/*
* 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.iiop;
import javax.naming.InitialContext;
import org.jboss.corba.ORBFactory;
import org.omg.CORBA.ORB;
/**
* Singleton class to ensure that all code running in the JBoss VM uses the
* same ORB instance. The CorbaORBService MBean calls CorbaORB.setInstance()
* at service creation time, after it creates an ORB instance. Code that runs
* both in the server VM and in client VM calls CorbaORB.getInstance() to get
* an ORB.
*
* @author <a href="mailto:reverbel@ime.usp.br">Francisco Reverbel</a>
* @version $Revision: 81018 $
*/
public class CorbaORB
{
/** The ORB instance in this VM. */
private static ORB instance;
/** Enforce non-instantiability. */
private CorbaORB()
{
}
/**
* This method is called only by the CorbaORBService MBean, so it has
* package visibility.
*/
static void setInstance(ORB orb)
{
if (instance == null)
instance = orb;
else
throw new RuntimeException(CorbaORB.class.getName()
+ ".setInstance() called more than once");
}
/**
* This method is called by classes that are used both at the server and at
* the client side: the handle impl (org.jboss.proxy.ejb.HandleImplIIOP),
* the home handle impl (org.jboss.proxy.ejb.HomeHandleImplIIOP),
* and the home factory (org.jboss.proxy.ejb.IIOPHomeFactory).
* When called by code running in the same VM as the the JBoss server,
* getInstance() returns the ORB instance used by the CorbaORBService MBean
* (which previously issued a setInstance() call). Otherwise getInstance()
* returns an ORB instance obtained with an ORB.init() call.
*/
public static ORB getInstance()
{
// No instance established, we must be on the client
// Use the orb consistent with java:comp/ORB (if any).
if (instance == null)
{
try
{
InitialContext ctx = new InitialContext();
instance = (ORB) ctx.lookup("java:comp/ORB");
}
catch (Exception ignored)
{
}
if (instance == null)
instance = ORBFactory.getORB();
}
return instance;
}
}