/*
* 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.ha.jndi;
import org.jboss.ha.framework.interfaces.ClusterNode;
import org.jboss.ha.framework.interfaces.ResponseFilter;
import org.jboss.ha.framework.server.ClusterPartition.NoHandlerForRPC;
import org.jboss.logging.Logger;
/**
* This is a response filter that will stop waiting for responses as soon as it has received a
* response that's neither null, nor Exception, nor NoHandlerForRPC. This allows for example
* HAJNDI calls to return as soon as cluster wide lookup has succeeded in a node.
*
* @author Galder ZamarreƱo
*/
public class LookupSucceededFilter implements ResponseFilter
{
private static final Logger log = Logger.getLogger(LookupSucceededFilter.class);
private static final boolean trace = log.isTraceEnabled();
private volatile boolean lookupSucceeded;
public boolean isAcceptable(Object response, ClusterNode sender)
{
if (trace)
{
log.trace("isAcceptable (" + response + ") from " + sender);
}
if ((response != null) && !(response instanceof Exception) && !(response instanceof NoHandlerForRPC))
{
if (trace)
{
log.trace("Lookup succeded from " + sender);
}
lookupSucceeded = true;
}
// NOTE: *MUST* always return true or the RPC will never complete
// if no response is "acceptable". Returning true cause the response
// count to be incremented, allowing the call to complete when the
// desired numbers of responses are in
return true;
}
public boolean needMoreResponses()
{
return !(lookupSucceeded);
}
}