/*
* JBoss, Home of Professional Open Source.
* Copyright 2012, 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.jboss.as.web.deployment;
import java.io.File;
import java.io.FileInputStream;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.List;
import java.util.Properties;
import javax.el.BeanELResolver;
import javax.el.ExpressionFactory;
import org.apache.el.ExpressionFactoryImpl;
import org.jboss.as.server.deployment.Attachments;
import org.jboss.as.server.deployment.DeploymentPhaseContext;
import org.jboss.as.server.deployment.DeploymentUnit;
import org.jboss.as.server.deployment.DeploymentUnitProcessingException;
import org.jboss.as.server.deployment.DeploymentUnitProcessor;
import org.jboss.as.server.deployment.ServicesAttachment;
import org.jboss.as.web.WebLogger;
import org.jboss.el.cache.FactoryFinderCache;
import org.jboss.modules.Module;
/**
* Processor that handles {@link javax.el.ExpressionFactory} instances that are found in the deployment.
* This resolves a performance issue.
*
* @author Stuart Douglas
* @see https://issues.jboss.org/browse/AS7-5026
*/
public class ELExpressionFactoryProcessor implements DeploymentUnitProcessor {
public static final String FACTORY_ID = ExpressionFactory.class.getName();
private static final Method purge;
static {
try {
purge = BeanELResolver.class.getDeclaredMethod("purgeBeanClasses", ClassLoader.class);
purge.setAccessible(true);
} catch (NoSuchMethodException e) {
throw new RuntimeException(e);
}
}
@Override
public void deploy(final DeploymentPhaseContext phaseContext) throws DeploymentUnitProcessingException {
final DeploymentUnit deploymentUnit = phaseContext.getDeploymentUnit();
final Module module = deploymentUnit.getAttachment(Attachments.MODULE);
if (module == null) {
return;
}
final ServicesAttachment services = deploymentUnit.getAttachment(Attachments.SERVICES);
final List<String> implementations = services.getServiceImplementations(ExpressionFactory.class.getName());
if (implementations != null && implementations.size() > 0) {
FactoryFinderCache.addCacheEntry(module.getClassLoader(), FACTORY_ID, implementations.get(0));
}
// try to read from $java.home/lib/el.properties
try {
String javah = System.getProperty("java.home");
String configFile = javah + File.separator +
"lib" + File.separator + "el.properties";
File f = new File(configFile);
if (f.exists()) {
Properties props = new Properties();
props.load(new FileInputStream(f));
String factoryClassName = props.getProperty(FACTORY_ID);
FactoryFinderCache.addCacheEntry(module.getClassLoader(), FACTORY_ID, factoryClassName);
}
} catch (Exception ex) {
}
// Use the system property
try {
String systemProp =
System.getProperty(FACTORY_ID);
if (systemProp != null) {
FactoryFinderCache.addCacheEntry(module.getClassLoader(), FACTORY_ID, systemProp);
}
} catch (SecurityException se) {
}
FactoryFinderCache.addCacheEntry(module.getClassLoader(), FACTORY_ID, ExpressionFactoryImpl.class.getName());
}
@Override
public void undeploy(final DeploymentUnit deploymentUnit) {
final Module module = deploymentUnit.getAttachment(Attachments.MODULE);
if(module != null) {
FactoryFinderCache.clearClassLoader(module.getClassLoader());
try {
//TODO: this method should be static
purge.invoke(new BeanELResolver(), module.getClassLoader());
} catch (Exception e) {
WebLogger.ROOT_LOGGER.couldNotPurgeELCache(e);
}
}
}
}