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   * Licensed to the Apache Software Foundation (ASF) under one
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   * 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,
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   * See the License for the specific language governing permissions and
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  package org.apache.cassandra.cache;
  
  import org.junit.Assert;
  import org.junit.Assume;
  import org.junit.BeforeClass;
  import org.junit.Test;
  
  import org.apache.cassandra.SchemaLoader;
  import org.apache.cassandra.Util;
  import org.apache.cassandra.config.DatabaseDescriptor;
  import org.apache.cassandra.db.ColumnFamilyStore;
  import org.apache.cassandra.db.Keyspace;
  import org.apache.cassandra.db.RowUpdateBuilder;
  import org.apache.cassandra.db.marshal.AsciiType;
  import org.apache.cassandra.exceptions.ConfigurationException;
  import org.apache.cassandra.io.sstable.AbstractRowIndexEntry;
  import org.apache.cassandra.io.sstable.format.SSTableReader;
  import org.apache.cassandra.io.sstable.keycache.KeyCacheSupport;
  import org.apache.cassandra.schema.ColumnMetadata;
  import org.apache.cassandra.schema.KeyspaceParams;
  import org.apache.cassandra.schema.TableMetadata;
  import org.apache.cassandra.service.CacheService;
  import org.apache.cassandra.utils.ByteBufferUtil;
  
  import static org.apache.cassandra.utils.Clock.Global.currentTimeMillis;
  
  public class AutoSavingCacheTest
  {
      private static final String KEYSPACE1 = "AutoSavingCacheTest1";
      private static final String CF_STANDARD1 = "Standard1";
  
      @BeforeClass
      public static void defineSchema() throws ConfigurationException
      {
          DatabaseDescriptor.daemonInitialization();
          Assume.assumeTrue(KeyCacheSupport.isSupportedBy(DatabaseDescriptor.getSelectedSSTableFormat()));
          SchemaLoader.prepareServer();
          SchemaLoader.createKeyspace(KEYSPACE1,
                                      KeyspaceParams.simple(1),
                                      TableMetadata.builder(KEYSPACE1, CF_STANDARD1)
                                                   .addPartitionKeyColumn("pKey", AsciiType.instance)
                                                   .addRegularColumn("col1", AsciiType.instance));
      }
  
      @Test
      public void testSerializeAndLoadKeyCache0kB() throws Exception
      {
          DatabaseDescriptor.setColumnIndexCacheSize(0);
          doTestSerializeAndLoadKeyCache();
      }
  
      @Test
      public void testSerializeAndLoadKeyCache() throws Exception
      {
          DatabaseDescriptor.setColumnIndexCacheSize(8);
          doTestSerializeAndLoadKeyCache();
      }
  
      private static void doTestSerializeAndLoadKeyCache() throws Exception
      {
          ColumnFamilyStore cfs = Keyspace.open(KEYSPACE1).getColumnFamilyStore(CF_STANDARD1);
          cfs.truncateBlocking();
          for (int i = 0; i < 2; i++)
          {
              ColumnMetadata colDef = ColumnMetadata.regularColumn(cfs.metadata(), ByteBufferUtil.bytes("col1"), AsciiType.instance, ColumnMetadata.NO_UNIQUE_ID);
              RowUpdateBuilder rowBuilder = new RowUpdateBuilder(cfs.metadata(), currentTimeMillis(), "key1");
              rowBuilder.add(colDef, "val1");
              rowBuilder.build().apply();
              Util.flush(cfs);
          }
  
          Assert.assertEquals(2, cfs.getLiveSSTables().size());
  
          // preheat key cache
          for (SSTableReader sstable : cfs.getLiveSSTables())
              sstable.getPosition(Util.dk("key1"), SSTableReader.Operator.EQ);
  
          AutoSavingCache<KeyCacheKey, AbstractRowIndexEntry> keyCache = CacheService.instance.keyCache;
  
          // serialize to file
          keyCache.submitWrite(keyCache.size()).get();
          keyCache.clear();
  
          Assert.assertEquals(0, keyCache.size());
  
          // then load saved
          keyCache.loadSavedAsync().get();
          for (SSTableReader sstable : cfs.getLiveSSTables())
              Assert.assertNotNull(keyCache.get(new KeyCacheKey(cfs.metadata(), sstable.descriptor, ByteBufferUtil.bytes("key1"))));
      }
  }
  