content: /*
   * 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.streams.processor.internals;
  
  import org.apache.kafka.common.config.TopicConfig;
  
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.Map;
  import java.util.Objects;
  
  /**
   * VersionedChangelogTopicConfig captures the properties required for configuring
   * the versioned store changelog topics.
   */
  public class VersionedChangelogTopicConfig extends InternalTopicConfig {
      private static final Map<String, String> VERSIONED_STORE_CHANGELOG_TOPIC_DEFAULT_OVERRIDES;
      static {
          final Map<String, String> tempTopicDefaultOverrides = new HashMap<>(INTERNAL_TOPIC_DEFAULT_OVERRIDES);
          tempTopicDefaultOverrides.put(TopicConfig.CLEANUP_POLICY_CONFIG, TopicConfig.CLEANUP_POLICY_COMPACT);
          VERSIONED_STORE_CHANGELOG_TOPIC_DEFAULT_OVERRIDES = Collections.unmodifiableMap(tempTopicDefaultOverrides);
      }
      private static final long VERSIONED_STORE_CHANGE_LOG_ADDITIONAL_COMPACTION_LAG_MS = 24 * 60 * 60 * 1000L;
  
      private final long minCompactionLagMs;
  
      VersionedChangelogTopicConfig(final String name,
                                    final Map<String, String> topicConfigs,
                                    final long minCompactionLagMs) {
          super(name, topicConfigs);
          this.minCompactionLagMs = minCompactionLagMs;
      }
  
      /**
       * Get the configured properties for this topic. If no {@code minCompactionLagMs} is
       * provided from the topic configs, then we add
       * {@code VERSIONED_STORE_CHANGE_LOG_ADDITIONAL_COMPACTION_LAG_MS} to work out the
       * desired min compaction lag for cleanup.policy=compact
       *
       * @param windowStoreAdditionalRetentionMs added to retention for window store changelog
       *                                         topics to allow for clock drift etc. We do not reuse
       *                                         this value for versioned store changelog topic
       *                                         compaction lag as the user-facing config name is
       *                                         window store specific.
       * @return Properties to be used when creating the topic
       */
      @Override
      public Map<String, String> properties(final Map<String, String> defaultProperties, final long windowStoreAdditionalRetentionMs) {
          // internal topic config override rule: library overrides < global config overrides < per-topic config overrides
          final Map<String, String> topicConfig = new HashMap<>(VERSIONED_STORE_CHANGELOG_TOPIC_DEFAULT_OVERRIDES);
  
          topicConfig.putAll(defaultProperties);
  
          topicConfig.putAll(topicConfigs);
  
          if (!topicConfigs.containsKey(TopicConfig.MIN_COMPACTION_LAG_MS_CONFIG)) {
              long compactionLagValue;
              try {
                  compactionLagValue = Math.addExact(minCompactionLagMs, VERSIONED_STORE_CHANGE_LOG_ADDITIONAL_COMPACTION_LAG_MS);
              } catch (final ArithmeticException swallow) {
                  compactionLagValue = Long.MAX_VALUE;
              }
              topicConfig.put(TopicConfig.MIN_COMPACTION_LAG_MS_CONFIG, String.valueOf(compactionLagValue));
          }
  
          return topicConfig;
      }
  
      @Override
      public boolean equals(final Object o) {
          if (this == o) {
              return true;
          }
          if (o == null || getClass() != o.getClass()) {
              return false;
          }
          final VersionedChangelogTopicConfig that = (VersionedChangelogTopicConfig) o;
          return Objects.equals(name, that.name) &&
              Objects.equals(topicConfigs, that.topicConfigs) &&
              Objects.equals(minCompactionLagMs, that.minCompactionLagMs) &&
              Objects.equals(enforceNumberOfPartitions, that.enforceNumberOfPartitions);
      }
  
      @Override
      public int hashCode() {
          return Objects.hash(name, topicConfigs, minCompactionLagMs, enforceNumberOfPartitions);
      }
  
      @Override
      public String toString() {
          return "VersionedChangelogTopicConfig(" +
              "name=" + name +
              ", topicConfigs=" + topicConfigs +
              ", minCompactionLagMs=" + minCompactionLagMs +
              ", enforceNumberOfPartitions=" + enforceNumberOfPartitions +
              ")";
      }
  }