| /* |
| * 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.last; |
| |
| import org.apache.iotdb.db.queryengine.execution.operator.Operator; |
| import org.apache.iotdb.db.queryengine.execution.operator.OperatorContext; |
| import org.apache.iotdb.db.queryengine.execution.operator.process.ProcessOperator; |
| |
| import com.google.common.util.concurrent.Futures; |
| import com.google.common.util.concurrent.ListenableFuture; |
| import org.apache.tsfile.common.conf.TSFileDescriptor; |
| import org.apache.tsfile.read.common.block.TsBlock; |
| import org.apache.tsfile.read.common.block.TsBlockBuilder; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.concurrent.TimeUnit; |
| |
| import static com.google.common.util.concurrent.Futures.successfulAsList; |
| |
| // collect all last query result in the same data region and there is no order guarantee |
| public class LastQueryOperator implements ProcessOperator { |
| |
| private static final int MAX_DETECT_COUNT = |
| TSFileDescriptor.getInstance().getConfig().getMaxTsBlockLineNumber(); |
| |
| private static final int DEFAULT_MAX_TSBLOCK_SIZE_IN_BYTES = |
| TSFileDescriptor.getInstance().getConfig().getMaxTsBlockSizeInBytes(); |
| |
| private final OperatorContext operatorContext; |
| |
| private final List<Operator> children; |
| |
| private final int inputOperatorsCount; |
| |
| private int currentIndex; |
| |
| private TsBlockBuilder tsBlockBuilder; |
| |
| public LastQueryOperator( |
| OperatorContext operatorContext, List<Operator> children, TsBlockBuilder builder) { |
| this.operatorContext = operatorContext; |
| this.children = children; |
| this.inputOperatorsCount = children.size(); |
| this.currentIndex = 0; |
| this.tsBlockBuilder = builder; |
| } |
| |
| @Override |
| public OperatorContext getOperatorContext() { |
| return operatorContext; |
| } |
| |
| @Override |
| public ListenableFuture<?> isBlocked() { |
| if (currentIndex < inputOperatorsCount) { |
| int endIndex = getEndIndex(); |
| List<ListenableFuture<?>> listenableFutures = new ArrayList<>(); |
| for (int i = currentIndex; i < endIndex; i++) { |
| ListenableFuture<?> blocked = children.get(i).isBlocked(); |
| if (!blocked.isDone()) { |
| listenableFutures.add(blocked); |
| } |
| } |
| return listenableFutures.isEmpty() ? NOT_BLOCKED : successfulAsList(listenableFutures); |
| } else { |
| return Futures.immediateVoidFuture(); |
| } |
| } |
| |
| @Override |
| public TsBlock next() throws Exception { |
| |
| // we have consumed up data from children Operator, just return all remaining cached data in |
| // tsBlockBuilder |
| if (currentIndex >= inputOperatorsCount) { |
| TsBlock res = tsBlockBuilder.build(); |
| tsBlockBuilder.reset(); |
| return res; |
| } |
| |
| // start stopwatch |
| long maxRuntime = operatorContext.getMaxRunTime().roundTo(TimeUnit.NANOSECONDS); |
| long start = System.nanoTime(); |
| |
| int endIndex = getEndIndex(); |
| |
| while ((System.nanoTime() - start < maxRuntime) |
| && (currentIndex < endIndex) |
| && !tsBlockBuilder.isFull()) { |
| if (children.get(currentIndex).hasNextWithTimer()) { |
| TsBlock tsBlock = children.get(currentIndex).nextWithTimer(); |
| if (tsBlock == null) { |
| return null; |
| } else if (!tsBlock.isEmpty()) { |
| LastQueryUtil.appendLastValue(tsBlockBuilder, tsBlock); |
| } |
| } else { |
| children.get(currentIndex).close(); |
| children.set(currentIndex, null); |
| } |
| |
| currentIndex++; |
| } |
| |
| TsBlock res = tsBlockBuilder.build(); |
| tsBlockBuilder.reset(); |
| return res; |
| } |
| |
| @Override |
| public boolean hasNext() throws Exception { |
| return currentIndex < inputOperatorsCount || !tsBlockBuilder.isEmpty(); |
| } |
| |
| @Override |
| public boolean isFinished() throws Exception { |
| return !hasNextWithTimer(); |
| } |
| |
| @Override |
| public void close() throws Exception { |
| for (Operator child : children) { |
| if (child != null) { |
| child.close(); |
| } |
| } |
| tsBlockBuilder = null; |
| } |
| |
| private int getEndIndex() { |
| return currentIndex + Math.min(MAX_DETECT_COUNT, inputOperatorsCount - currentIndex); |
| } |
| |
| @Override |
| public long calculateMaxPeekMemory() { |
| long maxPeekMemory = |
| Math.max(DEFAULT_MAX_TSBLOCK_SIZE_IN_BYTES, tsBlockBuilder.getRetainedSizeInBytes()); |
| long res = 0; |
| for (Operator child : children) { |
| res = Math.max(res, maxPeekMemory + child.calculateMaxPeekMemory()); |
| } |
| return res; |
| } |
| |
| @Override |
| public long calculateMaxReturnSize() { |
| return Math.max(DEFAULT_MAX_TSBLOCK_SIZE_IN_BYTES, tsBlockBuilder.getRetainedSizeInBytes()); |
| } |
| |
| @Override |
| public long calculateRetainedSizeAfterCallingNext() { |
| long max = 0; |
| for (Operator operator : children) { |
| max = Math.max(max, operator.calculateRetainedSizeAfterCallingNext()); |
| } |
| return max; |
| } |
| } |