| /* |
| * 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.schema; |
| |
| 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 org.apache.iotdb.tsfile.read.common.block.TsBlock; |
| import org.apache.iotdb.tsfile.read.common.block.column.BinaryColumn; |
| import org.apache.iotdb.tsfile.read.common.block.column.TimeColumn; |
| import org.apache.iotdb.tsfile.utils.Binary; |
| import org.apache.iotdb.tsfile.utils.ReadWriteIOUtils; |
| |
| import com.google.common.util.concurrent.ListenableFuture; |
| |
| import java.io.ByteArrayOutputStream; |
| import java.io.IOException; |
| import java.util.List; |
| import java.util.Optional; |
| |
| public class SchemaFetchMergeOperator implements ProcessOperator { |
| |
| private final OperatorContext operatorContext; |
| private final List<Operator> children; |
| private final int childrenCount; |
| |
| private int currentIndex; |
| |
| private boolean isReadingStorageGroupInfo; |
| |
| private final List<String> storageGroupList; |
| |
| public SchemaFetchMergeOperator( |
| OperatorContext operatorContext, List<Operator> children, List<String> storageGroupList) { |
| this.operatorContext = operatorContext; |
| this.children = children; |
| this.childrenCount = children.size(); |
| |
| this.currentIndex = 0; |
| |
| this.isReadingStorageGroupInfo = true; |
| |
| this.storageGroupList = storageGroupList; |
| } |
| |
| @Override |
| public OperatorContext getOperatorContext() { |
| return operatorContext; |
| } |
| |
| @Override |
| public TsBlock next() throws Exception { |
| if (isReadingStorageGroupInfo) { |
| isReadingStorageGroupInfo = false; |
| return generateStorageGroupInfo(); |
| } |
| |
| if (children.get(currentIndex).hasNextWithTimer()) { |
| return children.get(currentIndex).nextWithTimer(); |
| } else { |
| currentIndex++; |
| return null; |
| } |
| } |
| |
| @Override |
| public boolean hasNext() throws Exception { |
| return isReadingStorageGroupInfo || currentIndex < childrenCount; |
| } |
| |
| @Override |
| public ListenableFuture<?> isBlocked() { |
| return isReadingStorageGroupInfo || currentIndex >= children.size() |
| ? NOT_BLOCKED |
| : children.get(currentIndex).isBlocked(); |
| } |
| |
| @Override |
| public boolean isFinished() throws Exception { |
| return !hasNextWithTimer(); |
| } |
| |
| @Override |
| public void close() throws Exception { |
| for (Operator child : children) { |
| child.close(); |
| } |
| } |
| |
| private TsBlock generateStorageGroupInfo() { |
| ByteArrayOutputStream outputStream = new ByteArrayOutputStream(); |
| try { |
| // to indicate this binary data is database info |
| ReadWriteIOUtils.write((byte) 0, outputStream); |
| |
| ReadWriteIOUtils.write(storageGroupList.size(), outputStream); |
| for (String storageGroup : storageGroupList) { |
| ReadWriteIOUtils.write(storageGroup, outputStream); |
| } |
| } catch (IOException e) { |
| // Totally memory operation. This case won't happen. |
| } |
| return new TsBlock( |
| new TimeColumn(1, new long[] {0}), |
| new BinaryColumn( |
| 1, Optional.empty(), new Binary[] {new Binary(outputStream.toByteArray())})); |
| } |
| |
| @Override |
| public long calculateMaxPeekMemory() { |
| long childrenMaxPeekMemory = 0; |
| for (Operator child : children) { |
| childrenMaxPeekMemory = Math.max(childrenMaxPeekMemory, child.calculateMaxPeekMemory()); |
| } |
| |
| return childrenMaxPeekMemory; |
| } |
| |
| @Override |
| public long calculateMaxReturnSize() { |
| long childrenMaxReturnSize = 0; |
| for (Operator child : children) { |
| childrenMaxReturnSize = Math.max(childrenMaxReturnSize, child.calculateMaxReturnSize()); |
| } |
| |
| return childrenMaxReturnSize; |
| } |
| |
| @Override |
| public long calculateRetainedSizeAfterCallingNext() { |
| long retainedSize = 0L; |
| for (Operator child : children) { |
| retainedSize += child.calculateRetainedSizeAfterCallingNext(); |
| } |
| return retainedSize; |
| } |
| } |