/*
* Copyright (c) 1998-2011 Caucho Technology -- all rights reserved
*
* This file is part of Resin(R) Open Source
*
* Each copy or derived work must preserve the copyright notice and this
* notice unmodified.
*
* Resin Open Source is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Resin Open Source 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, or any warranty
* of NON-INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with Resin Open Source; if not, write to the
*
* Free Software Foundation, Inc.
* 59 Temple Place, Suite 330
* Boston, MA 02111-1307 USA
*
* @author Scott Ferguson
*/
package com.caucho.cloud.loadbalance;
import com.caucho.config.ConfigException;
import com.caucho.network.balance.ClientSocket;
import com.caucho.network.balance.ClientSocketFactory;
import com.caucho.util.L10N;
/**
* Manages a load balancer.
*/
public class SingleLoadBalanceManager extends CustomLoadBalanceManager {
private static final L10N L = new L10N(SingleLoadBalanceManager.class);
private ClientSocketFactory _serverPool;
public SingleLoadBalanceManager(String probeCategory)
{
super(probeCategory);
}
public void addAddress(String address)
{
if (_serverPool != null)
throw new ConfigException(L.l("Multiple backend load balancing requires Resin Professional."));
_serverPool = createServerPool(address);
}
public void init()
{
if (_serverPool == null)
throw new ConfigException(L.l("Load-balancing requires at least one server address."));
}
/**
* Opens the next available server.
*/
public ClientSocket openSticky(String sessionId, ClientSocketFactory oldSrun)
{
if (_serverPool == oldSrun)
return null;
return _serverPool.open();
}
}