/**
 *  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.storage.allocator;

import java.util.Map;
import java.util.Set;

import javax.ejb.Local;
import javax.naming.ConfigurationException;

import com.cloud.agent.api.to.DiskCharacteristicsTO;
import com.cloud.configuration.Config;
import com.cloud.configuration.dao.ConfigurationDao;
import com.cloud.dc.DataCenterVO;
import com.cloud.dc.HostPodVO;
import com.cloud.host.Host;
import com.cloud.service.ServiceOffering;
import com.cloud.storage.StoragePool;
import com.cloud.storage.VMTemplateVO;
import com.cloud.storage.Volume.VolumeType;
import com.cloud.utils.component.ComponentLocator;
import com.cloud.vm.VMInstanceVO;
import com.cloud.vm.VirtualMachine;

@Local(value=StoragePoolAllocator.class)
public class UseLocalForRootAllocator extends LocalStoragePoolAllocator implements StoragePoolAllocator {
    boolean _useLocalStorage;

    @Override
    public StoragePool allocateToPool(DiskCharacteristicsTO dskCh, ServiceOffering offering, DataCenterVO dc, HostPodVO pod, Long clusterId, VMInstanceVO vm, VMTemplateVO template, Set<? extends StoragePool> avoids) {
        if (!_useLocalStorage) {
            return null;
        }
        
        return super.allocateToPool(dskCh, offering, dc, pod, clusterId, vm, template, avoids);
    }

    @Override
    public String chooseStorageIp(VirtualMachine vm, Host host, Host storage) {
        return null;
    }
    
    @Override
    public boolean configure(String name, Map<String, Object> params) throws ConfigurationException {
        super.configure(name, params);
        
        ComponentLocator locator = ComponentLocator.getCurrentLocator();
        ConfigurationDao configDao = locator.getDao(ConfigurationDao.class);
        Map<String, String> dbParams = configDao.getConfiguration(params);
        
        _useLocalStorage = Boolean.parseBoolean(dbParams.get(Config.UseLocalStorage.toString()));
        
        return true;
    }
    
    @Override
    protected boolean localStorageAllocationNeeded(DiskCharacteristicsTO dskCh, VMInstanceVO vm, ServiceOffering offering) {
        if (dskCh.getType() == VolumeType.ROOT) {
            return true;
        } else if (dskCh.getType() == VolumeType.DATADISK) {
            return false;
        } else {
            return super.localStorageAllocationNeeded(dskCh, vm, offering);
        }
    }
    
    protected UseLocalForRootAllocator() {
    }
}