@Override
public void deleteSnapshot(String snapName) throws DatabaseException {
try {
// check if the snapshot exists; if not, throw an exception
snapMan.getSnapshotDB(database.getName(), snapName);
// delete the snapshot
snapMan.deletePersistentSnapshot(database.getName(), snapName);
} catch (BabuDBException exc) {
throw new DatabaseException(exc);
}
}
@Override
public String[] getAllSnapshots() {
return snapMan.getAllSnapshots(volume.getId());
}
@Override
public void createSnapshot(String snapName, long parentId, String dirName, boolean recursive)
throws DatabaseException {
try {
// determine the prefixes for the snapshot
byte[][][] prefixes = null;
FileMetadata snapDir = getMetadata(parentId, dirName);
// for a full volume snapshot, simply use a 'null' prefix (full:
// dirID == 1 && recursive)
if (snapDir.getId() != 1 || !recursive) {
// get the IDs of all files and directories contained in the
// given directory; if recursive == true, include subdirectories
List<FileMetadata> nestedFiles = new LinkedList<FileMetadata>();
BabuDBStorageHelper.getNestedFiles(nestedFiles, database, snapDir.getId(), recursive);
List<byte[]> dirEntryPrefixes = new ArrayList<byte[]>(nestedFiles.size());
List<byte[]> filePrefixes = new ArrayList<byte[]>(nestedFiles.size());
// include the extended attributes of the volume's root
// directory if it's not the snapshot directory - they are
// needed to access volume-wide parameters in the snapshot, such
// as the access control policy
if (snapDir.getId() != 1) filePrefixes.add(ByteBuffer.wrap(new byte[8]).putLong(1).array());
// include all metadata of the snapshot (i.e. top level) dir
byte[] idxKey = BabuDBStorageHelper.createFileKey(parentId, dirName, (byte) -1);
byte[] fileKey = BabuDBStorageHelper.createFilePrefixKey(snapDir.getId());
dirEntryPrefixes.add(idxKey);
filePrefixes.add(fileKey);
// include the snapshot directory content
idxKey = BabuDBStorageHelper.createFilePrefixKey(snapDir.getId());
dirEntryPrefixes.add(idxKey);
// determine the key prefixes of all nested files to include and
// exclude
for (FileMetadata file : nestedFiles) {
// create a prefix key for the nested file
byte[] key = BabuDBStorageHelper.createFilePrefixKey(file.getId());
// if the nested file is a directory, ...
if (file.isDirectory()) {
// include the directory in the file prefixes
// and the directory prefix in the dir entry prefixes
filePrefixes.add(key);
dirEntryPrefixes.add(key);
}
// if the nested file is a file, ...
else filePrefixes.add(key);
}
byte[][] dirEntryPrefixesA = dirEntryPrefixes.toArray(new byte[dirEntryPrefixes.size()][]);
byte[][] filePrefixesA = filePrefixes.toArray(new byte[filePrefixes.size()][]);
Arrays.sort(dirEntryPrefixesA, DefaultByteRangeComparator.getInstance());
Arrays.sort(filePrefixesA, DefaultByteRangeComparator.getInstance());
// FILE_INDEX, XATTRS_INDEX, ACL_INDEX, FILE_ID_INDEX,
// VOLUME_INDEX
prefixes =
new byte[][][] {dirEntryPrefixesA, filePrefixesA, filePrefixesA, filePrefixesA, null};
}
// create the snapshot
SnapshotConfig snap = new DefaultSnapshotConfig(snapName, ALL_INDICES, prefixes, null);
snapMan.createPersistentSnapshot(database.getName(), snap);
} catch (BabuDBException exc) {
throw new DatabaseException(exc);
}
}