kafka CredentialCache 源码
kafka CredentialCache 代码
文件路径：/clients/src/main/java/org/apache/kafka/common/security/authenticator/CredentialCache.java
/*
* 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<String, Cache<? extends Object>> cacheMap = new ConcurrentHashMap<>();
public <C> Cache<C> createCache(String mechanism, Class<C> credentialClass) {
Cache<C> cache = new Cache<>(credentialClass);
@SuppressWarnings("unchecked")
Cache<C> oldCache = (Cache<C>) cacheMap.putIfAbsent(mechanism, cache);
return oldCache == null ? cache : oldCache;
}
@SuppressWarnings("unchecked")
public <C> Cache<C> cache(String mechanism, Class<C> 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<C>) cache;
} else
return null;
}
public static class Cache<C> {
private final Class<C> credentialClass;
private final ConcurrentHashMap<String, C> credentials;
public Cache(Class<C> 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<C> credentialClass() {
return credentialClass;
}
}
}
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