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Apache Jena Fuseki server Kafka connector

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.kafka.common.security.authenticator;

import java.util.concurrent.ConcurrentHashMap;

public class CredentialCache {

    private final ConcurrentHashMap> cacheMap = new ConcurrentHashMap<>();

    public  Cache createCache(String mechanism, Class credentialClass) {
        Cache cache = new Cache<>(credentialClass);
        @SuppressWarnings("unchecked")
        Cache oldCache = (Cache) cacheMap.putIfAbsent(mechanism, cache);
        return oldCache == null ? cache : oldCache;
    }

    @SuppressWarnings("unchecked")
    public  Cache cache(String mechanism, Class credentialClass) {
        Cache cache = cacheMap.get(mechanism);
        if (cache != null) {
            if (cache.credentialClass() != credentialClass)
                throw new IllegalArgumentException("Invalid credential class " + credentialClass + ", expected " + cache.credentialClass());
            return (Cache) cache;
        } else
            return null;
    }

    public static class Cache {
        private final Class credentialClass;
        private final ConcurrentHashMap credentials;

        public Cache(Class credentialClass) {
            this.credentialClass = credentialClass;
            this.credentials = new ConcurrentHashMap<>();
        }

        public C get(String username) {
            return credentials.get(username);
        }

        public C put(String username, C credential) {
            return credentials.put(username, credential);
        }

        public C remove(String username) {
            return credentials.remove(username);
        }

        public Class credentialClass() {
            return credentialClass;
        }
    }
}