Introduce org.argeo.maintenance

[lgpl/argeo-commons.git] / org.argeo.maintenance / src / org / argeo / maintenance / backup / vfs / SimpleBackupPurge.java

diff --git a/org.argeo.maintenance/src/org/argeo/maintenance/backup/vfs/SimpleBackupPurge.java b/org.argeo.maintenance/src/org/argeo/maintenance/backup/vfs/SimpleBackupPurge.java
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+/*
+ * Copyright (C) 2007-2012 Argeo GmbH
+ *
+ * Licensed 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 org.argeo.maintenance.backup.vfs;
+
+import java.text.DateFormat;
+import java.time.Period;
+import java.time.ZoneId;
+import java.time.ZonedDateTime;
+import java.util.Date;
+import java.util.SortedMap;
+import java.util.TreeMap;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.apache.commons.vfs2.FileObject;
+import org.apache.commons.vfs2.FileSystemManager;
+import org.apache.commons.vfs2.FileSystemOptions;
+import org.apache.commons.vfs2.Selectors;
+import org.argeo.maintenance.MaintenanceException;
+
+/** Simple backup purge which keeps backups only for a given number of days */
+public class SimpleBackupPurge implements BackupPurge {
+       private final static Log log = LogFactory.getLog(SimpleBackupPurge.class);
+
+       private Integer daysKept = 30;
+
+       @Override
+       public void purge(FileSystemManager fileSystemManager, String base, String name, DateFormat dateFormat,
+                       FileSystemOptions opts) {
+               try {
+                       ZonedDateTime nowDt = ZonedDateTime.now();
+                       FileObject baseFo = fileSystemManager.resolveFile(base + '/' + name, opts);
+
+                       SortedMap<ZonedDateTime, FileObject> toDelete = new TreeMap<ZonedDateTime, FileObject>();
+                       int backupCount = 0;
+
+                       // make sure base dir exists
+                       baseFo.createFolder();
+
+                       // scan backups and list those which should be deleted
+                       for (FileObject backupFo : baseFo.getChildren()) {
+                               String backupName = backupFo.getName().getBaseName();
+                               Date backupDate = dateFormat.parse(backupName);
+                               backupCount++;
+                               ZonedDateTime backupDt = ZonedDateTime.ofInstant(backupDate.toInstant(), ZoneId.systemDefault());
+                               Period sinceThen = Period.between(backupDt.toLocalDate(), nowDt.toLocalDate());
+                               // new Period(backupDt, nowDt);
+                               int days = sinceThen.getDays();
+                               // int days = sinceThen.getMinutes();
+                               if (days > daysKept) {
+                                       toDelete.put(backupDt, backupFo);
+                               }
+                       }
+
+                       if (toDelete.size() != 0 && toDelete.size() == backupCount) {
+                               // all backups would be deleted
+                               // but we want to keep at least one
+                               ZonedDateTime lastBackupDt = toDelete.firstKey();
+                               FileObject keptFo = toDelete.remove(lastBackupDt);
+                               log.warn("Backup " + keptFo + " kept although it is older than " + daysKept + " days.");
+                       }
+
+                       // delete old backups
+                       for (FileObject backupFo : toDelete.values()) {
+                               backupFo.delete(Selectors.SELECT_ALL);
+                               if (log.isDebugEnabled())
+                                       log.debug("Deleted backup " + backupFo);
+                       }
+               } catch (Exception e) {
+                       throw new MaintenanceException("Could not purge previous backups", e);
+               }
+
+       }
+
+}