Java tutorial
/************************************************************************* * Copyright 2009-2015 Eucalyptus Systems, Inc. * * This program 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; version 3 of the License. * * 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/. * * Please contact Eucalyptus Systems, Inc., 6755 Hollister Ave., Goleta * CA 93117, USA or visit http://www.eucalyptus.com/licenses/ if you need * additional information or have any questions. * * This file may incorporate work covered under the following copyright * and permission notice: * * Software License Agreement (BSD License) * * Copyright (c) 2008, Regents of the University of California * All rights reserved. * * Redistribution and use of this software in source and binary forms, * with or without modification, are permitted provided that the * following conditions are met: * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer * in the documentation and/or other materials provided with the * distribution. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. USERS OF THIS SOFTWARE ACKNOWLEDGE * THE POSSIBLE PRESENCE OF OTHER OPEN SOURCE LICENSED MATERIAL, * COPYRIGHTED MATERIAL OR PATENTED MATERIAL IN THIS SOFTWARE, * AND IF ANY SUCH MATERIAL IS DISCOVERED THE PARTY DISCOVERING * IT MAY INFORM DR. RICH WOLSKI AT THE UNIVERSITY OF CALIFORNIA, * SANTA BARBARA WHO WILL THEN ASCERTAIN THE MOST APPROPRIATE REMEDY, * WHICH IN THE REGENTS' DISCRETION MAY INCLUDE, WITHOUT LIMITATION, * REPLACEMENT OF THE CODE SO IDENTIFIED, LICENSING OF THE CODE SO * IDENTIFIED, OR WITHDRAWAL OF THE CODE CAPABILITY TO THE EXTENT * NEEDED TO COMPLY WITH ANY SUCH LICENSES OR RIGHTS. ************************************************************************/ package com.eucalyptus.blockstorage.async; import java.util.Date; import java.util.List; import java.util.NoSuchElementException; import org.apache.log4j.Logger; import com.eucalyptus.blockstorage.LogicalStorageManager; import com.eucalyptus.blockstorage.entities.VolumeInfo; import com.eucalyptus.blockstorage.entities.VolumeToken; import com.eucalyptus.blockstorage.util.StorageProperties; import com.eucalyptus.entities.Entities; import com.eucalyptus.entities.TransactionException; import com.eucalyptus.entities.TransactionResource; import com.eucalyptus.entities.Transactions; import com.eucalyptus.storage.common.CheckerTask; import com.eucalyptus.util.EucalyptusCloudException; import com.google.common.base.Function; import com.google.common.base.Predicate; import com.google.common.collect.Iterables; import edu.ucsb.eucalyptus.util.EucaSemaphoreDirectory; /** * Checker task for removing volumes marked in deleting status * * @author Swathi Gangisetty * */ public class VolumeDeleter extends CheckerTask { private static Logger LOG = Logger.getLogger(VolumeDeleter.class); private LogicalStorageManager blockManager; public VolumeDeleter(LogicalStorageManager blockManager) { this.name = VolumeDeleter.class.getSimpleName(); this.runInterval = 30; // runs every 30 seconds, TODO make this configurable? this.blockManager = blockManager; } @Override public void run() { try { // Look for volumes marked for deletion and delete them VolumeInfo searchVolume = new VolumeInfo(); searchVolume.setStatus(StorageProperties.Status.deleting.toString()); List<VolumeInfo> volumesToBeDeleted = null; try { volumesToBeDeleted = Transactions.findAll(searchVolume); } catch (Exception e) { LOG.error("Failed to lookup volumes marked for deletion", e); return; } if (volumesToBeDeleted != null && !volumesToBeDeleted.isEmpty()) { for (VolumeInfo vol : volumesToBeDeleted) { // Do separate transaction for each volume so we don't // keep the transaction open for a long time try (TransactionResource tran = Entities.transactionFor(VolumeInfo.class)) { vol = Entities.uniqueResult(vol); final String volumeId = vol.getVolumeId(); LOG.info("Volume: " + volumeId + " marked for deletion. Checking export status"); if (Iterables.any(vol.getAttachmentTokens(), new Predicate<VolumeToken>() { @Override public boolean apply(VolumeToken token) { // Return true if attachment is valid or export exists. try { return token.hasActiveExports(); } catch (EucalyptusCloudException e) { LOG.warn("Failure checking for active exports for volume " + volumeId); return false; } } })) { // Exports exists... try un exporting the volume before deleting. LOG.info("Volume: " + volumeId + " found to be exported. Detaching volume from all hosts"); try { Entities.asTransaction(VolumeInfo.class, invalidateAndDetachAll(blockManager)) .apply(volumeId); } catch (Exception e) { LOG.error("Failed to fully detach volume " + volumeId, e); } } LOG.info("Volume: " + volumeId + " was marked for deletion. Cleaning up..."); try { blockManager.deleteVolume(volumeId); } catch (EucalyptusCloudException e) { LOG.debug("Failed to delete " + volumeId, e); LOG.warn("Unable to delete " + volumeId + ". Will retry later"); continue; } vol.setStatus(StorageProperties.Status.deleted.toString()); vol.setDeletionTime(new Date()); EucaSemaphoreDirectory.removeSemaphore(volumeId); // who put it there ? tran.commit(); } catch (Exception e) { LOG.error("Error deleting volume " + vol.getVolumeId() + ": " + e.getMessage()); LOG.debug("Exception during deleting volume " + vol.getVolumeId() + ".", e); } } } else { LOG.trace("No volumes marked for deletion"); } } catch (Exception e) { // could catch InterruptedException LOG.warn("Unable to remove volumes marked for deletion", e); return; } } private static Function<String, VolumeInfo> invalidateAndDetachAll(final LogicalStorageManager blockManager) { final Predicate<VolumeToken> invalidateExports = new Predicate<VolumeToken>() { @Override public boolean apply(VolumeToken volToken) { VolumeToken tokenEntity = Entities.merge(volToken); try { tokenEntity.invalidateAllExportsAndToken(); return true; } catch (Exception e) { LOG.error("Failed invalidating exports for token " + tokenEntity.getToken()); return false; } } }; // Could save cycles by statically setting all of these functions that don't require closures so they are not // constructed for each request. return new Function<String, VolumeInfo>() { @Override public VolumeInfo apply(String volumeId) { try { VolumeInfo volumeEntity = Entities.uniqueResult(new VolumeInfo(volumeId)); try { LOG.debug("Invalidating all tokens and all exports for " + volumeId); // Invalidate all tokens and exports and forcibly detach. if (!Iterables.all(volumeEntity.getAttachmentTokens(), invalidateExports)) { // At least one failed. LOG.error("Failed to invalidate all tokens and exports"); } } catch (Exception e) { LOG.error("Error invalidating tokens", e); } try { LOG.debug("Unexporting volume " + volumeId + " from all hosts"); blockManager.unexportVolumeFromAll(volumeId); } catch (EucalyptusCloudException ex) { LOG.error("Detaching volume " + volumeId + " from all hosts failed", ex); } } catch (NoSuchElementException e) { LOG.error("Cannot force detach of volume " + volumeId + " because it is not found in database"); return null; } catch (TransactionException e) { LOG.error("Failed to lookup volume " + volumeId); } return null; } }; } }