| /* |
| * 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.reader.chunk; |
| |
| import org.apache.iotdb.tsfile.encoding.decoder.Decoder; |
| import org.apache.iotdb.tsfile.file.MetaMarker; |
| import org.apache.iotdb.tsfile.file.header.ChunkHeader; |
| import org.apache.iotdb.tsfile.file.header.PageHeader; |
| import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType; |
| import org.apache.iotdb.tsfile.file.metadata.statistics.Statistics; |
| 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.page.AlignedPageReader; |
| |
| import java.io.IOException; |
| import java.io.Serializable; |
| import java.nio.ByteBuffer; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| public class AlignedChunkReader extends AbstractChunkReader { |
| |
| // chunk header of the time column |
| private final ChunkHeader timeChunkHeader; |
| // chunk data of the time column |
| private final ByteBuffer timeChunkDataBuffer; |
| |
| // chunk headers of all the sub sensors |
| private final List<ChunkHeader> valueChunkHeaderList = new ArrayList<>(); |
| // chunk data of all the sub sensors |
| private final List<ByteBuffer> valueChunkDataBufferList = new ArrayList<>(); |
| // deleted intervals of all the sub sensors |
| private final List<List<TimeRange>> valueDeleteIntervalsList = new ArrayList<>(); |
| |
| @SuppressWarnings("unchecked") |
| public AlignedChunkReader( |
| Chunk timeChunk, List<Chunk> valueChunkList, long readStopTime, Filter queryFilter) |
| throws IOException { |
| super(readStopTime, queryFilter); |
| this.timeChunkHeader = timeChunk.getHeader(); |
| this.timeChunkDataBuffer = timeChunk.getData(); |
| |
| List<Statistics<? extends Serializable>> valueChunkStatisticsList = new ArrayList<>(); |
| valueChunkList.forEach( |
| chunk -> { |
| this.valueChunkHeaderList.add(chunk == null ? null : chunk.getHeader()); |
| this.valueChunkDataBufferList.add(chunk == null ? null : chunk.getData()); |
| this.valueDeleteIntervalsList.add(chunk == null ? null : chunk.getDeleteIntervalList()); |
| |
| valueChunkStatisticsList.add(chunk == null ? null : chunk.getChunkStatistic()); |
| }); |
| |
| initAllPageReaders(timeChunk.getChunkStatistic(), valueChunkStatisticsList); |
| } |
| |
| public AlignedChunkReader(Chunk timeChunk, List<Chunk> valueChunkList) throws IOException { |
| this(timeChunk, valueChunkList, Long.MIN_VALUE, null); |
| } |
| |
| public AlignedChunkReader(Chunk timeChunk, List<Chunk> valueChunkList, Filter queryFilter) |
| throws IOException { |
| this(timeChunk, valueChunkList, Long.MIN_VALUE, queryFilter); |
| } |
| |
| /** |
| * Constructor of ChunkReader by timestamp. This constructor is used to accelerate queries by |
| * filtering out pages whose endTime is less than current timestamp. |
| */ |
| public AlignedChunkReader(Chunk timeChunk, List<Chunk> valueChunkList, long readStopTime) |
| throws IOException { |
| this(timeChunk, valueChunkList, readStopTime, null); |
| } |
| |
| /** construct all the page readers in this chunk */ |
| private void initAllPageReaders( |
| Statistics<? extends Serializable> timeChunkStatistics, |
| List<Statistics<? extends Serializable>> valueChunkStatisticsList) |
| throws IOException { |
| // construct next satisfied page header |
| while (timeChunkDataBuffer.remaining() > 0) { |
| // deserialize PageHeader from chunkDataBuffer |
| AlignedPageReader alignedPageReader = |
| isSinglePageChunk() |
| ? deserializeFromSinglePageChunk(timeChunkStatistics, valueChunkStatisticsList) |
| : deserializeFromMultiPageChunk(); |
| if (alignedPageReader != null) { |
| pageReaderList.add(alignedPageReader); |
| } |
| } |
| } |
| |
| private boolean isSinglePageChunk() { |
| return (timeChunkHeader.getChunkType() & 0x3F) == MetaMarker.ONLY_ONE_PAGE_CHUNK_HEADER; |
| } |
| |
| private AlignedPageReader deserializeFromSinglePageChunk( |
| Statistics<? extends Serializable> timeChunkStatistics, |
| List<Statistics<? extends Serializable>> valueChunkStatisticsList) |
| throws IOException { |
| PageHeader timePageHeader = |
| PageHeader.deserializeFrom(timeChunkDataBuffer, timeChunkStatistics); |
| List<PageHeader> valuePageHeaderList = new ArrayList<>(); |
| |
| boolean isAllNull = true; |
| for (int i = 0; i < valueChunkDataBufferList.size(); i++) { |
| if (valueChunkDataBufferList.get(i) != null) { |
| isAllNull = false; |
| valuePageHeaderList.add( |
| PageHeader.deserializeFrom( |
| valueChunkDataBufferList.get(i), valueChunkStatisticsList.get(i))); |
| } else { |
| valuePageHeaderList.add(null); |
| } |
| } |
| |
| if (isAllNull || timePageHeader.getEndTime() < readStopTime) { |
| // when there is only one page in the chunk, the page statistic is the same as the chunk, so |
| // we needn't filter the page again |
| skipCurrentPage(timePageHeader, valuePageHeaderList); |
| return null; |
| } |
| return constructAlignedPageReader(timePageHeader, valuePageHeaderList); |
| } |
| |
| private AlignedPageReader deserializeFromMultiPageChunk() throws IOException { |
| PageHeader timePageHeader = |
| PageHeader.deserializeFrom(timeChunkDataBuffer, timeChunkHeader.getDataType()); |
| List<PageHeader> valuePageHeaderList = new ArrayList<>(); |
| |
| boolean isAllNull = true; |
| for (int i = 0; i < valueChunkDataBufferList.size(); i++) { |
| if (valueChunkDataBufferList.get(i) != null) { |
| isAllNull = false; |
| valuePageHeaderList.add( |
| PageHeader.deserializeFrom( |
| valueChunkDataBufferList.get(i), valueChunkHeaderList.get(i).getDataType())); |
| } else { |
| valuePageHeaderList.add(null); |
| } |
| } |
| |
| if (isAllNull || timePageHeader.getEndTime() < readStopTime || pageCanSkip(timePageHeader)) { |
| skipCurrentPage(timePageHeader, valuePageHeaderList); |
| return null; |
| } |
| return constructAlignedPageReader(timePageHeader, valuePageHeaderList); |
| } |
| |
| private boolean pageCanSkip(PageHeader pageHeader) { |
| return queryFilter != null |
| && !queryFilter.satisfyStartEndTime(pageHeader.getStartTime(), pageHeader.getEndTime()); |
| } |
| |
| private void skipCurrentPage(PageHeader timePageHeader, List<PageHeader> valuePageHeader) { |
| timeChunkDataBuffer.position( |
| timeChunkDataBuffer.position() + timePageHeader.getCompressedSize()); |
| for (int i = 0; i < valuePageHeader.size(); i++) { |
| if (valuePageHeader.get(i) != null) { |
| valueChunkDataBufferList |
| .get(i) |
| .position( |
| valueChunkDataBufferList.get(i).position() |
| + valuePageHeader.get(i).getCompressedSize()); |
| } |
| } |
| } |
| |
| private AlignedPageReader constructAlignedPageReader( |
| PageHeader timePageHeader, List<PageHeader> rawValuePageHeaderList) throws IOException { |
| ByteBuffer timePageData = |
| ChunkReader.deserializePageData(timePageHeader, timeChunkDataBuffer, timeChunkHeader); |
| |
| List<PageHeader> valuePageHeaderList = new ArrayList<>(); |
| List<ByteBuffer> valuePageDataList = new ArrayList<>(); |
| List<TSDataType> valueDataTypeList = new ArrayList<>(); |
| List<Decoder> valueDecoderList = new ArrayList<>(); |
| |
| boolean isAllNull = true; |
| for (int i = 0; i < rawValuePageHeaderList.size(); i++) { |
| PageHeader valuePageHeader = rawValuePageHeaderList.get(i); |
| |
| if (valuePageHeader == null || valuePageHeader.getUncompressedSize() == 0) { |
| // Empty Page |
| valuePageHeaderList.add(null); |
| valuePageDataList.add(null); |
| valueDataTypeList.add(null); |
| valueDecoderList.add(null); |
| } else if (pageDeleted(valuePageHeader, valueDeleteIntervalsList.get(i))) { |
| valueChunkDataBufferList |
| .get(i) |
| .position( |
| valueChunkDataBufferList.get(i).position() + valuePageHeader.getCompressedSize()); |
| valuePageHeaderList.add(null); |
| valuePageDataList.add(null); |
| valueDataTypeList.add(null); |
| valueDecoderList.add(null); |
| } else { |
| ChunkHeader valueChunkHeader = valueChunkHeaderList.get(i); |
| valuePageHeaderList.add(valuePageHeader); |
| valuePageDataList.add( |
| ChunkReader.deserializePageData( |
| valuePageHeader, valueChunkDataBufferList.get(i), valueChunkHeader)); |
| valueDataTypeList.add(valueChunkHeader.getDataType()); |
| valueDecoderList.add( |
| Decoder.getDecoderByType( |
| valueChunkHeader.getEncodingType(), valueChunkHeader.getDataType())); |
| isAllNull = false; |
| } |
| } |
| if (isAllNull) { |
| return null; |
| } |
| AlignedPageReader alignedPageReader = |
| new AlignedPageReader( |
| timePageHeader, |
| timePageData, |
| defaultTimeDecoder, |
| valuePageHeaderList, |
| valuePageDataList, |
| valueDataTypeList, |
| valueDecoderList, |
| queryFilter); |
| alignedPageReader.setDeleteIntervalList(valueDeleteIntervalsList); |
| return alignedPageReader; |
| } |
| |
| private boolean pageDeleted(PageHeader pageHeader, List<TimeRange> deleteIntervals) { |
| if (pageHeader.getEndTime() < readStopTime) { |
| return true; |
| } |
| if (deleteIntervals != null) { |
| for (TimeRange range : deleteIntervals) { |
| if (range.contains(pageHeader.getStartTime(), pageHeader.getEndTime())) { |
| return true; |
| } |
| if (range.overlaps(new TimeRange(pageHeader.getStartTime(), pageHeader.getEndTime()))) { |
| pageHeader.setModified(true); |
| } |
| } |
| } |
| return false; |
| } |
| } |