| // Licensed to the Apache Software Foundation (ASF) under one |
| // or more contributor license agreements. See the NOTICE file |
| // distributed with this work for additional information |
| // regarding copyright ownership. The ASF licenses this file |
| // to you under the Apache License, Version 2.0 (the |
| // "License"); you may not use this file except in compliance |
| // with 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. |
| package com.cloud.netapp; |
| |
| import java.rmi.ServerException; |
| import java.util.HashMap; |
| import java.util.List; |
| |
| import org.apache.log4j.Logger; |
| |
| public class NetappDefaultAllocatorImpl implements NetappAllocator { |
| private static HashMap<String, Integer> s_poolNameToLastVolumeIdAllocated = new HashMap<String, Integer>(); |
| private final NetappManager _netappMgr; |
| public static final Logger s_logger = Logger.getLogger(NetappDefaultAllocatorImpl.class.getName()); |
| |
| public NetappDefaultAllocatorImpl(NetappManager netappMgr) { |
| _netappMgr = netappMgr; |
| } |
| |
| @Override |
| 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 |
| */ |
| @Override |
| 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 (s_poolNameToLastVolumeIdAllocated.get(poolName) == null) { |
| pos = 0; |
| } else { |
| pos = s_poolNameToLastVolumeIdAllocated.get(poolName); |
| } |
| |
| //update for RR effect |
| s_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; |
| } |
| |
| } |