/*
* JBoss, Home of Professional Open Source.
* Copyright 2009, 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.exoplatform.container.mc.impl;
import org.exoplatform.container.mc.MCIntegration;
import org.exoplatform.services.log.ExoLogger;
import org.exoplatform.services.log.Log;
import org.jboss.beans.metadata.plugins.AbstractBeanMetaData;
import org.jboss.beans.metadata.spi.AnnotationMetaData;
import org.jboss.kernel.Kernel;
import org.jboss.kernel.plugins.dependency.AbstractKernelController;
import org.jboss.mc.common.ThreadLocalUtils;
import org.jboss.mc.servlet.vdf.api.VDFThreadLocalUtils;
import org.picocontainer.ComponentAdapter;
import javax.servlet.ServletContext;
import java.lang.annotation.Annotation;
import java.util.Set;
/**
* Implementation of MCIntegration that contains hard dependencies on JBoss Microcontainer.
*
* There is a reflection style dependency on this class in
* {@link org.exoplatform.container.mc.MCIntegrationInvoker}.
*
* @author <a href="mailto:mstrukel@redhat.com">Marko Strukelj</a>
*/
public class MCIntegrationImpl implements MCIntegration
{
/**
* Logger
*/
private static Log log = ExoLogger.getLogger("exo.kernel.mc-int.MCIntegrationImpl");
/**
* A singleton MCIntegration implementation
*/
private static MCIntegration mcint;
/**
* JBoss MC kernel controller that we use
*/
private AbstractKernelController rootController;
/**
* Configuration parser and holder
*/
private MCIntConfig conf;
/**
* A factory method. In principle can return different implementations based on the running environment.
* Currently only one implementation exists.
*/
public synchronized static MCIntegration getInstance()
{
if (mcint == null)
{
mcint = new MCIntegrationImpl();
}
return mcint;
}
/**
* Single constructor - private to force usage of factory method {@link MCIntegrationImpl#getInstance()}.
*/
private MCIntegrationImpl()
{
// load conf/mc-int-config.xml
conf = new MCIntConfig();
}
/**
* Get kernel controller associated with appropriate mc kernel
* @return kernel controller
*/
public synchronized AbstractKernelController getRootController()
{
if (rootController == null)
{
Kernel kernel = ThreadLocalUtils.getKernel();
if (kernel != null)
{
rootController = (AbstractKernelController) kernel.getController();
}
else
{
log.warn("GateIn - MC integration not available");
return null;
}
}
return rootController;
}
/**
* Check if component should pass through mc kernel injection based on class annotations,
* and mc-int-config.xml configuration.
* Wrap with intercepting component adapter (@link MCComponentAdapter} or return original adapter.
*
* @see MCIntegration#getMCAdapter(org.picocontainer.ComponentAdapter)
*/
public ComponentAdapter getMCAdapter(ComponentAdapter adapter)
{
InterceptMC interceptAnnotation = null;
AbstractBeanMetaData data = conf.getByAdapter(adapter);
if (data != null)
{
Set<AnnotationMetaData> annotationMetaData = data.getAnnotations();
if (annotationMetaData != null)
{
for (AnnotationMetaData annMeta : annotationMetaData)
{
Annotation ann = annMeta.getAnnotationInstance();
if (ann.annotationType() == InterceptMC.class)
{
interceptAnnotation = (InterceptMC) ann;
}
}
}
}
else
{
Class<?> clazz = adapter.getComponentImplementation();
interceptAnnotation = clazz.getAnnotation(InterceptMC.class);
}
if (interceptAnnotation == null)
{
return adapter;
}
AbstractKernelController controller = getRootController();
if (controller != null)
{
adapter = new MCComponentAdapter(controller, adapter, interceptAnnotation, data);
}
return adapter;
}
/**
* @see MCIntegration#hasMCKernel(org.picocontainer.ComponentAdapter)
*/
public boolean hasMCKernel(ComponentAdapter adapter)
{
return ThreadLocalUtils.getKernel() != null;
}
/**
* @see MCIntegration#initThreadCtx(javax.servlet.ServletContext)
*/
public void initThreadCtx(ServletContext ctx)
{
VDFThreadLocalUtils.init(ctx);
}
/**
* @see MCIntegration#resetThreadCtx(javax.servlet.ServletContext)
*/
public void resetThreadCtx(ServletContext ctx)
{
VDFThreadLocalUtils.reset();
}
}