| /* |
| * 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.query.reader.series; |
| |
| import org.apache.iotdb.db.engine.querycontext.QueryDataSource; |
| import org.apache.iotdb.db.engine.storagegroup.TsFileResource; |
| import org.apache.iotdb.db.metadata.PartialPath; |
| import org.apache.iotdb.db.query.context.QueryContext; |
| import org.apache.iotdb.db.query.filter.TsFileFilter; |
| import org.apache.iotdb.db.utils.TestOnly; |
| import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType; |
| import org.apache.iotdb.tsfile.read.common.BatchData; |
| import org.apache.iotdb.tsfile.read.filter.basic.Filter; |
| |
| import java.io.IOException; |
| import java.util.HashSet; |
| import java.util.List; |
| import java.util.Set; |
| |
| public class SeriesRawDataBatchReader implements ManagedSeriesReader { |
| |
| private final SeriesReader seriesReader; |
| |
| private boolean hasRemaining; |
| private boolean managedByQueryManager; |
| |
| private BatchData batchData; |
| private boolean hasCachedBatchData = false; |
| |
| public SeriesRawDataBatchReader(SeriesReader seriesReader) { |
| this.seriesReader = seriesReader; |
| } |
| |
| public SeriesRawDataBatchReader( |
| PartialPath seriesPath, |
| Set<String> allSensors, |
| TSDataType dataType, |
| QueryContext context, |
| QueryDataSource dataSource, |
| Filter timeFilter, |
| Filter valueFilter, |
| TsFileFilter fileFilter, |
| boolean ascending) { |
| this.seriesReader = |
| new SeriesReader( |
| seriesPath, |
| allSensors, |
| dataType, |
| context, |
| dataSource, |
| timeFilter, |
| valueFilter, |
| fileFilter, |
| ascending); |
| } |
| |
| @TestOnly |
| @SuppressWarnings("squid:S107") |
| public SeriesRawDataBatchReader( |
| PartialPath seriesPath, |
| TSDataType dataType, |
| QueryContext context, |
| List<TsFileResource> seqFileResource, |
| List<TsFileResource> unseqFileResource, |
| Filter timeFilter, |
| Filter valueFilter, |
| boolean ascending) { |
| Set<String> allSensors = new HashSet<>(); |
| allSensors.add(seriesPath.getMeasurement()); |
| this.seriesReader = |
| new SeriesReader( |
| seriesPath, |
| allSensors, |
| dataType, |
| context, |
| seqFileResource, |
| unseqFileResource, |
| timeFilter, |
| valueFilter, |
| ascending); |
| } |
| |
| /** |
| * This method overrides the AbstractDataReader.hasNextOverlappedPage for pause reads, to achieve |
| * a continuous read |
| */ |
| @Override |
| public boolean hasNextBatch() throws IOException { |
| |
| if (hasCachedBatchData) { |
| return true; |
| } |
| |
| /* |
| * consume page data firstly |
| */ |
| if (readPageData()) { |
| hasCachedBatchData = true; |
| return true; |
| } |
| |
| /* |
| * consume chunk data secondly |
| */ |
| if (readChunkData()) { |
| hasCachedBatchData = true; |
| return true; |
| } |
| |
| /* |
| * consume next file finally |
| */ |
| while (seriesReader.hasNextFile()) { |
| if (readChunkData()) { |
| hasCachedBatchData = true; |
| return true; |
| } |
| } |
| return hasCachedBatchData; |
| } |
| |
| @Override |
| public BatchData nextBatch() throws IOException { |
| if (hasCachedBatchData || hasNextBatch()) { |
| hasCachedBatchData = false; |
| return batchData; |
| } |
| throw new IOException("no next batch"); |
| } |
| |
| @Override |
| public void close() throws IOException { |
| // no resources need to close |
| } |
| |
| @Override |
| public boolean isManagedByQueryManager() { |
| return managedByQueryManager; |
| } |
| |
| @Override |
| public void setManagedByQueryManager(boolean managedByQueryManager) { |
| this.managedByQueryManager = managedByQueryManager; |
| } |
| |
| @Override |
| public boolean hasRemaining() { |
| return hasRemaining; |
| } |
| |
| @Override |
| public void setHasRemaining(boolean hasRemaining) { |
| this.hasRemaining = hasRemaining; |
| } |
| |
| private boolean readChunkData() throws IOException { |
| while (seriesReader.hasNextChunk()) { |
| if (readPageData()) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| private boolean readPageData() throws IOException { |
| while (seriesReader.hasNextPage()) { |
| batchData = seriesReader.nextPage(); |
| if (!isEmpty(batchData)) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| private boolean isEmpty(BatchData batchData) { |
| return batchData == null || !batchData.hasCurrent(); |
| } |
| } |