| /* |
| * 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.storageengine.dataregion.read.reader.chunk; |
| |
| import org.apache.iotdb.db.storageengine.dataregion.memtable.ReadOnlyMemChunk; |
| import org.apache.iotdb.tsfile.read.TimeValuePair; |
| import org.apache.iotdb.tsfile.read.common.BatchData; |
| 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.IPointReader; |
| |
| import java.io.IOException; |
| import java.util.Collections; |
| import java.util.List; |
| |
| /** To read chunk data in memory. */ |
| public class MemChunkReader implements IChunkReader, IPointReader { |
| |
| private final IPointReader timeValuePairIterator; |
| private final Filter globalTimeFilter; |
| private final List<IPageReader> pageReaderList; |
| |
| private boolean hasCachedTimeValuePair; |
| private TimeValuePair cachedTimeValuePair; |
| |
| public MemChunkReader(ReadOnlyMemChunk readableChunk, Filter globalTimeFilter) { |
| timeValuePairIterator = readableChunk.getPointReader(); |
| this.globalTimeFilter = globalTimeFilter; |
| // we treat one ReadOnlyMemChunk as one Page |
| this.pageReaderList = |
| Collections.singletonList( |
| new MemPageReader( |
| readableChunk.getTsBlock(), readableChunk.getChunkMetaData(), globalTimeFilter)); |
| } |
| |
| @Override |
| public boolean hasNextTimeValuePair() throws IOException { |
| if (hasCachedTimeValuePair) { |
| return true; |
| } |
| while (timeValuePairIterator.hasNextTimeValuePair()) { |
| TimeValuePair timeValuePair = timeValuePairIterator.nextTimeValuePair(); |
| if (globalTimeFilter == null |
| || globalTimeFilter.satisfy( |
| timeValuePair.getTimestamp(), timeValuePair.getValue().getValue())) { |
| hasCachedTimeValuePair = true; |
| cachedTimeValuePair = timeValuePair; |
| break; |
| } |
| } |
| return hasCachedTimeValuePair; |
| } |
| |
| @Override |
| public TimeValuePair nextTimeValuePair() throws IOException { |
| if (hasCachedTimeValuePair) { |
| hasCachedTimeValuePair = false; |
| return cachedTimeValuePair; |
| } else { |
| return timeValuePairIterator.nextTimeValuePair(); |
| } |
| } |
| |
| @Override |
| public TimeValuePair currentTimeValuePair() throws IOException { |
| if (!hasCachedTimeValuePair) { |
| cachedTimeValuePair = timeValuePairIterator.nextTimeValuePair(); |
| hasCachedTimeValuePair = true; |
| } |
| return cachedTimeValuePair; |
| } |
| |
| @Override |
| public boolean hasNextSatisfiedPage() throws IOException { |
| return hasNextTimeValuePair(); |
| } |
| |
| @Override |
| public BatchData nextPageData() throws IOException { |
| return pageReaderList.remove(0).getAllSatisfiedPageData(); |
| } |
| |
| @Override |
| public long getUsedMemorySize() { |
| // not used |
| return timeValuePairIterator.getUsedMemorySize(); |
| } |
| |
| @Override |
| public void close() { |
| // Do nothing because mem chunk reader will not open files |
| } |
| |
| @Override |
| public List<IPageReader> loadPageReaderList() { |
| return this.pageReaderList; |
| } |
| } |