/
FileLoaderUtils.java
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/
FileLoaderUtils.java
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/*
* 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.utils;
import org.apache.iotdb.db.engine.cache.ChunkMetadataCache;
import org.apache.iotdb.db.engine.cache.TimeSeriesMetadataCache;
import org.apache.iotdb.db.engine.modification.Modification;
import org.apache.iotdb.db.engine.querycontext.ReadOnlyMemChunk;
import org.apache.iotdb.db.engine.storagegroup.TsFileResource;
import org.apache.iotdb.db.query.context.QueryContext;
import org.apache.iotdb.db.query.control.FileReaderManager;
import org.apache.iotdb.db.query.reader.chunk.DiskChunkLoader;
import org.apache.iotdb.db.query.reader.chunk.MemChunkLoader;
import org.apache.iotdb.db.query.reader.chunk.MemChunkReader;
import org.apache.iotdb.db.query.reader.chunk.metadata.DiskChunkMetadataLoader;
import org.apache.iotdb.db.query.reader.chunk.metadata.MemChunkMetadataLoader;
import org.apache.iotdb.tsfile.file.metadata.ChunkMetadata;
import org.apache.iotdb.tsfile.file.metadata.TimeseriesMetadata;
import org.apache.iotdb.tsfile.file.metadata.TsFileMetadata;
import org.apache.iotdb.tsfile.read.TsFileSequenceReader;
import org.apache.iotdb.tsfile.read.common.Chunk;
import org.apache.iotdb.tsfile.read.common.Path;
import org.apache.iotdb.tsfile.read.controller.IChunkLoader;
import org.apache.iotdb.tsfile.read.filter.basic.Filter;
import org.apache.iotdb.tsfile.read.reader.IChunkReader;
import org.apache.iotdb.tsfile.read.reader.IPageReader;
import org.apache.iotdb.tsfile.read.reader.chunk.ChunkReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Set;
public class FileLoaderUtils {
private FileLoaderUtils() {
}
public static void checkTsFileResource(TsFileResource tsFileResource) throws IOException {
if (!tsFileResource.fileExists()) {
// .resource file does not exist, read file metadata and recover tsfile resource
try (TsFileSequenceReader reader = new TsFileSequenceReader(
tsFileResource.getFile().getAbsolutePath())) {
TsFileMetadata metaData = reader.readFileMetadata();
updateTsFileResource(metaData, reader, tsFileResource);
}
// write .resource file
tsFileResource.serialize();
} else {
tsFileResource.deserialize();
}
tsFileResource.setClosed(true);
}
public static void updateTsFileResource(TsFileMetadata metaData, TsFileSequenceReader reader,
TsFileResource tsFileResource) throws IOException {
for (String device : metaData.getDeviceMetadataIndex().keySet()) {
Map<String, TimeseriesMetadata> chunkMetadataListInOneDevice = reader
.readDeviceMetadata(device);
for (TimeseriesMetadata timeseriesMetaData : chunkMetadataListInOneDevice.values()) {
tsFileResource.updateStartTime(device, timeseriesMetaData.getStatistics().getStartTime());
tsFileResource.updateEndTime(device, timeseriesMetaData.getStatistics().getEndTime());
}
}
}
/**
*
* @param resource TsFile
* @param seriesPath Timeseries path
* @param allSensors measurements queried at the same time of this device
*/
public static TimeseriesMetadata loadTimeSeriesMetadata(TsFileResource resource, Path seriesPath,
QueryContext context, Filter timeFilter, Set<String> allSensors) throws IOException {
TimeseriesMetadata timeSeriesMetadata;
if (resource.isClosed()) {
timeSeriesMetadata = TimeSeriesMetadataCache.getInstance()
.get(new TimeSeriesMetadataCache.TimeSeriesMetadataCacheKey(resource.getPath(),
seriesPath.getDevice(), seriesPath.getMeasurement()), allSensors);
if (timeSeriesMetadata != null) {
timeSeriesMetadata.setChunkMetadataLoader(
new DiskChunkMetadataLoader(resource, seriesPath, context, timeFilter));
}
} else {
timeSeriesMetadata = resource.getTimeSeriesMetadata();
if (timeSeriesMetadata != null) {
timeSeriesMetadata.setChunkMetadataLoader(
new MemChunkMetadataLoader(resource, seriesPath, context, timeFilter));
}
}
if (timeSeriesMetadata != null) {
List<Modification> pathModifications =
context.getPathModifications(resource.getModFile(), seriesPath.getFullPath());
timeSeriesMetadata.getStatistics().setCanUseStatistics(pathModifications.isEmpty());
if (timeSeriesMetadata.getStatistics().getStartTime() > timeSeriesMetadata.getStatistics()
.getEndTime()) {
return null;
}
if (timeFilter != null && !timeFilter
.satisfyStartEndTime(timeSeriesMetadata.getStatistics().getStartTime(),
timeSeriesMetadata.getStatistics().getEndTime())) {
return null;
}
}
return timeSeriesMetadata;
}
/**
* load all chunk metadata of one time series in one file.
* @param timeSeriesMetadata the corresponding TimeSeriesMetadata in that file.
*/
public static List<ChunkMetadata> loadChunkMetadata(TimeseriesMetadata timeSeriesMetadata) throws IOException {
return timeSeriesMetadata.loadChunkMetadataList();
}
/**
* load all page readers in one chunk that satisfying the timeFilter
* @param chunkMetaData the corresponding chunk metadata
* @param timeFilter it should be a TimeFilter instead of a ValueFilter
*/
public static List<IPageReader> loadPageReader(ChunkMetadata chunkMetaData, Filter timeFilter) throws IOException {
return initChunkReader(chunkMetaData, timeFilter).loadPageReaderList();
}
private static IChunkReader initChunkReader(ChunkMetadata metaData, Filter timeFilter) throws IOException {
if (metaData == null) {
throw new IOException("Can't init null chunkMeta");
}
IChunkReader chunkReader;
IChunkLoader chunkLoader = metaData.getChunkLoader();
if (chunkLoader instanceof MemChunkLoader) {
MemChunkLoader memChunkLoader = (MemChunkLoader) chunkLoader;
chunkReader = new MemChunkReader(memChunkLoader.getChunk(), timeFilter);
} else {
Chunk chunk = chunkLoader.loadChunk(metaData);
chunkReader = new ChunkReader(chunk, timeFilter);
chunkReader.hasNextSatisfiedPage();
}
return chunkReader;
}
/**
* load all ChunkMetadatas belong to the seriesPath
*/
public static List<ChunkMetadata> loadChunkMetadataFromTsFileResource(
TsFileResource resource, Path seriesPath, QueryContext context) throws IOException {
List<ChunkMetadata> chunkMetadataList;
if (resource == null) {
return new ArrayList<>();
}
if (resource.isClosed()) {
chunkMetadataList = ChunkMetadataCache.getInstance().get(resource.getPath(), seriesPath);
} else {
chunkMetadataList = resource.getChunkMetadataList();
}
List<Modification> pathModifications =
context.getPathModifications(resource.getModFile(), seriesPath.getFullPath());
if (!pathModifications.isEmpty()) {
QueryUtils.modifyChunkMetaData(chunkMetadataList, pathModifications);
}
TsFileSequenceReader tsFileSequenceReader =
FileReaderManager.getInstance().get(resource.getPath(), resource.isClosed());
for (ChunkMetadata data : chunkMetadataList) {
data.setChunkLoader(new DiskChunkLoader(tsFileSequenceReader));
}
List<ReadOnlyMemChunk> memChunks = resource.getReadOnlyMemChunk();
if (memChunks != null) {
for (ReadOnlyMemChunk readOnlyMemChunk : memChunks) {
if (!memChunks.isEmpty()) {
chunkMetadataList.add(readOnlyMemChunk.getChunkMetaData());
}
}
}
/*
* remove empty or invalid chunk metadata
*/
chunkMetadataList.removeIf(chunkMetaData -> (
chunkMetaData.getStartTime() > chunkMetaData.getEndTime()));
return chunkMetadataList;
}
public static List<ChunkMetadata> getChunkMetadataList(Path path, String filePath) throws IOException {
TsFileSequenceReader tsFileReader = FileReaderManager.getInstance().get(filePath, true);
return tsFileReader.getChunkMetadataList(path);
}
public static TsFileMetadata getTsFileMetadata(String filePath) throws IOException {
TsFileSequenceReader reader = FileReaderManager.getInstance().get(filePath, true);
return reader.readFileMetadata();
}
}