@Override
    public String get(final String token) {
        return lock.tryLock(() -> {
            LOGGER.debug("Fetching ACME token [{}]...", token);
            return cache.getIfPresent(token);
        });
    }
This is {@link DefaultAcmeChallengeRepository}.

@author Misagh Moayyed
@since 6.4.0
@deprecated since 7.3.0
support/cas-server-support-acme/src/main/java/org/apereo/cas/acme/DefaultAcmeChallengeRepository.java