/**
* Log an update. Will flush to disk before returning.
*
* @param o Update argument
* @throws IllegalStateException if the current thread does not hold a non-exclusive mutator lock
* @throws IOException If errors accessing the file system occur
*/
public void update(Object o) throws IOException {
final Long lockStateVal = lockState.get();
if (lockStateVal == null || lockStateVal == 0)
throw new IllegalStateException(
"PersistentStrore.update:" + "Must acquire mutator lock before calling update()");
synchronized (this) {
log.update(o, true);
updateCount++;
snapshotHandler.updatePerformed(updateCount);
}
}
@Override
public <T> T snapshot(SnapshotHandler<T> snapshotHandler) throws EngineException {
SnapshotIndexCommit snapshotIndexCommit = null;
Translog.Snapshot traslogSnapshot = null;
rwl.readLock().lock();
try {
snapshotIndexCommit = deletionPolicy.snapshot();
traslogSnapshot = translog.snapshot();
} catch (Exception e) {
if (snapshotIndexCommit != null) snapshotIndexCommit.release();
throw new SnapshotFailedEngineException(shardId, e);
} finally {
rwl.readLock().unlock();
}
try {
return snapshotHandler.snapshot(snapshotIndexCommit, traslogSnapshot);
} finally {
snapshotIndexCommit.release();
traslogSnapshot.release();
}
}
