org.argeo.maintenance/src/org/argeo/maintenance/backup/vfs/SimpleBackupPurge.java

   1 /*
   2  * Copyright (C) 2007-2012 Argeo GmbH
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *         http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 package org.argeo.maintenance.backup.vfs;
  17
  18 import java.text.DateFormat;
  19 import java.time.Period;
  20 import java.time.ZoneId;
  21 import java.time.ZonedDateTime;
  22 import java.util.Date;
  23 import java.util.SortedMap;
  24 import java.util.TreeMap;
  25
  26 import org.apache.commons.logging.Log;
  27 import org.apache.commons.logging.LogFactory;
  28 import org.apache.commons.vfs2.FileObject;
  29 import org.apache.commons.vfs2.FileSystemManager;
  30 import org.apache.commons.vfs2.FileSystemOptions;
  31 import org.apache.commons.vfs2.Selectors;
  32 import org.argeo.maintenance.MaintenanceException;
  33
  34 /** Simple backup purge which keeps backups only for a given number of days */
  35 public class SimpleBackupPurge implements BackupPurge {
  36         private final static Log log = LogFactory.getLog(SimpleBackupPurge.class);
  37
  38         private Integer daysKept = 30;
  39
  40         @Override
  41         public void purge(FileSystemManager fileSystemManager, String base, String name, DateFormat dateFormat,
  42                         FileSystemOptions opts) {
  43                 try {
  44                         ZonedDateTime nowDt = ZonedDateTime.now();
  45                         FileObject baseFo = fileSystemManager.resolveFile(base + '/' + name, opts);
  46
  47                         SortedMap<ZonedDateTime, FileObject> toDelete = new TreeMap<ZonedDateTime, FileObject>();
  48                         int backupCount = 0;
  49
  50                         // make sure base dir exists
  51                         baseFo.createFolder();
  52
  53                         // scan backups and list those which should be deleted
  54                         for (FileObject backupFo : baseFo.getChildren()) {
  55                                 String backupName = backupFo.getName().getBaseName();
  56                                 Date backupDate = dateFormat.parse(backupName);
  57                                 backupCount++;
  58                                 ZonedDateTime backupDt = ZonedDateTime.ofInstant(backupDate.toInstant(), ZoneId.systemDefault());
  59                                 Period sinceThen = Period.between(backupDt.toLocalDate(), nowDt.toLocalDate());
  60                                 // new Period(backupDt, nowDt);
  61                                 int days = sinceThen.getDays();
  62                                 // int days = sinceThen.getMinutes();
  63                                 if (days > daysKept) {
  64                                         toDelete.put(backupDt, backupFo);
  65                                 }
  66                         }
  67
  68                         if (toDelete.size() != 0 && toDelete.size() == backupCount) {
  69                                 // all backups would be deleted
  70                                 // but we want to keep at least one
  71                                 ZonedDateTime lastBackupDt = toDelete.firstKey();
  72                                 FileObject keptFo = toDelete.remove(lastBackupDt);
  73                                 log.warn("Backup " + keptFo + " kept although it is older than " + daysKept + " days.");
  74                         }
  75
  76                         // delete old backups
  77                         for (FileObject backupFo : toDelete.values()) {
  78                                 backupFo.delete(Selectors.SELECT_ALL);
  79                                 if (log.isDebugEnabled())
  80                                         log.debug("Deleted backup " + backupFo);
  81                         }
  82                 } catch (Exception e) {
  83                         throw new MaintenanceException("Could not purge previous backups", e);
  84                 }
  85
  86         }
  87
  88 }