javax.faces.CurrentThreadToServletContext Maven / Gradle / Ivy
The newest version!
/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 1997-2012 Oracle and/or its affiliates. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* https://glassfish.java.net/public/CDDL+GPL_1_1.html
* or packager/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at packager/legal/LICENSE.txt.
*
* GPL Classpath Exception:
* Oracle designates this particular file as subject to the "Classpath"
* exception as provided by Oracle in the GPL Version 2 section of the License
* file that accompanied this code.
*
* Modifications:
* If applicable, add the following below the License Header, with the fields
* enclosed by brackets [] replaced by your own identifying information:
* "Portions Copyright [year] [name of copyright owner]"
*
* Contributor(s):
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*/
package javax.faces;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.faces.context.ExternalContext;
import javax.faces.context.FacesContext;
// ----------------------------------------------------------- Inner Classes
final class CurrentThreadToServletContext {
ConcurrentMap applicationMap = new ConcurrentHashMap<>();
private AtomicBoolean logNullFacesContext = new AtomicBoolean(false);
private AtomicBoolean logNonNullFacesContext = new AtomicBoolean(false);
// Bug 20458755: This instance provides a method to look up the current FacesContext
// that bypasses the additional check for the InitFacesContext introduced
// by the fix for 20458755
private final ServletContextFacesContextFactory servletContextFacesContextFactory;
private static final Logger LOGGER;
static {
LOGGER = Logger.getLogger("javax.faces", "javax.faces.LogStrings");
}
CurrentThreadToServletContext() {
servletContextFacesContextFactory = new ServletContextFacesContextFactory();
}
// ------------------------------------------------------ Public Methods
Object getFallbackFactory(FactoryFinderInstance brokenFactoryManager, String factoryName) {
Object result = null;
ClassLoader cl = getClassLoader();
for (Map.Entry cur : applicationMap.entrySet()) {
if (cur.getKey().getClassLoader().equals(cl) && !cur.getValue().equals(brokenFactoryManager)) {
result = cur.getValue().getFactory(factoryName);
if (null != result) {
break;
}
}
}
return result;
}
FactoryFinderInstance getApplicationFactoryManager() {
ClassLoader cl = getClassLoader();
FactoryFinderInstance result = getApplicationFactoryManager(cl, true);
return result;
}
FactoryFinderInstance getApplicationFactoryManager(boolean create) {
ClassLoader cl = getClassLoader();
FactoryFinderInstance result = getApplicationFactoryManager(cl, create);
return result;
}
private FactoryFinderInstance getApplicationFactoryManager(ClassLoader cl, boolean create) {
FacesContext facesContext = servletContextFacesContextFactory.getFacesContextWithoutServletContextLookup();
boolean isSpecialInitializationCase = detectSpecialInitializationCase(facesContext);
FactoryManagerCacheKey key = new FactoryManagerCacheKey(facesContext, cl, applicationMap);
FactoryFinderInstance result = applicationMap.get(key);
FactoryFinderInstance toCopy = null;
if (result == null && create) {
boolean createNewFactoryManagerInstance = false;
if (isSpecialInitializationCase) {
// We need to obtain a reference to the correct
// FactoryFinderInstance. Iterate through the data structure
// containing all FactoryFinderInstance instances for this VM.
FactoryManagerCacheKey curKey;
boolean classLoadersMatchButContextsDoNotMatch = false;
boolean foundNoMatchInApplicationMap = true;
for (Map.Entry cur : applicationMap.entrySet()) {
curKey = cur.getKey();
// If the current FactoryFinderInstance is for a
// the same ClassLoader as the current ClassLoader...
if (curKey.getClassLoader().equals(cl)) {
foundNoMatchInApplicationMap = false;
// Check the other descriminator for the
// key: the context.
// If the context objects of the keys are
// both non-null and non-equal, then *do*
// create a new FactoryFinderInstance instance.
if ((null != key.getContext() && null != curKey.getContext()) && (!key.getContext().equals(curKey.getContext()))) {
classLoadersMatchButContextsDoNotMatch = true;
toCopy = cur.getValue();
} else {
// Otherwise, use this FactoryFinderInstance
// instance.
result = cur.getValue();
}
break;
}
}
// We must create a new FactoryFinderInstance if there was no matchingKey
// at all found in the applicationMap, or a matchingKey was found
// and the matchingKey is safe to use in this web app
createNewFactoryManagerInstance = foundNoMatchInApplicationMap || (null == result && classLoadersMatchButContextsDoNotMatch);
} else {
createNewFactoryManagerInstance = true;
}
if (createNewFactoryManagerInstance) {
FactoryFinderInstance newResult;
if (null != toCopy) {
newResult = new FactoryFinderInstance(toCopy);
} else {
newResult = new FactoryFinderInstance();
}
result = applicationMap.putIfAbsent(key, newResult);
result = (null != result) ? result : newResult;
}
}
return result;
}
/*
* Uses the FactoryManagerCacheKey system to find the ServletContext
* associated with the current ClassLoader, if any.
*/
Object getServletContextForCurrentClassLoader() {
Object result;
FactoryManagerCacheKey key = new FactoryManagerCacheKey(null, getClassLoader(), applicationMap);
result = key.getContext();
return result;
}
/**
* This method is used to detect the following special initialization case.
* IF no FactoryFinderInstance can be found for key,
AND this call to getApplicationFactoryFinderInstance() *does* have a currentKeyrent FacesContext
BUT a previous call to getApplicationFactoryFinderInstance *did not* have a currentKeyrent FacesContext
*
* @param facesContext the currentKeyrent FacesContext for this request
* @return true if the currentKeyrent execution falls into the special initialization case.
*/
private boolean detectSpecialInitializationCase(FacesContext facesContext) {
boolean result = false;
if (null == facesContext) {
logNullFacesContext.compareAndSet(false, true);
} else {
logNonNullFacesContext.compareAndSet(false, true);
}
result = logNullFacesContext.get() && logNonNullFacesContext.get();
return result;
}
void removeApplicationFactoryManager() {
ClassLoader cl = getClassLoader();
FactoryFinderInstance fm = this.getApplicationFactoryManager(cl, false);
if (null != fm) {
fm.clearInjectionProvider();
}
FacesContext facesContext = servletContextFacesContextFactory.getFacesContextWithoutServletContextLookup();
boolean isSpecialInitializationCase = detectSpecialInitializationCase(facesContext);
FactoryManagerCacheKey key = new FactoryManagerCacheKey(facesContext, cl, applicationMap);
applicationMap.remove(key);
if (isSpecialInitializationCase) {
logNullFacesContext.set(false);
logNonNullFacesContext.set(false);
}
}
void resetSpecialInitializationCaseFlags() {
logNullFacesContext.set(false);
logNonNullFacesContext.set(false);
}
/**
* Identify and return the class loader that is associated with the
* calling web application.
*
* @throws FacesException if the web application class loader
* cannot be identified
*/
private ClassLoader getClassLoader() throws FacesException {
// J2EE 1.3 (and later) containers are required to make the
// web application class loader visible through the context
// class loader of the current thread.
ClassLoader cl = Thread.currentThread().getContextClassLoader();
if (cl == null) {
throw new FacesException("getContextClassLoader");
}
return (cl);
}
private static final class FactoryManagerCacheKey {
// The ClassLoader that is active the first time this key
// is created. At startup time, this is assumed to be the
// web app ClassLoader
private ClassLoader cl;
// I marker that disambiguates the case when multiple
// web apps have the same web app ClassLoader but different
// ServletContext instances.
private Long marker;
// The ServletContext corresponding to this marker/ClassLoader pair.
private Object context;
private static final String MARKER_KEY = FactoryFinder.class.getName() + "." +
FactoryManagerCacheKey.class.getSimpleName();
private static final String INIT_TIME_CL_KEY = MARKER_KEY + ".InitTimeCLKey";
//
FactoryManagerCacheKey(FacesContext facesContext, ClassLoader cl,
Map factoryMap) {
ExternalContext extContext = (null != facesContext) ? facesContext.getExternalContext()
: null;
Object servletContext = (null != extContext) ? extContext.getContext() : null;
if (null == facesContext || null == extContext || null == servletContext) {
initFromFactoryMap(cl, factoryMap);
} else {
initFromAppMap(extContext, cl);
}
}
private void initFromFactoryMap(ClassLoader cl,
Map factoryMap) {
// We don't have a FacesContext.
// Our only recourse is to inspect the keys of the
// factoryMap and see if any of them has a classloader
// equal to our argument cl.
Set keys = factoryMap.keySet();
FactoryManagerCacheKey matchingKey = null;
if (keys.isEmpty()) {
this.cl = cl;
this.marker = new Long(System.currentTimeMillis());
} else {
// For each entry in the factoryMap's keySet...
for (FactoryManagerCacheKey currentKey : keys) {
assert(null != currentKey.cl);
ClassLoader matchingCL = findMatchConsideringParentClassLoader(cl, currentKey.cl);
// If there is a match...
if (null != matchingCL) {
// If the match was found on a previous iteration...
if (null != matchingKey) {
LOGGER.log(Level.WARNING, "Multiple JSF Applications found on same ClassLoader. Unable to safely determine which FactoryManager instance to use. Defaulting to first match.");
break;
}
matchingKey = currentKey;
this.cl = matchingCL;
}
}
if (null != matchingKey) {
this.marker = matchingKey.marker;
this.context = matchingKey.context;
}
}
}
private ClassLoader findMatchConsideringParentClassLoader(ClassLoader argumentCL, ClassLoader currentKeyCL) {
ClassLoader curCL = argumentCL;
// For each ClassLoader in the hierarchy starting
// with the argument ClassLoader...
while (null != curCL) {
// if the ClassLoader at this level in the hierarchy
// is equal to the argument ClassLoader, consider it a matchingKey.
if (curCL.equals(currentKeyCL)) {
return curCL;
} else {
// If it's not a matchingKey, try the parent in the ClassLoader
// hierarchy.
curCL = curCL.getParent();
}
}
return null;
}
private void initFromAppMap(ExternalContext extContext, ClassLoader cl) {
Map appMap = extContext.getApplicationMap();
Long val = (Long) appMap.get(MARKER_KEY);
if (null == val) {
this.marker = new Long(System.currentTimeMillis());
appMap.put(MARKER_KEY, marker);
// If we needed to create a marker, assume that the
// argument CL is safe to treat as the web app
// ClassLoader. This assumption allows us
// to bypass the ClassLoader resolution algorithm
// in resolveToFirstTimeUsedClassLoader() in all cases
// except when the TCCL has been replaced.
appMap.put(INIT_TIME_CL_KEY, new Integer(System.identityHashCode(cl)));
} else {
this.marker = val;
}
this.cl = resolveToFirstTimeUsedClassLoader(cl, extContext);
this.context = extContext.getContext();
}
/*
* Resolve the argument ClassLoader to be the ClassLoader that
* was passed in to the ctor the first time a FactoryManagerCacheKey
* was created for this web app.
*/
private ClassLoader resolveToFirstTimeUsedClassLoader(ClassLoader toResolve, ExternalContext extContext) {
ClassLoader curCL = toResolve;
ClassLoader resolved = null;
Map appMap = extContext.getApplicationMap();
// See if the argument curCL already is the web app class loader
Integer webAppCLHashCode = (Integer) appMap.get(INIT_TIME_CL_KEY);
boolean found = false;
if (null != webAppCLHashCode) {
int toResolveHashCode = System.identityHashCode(curCL);
while (!found && null != curCL) {
found = (toResolveHashCode == webAppCLHashCode);
if (!found) {
curCL = curCL.getParent();
toResolveHashCode = System.identityHashCode(curCL);
}
}
}
resolved = found ? curCL : toResolve;
return resolved;
}
//
ClassLoader getClassLoader() {
return cl;
}
Object getContext() {
return context;
}
private FactoryManagerCacheKey() {}
@Override
public boolean equals(Object obj) {
if (obj == null) {
return false;
}
if (getClass() != obj.getClass()) {
return false;
}
final FactoryManagerCacheKey other = (FactoryManagerCacheKey) obj;
if (this.cl != other.cl && (this.cl == null || !this.cl.equals(other.cl))) {
return false;
}
if (this.marker != other.marker && (this.marker == null || !this.marker.equals(other.marker))) {
return false;
}
return true;
}
@Override
public int hashCode() {
int hash = 7;
hash = 97 * hash + (this.cl != null ? this.cl.hashCode() : 0);
hash = 97 * hash + (this.marker != null ? this.marker.hashCode() : 0);
return hash;
}
}
} // END FactoryCache