| /* |
| * 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.sort; |
| |
| import org.apache.iotdb.commons.exception.IoTDBException; |
| import org.apache.iotdb.db.utils.datastructure.MergeSortKey; |
| import org.apache.iotdb.rpc.TSStatusCode; |
| |
| import org.apache.tsfile.common.conf.TSFileDescriptor; |
| import org.apache.tsfile.read.common.block.TsBlock; |
| import org.apache.tsfile.read.common.block.column.TsBlockSerde; |
| |
| import java.io.IOException; |
| import java.nio.ByteBuffer; |
| import java.nio.channels.FileChannel; |
| import java.nio.file.Paths; |
| import java.nio.file.StandardOpenOption; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| public class FileSpillerReader implements SortReader { |
| |
| private final FileChannel fileChannel; |
| private final List<TsBlock> cacheBlocks; |
| private final SortBufferManager sortBufferManager; |
| private final String fileName; |
| private final TsBlockSerde serde; |
| |
| private int tsBlockIndex; |
| private int rowIndex; |
| private boolean isEnd = false; |
| |
| private static final int DEFAULT_MAX_TSBLOCK_SIZE_IN_BYTES = |
| TSFileDescriptor.getInstance().getConfig().getMaxTsBlockSizeInBytes(); |
| |
| public FileSpillerReader(String fileName, SortBufferManager sortBufferManager, TsBlockSerde serde) |
| throws IOException { |
| this.fileChannel = FileChannel.open(Paths.get(fileName), StandardOpenOption.READ); |
| this.cacheBlocks = new ArrayList<>(); |
| this.rowIndex = 0; |
| this.fileName = fileName; |
| this.sortBufferManager = sortBufferManager; |
| this.serde = serde; |
| } |
| |
| @Override |
| public MergeSortKey next() { |
| MergeSortKey sortKey = new MergeSortKey(cacheBlocks.get(tsBlockIndex), rowIndex); |
| rowIndex++; |
| return sortKey; |
| } |
| |
| private boolean readTsBlockFromFile() throws IoTDBException { |
| long bufferSize = sortBufferManager.getReaderBufferAvailable(); |
| cacheBlocks.clear(); |
| while (bufferSize >= DEFAULT_MAX_TSBLOCK_SIZE_IN_BYTES) { |
| long size = read(); |
| if (size == -1) { |
| break; |
| } |
| bufferSize -= size; |
| } |
| |
| if (cacheBlocks.isEmpty()) { |
| return false; |
| } |
| rowIndex = 0; |
| tsBlockIndex = 0; |
| return true; |
| } |
| |
| private long read() throws IoTDBException { |
| try { |
| ByteBuffer bytes = ByteBuffer.allocate(4); |
| int readLen = fileChannel.read(bytes); |
| if (readLen == -1) { |
| return -1; |
| } |
| bytes.flip(); |
| int capacity = bytes.getInt(); |
| ByteBuffer tsBlockBytes = ByteBuffer.allocate(capacity); |
| fileChannel.read(tsBlockBytes); |
| tsBlockBytes.flip(); |
| TsBlock cachedTsBlock = serde.deserialize(tsBlockBytes); |
| cacheBlocks.add(cachedTsBlock); |
| return cachedTsBlock.getRetainedSizeInBytes(); |
| } catch (IOException e) { |
| throw new IoTDBException( |
| "Can't read a new tsBlock in FileSpillerReader: " + fileName, |
| e, |
| TSStatusCode.INTERNAL_SERVER_ERROR.getStatusCode()); |
| } |
| } |
| |
| @Override |
| public boolean hasNext() throws IoTDBException { |
| |
| if (isEnd) { |
| return false; |
| } |
| |
| if (cacheBlocks.isEmpty() |
| || (rowIndex == cacheBlocks.get(tsBlockIndex).getPositionCount() |
| && tsBlockIndex == cacheBlocks.size() - 1)) { |
| boolean hasData = readTsBlockFromFile(); |
| if (!hasData) { |
| isEnd = true; |
| return false; |
| } |
| return true; |
| } |
| |
| if (rowIndex < cacheBlocks.get(tsBlockIndex).getPositionCount()) { |
| return true; |
| } |
| |
| tsBlockIndex++; |
| rowIndex = 0; |
| return true; |
| } |
| |
| @Override |
| public void close() throws IoTDBException { |
| try { |
| fileChannel.close(); |
| } catch (IOException e) { |
| throw new IoTDBException( |
| "Can't close fileChannel in FileSpillerReader: " + fileName, |
| e, |
| TSStatusCode.INTERNAL_SERVER_ERROR.getStatusCode()); |
| } |
| } |
| } |