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.HashMap;
  import java.util.Map;
  import java.util.concurrent.atomic.AtomicBoolean;
  import java.util.function.BooleanSupplier;
  
  import com.google.common.util.concurrent.MoreExecutors;
  
  import com.github.benmanes.caffeine.cache.CacheLoader;
  import com.github.benmanes.caffeine.cache.Caffeine;
  import com.github.benmanes.caffeine.cache.LoadingCache;
  import org.junit.Assert;
  import org.junit.Test;
  
  public class CacheRefresherTest
  {
      @Test
      public void refresh() throws Exception
      {
          Map<String, String> src = new HashMap<>();
          CacheLoader<String, String> loader = src::get;
  
          // Supply the directExecutor so the refresh() call executes within the refresher task like AuthCache (rather than async)
          LoadingCache<String, String> cache = Caffeine.newBuilder()
                                                       .executor(MoreExecutors.directExecutor())
                                                       .build(loader);
  
          AtomicBoolean skipRefresh = new AtomicBoolean(false);
          BooleanSupplier skipCondition = skipRefresh::get;
  
          CacheRefresher<String, String> refresher = CacheRefresher.create("test", cache, (k, v) -> v.equals("removed"), skipCondition);
          src.put("some", "thing");
          Assert.assertEquals("thing", cache.get("some"));
  
          // Cache should still have old value...
          src.put("some", "one");
          Assert.assertEquals("thing", cache.get("some"));
  
          // ... but refresher should update it
          refresher.run();
          Assert.assertEquals("one", cache.get("some"));
  
          // If we just remove the value from the src, the cache should still contain it
          src.remove("some");
          Assert.assertEquals("one", cache.get("some"));
  
          // If we insert the special sentinel value into the src, the refresher will invalidate it from the cache.
          // This time when it's removed from the underlying storage, it's not returned from the cache
          src.put("some", "removed");
          refresher.run();
          src.remove("some");
  
          // Remove from src
          Assert.assertNull(cache.get("some"));
  
          // If the skip condition returns true, don't refresh
          src.put("some", "one");
          Assert.assertEquals("one", cache.get("some"));
          skipRefresh.set(true);
          src.put("some", "body");
          refresher.run();
          Assert.assertEquals("one", cache.get("some"));
  
          // Change the skip condition back to false and refresh
          skipRefresh.set(false);
          refresher.run();
          Assert.assertEquals("body", cache.get("some"));
      }
  }
  