| /* |
| * 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.iotdb.tsfile.read.controller; |
| |
| import org.apache.iotdb.tsfile.common.cache.LRUCache; |
| import org.apache.iotdb.tsfile.file.metadata.ChunkMetadata; |
| import org.apache.iotdb.tsfile.file.metadata.IChunkMetadata; |
| import org.apache.iotdb.tsfile.file.metadata.statistics.Statistics; |
| import org.apache.iotdb.tsfile.read.TsFileSequenceReader; |
| import org.apache.iotdb.tsfile.read.common.Chunk; |
| import org.apache.iotdb.tsfile.read.common.TimeRange; |
| import org.apache.iotdb.tsfile.read.filter.basic.Filter; |
| import org.apache.iotdb.tsfile.read.reader.IChunkReader; |
| import org.apache.iotdb.tsfile.read.reader.chunk.ChunkReader; |
| |
| import java.io.IOException; |
| import java.io.Serializable; |
| import java.util.List; |
| import java.util.Objects; |
| |
| /** Read one Chunk and cache it into a LRUCache, only used in tsfile module. */ |
| public class CachedChunkLoaderImpl implements IChunkLoader { |
| |
| private static final int DEFAULT_CHUNK_CACHE_SIZE = 1000; |
| private TsFileSequenceReader reader; |
| private LRUCache<ChunkCacheKey, Chunk> chunkCache; |
| |
| public CachedChunkLoaderImpl(TsFileSequenceReader fileSequenceReader) { |
| this(fileSequenceReader, DEFAULT_CHUNK_CACHE_SIZE); |
| } |
| |
| /** |
| * constructor of ChunkLoaderImpl. |
| * |
| * @param fileSequenceReader file sequence reader |
| * @param cacheSize cache size |
| */ |
| public CachedChunkLoaderImpl(TsFileSequenceReader fileSequenceReader, int cacheSize) { |
| |
| this.reader = fileSequenceReader; |
| |
| chunkCache = |
| new LRUCache<ChunkCacheKey, Chunk>(cacheSize) { |
| |
| @Override |
| protected Chunk loadObjectByKey(ChunkCacheKey chunkCacheKey) throws IOException { |
| return reader.readMemChunk(chunkCacheKey); |
| } |
| }; |
| } |
| |
| @Override |
| public Chunk loadChunk(ChunkMetadata chunkMetaData) throws IOException { |
| Chunk chunk = chunkCache.get(new ChunkCacheKey(chunkMetaData)); |
| return new Chunk( |
| chunk.getHeader(), |
| chunk.getData().duplicate(), |
| chunkMetaData.getDeleteIntervalList(), |
| chunkMetaData.getStatistics()); |
| } |
| |
| @Override |
| public void close() throws IOException { |
| reader.close(); |
| } |
| |
| @Override |
| public IChunkReader getChunkReader(IChunkMetadata chunkMetaData, Filter globalTimeFilter) |
| throws IOException { |
| Chunk chunk = chunkCache.get(new ChunkCacheKey((ChunkMetadata) chunkMetaData)); |
| return new ChunkReader( |
| new Chunk( |
| chunk.getHeader(), |
| chunk.getData().duplicate(), |
| chunkMetaData.getDeleteIntervalList(), |
| chunkMetaData.getStatistics()), |
| globalTimeFilter); |
| } |
| |
| public static class ChunkCacheKey { |
| |
| private final Long offsetOfChunkHeader; |
| private final String measurementUid; |
| private final List<TimeRange> deleteIntervalList; |
| private final Statistics<? extends Serializable> statistics; |
| |
| public ChunkCacheKey(ChunkMetadata chunkMetadata) { |
| offsetOfChunkHeader = chunkMetadata.getOffsetOfChunkHeader(); |
| measurementUid = chunkMetadata.getMeasurementUid(); |
| deleteIntervalList = chunkMetadata.getDeleteIntervalList(); |
| statistics = chunkMetadata.getStatistics(); |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| if (this == o) { |
| return true; |
| } |
| if (o == null || getClass() != o.getClass()) { |
| return false; |
| } |
| ChunkCacheKey that = (ChunkCacheKey) o; |
| return Objects.equals(offsetOfChunkHeader, that.offsetOfChunkHeader); |
| } |
| |
| @Override |
| public int hashCode() { |
| return Objects.hash(offsetOfChunkHeader); |
| } |
| |
| public Long getOffsetOfChunkHeader() { |
| return offsetOfChunkHeader; |
| } |
| |
| public String getMeasurementUid() { |
| return measurementUid; |
| } |
| |
| public List<TimeRange> getDeleteIntervalList() { |
| return deleteIntervalList; |
| } |
| |
| public Statistics<? extends Serializable> getStatistics() { |
| return statistics; |
| } |
| } |
| } |