| /* |
| * 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; |
| |
| import org.apache.tsfile.common.conf.TSFileDescriptor; |
| import org.apache.tsfile.read.common.block.TsBlock; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| public abstract class AbstractOperator implements Operator { |
| |
| private static final Logger LOGGER = LoggerFactory.getLogger(AbstractOperator.class); |
| protected OperatorContext operatorContext; |
| |
| protected long maxReturnSize = |
| TSFileDescriptor.getInstance().getConfig().getMaxTsBlockSizeInBytes(); |
| protected int maxTupleSizeOfTsBlock = -1; |
| protected TsBlock resultTsBlock; |
| protected TsBlock retainedTsBlock; |
| protected int startOffset = 0; |
| |
| public void initializeMaxTsBlockLength(TsBlock tsBlock) { |
| if (maxTupleSizeOfTsBlock != -1) { |
| return; |
| } |
| long oneTupleSize = |
| (tsBlock.getRetainedSizeInBytes() - tsBlock.getTotalInstanceSize()) |
| / tsBlock.getPositionCount(); |
| if (oneTupleSize > maxReturnSize) { |
| // make sure at least one-tuple-at-a-time |
| this.maxTupleSizeOfTsBlock = 1; |
| LOGGER.warn("Only one tuple can be sent each time caused by limited memory"); |
| } else { |
| this.maxTupleSizeOfTsBlock = (int) (maxReturnSize / oneTupleSize); |
| } |
| if (LOGGER.isDebugEnabled()) { |
| LOGGER.debug("maxTupleSizeOfTsBlock is:{}", maxTupleSizeOfTsBlock); |
| } |
| } |
| |
| public TsBlock checkTsBlockSizeAndGetResult() { |
| if (resultTsBlock == null) { |
| throw new IllegalArgumentException("Result tsBlock cannot be null"); |
| } |
| if (maxTupleSizeOfTsBlock == -1) { |
| initializeMaxTsBlockLength(resultTsBlock); |
| } |
| |
| if (resultTsBlock.getPositionCount() <= maxTupleSizeOfTsBlock) { |
| TsBlock res = resultTsBlock; |
| resultTsBlock = null; |
| return res; |
| } else { |
| retainedTsBlock = resultTsBlock; |
| resultTsBlock = null; |
| return getResultFromRetainedTsBlock(); |
| } |
| } |
| |
| public TsBlock getResultFromRetainedTsBlock() { |
| TsBlock res; |
| if (maxTupleSizeOfTsBlock == -1) { |
| initializeMaxTsBlockLength(retainedTsBlock); |
| } |
| if (retainedTsBlock.getPositionCount() - startOffset <= maxTupleSizeOfTsBlock) { |
| res = retainedTsBlock.subTsBlock(startOffset); |
| retainedTsBlock = null; |
| startOffset = 0; |
| } else { |
| res = retainedTsBlock.getRegion(startOffset, maxTupleSizeOfTsBlock); |
| startOffset += maxTupleSizeOfTsBlock; |
| } |
| if (LOGGER.isDebugEnabled()) { |
| LOGGER.debug("Current tsBlock size is : {}", res.getRetainedSizeInBytes()); |
| } |
| return res; |
| } |
| |
| @Override |
| public OperatorContext getOperatorContext() { |
| return operatorContext; |
| } |
| } |