| /* |
| * 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; |
| } |
| } |
| } |