/** Add a snapshot. */
Snapshot addSnapshot(int id, String name) throws SnapshotException, QuotaExceededException {
// check snapshot quota
final int n = getNumSnapshots();
if (n + 1 > snapshotQuota) {
throw new SnapshotException(
"Failed to add snapshot: there are already "
+ n
+ " snapshot(s) and the snapshot quota is "
+ snapshotQuota);
}
final Snapshot s = new Snapshot(id, name, this);
final byte[] nameBytes = s.getRoot().getLocalNameBytes();
final int i = searchSnapshot(nameBytes);
if (i >= 0) {
throw new SnapshotException(
"Failed to add snapshot: there is already a "
+ "snapshot with the same name \""
+ Snapshot.getSnapshotName(s)
+ "\".");
}
final DirectoryDiff d = getDiffs().addDiff(s, this);
d.snapshotINode = s.getRoot();
snapshotsByNames.add(-i - 1, s);
// set modification time
updateModificationTime(Time.now(), null, null);
s.getRoot().setModificationTime(getModificationTime(), null, null);
return s;
}
@Override
public void dumpTreeRecursively(PrintWriter out, StringBuilder prefix, Snapshot snapshot) {
super.dumpTreeRecursively(out, prefix, snapshot);
if (snapshot == null) {
out.println();
out.print(prefix);
out.print("Snapshot of ");
final String name = getLocalName();
out.print(name.isEmpty() ? "/" : name);
out.print(": quota=");
out.print(getSnapshotQuota());
int n = 0;
for (DirectoryDiff diff : getDiffs()) {
if (diff.isSnapshotRoot()) {
n++;
}
}
Preconditions.checkState(n == snapshotsByNames.size());
out.print(", #snapshot=");
out.println(n);
dumpTreeRecursively(
out,
prefix,
new Iterable<SnapshotAndINode>() {
@Override
public Iterator<SnapshotAndINode> iterator() {
return new Iterator<SnapshotAndINode>() {
final Iterator<DirectoryDiff> i = getDiffs().iterator();
private DirectoryDiff next = findNext();
private DirectoryDiff findNext() {
for (; i.hasNext(); ) {
final DirectoryDiff diff = i.next();
if (diff.isSnapshotRoot()) {
return diff;
}
}
return null;
}
@Override
public boolean hasNext() {
return next != null;
}
@Override
public SnapshotAndINode next() {
final Snapshot s = next.snapshot;
final SnapshotAndINode pair = new SnapshotAndINode(s);
next = findNext();
return pair;
}
@Override
public void remove() {
throw new UnsupportedOperationException();
}
};
}
});
}
}
