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/*
* JBoss, Home of Professional Open Source.
* Copyright 2008, Red Hat Middleware LLC, 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.spring.aop;
import java.lang.annotation.Annotation;
import java.lang.reflect.Constructor;
import java.util.ArrayList;
import java.util.List;
import java.security.AccessController;
import java.security.PrivilegedAction;
import org.jboss.aop.Advisor;
import org.jboss.aop.AspectManager;
import org.jboss.aop.advice.Interceptor;
import org.jboss.aop.joinpoint.ConstructorInvocation;
import org.jboss.aop.proxy.container.AOPProxyFactory;
import org.jboss.aop.proxy.container.AOPProxyFactoryParameters;
import org.jboss.aop.proxy.container.ContainerCache;
import org.jboss.aop.proxy.container.GeneratedAOPProxyFactory;
import org.jboss.joinpoint.plugins.Config;
import org.jboss.metadata.spi.MetaData;
import org.jboss.metadata.spi.scope.CommonLevels;
import org.jboss.metadata.spi.scope.CommonLevelsUtil;
import org.jboss.metadata.spi.scope.ScopeLevel;
import org.jboss.metadata.spi.signature.DeclaredMethodSignature;
import org.jboss.metadata.spi.stack.MetaDataStack;
import org.jboss.reflect.spi.ClassInfo;
import org.jboss.reflect.spi.ConstructorInfo;
import org.jboss.reflect.spi.MethodInfo;
import org.jboss.reflect.spi.TypeInfo;
import org.jboss.config.spi.Configuration;
import org.jboss.config.plugins.property.PropertyConfiguration;
import org.springframework.aop.TargetSource;
import org.springframework.aop.framework.AdvisedSupport;
import org.springframework.aop.framework.AopProxy;
/**
* JBoss based AOP proxy.
*
* @author Ales Justin
*/
public class JBossAopProxy implements AopProxy
{
/** The configuration */
private static Configuration configuration;
private static final List levels;
static
{
// get Configuration instance
configuration = AccessController.doPrivileged(new PrivilegedAction()
{
public Configuration run()
{
return new PropertyConfiguration();
}
});
// get all sub INSTANCE levels
levels = new ArrayList(CommonLevelsUtil.getSubLevels(CommonLevels.INSTANCE));
// remove class joinpoint, we're only interested in instance/joinpoint_override
levels.remove(CommonLevels.JOINPOINT);
}
private AdvisedSupport config;
private AOPProxyFactory proxyFactory = new GeneratedAOPProxyFactory();
private ConstructorInfo constructorInfo;
public JBossAopProxy(AdvisedSupport config)
{
if (config == null)
throw new IllegalArgumentException("Null config");
this.config = config;
}
public Object getProxy()
{
return getProxy(null);
}
public Object getProxy(ClassLoader classLoader)
{
Class clazz = config.getTargetClass();
if (clazz == null)
throw new IllegalArgumentException("Null target class");
try
{
ClassInfo classInfo = configuration.getClassInfo(clazz);
constructorInfo = Config.findConstructorInfo(classInfo, new String[]{}); // TODO - arguments
MetaData metaData = MetaDataStack.peek();
boolean hasInstanceMetaData = rootHasSubInstanceMetaData(metaData);
AspectManager manager = AspectManagerFactory.getAspectManager(metaData);
ContainerCache cache = ContainerCache.initialise(manager, clazz, metaData, hasInstanceMetaData);
AOPProxyFactoryParameters params = new AOPProxyFactoryParameters();
Object target = null;
TargetSource ts = config.getTargetSource();
if (ts != null)
target = ts.getTarget();
if (target == null)
target = createTarget(cache, params);
params.setProxiedClass(target.getClass());
params.setMetaData(metaData);
params.setTarget(target);
params.setContainerCache(cache);
params.setMetaDataHasInstanceLevelData(hasInstanceMetaData);
return proxyFactory.createAdvisedProxy(params);
}
catch (Throwable t)
{
throw new RuntimeException(t);
}
}
/**
* Check for metadata at INSTANCE level and below.
*
* @param metaData the metadata
* @return true if there is some metadata that needs to be considered
*/
private boolean rootHasSubInstanceMetaData(MetaData metaData)
{
if (metaData == null)
{
return false;
}
if (checkForMetaDataAtSubInstanceLevel(metaData))
{
return true;
}
//Check for method annotations
return rootHasMethodWithSubInstanceMetaData(metaData);
}
/**
* Check for metadata at INSTANCE level and below for methods.
*
* @param metaData the metadata
* @return true if there is some metadata that needs to be considered
*/
private boolean rootHasMethodWithSubInstanceMetaData(MetaData metaData)
{
//Check for method annotations
ClassInfo info = constructorInfo.getDeclaringClass();
while (info != null)
{
MethodInfo[] methods = info.getDeclaredMethods();
if (methods != null)
{
for (MethodInfo mi : methods)
{
if (methodHasSubInstanceMetaData(metaData, mi))
{
return true;
}
}
}
info = info.getSuperclass();
}
return false;
}
/**
* Check for metadata at INSTANCE level and below for methods.
*
* @param metaData the metadata
* @param mi the method to check
* @return true if there is some metadata that needs to be considered
*/
private boolean methodHasSubInstanceMetaData(MetaData metaData, MethodInfo mi)
{
DeclaredMethodSignature sig = new DeclaredMethodSignature(mi);
MetaData methodMD = metaData.getComponentMetaData(sig);
return checkForMetaDataAtSubInstanceLevel(methodMD);
}
/**
* Check for metadata at INSTANCE level and below.
*
* @param metaData the metadata
* @return true if there is some metadata that needs to be considered
*/
private boolean checkForMetaDataAtSubInstanceLevel(MetaData metaData)
{
if (metaData != null)
{
for (ScopeLevel level : levels)
{
if (hasMetaDataAtLevel(metaData, level))
return true;
}
}
return false;
}
/**
* Check for metadata at level param.
*
* @param metaData the metadata
* @param level the scope level
* @return true if there is some metadata that needs to be considered
*/
protected boolean hasMetaDataAtLevel(MetaData metaData, ScopeLevel level)
{
MetaData levelMetaData = metaData.getScopeMetaData(level);
if (levelMetaData != null && levelMetaData.isEmpty() == false)
{
Object[] allMetaData = levelMetaData.getMetaData();
Annotation[] annotations = levelMetaData.getAnnotations();
// all meta data is not null, since level metadata is not empty
int allSize = allMetaData.length;
int annotationsSize = annotations != null ? annotations.length : 0;
// do we have something else than annotations
if (allSize > annotationsSize)
{
return true;
}
else if (annotationsSize > 0)
{
return true;
}
}
return false;
}
/**
* Create the target.
*
* @param cache the cache
* @param params the parameters
* @return target instance
* @throws Throwable for any error
*/
private Object createTarget(ContainerCache cache, AOPProxyFactoryParameters params) throws Throwable
{
Advisor advisor = cache.getAdvisor();
if (advisor != null)
{
org.jboss.aop.ConstructorInfo aopinfo = findAopConstructorInfo(advisor);
Interceptor[] interceptors = (aopinfo != null) ? aopinfo.getInterceptors() : null;
if (interceptors != null)
{
ConstructorInvocation inv = new ConstructorInvocation(aopinfo, aopinfo.getInterceptors());
inv.setArguments(getArguments());
return inv.invokeNext();
}
if (constructorInfo.getParameterTypes().length > 0)
{
Constructor constructor = null;
if (aopinfo == null)
{
//Fall back to using the class;
Class clazz = advisor.getClazz();
Constructor[] ctors = clazz.getConstructors();
for (Constructor ctor : ctors)
{
if (matchConstructor(ctor))
{
constructor = ctor;
break;
}
}
}
else
{
constructor = aopinfo.getConstructor();
}
params.setCtor(constructor.getParameterTypes(), getArguments());
}
}
return constructorInfo.newInstance(getArguments());
}
/**
* Find constructor info.
*
* @param advisor the advisor
* @return matched constructor or null if no match
*/
private org.jboss.aop.ConstructorInfo findAopConstructorInfo(Advisor advisor)
{
org.jboss.aop.ConstructorInfo[] infos = advisor.getConstructorInfos();
for (int i = 0 ; i < infos.length ; i++)
{
if (matchConstructor(infos[i].getConstructor()))
{
return infos[i];
}
}
return null;
}
/**
* Match constructor.
*
* @param ctor the constructor
* @return true if we have a match
*/
private boolean matchConstructor(Constructor ctor)
{
TypeInfo[] params = constructorInfo.getParameterTypes();
Class[] ctorParams = ctor.getParameterTypes();
if (params.length == ctorParams.length)
{
boolean match = true;
for (int p = 0 ; p < params.length ; p++)
{
if (!params[p].getName().equals(ctorParams[p].getName()))
{
match = false;
break;
}
}
if (match)
{
return true;
}
}
return false;
}
protected Object[] getArguments()
{
return new Object[]{}; // TODO - proper arguments
}
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