/*
* 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.framework.server;
import java.net.InetAddress;
import java.net.UnknownHostException;
import org.jboss.ha.framework.interfaces.ClusterNode;
import org.jgroups.stack.IpAddress;
/**
* Replacement for a JG IpAddress that doesn't base its representation
* on the JG address but on the computed node name added to the IPAddress instead.
* This is to avoid any problem in the cluster as some nodes may interpret a node name
* differently (IP resolution, name case, FQDN or host name, etc.)
*
* @see org.jboss.ha.framework.server.ClusterPartitionMBean
*
* @author <a href="mailto:sacha.labourey@jboss.org">Sacha Labourey</a>.
* @author Brian Stansberry
* @author <a href="mailto:galder.zamarreno@jboss.com">Galder Zamarreno</a>
* @version $Revision: 85945 $
*/
public class ClusterNodeImpl
implements ClusterNode
{
// Constants -----------------------------------------------------
/** The serialVersionUID */
private static final long serialVersionUID = 2713397663824031616L;
// Attributes ----------------------------------------------------
protected final String id;
protected String jgId = null;
protected final IpAddress originalJGAddress;
// Static --------------------------------------------------------
// Constructors --------------------------------------------------
public ClusterNodeImpl(IpAddress jgAddress)
{
if (jgAddress.getAdditionalData() == null)
{
this.id = jgAddress.getIpAddress().getHostAddress() + ":" + jgAddress.getPort();
}
else
{
this.id = new String(jgAddress.getAdditionalData());
}
this.originalJGAddress = jgAddress;
}
// Public --------------------------------------------------------
public String getName()
{
return this.id;
}
public String getJGName()
{
if (jgId == null)
{
jgId = createJGName();
}
return jgId;
}
public IpAddress getOriginalJGAddress()
{
return this.originalJGAddress;
}
public InetAddress getIpAddress()
{
return this.originalJGAddress.getIpAddress();
}
public int getPort()
{
return this.originalJGAddress.getPort();
}
// Comparable implementation ----------------------------------------------
// Comparable implementation ----------------------------------------------
public int compareTo(Object o)
{
if ((o == null) || !(o instanceof ClusterNodeImpl))
throw new ClassCastException("ClusterNode.compareTo(): comparison between different classes");
ClusterNodeImpl other = (ClusterNodeImpl) o;
return this.id.compareTo(other.id);
}
// java.lang.Object overrides ---------------------------------------------------
public boolean equals(Object obj)
{
if (obj == null || !(obj instanceof ClusterNodeImpl)) return false;
ClusterNodeImpl other = (ClusterNodeImpl) obj;
return this.id.equals(other.id);
}
public int hashCode()
{
return id.hashCode();
}
public String toString()
{
return this.getName();
}
// Package protected ---------------------------------------------
// Protected -----------------------------------------------------
protected String getShortName(String hostname)
{
int index = hostname.indexOf('.');
if (hostname == null) return "";
if (index > 0 && !Character.isDigit(hostname.charAt(0)))
return hostname.substring(0, index);
else
return hostname;
}
protected String createJGName()
{
StringBuffer sb = new StringBuffer();
java.net.InetAddress jgIPAddr = originalJGAddress.getIpAddress();
if (jgIPAddr == null)
sb.append("<null>");
else
{
if (jgIPAddr.isMulticastAddress())
sb.append(jgIPAddr.getHostAddress());
else
sb.append(getShortName(getFastHostName(jgIPAddr)));
}
sb.append(":" + originalJGAddress.getPort());
return sb.toString();
}
// Private -------------------------------------------------------
/**
* Tries to determine the hostname of the given InetAddress without
* triggering a reverse DNS lookup. Tries to parse a symbolic hostname
* from {@link InetAddress.toString()}, which is documented to return a
* String of the form "symbolicname/ipaddress" with 'symbolicname' blank
* if not stored in the object.
* <p/>
* If the symbolic name cannot be determined from InetAddress.toString(),
* the value of {@link InetAddress.getHostAddress()} is returned.
*/
private static String getFastHostName(InetAddress address)
{
String result = null;
String hostAddress = address.getHostAddress();
String inetAddr = address.toString();
int idx = inetAddr.lastIndexOf('/');
int idx1 = inetAddr.indexOf(hostAddress);
if (idx1 == idx + 1)
{
if (idx == 0)
result = hostAddress;
else
result = inetAddr.substring(0, idx);
}
else
{
// Doesn't follow the toString() contract!
result = hostAddress;
}
return result;
}
// Inner classes -------------------------------------------------
}