/**
* EasyBeans
* Copyright (C) 2006 Bull S.A.S.
* Contact: easybeans@ow2.org
*
* This library 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 any later version.
*
* This library 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 library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*
* --------------------------------------------------------------------------
* $Id: JOnASENCInterceptor.java 5369 2010-02-24 14:58:19Z benoitf $
* --------------------------------------------------------------------------
*/
package org.ow2.easybeans.naming.interceptors;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import javax.naming.Context;
import org.ow2.easybeans.api.EasyBeansInvocationContext;
import org.ow2.easybeans.api.naming.NamingInterceptor;
/**
* Interceptor used when EasyBeans is integrated in JOnAS. As the java:
* namespace is managed by JOnAS, EasyBeans needs to call JOnAS objects to set
* java: context.
* @author Florent Benoit
*/
public class JOnASENCInterceptor extends AbsENCInterceptor implements NamingInterceptor {
/**
* JOnAS's class for naming.
*/
protected static final String JONAS_NAMING_MANAGER_CLASS = "org.objectweb.jonas.naming.NamingManager";
/**
* Reference on the JOnAS naming manager.
*/
private Object jonasNamingManager = null;
/**
* Method used to set the component context on the JOnAS naming manager.
*/
private Method setComponentContextMethod = null;
/**
* Method used to reset the component context on the JOnAS naming manager.
*/
private Method resetComponentContextMethod = null;
/**
* Default constructor. Gets a reference on the JOnAS naming manager and the
* methods that will be called
*/
public JOnASENCInterceptor() {
// Get reference on naming manager and its methods.
if (this.jonasNamingManager == null) {
String errMsg = "Check that EasyBeans is embedded in JOnAS application server.";
Class<?> namingClass = null;
try {
namingClass = Thread.currentThread().getContextClassLoader().loadClass(JONAS_NAMING_MANAGER_CLASS);
} catch (ClassNotFoundException e) {
throw new IllegalStateException("Cannot load the JOnAS naming manager class '"
+ JONAS_NAMING_MANAGER_CLASS + "'. " + errMsg, e);
}
// get method (getInstance)
Method getInstance;
try {
getInstance = namingClass.getMethod("getInstance");
} catch (SecurityException e) {
throw new IllegalStateException("Cannot get a method on the JOnAS naming manager class '"
+ JONAS_NAMING_MANAGER_CLASS + "'. " + errMsg, e);
} catch (NoSuchMethodException e) {
throw new IllegalStateException("Cannot get a method on the JOnAS naming manager class '"
+ JONAS_NAMING_MANAGER_CLASS + "'. " + errMsg, e);
}
// call this method (null as it is a static method)
try {
this.jonasNamingManager = getInstance.invoke(null);
} catch (IllegalArgumentException e) {
throw new IllegalStateException("Cannot get the the JOnAS naming manager instance'. " + errMsg, e);
} catch (IllegalAccessException e) {
throw new IllegalStateException("Cannot get the the JOnAS naming manager instance'. " + errMsg, e);
} catch (InvocationTargetException e) {
throw new IllegalStateException("Cannot get the the JOnAS naming manager instance'. " + errMsg, e);
}
// get methods
try {
this.setComponentContextMethod = namingClass.getMethod("setComponentContext", new Class[] {Context.class});
} catch (SecurityException e) {
throw new IllegalStateException(
"Cannot get setComponentContext(Context) method on the JOnAS naming manager class '"
+ JONAS_NAMING_MANAGER_CLASS + "'. " + errMsg, e);
} catch (NoSuchMethodException e) {
throw new IllegalStateException(
"Cannot get setComponentContext(Context) method on the JOnAS naming manager class '"
+ JONAS_NAMING_MANAGER_CLASS + "'. " + errMsg, e);
}
try {
this.resetComponentContextMethod = namingClass.getMethod("resetComponentContext",
new Class[] {Context.class});
} catch (SecurityException e) {
throw new IllegalStateException(
"Cannot get resetComponentContext(Context) method on the JOnAS naming manager class '"
+ JONAS_NAMING_MANAGER_CLASS + "'. " + errMsg, e);
} catch (NoSuchMethodException e) {
throw new IllegalStateException(
"Cannot get resetComponentContext(Context) method on the JOnAS naming manager class '"
+ JONAS_NAMING_MANAGER_CLASS + "'. " + errMsg, e);
}
}
}
/**
* Sets JOnAS ENC context.
* @param invocationContext context with useful attributes on the current
* invocation.
* @return result of the next invocation (to chain interceptors).
* @throws Exception needs for signature of interceptor.
*/
@Override
public Object intercept(final EasyBeansInvocationContext invocationContext) throws Exception {
Context oldContext = (Context) this.setComponentContextMethod.invoke(this.jonasNamingManager, invocationContext
.getFactory().getJavaContext());
try {
return invocationContext.proceed();
} finally {
this.resetComponentContextMethod.invoke(this.jonasNamingManager, oldContext);
}
}
}