| /* |
| * 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.utils.Pair; |
| import org.apache.iotdb.tsfile.utils.ReadWriteForEncodingUtils; |
| import org.apache.iotdb.tsfile.utils.ReadWriteIOUtils; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| import java.nio.ByteBuffer; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| public class MetadataIndexNode { |
| |
| protected static final TSFileConfig config = TSFileDescriptor.getInstance().getConfig(); |
| protected final List<IMetadataIndexEntry> children; |
| protected long endOffset; |
| |
| /** type of the child node at offset. */ |
| private final MetadataIndexNodeType nodeType; |
| |
| public MetadataIndexNode(MetadataIndexNodeType nodeType) { |
| children = new ArrayList<>(); |
| endOffset = -1L; |
| this.nodeType = nodeType; |
| } |
| |
| public MetadataIndexNode( |
| List<IMetadataIndexEntry> children, long endOffset, MetadataIndexNodeType nodeType) { |
| this.children = children; |
| this.endOffset = endOffset; |
| this.nodeType = nodeType; |
| } |
| |
| public List<IMetadataIndexEntry> getChildren() { |
| return children; |
| } |
| |
| public long getEndOffset() { |
| return endOffset; |
| } |
| |
| public void setEndOffset(long endOffset) { |
| this.endOffset = endOffset; |
| } |
| |
| public MetadataIndexNodeType getNodeType() { |
| return nodeType; |
| } |
| |
| public void addEntry(IMetadataIndexEntry metadataIndexEntry) { |
| this.children.add(metadataIndexEntry); |
| } |
| |
| public boolean isFull() { |
| return children.size() >= config.getMaxDegreeOfIndexNode(); |
| } |
| |
| IMetadataIndexEntry peek() { |
| if (children.isEmpty()) { |
| return null; |
| } |
| return children.get(0); |
| } |
| |
| public int serializeTo(OutputStream outputStream) throws IOException { |
| int byteLen = 0; |
| byteLen += ReadWriteForEncodingUtils.writeUnsignedVarInt(children.size(), outputStream); |
| for (IMetadataIndexEntry metadataIndexEntry : children) { |
| byteLen += metadataIndexEntry.serializeTo(outputStream); |
| } |
| byteLen += ReadWriteIOUtils.write(endOffset, outputStream); |
| byteLen += ReadWriteIOUtils.write(nodeType.serialize(), outputStream); |
| return byteLen; |
| } |
| |
| public static MetadataIndexNode deserializeFrom(ByteBuffer buffer, boolean isDeviceLevel) { |
| List<IMetadataIndexEntry> children = new ArrayList<>(); |
| int size = ReadWriteForEncodingUtils.readUnsignedVarInt(buffer); |
| for (int i = 0; i < size; i++) { |
| if (isDeviceLevel) { |
| children.add(DeviceMetadataIndexEntry.deserializeFrom(buffer)); |
| } else { |
| children.add(MeasurementMetadataIndexEntry.deserializeFrom(buffer)); |
| } |
| } |
| long offset = ReadWriteIOUtils.readLong(buffer); |
| MetadataIndexNodeType nodeType = |
| MetadataIndexNodeType.deserialize(ReadWriteIOUtils.readByte(buffer)); |
| return new MetadataIndexNode(children, offset, nodeType); |
| } |
| |
| public static MetadataIndexNode deserializeFrom(InputStream inputStream, boolean isDeviceLevel) |
| throws IOException { |
| List<IMetadataIndexEntry> children = new ArrayList<>(); |
| int size = ReadWriteForEncodingUtils.readUnsignedVarInt(inputStream); |
| for (int i = 0; i < size; i++) { |
| if (isDeviceLevel) { |
| children.add(DeviceMetadataIndexEntry.deserializeFrom(inputStream)); |
| } else { |
| children.add(MeasurementMetadataIndexEntry.deserializeFrom(inputStream)); |
| } |
| } |
| long offset = ReadWriteIOUtils.readLong(inputStream); |
| MetadataIndexNodeType nodeType = |
| MetadataIndexNodeType.deserialize(ReadWriteIOUtils.readByte(inputStream)); |
| return new MetadataIndexNode(children, offset, nodeType); |
| } |
| |
| public Pair<IMetadataIndexEntry, Long> getChildIndexEntry(Comparable key, boolean exactSearch) { |
| int index = binarySearchInChildren(key, exactSearch); |
| if (index == -1) { |
| return null; |
| } |
| long childEndOffset; |
| if (index != children.size() - 1) { |
| childEndOffset = children.get(index + 1).getOffset(); |
| } else { |
| childEndOffset = this.endOffset; |
| } |
| return new Pair<>(children.get(index), childEndOffset); |
| } |
| |
| int binarySearchInChildren(Comparable key, boolean exactSearch) { |
| int low = 0; |
| int high = children.size() - 1; |
| |
| while (low <= high) { |
| int mid = (low + high) >>> 1; |
| IMetadataIndexEntry midVal = children.get(mid); |
| int cmp = midVal.getCompareKey().compareTo(key); |
| |
| if (cmp < 0) { |
| low = mid + 1; |
| } else if (cmp > 0) { |
| high = mid - 1; |
| } else { |
| return mid; // key found |
| } |
| } |
| |
| // key not found |
| if (exactSearch) { |
| return -1; |
| } else { |
| return low == 0 ? low : low - 1; |
| } |
| } |
| |
| public boolean isDeviceLevel() { |
| return this.nodeType == MetadataIndexNodeType.INTERNAL_DEVICE |
| || this.nodeType == MetadataIndexNodeType.LEAF_DEVICE; |
| } |
| } |