| /* |
| * 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.queryengine.execution.operator.window; |
| |
| import org.apache.iotdb.db.queryengine.execution.aggregation.Aggregator; |
| |
| import org.apache.tsfile.enums.TSDataType; |
| import org.apache.tsfile.read.common.block.TsBlock; |
| import org.apache.tsfile.read.common.block.TsBlockBuilder; |
| import org.apache.tsfile.read.common.block.column.TimeColumn; |
| |
| import java.util.List; |
| |
| public class SessionWindowManager implements IWindowManager { |
| |
| private final boolean isNeedOutputEndTime; |
| |
| private boolean initialized; |
| |
| private boolean needSkip; |
| |
| private final SessionWindow sessionWindow; |
| |
| public SessionWindowManager(boolean isNeedOutputEndTime, long timeInterval, boolean ascending) { |
| this.isNeedOutputEndTime = isNeedOutputEndTime; |
| this.initialized = false; |
| // At beginning, we do not need to skip inputTsBlock |
| this.needSkip = false; |
| this.sessionWindow = new SessionWindow(timeInterval, ascending); |
| } |
| |
| @Override |
| public boolean isCurWindowInit() { |
| return this.initialized; |
| } |
| |
| @Override |
| public void initCurWindow() { |
| this.initialized = true; |
| this.sessionWindow.setInitializedTimeValue(false); |
| } |
| |
| @Override |
| public boolean hasNext(boolean hasMoreData) { |
| return hasMoreData; |
| } |
| |
| @Override |
| public void next() { |
| // When we go into next window, we should pay attention to previous window whether all points |
| // belong to previous window have been consumed. If not, we need skip these points. |
| this.needSkip = true; |
| this.initialized = false; |
| this.sessionWindow.setLastTsBlockTime(0); |
| } |
| |
| @Override |
| public IWindow getCurWindow() { |
| return sessionWindow; |
| } |
| |
| @Override |
| public TsBlock skipPointsOutOfCurWindow(TsBlock inputTsBlock) { |
| if (!needSkip) { |
| return inputTsBlock; |
| } |
| |
| if (inputTsBlock == null || inputTsBlock.isEmpty()) { |
| return inputTsBlock; |
| } |
| |
| TimeColumn timeColumn = inputTsBlock.getTimeColumn(); |
| int i = 0; |
| int size = inputTsBlock.getPositionCount(); |
| long previousTimeValue = sessionWindow.getTimeValue(); |
| |
| for (; i < size; i++) { |
| long currentTime = timeColumn.getLong(i); |
| if (Math.abs(currentTime - previousTimeValue) > sessionWindow.getTimeInterval()) { |
| sessionWindow.setTimeValue(previousTimeValue); |
| break; |
| } |
| // judge whether we need update endTime |
| if (sessionWindow.getStartTime() > currentTime) { |
| sessionWindow.setStartTime(currentTime); |
| } |
| // judge whether we need update endTime |
| if (sessionWindow.getEndTime() < currentTime) { |
| sessionWindow.setEndTime(currentTime); |
| } |
| previousTimeValue = currentTime; |
| } |
| |
| // we can create a new window beginning at index i of inputTsBlock |
| if (i < size) { |
| needSkip = false; |
| } |
| return inputTsBlock.subTsBlock(i); |
| } |
| |
| @Override |
| public boolean satisfiedCurWindow(TsBlock inputTsBlock) { |
| return true; |
| } |
| |
| @Override |
| public boolean isTsBlockOutOfBound(TsBlock inputTsBlock) { |
| return false; |
| } |
| |
| @Override |
| public TsBlockBuilder createResultTsBlockBuilder(List<Aggregator> aggregators) { |
| List<TSDataType> dataTypes = getResultDataTypes(aggregators); |
| // Judge whether we need output endTime column. |
| if (isNeedOutputEndTime) { |
| dataTypes.add(0, TSDataType.INT64); |
| } |
| return new TsBlockBuilder(dataTypes); |
| } |
| |
| @Override |
| public void appendAggregationResult( |
| TsBlockBuilder resultTsBlockBuilder, List<Aggregator> aggregators) { |
| long endTime = isNeedOutputEndTime ? sessionWindow.getEndTime() : -1; |
| outputAggregators(aggregators, resultTsBlockBuilder, sessionWindow.getStartTime(), endTime); |
| } |
| |
| @Override |
| public boolean needSkipInAdvance() { |
| return isNeedOutputEndTime; |
| } |
| |
| @Override |
| public boolean isIgnoringNull() { |
| return false; |
| } |
| } |