| /* |
| * 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.file.metadata; |
| |
| import org.apache.iotdb.tsfile.common.conf.TSFileConfig; |
| import org.apache.iotdb.tsfile.common.conf.TSFileDescriptor; |
| import org.apache.iotdb.tsfile.file.IMetadataIndexEntry; |
| import org.apache.iotdb.tsfile.file.metadata.enums.MetadataIndexNodeType; |
| import org.apache.iotdb.tsfile.write.writer.TsFileOutput; |
| |
| import java.io.IOException; |
| import java.util.ArrayDeque; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Map.Entry; |
| import java.util.Queue; |
| import java.util.TreeMap; |
| |
| public class MetadataIndexConstructor { |
| |
| private static final TSFileConfig config = TSFileDescriptor.getInstance().getConfig(); |
| |
| private MetadataIndexConstructor() { |
| throw new IllegalStateException("Utility class"); |
| } |
| |
| /** |
| * Construct metadata index tree. |
| * |
| * @param deviceTimeseriesMetadataMap device => TimeseriesMetadata list |
| * @param out tsfile output |
| * @throws IOException exception when operating stream |
| */ |
| @SuppressWarnings("squid:S3776") // Suppress high Cognitive Complexity warning |
| public static MetadataIndexNode constructMetadataIndex( |
| Map<IDeviceID, List<TimeseriesMetadata>> deviceTimeseriesMetadataMap, TsFileOutput out) |
| throws IOException { |
| |
| Map<IDeviceID, MetadataIndexNode> deviceMetadataIndexMap = new TreeMap<>(); |
| |
| // for timeseriesMetadata of each device |
| for (Entry<IDeviceID, List<TimeseriesMetadata>> entry : |
| deviceTimeseriesMetadataMap.entrySet()) { |
| if (entry.getValue().isEmpty()) { |
| continue; |
| } |
| Queue<MetadataIndexNode> measurementMetadataIndexQueue = new ArrayDeque<>(); |
| TimeseriesMetadata timeseriesMetadata; |
| MetadataIndexNode currentIndexNode = |
| new MetadataIndexNode(MetadataIndexNodeType.LEAF_MEASUREMENT); |
| for (int i = 0; i < entry.getValue().size(); i++) { |
| timeseriesMetadata = entry.getValue().get(i); |
| if (i % config.getMaxDegreeOfIndexNode() == 0) { |
| if (currentIndexNode.isFull()) { |
| addCurrentIndexNodeToQueue(currentIndexNode, measurementMetadataIndexQueue, out); |
| currentIndexNode = new MetadataIndexNode(MetadataIndexNodeType.LEAF_MEASUREMENT); |
| } |
| currentIndexNode.addEntry( |
| new MeasurementMetadataIndexEntry( |
| timeseriesMetadata.getMeasurementId(), out.getPosition())); |
| } |
| timeseriesMetadata.serializeTo(out.wrapAsStream()); |
| } |
| addCurrentIndexNodeToQueue(currentIndexNode, measurementMetadataIndexQueue, out); |
| deviceMetadataIndexMap.put( |
| entry.getKey(), |
| generateRootNode( |
| measurementMetadataIndexQueue, out, MetadataIndexNodeType.INTERNAL_MEASUREMENT)); |
| } |
| |
| return checkAndBuildLevelIndex(deviceMetadataIndexMap, out); |
| } |
| |
| public static MetadataIndexNode checkAndBuildLevelIndex( |
| Map<IDeviceID, MetadataIndexNode> deviceMetadataIndexMap, TsFileOutput out) |
| throws IOException { |
| // if not exceed the max child nodes num, ignore the device index and directly point to the |
| // measurement |
| if (deviceMetadataIndexMap.size() <= config.getMaxDegreeOfIndexNode()) { |
| MetadataIndexNode metadataIndexNode = |
| new MetadataIndexNode(MetadataIndexNodeType.LEAF_DEVICE); |
| for (Map.Entry<IDeviceID, MetadataIndexNode> entry : deviceMetadataIndexMap.entrySet()) { |
| metadataIndexNode.addEntry(new DeviceMetadataIndexEntry(entry.getKey(), out.getPosition())); |
| entry.getValue().serializeTo(out.wrapAsStream()); |
| } |
| metadataIndexNode.setEndOffset(out.getPosition()); |
| return metadataIndexNode; |
| } |
| |
| // else, build level index for devices |
| Queue<MetadataIndexNode> deviceMetadataIndexQueue = new ArrayDeque<>(); |
| MetadataIndexNode currentIndexNode = new MetadataIndexNode(MetadataIndexNodeType.LEAF_DEVICE); |
| |
| for (Map.Entry<IDeviceID, MetadataIndexNode> entry : deviceMetadataIndexMap.entrySet()) { |
| // when constructing from internal node, each node is related to an entry |
| if (currentIndexNode.isFull()) { |
| addCurrentIndexNodeToQueue(currentIndexNode, deviceMetadataIndexQueue, out); |
| currentIndexNode = new MetadataIndexNode(MetadataIndexNodeType.LEAF_DEVICE); |
| } |
| currentIndexNode.addEntry(new DeviceMetadataIndexEntry(entry.getKey(), out.getPosition())); |
| entry.getValue().serializeTo(out.wrapAsStream()); |
| } |
| addCurrentIndexNodeToQueue(currentIndexNode, deviceMetadataIndexQueue, out); |
| MetadataIndexNode deviceMetadataIndexNode = |
| generateRootNode(deviceMetadataIndexQueue, out, MetadataIndexNodeType.INTERNAL_DEVICE); |
| deviceMetadataIndexNode.setEndOffset(out.getPosition()); |
| return deviceMetadataIndexNode; |
| } |
| |
| /** |
| * Generate root node, using the nodes in the queue as leaf nodes. The final metadata tree has two |
| * levels: measurement leaf nodes will generate to measurement root node; device leaf nodes will |
| * generate to device root node |
| * |
| * @param metadataIndexNodeQueue queue of metadataIndexNode |
| * @param out tsfile output |
| * @param type MetadataIndexNode type |
| * @throws IOException exception when operating stream |
| */ |
| public static MetadataIndexNode generateRootNode( |
| Queue<MetadataIndexNode> metadataIndexNodeQueue, TsFileOutput out, MetadataIndexNodeType type) |
| throws IOException { |
| int queueSize = metadataIndexNodeQueue.size(); |
| MetadataIndexNode metadataIndexNode; |
| MetadataIndexNode currentIndexNode = new MetadataIndexNode(type); |
| while (queueSize != 1) { |
| for (int i = 0; i < queueSize; i++) { |
| metadataIndexNode = metadataIndexNodeQueue.poll(); |
| // when constructing from internal node, each node is related to an entry |
| if (currentIndexNode.isFull()) { |
| addCurrentIndexNodeToQueue(currentIndexNode, metadataIndexNodeQueue, out); |
| currentIndexNode = new MetadataIndexNode(type); |
| } |
| IMetadataIndexEntry entry = null; |
| if (metadataIndexNode.isDeviceLevel()) { |
| entry = |
| new DeviceMetadataIndexEntry( |
| ((DeviceMetadataIndexEntry) metadataIndexNode.peek()).getDeviceID(), |
| out.getPosition()); |
| } else { |
| entry = |
| new MeasurementMetadataIndexEntry( |
| ((MeasurementMetadataIndexEntry) metadataIndexNode.peek()).getName(), |
| out.getPosition()); |
| } |
| currentIndexNode.addEntry(entry); |
| metadataIndexNode.serializeTo(out.wrapAsStream()); |
| } |
| addCurrentIndexNodeToQueue(currentIndexNode, metadataIndexNodeQueue, out); |
| currentIndexNode = new MetadataIndexNode(type); |
| queueSize = metadataIndexNodeQueue.size(); |
| } |
| return metadataIndexNodeQueue.poll(); |
| } |
| |
| public static void addCurrentIndexNodeToQueue( |
| MetadataIndexNode currentIndexNode, |
| Queue<MetadataIndexNode> metadataIndexNodeQueue, |
| TsFileOutput out) |
| throws IOException { |
| currentIndexNode.setEndOffset(out.getPosition()); |
| metadataIndexNodeQueue.add(currentIndexNode); |
| } |
| } |