private void openHeadLogFile() throws ChangelogException {
final LogFile<K, V> head =
LogFile.newAppendableLogFile(new File(logPath, HEAD_LOG_FILE_NAME), recordParser);
final Record<K, V> newestRecord = head.getNewestRecord();
lastAppendedKey = newestRecord != null ? newestRecord.getKey() : null;
logFiles.put(recordParser.getMaxKey(), head);
}
/** Update the cursors that were pointing to head after a rotation of the head log file. */
private void updateOpenedCursorsOnHeadAfterRotation(
List<Pair<AbortableLogCursor<K, V>, CursorState<K, V>>> cursors) throws ChangelogException {
for (Pair<AbortableLogCursor<K, V>, CursorState<K, V>> pair : cursors) {
final CursorState<K, V> cursorState = pair.getSecond();
// Need to update the cursor only if it is pointing to the head log file
if (cursorState.isValid() && isHeadLogFile(cursorState.logFile)) {
final K previousKey = logFiles.lowerKey(recordParser.getMaxKey());
final LogFile<K, V> logFile = findLogFileFor(previousKey);
final AbortableLogCursor<K, V> cursor = pair.getFirst();
cursor.reinitializeTo(
new CursorState<K, V>(logFile, cursorState.filePosition, cursorState.record));
}
}
}
