/*
* JBoss, Home of Professional Open Source
* Copyright 2010, Red Hat Inc., and individual contributors as indicated
* by the @authors tag. See the copyright.txt 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.as.ejb3.component.stateful;
import org.jboss.as.ee.component.ComponentView;
import org.jboss.ejb.client.SessionID;
import org.jboss.invocation.ImmediateInterceptorFactory;
import org.jboss.invocation.Interceptor;
import org.jboss.invocation.InterceptorContext;
import org.jboss.invocation.InterceptorFactory;
/**
* Interceptor for equals / hashCode for SFSB's
*
* @author Stuart Douglas
*/
public class StatefulIdentityInterceptor implements Interceptor {
public static final InterceptorFactory FACTORY = new ImmediateInterceptorFactory(new StatefulIdentityInterceptor());
private StatefulIdentityInterceptor() {
}
@Override
public Object processInvocation(final InterceptorContext context) throws Exception {
if (context.getMethod().getName().equals("equals")
|| context.getMethod().getName().equals("isIdentical")) {
final Object other = context.getParameters()[0];
final ComponentView componentView = context.getPrivateData(ComponentView.class);
final Class<?> proxyType = componentView.getProxyClass();
final SessionID sessionId = context.getPrivateData(SessionID.class);
if( proxyType.isAssignableFrom(other.getClass())) {
//now we know that this is an ejb for the correct component view
//as digging out the session id from the proxy object is not really
//a viable option, we invoke equals() for the other instance with a
//SessionIdHolder as the other side
return other.equals(new SessionIdHolder(sessionId));
} else if(other instanceof SessionIdHolder) {
return sessionId.equals( ((SessionIdHolder)other).sessionId);
} else {
return false;
}
} else if (context.getMethod().getName().equals("hashCode")) {
final SessionID sessionId = context.getPrivateData(SessionID.class);
//use the identity of the component view as a hash code
return sessionId.hashCode();
} else {
return context.proceed();
}
}
private static class SessionIdHolder {
private final SessionID sessionId;
public SessionIdHolder(final SessionID sessionId) {
this.sessionId = sessionId;
}
}
}