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.bifromq.retain.store;
  
  import org.apache.bifromq.basekv.store.api.IKVReader;
  import java.util.Map;
  import java.util.concurrent.ConcurrentHashMap;
  
  class TenantsState {
      private final Map<String, TenantRetainedSet> retainedSet = new ConcurrentHashMap<>();
      private final IKVReader reader;
      private final String[] tags;
  
      TenantsState(IKVReader reader, String... tags) {
          this.reader = reader;
          this.tags = tags;
      }
  
      void increaseTopicCount(String tenantId, int delta) {
          retainedSet.compute(tenantId, (k, v) -> {
              if (v == null) {
                  v = new TenantRetainedSet(tenantId, reader, tags);
              }
              if (v.incrementTopicCount(delta) == 0) {
                  v.destroy();
                  return null;
              }
              return v;
          });
      }
  
      void destroy() {
          retainedSet.values().forEach(TenantRetainedSet::destroy);
          retainedSet.clear();
      }
  }
  