// Copyright 2012 Citrix Systems, Inc. Licensed under the
// Apache License, Version 2.0 (the "License"); you may not use this
// file except in compliance with the License. Citrix Systems, Inc.
// reserves all rights not expressly granted by the License.
// You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// Automatically generated by addcopyright.py at 04/03/2012
package com.cloud.netapp;
import java.io.IOException;
import java.rmi.ServerException;
import java.util.HashMap;
import java.util.List;
import org.apache.log4j.Logger;
import netapp.manage.NaException;
public class NetappDefaultAllocatorImpl implements NetappAllocator
{
private static HashMap<String, Integer> _poolNameToLastVolumeIdAllocated = new HashMap<String, Integer>();
private NetappManager _netappMgr;
public static final Logger s_logger = Logger.getLogger(NetappDefaultAllocatorImpl.class.getName());
public NetappDefaultAllocatorImpl(NetappManager netappMgr) {
_netappMgr = netappMgr;
}
public synchronized NetappVolumeVO chooseLeastFullVolumeFromPool(String poolName, long lunSizeGb)
{
List<NetappVolumeVO> volumesOnPoolAscending = _netappMgr.listVolumesAscending(poolName);
if(volumesOnPoolAscending==null)
{
//no pools exist in db
return null;
}
long maxAvailable = 0;
NetappVolumeVO selectedVol = null;
for(NetappVolumeVO vol : volumesOnPoolAscending)
{
try {
long availableBytes = _netappMgr.returnAvailableVolumeSize(vol.getVolumeName(), vol.getUsername(), vol.getPassword(), vol.getIpAddress());
if(lunSizeGb <= bytesToGb(availableBytes) && availableBytes>maxAvailable)
{
maxAvailable = availableBytes; //new max
selectedVol = vol; //new least loaded vol
}
} catch (ServerException se) {
s_logger.debug("Ignoring failure to obtain volume size for volume " + vol.getVolumeName());
continue;
}
}
return selectedVol;
}
/**
* This method does the actual round robin allocation
* @param poolName
* @param lunSizeGb
* @return -- the selected volume to create the lun on
* @throws IOException
* @throws NaException
*/
public synchronized NetappVolumeVO chooseVolumeFromPool(String poolName, long lunSizeGb)
{
int pos = 0; //0 by default
List<NetappVolumeVO> volumesOnPoolAscending = _netappMgr.listVolumesAscending(poolName);
if(volumesOnPoolAscending==null)
{
//no pools exist in db
return null;
}
//get the index of the record from the map
if(_poolNameToLastVolumeIdAllocated.get(poolName)==null)
{
pos=0;
}
else
{
pos=_poolNameToLastVolumeIdAllocated.get(poolName);
}
//update for RR effect
_poolNameToLastVolumeIdAllocated.put(poolName, (pos+1)%volumesOnPoolAscending.size());
//now iterate over the records
Object[] volumesOnPoolAscendingArray = volumesOnPoolAscending.toArray();
int counter=0;
while (counter < volumesOnPoolAscendingArray.length)
{
NetappVolumeVO vol = (NetappVolumeVO)volumesOnPoolAscendingArray[pos];
//check if the volume fits the bill
long availableBytes;
try {
availableBytes = _netappMgr.returnAvailableVolumeSize(vol.getVolumeName(), vol.getUsername(), vol.getPassword(), vol.getIpAddress());
if(lunSizeGb <= bytesToGb(availableBytes))
{
//found one
return vol;
}
pos = (pos + 1) % volumesOnPoolAscendingArray.length;
counter++;
} catch (ServerException e) {
s_logger.debug("Ignoring failure to obtain volume size for volume " + vol.getVolumeName());
continue;
}
}
return null;
}
/**
* This method does the byte to gb conversion
* @param bytes
* @return -- converted gb
*/
private long bytesToGb(long bytes){
long returnVal = (bytes/(1024*1024*1024));
return returnVal;
}
}