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.cache;
  
  import java.io.IOException;
  
  import org.apache.cassandra.config.DatabaseDescriptor;
  import org.apache.cassandra.db.TypeSizes;
  import org.apache.cassandra.db.partitions.CachedPartition;
  import org.apache.cassandra.io.ISerializer;
  import org.apache.cassandra.io.util.DataInputPlus;
  import org.apache.cassandra.io.util.DataOutputPlus;
  
  public class SerializingCacheProvider implements CacheProvider<RowCacheKey, IRowCacheEntry>
  {
      public ICache<RowCacheKey, IRowCacheEntry> create()
      {
          return SerializingCache.create(DatabaseDescriptor.getRowCacheSizeInMiB() * 1024 * 1024, new RowCacheSerializer());
      }
  
      // Package Public: used by external Row Cache plugins
      public static class RowCacheSerializer implements ISerializer<IRowCacheEntry>
      {
          public void serialize(IRowCacheEntry entry, DataOutputPlus out) throws IOException
          {
              assert entry != null; // unlike CFS we don't support nulls, since there is no need for that in the cache
              boolean isSentinel = entry instanceof RowCacheSentinel;
              out.writeBoolean(isSentinel);
              if (isSentinel)
                  out.writeLong(((RowCacheSentinel) entry).sentinelId);
              else
                  CachedPartition.cacheSerializer.serialize((CachedPartition)entry, out);
          }
  
          public IRowCacheEntry deserialize(DataInputPlus in) throws IOException
          {
              boolean isSentinel = in.readBoolean();
              if (isSentinel)
                  return new RowCacheSentinel(in.readLong());
  
              return CachedPartition.cacheSerializer.deserialize(in);
          }
  
          public long serializedSize(IRowCacheEntry entry)
          {
              int size = TypeSizes.sizeof(true);
              if (entry instanceof RowCacheSentinel)
                  size += TypeSizes.sizeof(((RowCacheSentinel) entry).sentinelId);
              else
                  size += CachedPartition.cacheSerializer.serializedSize((CachedPartition) entry);
              return size;
          }
      }
  }
  