| /* |
| * 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.db.storageengine.dataregion.read.reader.chunk; |
| |
| import org.apache.iotdb.db.queryengine.execution.fragment.QueryContext; |
| import org.apache.iotdb.db.queryengine.metric.SeriesScanCostMetricSet; |
| import org.apache.iotdb.db.storageengine.dataregion.memtable.ReadOnlyMemChunk; |
| |
| import org.apache.tsfile.file.metadata.ChunkMetadata; |
| import org.apache.tsfile.file.metadata.IChunkMetadata; |
| import org.apache.tsfile.read.common.Chunk; |
| import org.apache.tsfile.read.controller.IChunkLoader; |
| import org.apache.tsfile.read.filter.basic.Filter; |
| import org.apache.tsfile.read.reader.IChunkReader; |
| |
| import static org.apache.iotdb.db.queryengine.metric.SeriesScanCostMetricSet.INIT_CHUNK_READER_NONALIGNED_MEM; |
| |
| /** To read one chunk from memory, and only used in iotdb server module. */ |
| public class MemChunkLoader implements IChunkLoader { |
| private final QueryContext context; |
| private final ReadOnlyMemChunk chunk; |
| |
| private static final SeriesScanCostMetricSet SERIES_SCAN_COST_METRIC_SET = |
| SeriesScanCostMetricSet.getInstance(); |
| |
| public MemChunkLoader(QueryContext context, ReadOnlyMemChunk chunk) { |
| this.context = context; |
| this.chunk = chunk; |
| } |
| |
| @Override |
| public Chunk loadChunk(ChunkMetadata chunkMetaData) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public void close() { |
| // no resources need to close |
| } |
| |
| @Override |
| public IChunkReader getChunkReader(IChunkMetadata chunkMetaData, Filter globalTimeFilter) { |
| long startTime = System.nanoTime(); |
| try { |
| return new MemChunkReader(chunk, globalTimeFilter); |
| } finally { |
| long duration = System.nanoTime() - startTime; |
| context.getQueryStatistics().constructNonAlignedChunkReadersMemCount.getAndAdd(1); |
| context.getQueryStatistics().constructNonAlignedChunkReadersMemTime.getAndAdd(duration); |
| SERIES_SCAN_COST_METRIC_SET.recordSeriesScanCost(INIT_CHUNK_READER_NONALIGNED_MEM, duration); |
| } |
| } |
| } |