/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.myfaces.config.annotation;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.commons.discovery.resource.ClassLoaders;
import org.apache.commons.discovery.resource.names.DiscoverServiceNames;
import org.apache.commons.discovery.ResourceNameIterator;
import org.apache.myfaces.buildtools.maven2.plugin.builder.annotation.JSFWebConfigParam;
import org.apache.myfaces.shared_impl.util.ClassUtils;
import javax.faces.context.ExternalContext;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Constructor;
/*
* Date: Mar 12, 2007
* Time: 9:53:40 PM
*/
public class DefaultLifecycleProviderFactory extends LifecycleProviderFactory {
private static Log log = LogFactory.getLog(DefaultLifecycleProviderFactory.class);
private static LifecycleProvider LIFECYCLE_PROVIDER_INSTANCE;
@JSFWebConfigParam(name="org.apache.myfaces.config.annotation.LifecycleProvider", since="1.1")
public static final String LIFECYCLE_PROVIDER = LifecycleProvider.class.getName();
public DefaultLifecycleProviderFactory()
{
}
public LifecycleProvider getLifecycleProvider(ExternalContext externalContext)
{
if (LIFECYCLE_PROVIDER_INSTANCE == null)
{
if (externalContext == null)
{
log.info("No ExternalContext using fallback LifecycleProvider.");
resolveFallbackLifecycleProvider();
}
else
{
if (!resolveLifecycleProviderFromExternalContext(externalContext))
{
if (!resolveLifecycleProviderFromService(externalContext))
{
resolveFallbackLifecycleProvider();
}
}
}
log.info("Using LifecycleProvider "+ LIFECYCLE_PROVIDER_INSTANCE.getClass().getName());
}
return LIFECYCLE_PROVIDER_INSTANCE;
}
public void release() {
LIFECYCLE_PROVIDER_INSTANCE = null;
}
private boolean resolveLifecycleProviderFromExternalContext(ExternalContext externalContext)
{
try
{
String lifecycleProvider = externalContext.getInitParameter(LIFECYCLE_PROVIDER);
if (lifecycleProvider != null)
{
Object obj = createClass(lifecycleProvider, externalContext);
if (obj instanceof LifecycleProvider) {
LIFECYCLE_PROVIDER_INSTANCE = (LifecycleProvider) obj;
return true;
}
}
}
catch (ClassNotFoundException e)
{
log.error("", e);
}
catch (InstantiationException e)
{
log.error("", e);
}
catch (IllegalAccessException e)
{
log.error("", e);
}
catch (InvocationTargetException e)
{
log.error("", e);
}
return false;
}
private boolean resolveLifecycleProviderFromService(ExternalContext externalContext) {
ClassLoader classLoader = ClassUtils.getContextClassLoader();
ClassLoaders loaders = new ClassLoaders();
loaders.put(classLoader);
DiscoverServiceNames dsn = new DiscoverServiceNames(loaders);
ResourceNameIterator iter = dsn.findResourceNames(LIFECYCLE_PROVIDER);
while (iter.hasNext()) {
String className = iter.nextResourceName();
try
{
Object obj = createClass(className, externalContext);
if (DiscoverableLifecycleProvider.class.isAssignableFrom(obj.getClass())) {
DiscoverableLifecycleProvider discoverableLifecycleProvider =
(DiscoverableLifecycleProvider) obj;
if (discoverableLifecycleProvider.isAvailable()) {
LIFECYCLE_PROVIDER_INSTANCE = discoverableLifecycleProvider;
return true;
}
}
}
catch (ClassNotFoundException e)
{
// ignore
}
catch (NoClassDefFoundError e)
{
// ignore
}
catch (InstantiationException e)
{
log.error("", e);
}
catch (IllegalAccessException e)
{
log.error("", e);
}
catch (InvocationTargetException e)
{
log.error("", e);
}
}
return false;
}
private Object createClass(String className, ExternalContext externalContext)
throws InstantiationException, IllegalAccessException, InvocationTargetException, ClassNotFoundException
{
Class clazz = ClassUtils.classForName(className);
Object obj;
try
{
Constructor constructor = clazz.getConstructor(ExternalContext.class);
obj = constructor.newInstance(externalContext);
}
catch (NoSuchMethodException e)
{
obj = clazz.newInstance();
}
return obj;
}
private void resolveFallbackLifecycleProvider()
{
try
{
ClassUtils.classForName("javax.annotation.PreDestroy");
}
catch (ClassNotFoundException e)
{
// no annotation available don't process annotations
LIFECYCLE_PROVIDER_INSTANCE = new NoAnnotationLifecyleProvider();
return;
}
Context context;
try
{
context = new InitialContext();
try
{
ClassUtils.classForName("javax.ejb.EJB");
// Asume full JEE 5 container
LIFECYCLE_PROVIDER_INSTANCE = new AllAnnotationLifecycleProvider(context);
}
catch (ClassNotFoundException e)
{
// something else
LIFECYCLE_PROVIDER_INSTANCE = new ResourceAnnotationLifecycleProvider(context);
}
}
catch (NamingException e)
{
// no initial context available no injection
LIFECYCLE_PROVIDER_INSTANCE = new NoInjectionAnnotationLifecycleProvider();
log.error("No InitialContext found. Using NoInjectionAnnotationProcessor.", e);
}
}
}