/** {@inheritDoc} */
 @Override
 public Collection<String> getEnabledSSLProtocols() {
   final SSLEngine engine = sslEngine;
   if (engine != null) {
     return Arrays.asList(engine.getEnabledProtocols());
   }
   return super.getEnabledSSLProtocols();
 }
  /**
   * This method will attempt to checksum the current JE db environment by computing the Adler-32
   * checksum on the latest JE log file available.
   *
   * @return The checksum of JE db environment or zero if checksum failed.
   */
  private long checksumDbEnv() {

    File parentDirectory = getFileForPath(cfg.getDBDirectory());
    File backendDirectory = new File(parentDirectory, cfg.getBackendId());

    List<File> jdbFiles = new ArrayList<File>();
    if (backendDirectory.isDirectory()) {
      jdbFiles =
          Arrays.asList(
              backendDirectory.listFiles(
                  new FilenameFilter() {
                    public boolean accept(File dir, String name) {
                      return name.endsWith(".jdb");
                    }
                  }));
    }

    if (!jdbFiles.isEmpty()) {
      Collections.sort(jdbFiles, Collections.reverseOrder());
      FileInputStream fis = null;
      try {
        fis = new FileInputStream(jdbFiles.get(0).toString());
        CheckedInputStream cis = new CheckedInputStream(fis, new Adler32());
        byte[] tempBuf = new byte[8192];
        while (cis.read(tempBuf) >= 0) {}

        return cis.getChecksum().getValue();
      } catch (Exception e) {
        if (debugEnabled()) {
          TRACER.debugCaught(DebugLogLevel.ERROR, e);
        }
      } finally {
        if (fis != null) {
          try {
            fis.close();
          } catch (Exception e) {
            if (debugEnabled()) {
              TRACER.debugCaught(DebugLogLevel.ERROR, e);
            }
          }
        }
      }
    }

    return 0;
  }