/**
 *  Copyright (C) 2010 Cloud.com, Inc.  All rights reserved.
 * 
 * This software is licensed under the GNU General Public License v3 or later.
 * 
 * It 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 any later version.
 * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 * 
 */
package com.cloud.ha;

import com.cloud.host.HostVO;
import com.cloud.host.Status;
import com.cloud.utils.component.Adapter;
import com.cloud.vm.VMInstanceVO;

public interface Investigator extends Adapter {
    /**
     * Returns if the vm is still alive.
     * 
     * @param vm to work on.
     * @return null if not sure.  true if sure it is alive.  false if sure it is not.
     */
    public Boolean isVmAlive(VMInstanceVO vm, HostVO host);

    public Status isAgentAlive(HostVO agent);
}