| /* |
| * 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.metadata.template; |
| |
| import org.apache.iotdb.db.exception.metadata.DuplicatedTemplateException; |
| import org.apache.iotdb.db.exception.metadata.MetadataException; |
| import org.apache.iotdb.db.exception.metadata.PathAlreadyExistException; |
| import org.apache.iotdb.db.exception.metadata.UndefinedTemplateException; |
| import org.apache.iotdb.db.metadata.mnode.IMNode; |
| import org.apache.iotdb.db.qp.physical.crud.CreateTemplatePlan; |
| import org.apache.iotdb.db.utils.TestOnly; |
| import org.apache.iotdb.tsfile.utils.Pair; |
| import org.apache.iotdb.tsfile.write.schema.IMeasurementSchema; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| import java.util.concurrent.ConcurrentHashMap; |
| |
| public class TemplateManager { |
| |
| // template name -> template |
| private Map<String, Template> templateMap = new ConcurrentHashMap<>(); |
| |
| private static class TemplateManagerHolder { |
| |
| private TemplateManagerHolder() { |
| // allowed to do nothing |
| } |
| |
| private static final TemplateManager INSTANCE = new TemplateManager(); |
| } |
| |
| public static TemplateManager getInstance() { |
| return TemplateManagerHolder.INSTANCE; |
| } |
| |
| @TestOnly |
| public static TemplateManager getNewInstanceForTest() { |
| return new TemplateManager(); |
| } |
| |
| private TemplateManager() {} |
| |
| public void createSchemaTemplate(CreateTemplatePlan plan) throws MetadataException { |
| Template template = new Template(plan); |
| if (templateMap.putIfAbsent(plan.getName(), template) != null) { |
| // already have template |
| throw new MetadataException("Duplicated template name: " + plan.getName()); |
| } |
| } |
| |
| public Template getTemplate(String templateName) throws UndefinedTemplateException { |
| Template template = templateMap.get(templateName); |
| if (template == null) { |
| throw new UndefinedTemplateException(templateName); |
| } |
| return template; |
| } |
| |
| public void setSchemaTemplate(Template template, Pair<IMNode, Template> node) |
| throws MetadataException { |
| |
| if (node.left.getSchemaTemplate() != null) { |
| if (node.left.getSchemaTemplate().equals(template)) { |
| throw new DuplicatedTemplateException(template.getName()); |
| } else { |
| throw new MetadataException("Specified node already has template"); |
| } |
| } |
| |
| if (!isTemplateCompatible(node.right, template)) { |
| throw new MetadataException("Incompatible template"); |
| } |
| |
| checkIsTemplateAndMNodeCompatible(template, node.left); |
| |
| node.left.setSchemaTemplate(template); |
| } |
| |
| public boolean isTemplateCompatible(Template upper, Template current) { |
| if (upper == null) { |
| return true; |
| } |
| |
| Map<String, IMeasurementSchema> upperMap = new HashMap<>(upper.getSchemaMap()); |
| Map<String, IMeasurementSchema> currentMap = new HashMap<>(current.getSchemaMap()); |
| |
| // for identical vector schema, we should just compare once |
| Map<IMeasurementSchema, IMeasurementSchema> sameSchema = new HashMap<>(); |
| |
| for (String name : currentMap.keySet()) { |
| IMeasurementSchema upperSchema = upperMap.remove(name); |
| if (upperSchema != null) { |
| IMeasurementSchema currentSchema = currentMap.get(name); |
| // use "==" to compare actual address space |
| if (upperSchema == sameSchema.get(currentSchema)) { |
| continue; |
| } |
| |
| if (!upperSchema.equals(currentSchema)) { |
| return false; |
| } |
| |
| sameSchema.put(currentSchema, upperSchema); |
| } |
| } |
| |
| // current template must contains all measurements of upper template |
| return upperMap.isEmpty(); |
| } |
| |
| public void checkIsTemplateAndMNodeCompatible(Template template, IMNode IMNode) |
| throws PathAlreadyExistException { |
| for (String schemaName : template.getSchemaMap().keySet()) { |
| if (IMNode.hasChild(schemaName)) { |
| throw new PathAlreadyExistException( |
| IMNode.getPartialPath().concatNode(schemaName).getFullPath()); |
| } |
| } |
| } |
| |
| public void clear() { |
| templateMap.clear(); |
| } |
| } |