Examples with PostCheckpointAction herddb.core.PostCheckpointAction used on opensource projects

Example 16 with PostCheckpointAction

use of herddb.core.PostCheckpointAction in project herddb by diennea.

the class BookKeeperDataStorageManager method writeTransactionsAtCheckpoint.

@Override
public Collection<PostCheckpointAction> writeTransactionsAtCheckpoint(String tableSpace, LogSequenceNumber sequenceNumber, Collection<Transaction> transactions) throws DataStorageManagerException {
    if (sequenceNumber.isStartOfTime() && !transactions.isEmpty()) {
        throw new DataStorageManagerException("impossible to write a non empty transactions list at start-of-time");
    }
    String checkPointFile = getTablespaceTransactionsFile(tableSpace, sequenceNumber);
    LOGGER.log(Level.FINE, "writeTransactionsAtCheckpoint for tableSpace {0} sequenceNumber {1} to {2}, active transactions {3}", new Object[] { tableSpace, sequenceNumber, checkPointFile, transactions.size() });
    try (VisibleByteArrayOutputStream buffer = new VisibleByteArrayOutputStream();
        ExtendedDataOutputStream dout = new ExtendedDataOutputStream(buffer)) {
        // version
        dout.writeVLong(1);
        // flags for future implementations
        dout.writeVLong(0);
        dout.writeUTF(tableSpace);
        dout.writeZLong(sequenceNumber.ledgerId);
        dout.writeZLong(sequenceNumber.offset);
        dout.writeInt(transactions.size());
        for (Transaction t : transactions) {
            t.serialize(dout);
        }
        dout.flush();
        writeZNodeEnforceOwnership(tableSpace, checkPointFile, buffer.toByteArray(), null);
    } catch (IOException err) {
        throw new DataStorageManagerException(err);
    }
    Collection<PostCheckpointAction> result = new ArrayList<>();
    String tableSpaceDirectory = getTableSpaceZNode(tableSpace);
    List<String> stream = zkGetChildren(tableSpaceDirectory);
    for (String p : stream) {
        if (isTransactionsFile(p)) {
            try {
                byte[] content = readZNode(checkPointFile, new Stat());
                if (content != null) {
                    LogSequenceNumber logPositionInFile = readLogSequenceNumberFromTransactionsFile(tableSpace, content, p);
                    if (sequenceNumber.after(logPositionInFile)) {
                        LOGGER.log(Level.FINEST, "transactions metadata file " + p + ". will be deleted after checkpoint end");
                        result.add(new DeleteZNodeAction(tableSpace, "transactions", "delete transactions file " + p, p));
                    }
                }
            } catch (DataStorageManagerException ignore) {
                LOGGER.log(Level.SEVERE, "Unparsable transactions file " + p, ignore);
                result.add(new DeleteZNodeAction(tableSpace, "transactions", "delete unparsable transactions file " + p, p));
            }
        }
    }
    return result;
}