| /* |
| * 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.process; |
| |
| import org.apache.iotdb.db.queryengine.execution.aggregation.Aggregator; |
| import org.apache.iotdb.db.queryengine.execution.operator.Operator; |
| import org.apache.iotdb.db.queryengine.execution.operator.OperatorContext; |
| |
| import com.google.common.util.concurrent.ListenableFuture; |
| import org.apache.tsfile.read.common.block.TsBlock; |
| import org.apache.tsfile.read.common.block.TsBlockBuilder; |
| |
| import java.util.List; |
| import java.util.concurrent.TimeUnit; |
| |
| public abstract class SingleInputAggregationOperator implements ProcessOperator { |
| |
| protected final OperatorContext operatorContext; |
| protected final boolean ascending; |
| |
| protected final Operator child; |
| protected TsBlock inputTsBlock; |
| protected boolean canCallNext; |
| |
| protected final List<Aggregator> aggregators; |
| |
| // using for building result tsBlock |
| protected TsBlockBuilder resultTsBlockBuilder; |
| |
| protected final long maxRetainedSize; |
| protected final long maxReturnSize; |
| |
| protected SingleInputAggregationOperator( |
| OperatorContext operatorContext, |
| List<Aggregator> aggregators, |
| Operator child, |
| boolean ascending, |
| long maxReturnSize) { |
| this.operatorContext = operatorContext; |
| this.ascending = ascending; |
| this.child = child; |
| this.aggregators = aggregators; |
| this.maxRetainedSize = child.calculateMaxReturnSize(); |
| this.maxReturnSize = maxReturnSize; |
| } |
| |
| @Override |
| public OperatorContext getOperatorContext() { |
| return operatorContext; |
| } |
| |
| @Override |
| public ListenableFuture<?> isBlocked() { |
| return child.isBlocked(); |
| } |
| |
| @Override |
| public TsBlock next() throws Exception { |
| // start stopwatch |
| long maxRuntime = operatorContext.getMaxRunTime().roundTo(TimeUnit.NANOSECONDS); |
| long start = System.nanoTime(); |
| |
| // reset operator state |
| canCallNext = true; |
| |
| while (System.nanoTime() - start < maxRuntime && hasNext() && !resultTsBlockBuilder.isFull()) { |
| // calculate aggregation result on current time window |
| if (!calculateNextAggregationResult()) { |
| break; |
| } |
| } |
| |
| if (resultTsBlockBuilder.getPositionCount() > 0) { |
| TsBlock resultTsBlock = resultTsBlockBuilder.build(); |
| resultTsBlockBuilder.reset(); |
| return resultTsBlock; |
| } else { |
| return null; |
| } |
| } |
| |
| @Override |
| public boolean isFinished() throws Exception { |
| return !this.hasNextWithTimer(); |
| } |
| |
| @Override |
| public void close() throws Exception { |
| child.close(); |
| } |
| |
| @SuppressWarnings("squid:S112") |
| protected abstract boolean calculateNextAggregationResult() throws Exception; |
| |
| protected abstract void updateResultTsBlock(); |
| |
| @Override |
| public long calculateMaxPeekMemory() { |
| return maxReturnSize + maxRetainedSize + child.calculateRetainedSizeAfterCallingNext(); |
| } |
| |
| @Override |
| public long calculateMaxReturnSize() { |
| return maxReturnSize; |
| } |
| |
| @Override |
| public long calculateRetainedSizeAfterCallingNext() { |
| return maxRetainedSize + child.calculateRetainedSizeAfterCallingNext(); |
| } |
| } |