Logging.java 文件源码

/**
 * Sets up audit logging to log to a file named based on the current time (in
 * ms).
 *
 * The logger is configured to effectively ignore the log level.
 *
 * @throws IOException
 *           if the audit log file could not be opened for writing.
 */
public static void configureAuditLogging() throws IOException {
  PatternLayout layout = new PatternLayout(AUDIT_LOG_FORMAT);
  // This assumes that no other daemon will be started within 1 millisecond.
  String filename = String.format(AUDIT_LOG_FILENAME_FORMAT,
      System.currentTimeMillis(), new Random().nextInt(Integer.MAX_VALUE));
  FileAppender fileAppender = new FileAppender(layout, filename);
  Logger auditLogger = Logger.getLogger(Logging.AUDIT_LOGGER_NAME);
  auditLogger.addAppender(fileAppender);
  auditLogger.setLevel(Level.ALL);
  /*
   * We don't want audit messages to be appended to the main appender, which
   * is intended for potentially user-facing messages.
   */
  auditLogger.setAdditivity(false);
}