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);
}
/**
* Returns the file name to use for the read-only version of the provided log file.
*
* <p>The file name is based on the lowest and highest key in the log file.
*
* @return the name to use for the read-only version of the log file
* @throws ChangelogException If an error occurs.
*/
private String generateReadOnlyFileName(final LogFile<K, V> logFile) throws ChangelogException {
final K lowestKey = logFile.getOldestRecord().getKey();
final K highestKey = logFile.getNewestRecord().getKey();
return recordParser.encodeKeyToString(lowestKey)
+ LOG_FILE_NAME_SEPARATOR
+ recordParser.encodeKeyToString(highestKey)
+ LOG_FILE_SUFFIX;
}