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.../java/org/apache/doris/common/security/authentication/PreExecutionAuthenticatorCache.java
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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. | ||
|
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| package org.apache.doris.common.security.authentication; | ||
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| import org.apache.hadoop.conf.Configuration; | ||
| import org.apache.logging.log4j.LogManager; | ||
| import org.apache.logging.log4j.Logger; | ||
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| import java.util.HashMap; | ||
| import java.util.LinkedHashMap; | ||
| import java.util.Map; | ||
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| /** | ||
| * A cache class for storing and retrieving PreExecutionAuthenticator instances based on Hadoop configurations. | ||
| * This class caches PreExecutionAuthenticator objects to avoid recreating them for the same Hadoop configuration. | ||
| * It uses a Least Recently Used (LRU) cache, where the least recently used entries are removed when the cache exceeds | ||
| * the maximum size (MAX_CACHE_SIZE). | ||
| * <p> | ||
| * The purpose of this class is to ensure that for identical Hadoop configurations (key-value pairs), | ||
| * only one PreExecutionAuthenticator instance is created and reused, optimizing performance by reducing | ||
| * redundant instantiations. | ||
| */ | ||
| public class PreExecutionAuthenticatorCache { | ||
| private static final Logger LOG = LogManager.getLogger(PreExecutionAuthenticatorCache.class); | ||
| private static final int MAX_CACHE_SIZE = 100; | ||
| private static final Map<HadoopConfigWrapper, PreExecutionAuthenticator> preExecutionAuthenticatorCache = | ||
| new LinkedHashMap<HadoopConfigWrapper, PreExecutionAuthenticator>(MAX_CACHE_SIZE, 0.75f, true) { | ||
| @Override | ||
| protected boolean removeEldestEntry(Map.Entry<HadoopConfigWrapper, PreExecutionAuthenticator> eldest) { | ||
| return size() > MAX_CACHE_SIZE; | ||
| } | ||
| }; | ||
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| /** | ||
| * Retrieves a PreExecutionAuthenticator instance from the cache or creates a new one if it doesn't exist. | ||
| * This method first checks if the configuration is already cached. If not, it computes a new instance and | ||
| * caches it for future use. | ||
| * | ||
| * @param hadoopConfig The Hadoop configuration (key-value pairs) | ||
| * @return A PreExecutionAuthenticator instance for the given configuration | ||
| */ | ||
| public static PreExecutionAuthenticator getAuthenticator(Map<String, String> hadoopConfig) { | ||
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| HadoopConfigWrapper hadoopConfigWrapper = new HadoopConfigWrapper(hadoopConfig); | ||
| PreExecutionAuthenticator cachedAuthenticator = preExecutionAuthenticatorCache.get(hadoopConfigWrapper); | ||
| if (cachedAuthenticator != null) { | ||
| return cachedAuthenticator; | ||
| } | ||
| return preExecutionAuthenticatorCache.computeIfAbsent(hadoopConfigWrapper, config -> { | ||
| Configuration conf = new Configuration(); | ||
| hadoopConfig.forEach(conf::set); | ||
| PreExecutionAuthenticator preExecutionAuthenticator = new PreExecutionAuthenticator(); | ||
| AuthenticationConfig authenticationConfig = AuthenticationConfig.getKerberosConfig(conf, | ||
| AuthenticationConfig.HADOOP_KERBEROS_PRINCIPAL, | ||
| AuthenticationConfig.HADOOP_KERBEROS_KEYTAB); | ||
| HadoopAuthenticator authenticator = HadoopAuthenticator.getHadoopAuthenticator(authenticationConfig); | ||
| preExecutionAuthenticator.setHadoopAuthenticator(authenticator); | ||
| LOG.info("Created new authenticator for configuration: " + hadoopConfigWrapper); | ||
| return preExecutionAuthenticator; | ||
| }); | ||
| } | ||
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| /** | ||
| * Hadoop configuration wrapper class that wraps a Map<String, String> configuration. | ||
| * This class overrides the equals() and hashCode() methods to enable comparison of | ||
| * the configurations in the cache, ensuring that identical configurations (with the same key-value pairs) | ||
| * are considered equal and can reuse the same cached PreExecutionAuthenticator instance. | ||
| * <p> | ||
| * The purpose of this class is to ensure that in the cache, if two configurations are identical | ||
| * (i.e., they have the same key-value pairs), only one instance of PreExecutionAuthenticator is created and cached. | ||
| * By implementing custom equals() and hashCode() methods, we ensure that even if different Map instances | ||
| * hold the same configuration data, they are considered equal in the cache. | ||
| */ | ||
| private static class HadoopConfigWrapper { | ||
| private final Map<String, String> config; | ||
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| /** | ||
| * Constructor that takes a Map<String, String> configuration. | ||
| * | ||
| * @param config The Hadoop configuration, typically a Map<String, String> containing configuration key-value | ||
| * pairs | ||
| */ | ||
| public HadoopConfigWrapper(Map<String, String> config) { | ||
| this.config = new HashMap<>(config); | ||
| } | ||
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| /** | ||
| * Checks if two HadoopConfigWrapper objects are equal. | ||
| * Two objects are considered equal if their wrapped Map configurations are identical | ||
| * (i.e., the key-value pairs are the same). | ||
| * | ||
| * @param obj The object to compare with the current object | ||
| * @return true if the two HadoopConfigWrapper objects have the same wrapped configuration; false otherwise | ||
| */ | ||
| @Override | ||
| public boolean equals(Object obj) { | ||
| if (this == obj) { | ||
| return true; | ||
| } | ||
| if (obj == null || getClass() != obj.getClass()) { | ||
| return false; | ||
| } | ||
| HadoopConfigWrapper that = (HadoopConfigWrapper) obj; | ||
| return config.equals(that.config); | ||
| } | ||
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| /** | ||
| * Generates a hash code based on the Hadoop configuration. | ||
| * Objects with the same configuration will generate the same hash code, ensuring | ||
| * that they can be correctly matched in a Map. | ||
| * | ||
| * @return The hash code of the Hadoop configuration | ||
| */ | ||
| @Override | ||
| public int hashCode() { | ||
| return config.hashCode(); | ||
| } | ||
| } | ||
| } |