Working backups

[lgpl/argeo-commons.git] / server / runtime / org.argeo.server.core / src / main / java / org / argeo / server / backup / SimpleBackupPurge.java

diff --git a/server/runtime/org.argeo.server.core/src/main/java/org/argeo/server/backup/SimpleBackupPurge.java b/server/runtime/org.argeo.server.core/src/main/java/org/argeo/server/backup/SimpleBackupPurge.java
new file mode 100644 (file)
index 0000000..47a04cf
--- /dev/null
+++ b/server/runtime/org.argeo.server.core/src/main/java/org/argeo/server/backup/SimpleBackupPurge.java
@@ -0,0 +1,72 @@
+package org.argeo.server.backup;
+
+import java.text.DateFormat;
+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.vfs.FileObject;
+import org.apache.commons.vfs.FileSystemManager;
+import org.apache.commons.vfs.FileSystemOptions;
+import org.apache.commons.vfs.Selectors;
+import org.argeo.ArgeoException;
+import org.joda.time.DateTime;
+import org.joda.time.Period;
+
+/** 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 = 5;
+
+       @Override
+       public void purge(FileSystemManager fileSystemManager, String base,
+                       String name, DateFormat dateFormat, FileSystemOptions opts) {
+               try {
+                       DateTime nowDt = new DateTime();
+                       FileObject baseFo = fileSystemManager.resolveFile(
+                                       base + '/' + name, opts);
+
+                       SortedMap<DateTime, FileObject> toDelete = new TreeMap<DateTime, FileObject>();
+                       int backupCount = 0;
+
+                       // scan backups an list those which should be deleted
+                       for (FileObject backupFo : baseFo.getChildren()) {
+                               String backupName = backupFo.getName().getBaseName();
+                               Date backupDate = dateFormat.parse(backupName);
+                               backupCount++;
+
+                               DateTime backupDt = new DateTime(backupDate.getTime());
+                               Period sinceThen = 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
+                               DateTime 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 ArgeoException("Could not purge previous backups", e);
+               }
+
+       }
+
+}