/* This file is part of VoltDB.
 * Copyright (C) 2008-2010 VoltDB L.L.C.
 *
 * VoltDB 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 3 of the License, or
 * (at your option) any later version.
 *
 * VoltDB 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with VoltDB.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.voltdb.compiler;

public class ClusterConfig
{
    
    public ClusterConfig() {
        // Nothing...
    }
    
    public ClusterConfig(int hostCount, int sitesPerHost,
                         int replicationFactor, String leaderAddress)
    {
        m_hostCount = hostCount;
        m_sitesPerHost = sitesPerHost;
        m_leaderAddress = leaderAddress;
        m_replicationFactor = replicationFactor;
        m_errorMsg = "Config is unvalidated";
    }

    public int getHostCount()
    {
        return m_hostCount;
    }

    public int getSitesPerHost()
    {
        return m_sitesPerHost;
    }

    public int getReplicationFactor()
    {
        return m_replicationFactor;
    }

    public String getLeaderAddress()
    {
        return m_leaderAddress;
    }

    public int getPartitionCount()
    {
        return (m_hostCount * m_sitesPerHost) / (m_replicationFactor + 1);
    }

    public String getErrorMsg()
    {
        return m_errorMsg;
    }

    public boolean validate()
    {
        if (m_hostCount <= 0)
        {
            m_errorMsg = "The number of hosts must be > 0.";
            return false;
        }
        if (m_sitesPerHost <= 0)
        {
            m_errorMsg = "The number of sites per host must be > 0.";
            return false;
        }
        if (m_hostCount <= m_replicationFactor)
        {
            m_errorMsg = String.format("Insufficient hosts (%d) to support K-safety of %d",
                                       m_hostCount, m_replicationFactor);
            return false;
        }
        if (getPartitionCount() == 0)
        {
            m_errorMsg = String.format("Insufficient execution site count to achieve K-safety of %d",
                                       m_replicationFactor);
            return false;
        }
        m_errorMsg = "Cluster config contains no detected errors";
        return true;
    }

    private int m_hostCount;
    private int m_sitesPerHost;
    private int m_replicationFactor;
    private String m_leaderAddress;

    private String m_errorMsg;
}