--- /dev/null
+package org.argeo.slc.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.vfs2.FileObject;
+import org.apache.commons.vfs2.FileSystemManager;
+import org.apache.commons.vfs2.FileSystemOptions;
+import org.apache.commons.vfs2.Selectors;
+import org.argeo.api.cms.CmsLog;
+
+/** Simple backup purge which keeps backups only for a given number of days */
+public class SimpleBackupPurge implements BackupPurge {
+ private final static CmsLog log = CmsLog.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);
+ }
+
+ }
+
+}