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package javax.faces;
import java.lang.reflect.Field;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.faces.context.FacesContext;
import javax.faces.context.FacesContextFactory;
import javax.faces.lifecycle.Lifecycle;
import javax.servlet.ServletContext;
/*
* Bug 20458755
* This class provides a utility method to look up the current FacesContext
* without performing the additional check introduced in FacesContext.getCurrentInstance()
* by this bug fix.
* This class also is a FacesContextFactory implementation that ignores
* all arguments and is able to look up the FacesContext corresponding
* to the ServletContext corresponding to the current Thread context ClassLoader.
* This FacesContextFactory implementation is used by FacesContext.getCurrentInstance()
* so that the init FacesContext can be correctly looked up regardless of
* thread re-use.
*/
final class ServletContextFacesContextFactory extends FacesContextFactory {
static final String SERVLET_CONTEXT_FINDER_NAME = "com.sun.faces.ServletContextFacesContextFactory";
static final String SERVLET_CONTEXT_FINDER_REMOVAL_NAME = "com.sun.faces.ServletContextFacesContextFactory_Removal";
private static final Logger LOGGER;
static {
LOGGER = Logger.getLogger("javax.faces", "javax.faces.LogStrings");
}
private ThreadLocal facesContextCurrentInstance;
private ConcurrentHashMap facesContextThreadInitContextMap;
private ConcurrentHashMap initContextServletContextMap;
ServletContextFacesContextFactory() {
try {
Field instanceField = FacesContext.class.getDeclaredField("instance");
instanceField.setAccessible(true);
facesContextCurrentInstance = (ThreadLocal) instanceField.get(null);
Field threadInitContextMapField = FacesContext.class.getDeclaredField("threadInitContext");
threadInitContextMapField.setAccessible(true);
facesContextThreadInitContextMap = (ConcurrentHashMap) threadInitContextMapField.get(null);
Field initContextServletContextMapField = FacesContext.class.getDeclaredField("initContextServletContext");
initContextServletContextMapField.setAccessible(true);
initContextServletContextMap = (ConcurrentHashMap) initContextServletContextMapField.get(null);
} catch (IllegalAccessException ex) {
if (LOGGER.isLoggable(Level.SEVERE)) {
LOGGER.log(Level.SEVERE, "Unable to access instance field of FacesContext", ex);
}
} catch (IllegalArgumentException ex) {
if (LOGGER.isLoggable(Level.SEVERE)) {
LOGGER.log(Level.SEVERE, "Unable to access instance field of FacesContext", ex);
}
} catch (NoSuchFieldException ex) {
if (LOGGER.isLoggable(Level.SEVERE)) {
LOGGER.log(Level.SEVERE, "Unable to access instance field of FacesContext", ex);
}
} catch (SecurityException ex) {
if (LOGGER.isLoggable(Level.SEVERE)) {
LOGGER.log(Level.SEVERE, "Unable to access instance field of FacesContext", ex);
}
}
}
/*
* This method does what FacesContext.getCurrentInstance() did *before*
* the fix for Bug 20458755.
*/
FacesContext getFacesContextWithoutServletContextLookup() {
FacesContext result = facesContextCurrentInstance.get();
if (null == result) {
if (null != facesContextThreadInitContextMap && !facesContextThreadInitContextMap.isEmpty()) {
result = facesContextThreadInitContextMap.get(Thread.currentThread());
}
}
return result;
}
/*
* Consult the initContextServletContextMap (reflectively obtained from
* the FacesContext in our ctor). If it is non-empty, obtain
* the ServletContext corresponding to the current Thread's context ClassLoader.
* If found, use the initContextServletContextMap to find the FacesContext
* corresponding to that ServletContext.
*/
@Override
public FacesContext getFacesContext(Object context, Object request, Object response, Lifecycle lifecycle) throws FacesException {
FacesContext result = null;
if (null != initContextServletContextMap && !initContextServletContextMap.isEmpty()) {
ServletContext servletContext = (ServletContext) FactoryFinder.FACTORIES_CACHE.getServletContextForCurrentClassLoader();
if (null != servletContext) {
for (Map.Entry entry : initContextServletContextMap.entrySet()) {
if (servletContext.equals(entry.getValue())) {
result = entry.getKey();
break;
}
}
}
}
return result;
}
}