private String getPassword(Configuration configuration) {
    String rawPassword = configuration.getProperty(Configuration.SSL_TRUSTSTORE_PASSWORD.getKey());
    String password    = PasswordUtils.getInstance().readPasswordFromStore(rawPassword, configuration);

    return password == null ? rawPassword : password;
  }
Get the singleton instance.

@return the singleton instance
ambari-server/src/main/java/org/apache/ambari/server/configuration/ComponentSSLConfiguration.java