public LogManager(TransactionSubsystem txnSubsystem) throws ACIDException {
this.txnSubsystem = txnSubsystem;
logManagerProperties =
new LogManagerProperties(
this.txnSubsystem.getTransactionProperties(), this.txnSubsystem.getId());
logFileSize = logManagerProperties.getLogPartitionSize();
logPageSize = logManagerProperties.getLogPageSize();
numLogPages = logManagerProperties.getNumLogPages();
logDir = logManagerProperties.getLogDir();
logFilePrefix = logManagerProperties.getLogFilePrefix();
flushLSN = new MutableLong();
appendLSN = new AtomicLong();
initializeLogManager(SMALLEST_LOG_FILE_ID);
}
private void dumpConfVars(OutputStream os) {
try {
StringBuilder sb = new StringBuilder();
sb.append("\n>>dump_begin\t>>----- [ConfVars] -----");
sb.append(logManagerProperties.toString());
sb.append("\n>>dump_end\t>>----- [ConfVars] -----\n");
os.write(sb.toString().getBytes());
} catch (Exception e) {
// ignore exception and continue dumping as much as possible.
if (IS_DEBUG_MODE) {
e.printStackTrace();
}
}
}
private long initializeLogAnchor(long nextLogFileId) {
long fileId = 0;
long offset = 0;
File fileLogDir = new File(logDir);
try {
if (fileLogDir.exists()) {
List<Long> logFileIds = getLogFileIds();
if (logFileIds == null) {
fileId = nextLogFileId;
createFileIfNotExists(getLogFilePath(fileId));
if (LOGGER.isLoggable(Level.INFO)) {
LOGGER.info("created a log file: " + getLogFilePath(fileId));
}
} else {
fileId = logFileIds.get(logFileIds.size() - 1);
File logFile = new File(getLogFilePath(fileId));
offset = logFile.length();
}
} else {
fileId = nextLogFileId;
createNewDirectory(logDir);
if (LOGGER.isLoggable(Level.INFO)) {
LOGGER.info("created the log directory: " + logManagerProperties.getLogDir());
}
createFileIfNotExists(getLogFilePath(fileId));
if (LOGGER.isLoggable(Level.INFO)) {
LOGGER.info("created a log file: " + getLogFilePath(fileId));
}
}
} catch (IOException ioe) {
throw new IllegalStateException("Failed to initialize the log anchor", ioe);
}
if (LOGGER.isLoggable(Level.INFO)) {
LOGGER.info("log file Id: " + fileId + ", offset: " + offset);
}
return logFileSize * fileId + offset;
}