| /* |
| * 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.mpp.execution.operator.process; |
| |
| import org.apache.iotdb.db.mpp.aggregation.Aggregator; |
| import org.apache.iotdb.db.mpp.aggregation.timerangeiterator.ITimeRangeIterator; |
| import org.apache.iotdb.db.mpp.execution.operator.Operator; |
| import org.apache.iotdb.db.mpp.execution.operator.OperatorContext; |
| import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType; |
| import org.apache.iotdb.tsfile.read.common.TimeRange; |
| import org.apache.iotdb.tsfile.read.common.block.TsBlock; |
| import org.apache.iotdb.tsfile.read.common.block.TsBlockBuilder; |
| |
| import com.google.common.util.concurrent.ListenableFuture; |
| |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.List; |
| import java.util.concurrent.TimeUnit; |
| |
| import static com.google.common.util.concurrent.Futures.successfulAsList; |
| import static org.apache.iotdb.db.mpp.execution.operator.AggregationUtil.appendAggregationResult; |
| |
| /** |
| * AggregationOperator can process the situation: aggregation of intermediate aggregate result, it |
| * will output one tsBlock contain many results on aggregation time intervals. One intermediate |
| * tsBlock input will contain the result of many time intervals. |
| */ |
| public class AggregationOperator implements ProcessOperator { |
| |
| private final OperatorContext operatorContext; |
| |
| private final List<Operator> children; |
| private final int inputOperatorsCount; |
| private final TsBlock[] inputTsBlocks; |
| private final boolean[] canCallNext; |
| |
| private final ITimeRangeIterator timeRangeIterator; |
| // current interval of aggregation window [curStartTime, curEndTime) |
| private TimeRange curTimeRange; |
| |
| private final List<Aggregator> aggregators; |
| |
| // using for building result tsBlock |
| private final TsBlockBuilder resultTsBlockBuilder; |
| |
| private final long maxRetainedSize; |
| private final long childrenRetainedSize; |
| private final long maxReturnSize; |
| |
| public AggregationOperator( |
| OperatorContext operatorContext, |
| List<Aggregator> aggregators, |
| ITimeRangeIterator timeRangeIterator, |
| List<Operator> children, |
| long maxReturnSize) { |
| this.operatorContext = operatorContext; |
| this.children = children; |
| this.aggregators = aggregators; |
| this.timeRangeIterator = timeRangeIterator; |
| |
| this.inputOperatorsCount = children.size(); |
| this.inputTsBlocks = new TsBlock[inputOperatorsCount]; |
| this.canCallNext = new boolean[inputOperatorsCount]; |
| for (int i = 0; i < inputOperatorsCount; i++) { |
| canCallNext[i] = false; |
| } |
| |
| List<TSDataType> dataTypes = new ArrayList<>(); |
| for (Aggregator aggregator : aggregators) { |
| dataTypes.addAll(Arrays.asList(aggregator.getOutputType())); |
| } |
| this.resultTsBlockBuilder = new TsBlockBuilder(dataTypes); |
| |
| this.maxRetainedSize = children.stream().mapToLong(Operator::calculateMaxReturnSize).sum(); |
| this.childrenRetainedSize = |
| children.stream().mapToLong(Operator::calculateRetainedSizeAfterCallingNext).sum(); |
| this.maxReturnSize = maxReturnSize; |
| } |
| |
| @Override |
| public OperatorContext getOperatorContext() { |
| return operatorContext; |
| } |
| |
| @Override |
| public long calculateMaxPeekMemory() { |
| return maxReturnSize + maxRetainedSize + childrenRetainedSize; |
| } |
| |
| @Override |
| public long calculateMaxReturnSize() { |
| return maxReturnSize; |
| } |
| |
| @Override |
| public long calculateRetainedSizeAfterCallingNext() { |
| return maxRetainedSize + childrenRetainedSize; |
| } |
| |
| @Override |
| public ListenableFuture<?> isBlocked() { |
| List<ListenableFuture<?>> listenableFutures = new ArrayList<>(); |
| for (int i = 0; i < inputOperatorsCount; i++) { |
| ListenableFuture<?> blocked = children.get(i).isBlocked(); |
| if (blocked.isDone()) { |
| canCallNext[i] = true; |
| } else { |
| if (isEmpty(i)) { |
| listenableFutures.add(blocked); |
| canCallNext[i] = true; |
| } |
| } |
| } |
| return listenableFutures.isEmpty() ? NOT_BLOCKED : successfulAsList(listenableFutures); |
| } |
| |
| @Override |
| public boolean hasNext() { |
| return curTimeRange != null || timeRangeIterator.hasNextTimeRange(); |
| } |
| |
| @Override |
| public TsBlock next() { |
| // start stopwatch |
| long maxRuntime = operatorContext.getMaxRunTime().roundTo(TimeUnit.NANOSECONDS); |
| long start = System.nanoTime(); |
| |
| while (System.nanoTime() - start < maxRuntime |
| && (curTimeRange != null || timeRangeIterator.hasNextTimeRange()) |
| && !resultTsBlockBuilder.isFull()) { |
| boolean hasCachedData = prepareInput(); |
| if (!hasCachedData) { |
| break; |
| } |
| |
| if (curTimeRange == null && timeRangeIterator.hasNextTimeRange()) { |
| // move to next time window |
| curTimeRange = timeRangeIterator.nextTimeRange(); |
| |
| // clear previous aggregation result |
| for (Aggregator aggregator : aggregators) { |
| aggregator.updateTimeRange(curTimeRange); |
| } |
| } |
| |
| // calculate aggregation result on current time window |
| calculateNextAggregationResult(); |
| } |
| |
| if (resultTsBlockBuilder.getPositionCount() > 0) { |
| TsBlock resultTsBlock = resultTsBlockBuilder.build(); |
| resultTsBlockBuilder.reset(); |
| return resultTsBlock; |
| } else { |
| return null; |
| } |
| } |
| |
| @Override |
| public boolean isFinished() { |
| return !this.hasNext(); |
| } |
| |
| @Override |
| public void close() throws Exception { |
| for (Operator child : children) { |
| child.close(); |
| } |
| } |
| |
| private boolean prepareInput() { |
| for (int i = 0; i < inputOperatorsCount; i++) { |
| if (inputTsBlocks[i] != null) { |
| continue; |
| } |
| if (!canCallNext[i]) { |
| return false; |
| } |
| |
| inputTsBlocks[i] = children.get(i).next(); |
| canCallNext[i] = false; |
| if (inputTsBlocks[i] == null) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| private void calculateNextAggregationResult() { |
| // consume current input tsBlocks |
| for (Aggregator aggregator : aggregators) { |
| aggregator.processTsBlocks(inputTsBlocks); |
| } |
| |
| for (int i = 0; i < inputOperatorsCount; i++) { |
| inputTsBlocks[i] = inputTsBlocks[i].skipFirst(); |
| if (inputTsBlocks[i].isEmpty()) { |
| inputTsBlocks[i] = null; |
| } |
| } |
| |
| // update result using aggregators |
| updateResultTsBlock(); |
| } |
| |
| private void updateResultTsBlock() { |
| curTimeRange = null; |
| appendAggregationResult( |
| resultTsBlockBuilder, aggregators, timeRangeIterator.currentOutputTime()); |
| } |
| |
| private boolean isEmpty(int index) { |
| return inputTsBlocks[index] == null || inputTsBlocks[index].isEmpty(); |
| } |
| } |