstractBeanStore {
private static final String PREFIX = SessionBeanStore.class.getName();
private static final String DELIM = "#";
private static final ThreadLocal<LockStore> CURRENT_LOCK_STORE = new ThreadLocal<LockStore>();
private transient volatile LockStore lockStore;
private final HttpServletRequest request;
private final HttpSession session;
public SessionBeanStore(HttpServletRequest request) {
this(request, null);
}
public SessionBeanStore(HttpSession session) {
this(null, session);
}
private SessionBeanStore(HttpServletRequest request, HttpSession session) {
this.request = request;
this.session = session;
}
@Override
@SuppressWarnings("unchecked")
public <T> BeanStoreInstance<T> getBean(String id) {
HttpSession session = getSession(false);
if (session == null) {
return null;
}
return (BeanStoreInstance<T>) session.getAttribute(prefix(id));
}
@Override
public <T> void put(String id, BeanStoreInstance<T> instance) {
HttpSession session = getSession(true);
if (session != null) {
session.setAttribute(prefix(id), instance);
}
}
@Override
public LockedBean lock(String id) {
return getLockStore().lock(id);
}
@Override
public void destroy(String windowId) {
for (String id : this) {
if (id.startsWith(windowId)) {
destroyBean(getBean(id));
removeAttribute(id);
}
}
}
@Override
public void destroy() {
for (String id : this) {
destroyBean(getBean(id));
removeAttribute(id);
}
}
@Override
public Iterator<String> iterator() {
return getIds(getSession(false)).iterator();
}
// Implementation taken from Weld's AbstractSessionBeanStore
public LockStore getLockStore() {
LockStore lockStore = this.lockStore;
if (lockStore == null) {
//needed to prevent some edge cases
//where we would otherwise enter an infinite loop
lockStore = CURRENT_LOCK_STORE.get();
if (lockStore != null) {
return lockStore;
}
HttpSession session = getSession(false);
if (session == null) {
lockStore = new LockStore();
CURRENT_LOCK_STORE.set(lockStore);
try {
session = getSession(true);
} finally {
CURRENT_LOCK_STORE.remove();
}
}
lockStore = (LockStore) session.getAttribute(LockStore.SESSION_KEY);
if (lockStore == null) {
//we don't really have anything we can lock on
//so we just acquire a big global lock
//this should only be taken on session creation though
//so should not be a problem
synchronized (SessionBeanStore.class) {
lockStore = (LockStore) session.getAttribute(LockStore.SESSION_KEY);
if (lockStore == null) {
lockStore = new LockStore();
session.setAttribute(LockStore.SESSION_KEY, lockStore);
}
}
}
this.lockStore = lockStore;
}
return lockStore;
}
public HttpSession getSession(boolean create) {
return (session != null) ? session : request.getSession(create);
}
private void removeAttribute(String id) {
HttpSession session = getSession(false);
if (session != null) {
session.removeAttribute(prefix(id));
}
}
private static List<String> getIds(HttpSession session) {
if (session == null) return Collections.emptyList();
List<String> list = new ArrayList<String>();
Enumeration<String> enumeration = session.getAttributeNames();
while (enumeration.hasMoreElements()) {
String attributeName = enumeration.nextElement();
if (attributeName.startsWith(PREFIX)) {
list.add(deprefix(attributeName));
}
}
return list;
}
private static String prefix(String id) {
return PREFIX + DELIM + id;
}
private static String deprefix(String attributeName) {
return attributeName.substring(PREFIX.length() + DELIM.length());
}
}