/*
* 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.topology;
/**
* Selects one of the triad members, given the triad owner.
*/
public class TriadDispatcherSingle<X> extends TriadDispatcher<X> {
private final X _valueA;
public TriadDispatcherSingle(X valueA)
{
_valueA = valueA;
if (valueA == null)
throw new NullPointerException();
}
/**
* Returns the member A.
*/
@Override
public X getA()
{
return _valueA;
}
/**
* Returns the primary server.
*/
@Override
public X primary(TriadOwner owner)
{
return _valueA;
}
/**
* Returns the secondary server.
*/
@Override
public X secondary(TriadOwner owner)
{
return null;
}
/**
* Returns the tertiary server.
*/
@Override
public X tertiary(TriadOwner owner)
{
return null;
}
}