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.cassandra.auth;
  
  import java.util.HashSet;
  import java.util.Set;
  import java.util.concurrent.atomic.AtomicBoolean;
  
  import javax.annotation.concurrent.ThreadSafe;
  
  import com.google.common.annotations.VisibleForTesting;
  import com.google.common.base.Preconditions;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  @ThreadSafe
  public class AuthCacheService
  {
      private static final Logger logger = LoggerFactory.getLogger(AuthCacheService.class);
      public static final AuthCacheService instance = new AuthCacheService();
  
      private final Set<AuthCache<?, ?>> caches = new HashSet<>();
      private static final AtomicBoolean cachesRegistered = new AtomicBoolean(false);
  
      public synchronized void register(AuthCache<?, ?> cache)
      {
          Preconditions.checkNotNull(cache);
          caches.add(cache);
      }
  
      public synchronized void unregister(AuthCache<?, ?> cache)
      {
          Preconditions.checkNotNull(cache);
          caches.remove(cache);
      }
  
      public synchronized void warmCaches()
      {
          logger.info("Initiating bulk load of {} auth cache(s)", caches.size());
          for (AuthCache<?, ?> cache : caches)
          {
              cache.warm();
          }
      }
  
      /**
       * NOTE: Can only be called once per instance run.
       *
       * We have a couple of static initializer functions to create caches scattered across various classes, some solo
       * and some with multiple member variables. As we expect these caches to be created and initialized in one logical
       * block, we tie them together and use them here.
       *
       * Note: We also register the PasswordAuthenticator cache with the {@link AuthCacheService} in it's constructor
       */
      @VisibleForTesting
      public static void initializeAndRegisterCaches()
      {
          if (!cachesRegistered.getAndSet(true))
          {
              AuthenticatedUser.init();
              Roles.init();
          }
      }
  
      /**
       * Invalidates all registered caches, which is useful for tests that make changes to roles, identities, cidr
       * permissions and so on.
       */
      @VisibleForTesting
      public synchronized void invalidateCaches()
      {
          logger.info("Bulk invalidating {} auth cache(s)", caches.size());
          for (AuthCache<?, ?> cache : caches)
          {
              cache.invalidate();
          }
      }
  }