cps-ri/src/main/java/org/onap/cps/spi/impl/CpsDataPersistenceServiceImpl.java

   1 /*
   2  *  ============LICENSE_START=======================================================
   3  *  Copyright (C) 2021-2022 Nordix Foundation
   4  *  Modifications Copyright (C) 2021 Pantheon.tech
   5  *  Modifications Copyright (C) 2020-2022 Bell Canada.
   6  *  ================================================================================
   7  *  Licensed under the Apache License, Version 2.0 (the "License");
   8  *  you may not use this file except in compliance with the License.
   9  *  You may obtain a copy of the License at
  10  *
  11  *        http://www.apache.org/licenses/LICENSE-2.0
  12  *
  13  *  Unless required by applicable law or agreed to in writing, software
  14  *  distributed under the License is distributed on an "AS IS" BASIS,
  15  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  16  *  See the License for the specific language governing permissions and
  17  *  limitations under the License.
  18  *
  19  *  SPDX-License-Identifier: Apache-2.0
  20  *  ============LICENSE_END=========================================================
  21  */
  22
  23 package org.onap.cps.spi.impl;
  24
  25 import static org.onap.cps.spi.FetchDescendantsOption.INCLUDE_ALL_DESCENDANTS;
  26
  27 import com.google.common.collect.ImmutableSet;
  28 import com.google.common.collect.ImmutableSet.Builder;
  29 import java.util.Collection;
  30 import java.util.Collections;
  31 import java.util.HashMap;
  32 import java.util.HashSet;
  33 import java.util.List;
  34 import java.util.Map;
  35 import java.util.Set;
  36 import java.util.regex.Matcher;
  37 import java.util.regex.Pattern;
  38 import java.util.stream.Collectors;
  39 import javax.transaction.Transactional;
  40 import lombok.RequiredArgsConstructor;
  41 import lombok.extern.slf4j.Slf4j;
  42 import org.hibernate.StaleStateException;
  43 import org.onap.cps.cpspath.parser.CpsPathQuery;
  44 import org.onap.cps.spi.CpsDataPersistenceService;
  45 import org.onap.cps.spi.FetchDescendantsOption;
  46 import org.onap.cps.spi.entities.AnchorEntity;
  47 import org.onap.cps.spi.entities.DataspaceEntity;
  48 import org.onap.cps.spi.entities.FragmentEntity;
  49 import org.onap.cps.spi.exceptions.AlreadyDefinedException;
  50 import org.onap.cps.spi.exceptions.ConcurrencyException;
  51 import org.onap.cps.spi.exceptions.CpsAdminException;
  52 import org.onap.cps.spi.exceptions.CpsPathException;
  53 import org.onap.cps.spi.exceptions.DataNodeNotFoundException;
  54 import org.onap.cps.spi.model.DataNode;
  55 import org.onap.cps.spi.model.DataNodeBuilder;
  56 import org.onap.cps.spi.repository.AnchorRepository;
  57 import org.onap.cps.spi.repository.DataspaceRepository;
  58 import org.onap.cps.spi.repository.FragmentRepository;
  59 import org.onap.cps.utils.JsonObjectMapper;
  60 import org.springframework.dao.DataIntegrityViolationException;
  61 import org.springframework.stereotype.Service;
  62
  63 @Service
  64 @Slf4j
  65 @RequiredArgsConstructor
  66 public class CpsDataPersistenceServiceImpl implements CpsDataPersistenceService {
  67
  68     private final DataspaceRepository dataspaceRepository;
  69
  70     private final AnchorRepository anchorRepository;
  71
  72     private final FragmentRepository fragmentRepository;
  73
  74     private final JsonObjectMapper jsonObjectMapper;
  75
  76     private static final String REG_EX_FOR_OPTIONAL_LIST_INDEX = "(\\[@[\\s\\S]+?]){0,1})";
  77     private static final Pattern REG_EX_PATTERN_FOR_LIST_ELEMENT_KEY_PREDICATE =
  78             Pattern.compile("\\[(\\@([^\\/]{0,9999}))\\]$");
  79
  80     @Override
  81     @Transactional
  82     public void addChildDataNode(final String dataspaceName, final String anchorName, final String parentNodeXpath,
  83         final DataNode newChildDataNode) {
  84         addChildDataNodes(dataspaceName, anchorName, parentNodeXpath,  Collections.singleton(newChildDataNode));
  85     }
  86
  87     @Override
  88     @Transactional
  89     public void addListElements(final String dataspaceName, final String anchorName, final String parentNodeXpath,
  90         final Collection<DataNode> newListElements) {
  91         addChildDataNodes(dataspaceName, anchorName, parentNodeXpath, newListElements);
  92     }
  93
  94     private void addChildDataNodes(final String dataspaceName, final String anchorName, final String parentNodeXpath,
  95                                 final Collection<DataNode> newChildren) {
  96         final FragmentEntity parentFragmentEntity = getFragmentByXpath(dataspaceName, anchorName, parentNodeXpath);
  97         try {
  98             for (final DataNode newChildAsDataNode : newChildren) {
  99                 final FragmentEntity newChildAsFragmentEntity = convertToFragmentWithAllDescendants(
 100                     parentFragmentEntity.getDataspace(),
 101                     parentFragmentEntity.getAnchor(),
 102                     newChildAsDataNode);
 103                 newChildAsFragmentEntity.setParentId(parentFragmentEntity.getId());
 104                 fragmentRepository.save(newChildAsFragmentEntity);
 105             }
 106         } catch (final DataIntegrityViolationException exception) {
 107             final List<String> conflictXpaths = newChildren.stream()
 108                 .map(DataNode::getXpath)
 109                 .collect(Collectors.toList());
 110             throw AlreadyDefinedException.forDataNodes(conflictXpaths, anchorName, exception);
 111         }
 112     }
 113
 114     @Override
 115     public void storeDataNode(final String dataspaceName, final String anchorName, final DataNode dataNode) {
 116         final DataspaceEntity dataspaceEntity = dataspaceRepository.getByName(dataspaceName);
 117         final AnchorEntity anchorEntity = anchorRepository.getByDataspaceAndName(dataspaceEntity, anchorName);
 118         final FragmentEntity fragmentEntity = convertToFragmentWithAllDescendants(dataspaceEntity, anchorEntity,
 119             dataNode);
 120         try {
 121             fragmentRepository.save(fragmentEntity);
 122         } catch (final DataIntegrityViolationException exception) {
 123             throw AlreadyDefinedException.forDataNode(dataNode.getXpath(), anchorName, exception);
 124         }
 125     }
 126
 127     /**
 128      * Convert DataNode object into Fragment and places the result in the fragments placeholder. Performs same action
 129      * for all DataNode children recursively.
 130      *
 131      * @param dataspaceEntity       dataspace
 132      * @param anchorEntity          anchorEntity
 133      * @param dataNodeToBeConverted dataNode
 134      * @return a Fragment built from current DataNode
 135      */
 136     private FragmentEntity convertToFragmentWithAllDescendants(final DataspaceEntity dataspaceEntity,
 137         final AnchorEntity anchorEntity, final DataNode dataNodeToBeConverted) {
 138         final FragmentEntity parentFragment = toFragmentEntity(dataspaceEntity, anchorEntity, dataNodeToBeConverted);
 139         final Builder<FragmentEntity> childFragmentsImmutableSetBuilder = ImmutableSet.builder();
 140         for (final DataNode childDataNode : dataNodeToBeConverted.getChildDataNodes()) {
 141             final FragmentEntity childFragment =
 142                 convertToFragmentWithAllDescendants(parentFragment.getDataspace(), parentFragment.getAnchor(),
 143                     childDataNode);
 144             childFragmentsImmutableSetBuilder.add(childFragment);
 145         }
 146         parentFragment.setChildFragments(childFragmentsImmutableSetBuilder.build());
 147         return parentFragment;
 148     }
 149
 150     private FragmentEntity toFragmentEntity(final DataspaceEntity dataspaceEntity,
 151         final AnchorEntity anchorEntity, final DataNode dataNode) {
 152         return FragmentEntity.builder()
 153             .dataspace(dataspaceEntity)
 154             .anchor(anchorEntity)
 155             .xpath(dataNode.getXpath())
 156             .attributes(jsonObjectMapper.asJsonString(dataNode.getLeaves()))
 157             .build();
 158     }
 159
 160     @Override
 161     public DataNode getDataNode(final String dataspaceName, final String anchorName, final String xpath,
 162         final FetchDescendantsOption fetchDescendantsOption) {
 163         final FragmentEntity fragmentEntity = getFragmentByXpath(dataspaceName, anchorName, xpath);
 164         return toDataNode(fragmentEntity, fetchDescendantsOption);
 165     }
 166
 167     private FragmentEntity getFragmentByXpath(final String dataspaceName, final String anchorName,
 168         final String xpath) {
 169         final DataspaceEntity dataspaceEntity = dataspaceRepository.getByName(dataspaceName);
 170         final AnchorEntity anchorEntity = anchorRepository.getByDataspaceAndName(dataspaceEntity, anchorName);
 171         if (isRootXpath(xpath)) {
 172             return fragmentRepository.findFirstRootByDataspaceAndAnchor(dataspaceEntity, anchorEntity);
 173         } else {
 174             return fragmentRepository.getByDataspaceAndAnchorAndXpath(dataspaceEntity, anchorEntity,
 175                 xpath);
 176         }
 177     }
 178
 179     @Override
 180     public List<DataNode> queryDataNodes(final String dataspaceName, final String anchorName, final String cpsPath,
 181         final FetchDescendantsOption fetchDescendantsOption) {
 182         final DataspaceEntity dataspaceEntity = dataspaceRepository.getByName(dataspaceName);
 183         final AnchorEntity anchorEntity = anchorRepository.getByDataspaceAndName(dataspaceEntity, anchorName);
 184         final CpsPathQuery cpsPathQuery;
 185         try {
 186             cpsPathQuery = CpsPathQuery.createFrom(cpsPath);
 187         } catch (final IllegalStateException e) {
 188             throw new CpsPathException(e.getMessage());
 189         }
 190         List<FragmentEntity> fragmentEntities =
 191             fragmentRepository.findByAnchorAndCpsPath(anchorEntity.getId(), cpsPathQuery);
 192         if (cpsPathQuery.hasAncestorAxis()) {
 193             final Set<String> ancestorXpaths = processAncestorXpath(fragmentEntities, cpsPathQuery);
 194             fragmentEntities = ancestorXpaths.isEmpty()
 195                 ? Collections.emptyList() : fragmentRepository.findAllByAnchorAndXpathIn(anchorEntity, ancestorXpaths);
 196         }
 197         return fragmentEntities.stream()
 198             .map(fragmentEntity -> toDataNode(fragmentEntity, fetchDescendantsOption))
 199             .collect(Collectors.toUnmodifiableList());
 200     }
 201
 202     private static Set<String> processAncestorXpath(final List<FragmentEntity> fragmentEntities,
 203         final CpsPathQuery cpsPathQuery) {
 204         final Set<String> ancestorXpath = new HashSet<>();
 205         final Pattern pattern =
 206             Pattern.compile("([\\s\\S]*\\/" + Pattern.quote(cpsPathQuery.getAncestorSchemaNodeIdentifier())
 207                 + REG_EX_FOR_OPTIONAL_LIST_INDEX + "\\/[\\s\\S]*");
 208         for (final FragmentEntity fragmentEntity : fragmentEntities) {
 209             final Matcher matcher = pattern.matcher(fragmentEntity.getXpath());
 210             if (matcher.matches()) {
 211                 ancestorXpath.add(matcher.group(1));
 212             }
 213         }
 214         return ancestorXpath;
 215     }
 216
 217     private DataNode toDataNode(final FragmentEntity fragmentEntity,
 218         final FetchDescendantsOption fetchDescendantsOption) {
 219         final List<DataNode> childDataNodes = getChildDataNodes(fragmentEntity, fetchDescendantsOption);
 220         Map<String, Object> leaves = new HashMap<>();
 221         if (fragmentEntity.getAttributes() != null) {
 222             leaves = jsonObjectMapper.convertJsonString(fragmentEntity.getAttributes(), Map.class);
 223         }
 224         return new DataNodeBuilder()
 225             .withXpath(fragmentEntity.getXpath())
 226             .withLeaves(leaves)
 227             .withChildDataNodes(childDataNodes).build();
 228     }
 229
 230     private List<DataNode> getChildDataNodes(final FragmentEntity fragmentEntity,
 231         final FetchDescendantsOption fetchDescendantsOption) {
 232         if (fetchDescendantsOption == INCLUDE_ALL_DESCENDANTS) {
 233             return fragmentEntity.getChildFragments().stream()
 234                 .map(childFragmentEntity -> toDataNode(childFragmentEntity, fetchDescendantsOption))
 235                 .collect(Collectors.toUnmodifiableList());
 236         }
 237         return Collections.emptyList();
 238     }
 239
 240     @Override
 241     public void updateDataLeaves(final String dataspaceName, final String anchorName, final String xpath,
 242         final Map<String, Object> leaves) {
 243         final FragmentEntity fragmentEntity = getFragmentByXpath(dataspaceName, anchorName, xpath);
 244         fragmentEntity.setAttributes(jsonObjectMapper.asJsonString(leaves));
 245         fragmentRepository.save(fragmentEntity);
 246     }
 247
 248     @Override
 249     public void replaceDataNodeTree(final String dataspaceName, final String anchorName, final DataNode dataNode) {
 250         final FragmentEntity fragmentEntity = getFragmentByXpath(dataspaceName, anchorName, dataNode.getXpath());
 251         replaceDataNodeTree(fragmentEntity, dataNode);
 252         try {
 253             fragmentRepository.save(fragmentEntity);
 254         } catch (final StaleStateException staleStateException) {
 255             throw new ConcurrencyException("Concurrent Transactions",
 256                 String.format("dataspace :'%s', Anchor : '%s' and xpath: '%s' is updated by another transaction.",
 257                     dataspaceName, anchorName, dataNode.getXpath()),
 258                 staleStateException);
 259         }
 260     }
 261
 262     private void replaceDataNodeTree(final FragmentEntity existingFragmentEntity,
 263                                             final DataNode newDataNode) {
 264
 265         existingFragmentEntity.setAttributes(jsonObjectMapper.asJsonString(newDataNode.getLeaves()));
 266
 267         final Map<String, FragmentEntity> existingChildrenByXpath = existingFragmentEntity.getChildFragments()
 268             .stream().collect(Collectors.toMap(FragmentEntity::getXpath, childFragmentEntity -> childFragmentEntity));
 269
 270         final Collection<FragmentEntity> updatedChildFragments = new HashSet<>();
 271
 272         for (final DataNode newDataNodeChild : newDataNode.getChildDataNodes()) {
 273             final FragmentEntity childFragment;
 274             if (isNewDataNode(newDataNodeChild, existingChildrenByXpath)) {
 275                 childFragment = convertToFragmentWithAllDescendants(
 276                     existingFragmentEntity.getDataspace(), existingFragmentEntity.getAnchor(), newDataNodeChild);
 277             } else {
 278                 childFragment = existingChildrenByXpath.get(newDataNodeChild.getXpath());
 279                 replaceDataNodeTree(childFragment, newDataNodeChild);
 280             }
 281             updatedChildFragments.add(childFragment);
 282         }
 283         existingFragmentEntity.getChildFragments().clear();
 284         existingFragmentEntity.getChildFragments().addAll(updatedChildFragments);
 285     }
 286
 287     @Override
 288     @Transactional
 289     public void replaceListContent(final String dataspaceName, final String anchorName, final String parentNodeXpath,
 290                                    final Collection<DataNode> newListElements) {
 291         final FragmentEntity parentEntity = getFragmentByXpath(dataspaceName, anchorName, parentNodeXpath);
 292         final String listElementXpathPrefix = getListElementXpathPrefix(newListElements);
 293         final Map<String, FragmentEntity> existingListElementFragmentEntitiesByXPath =
 294             extractListElementFragmentEntitiesByXPath(parentEntity.getChildFragments(), listElementXpathPrefix);
 295         deleteListElements(parentEntity.getChildFragments(), existingListElementFragmentEntitiesByXPath);
 296         final Set<FragmentEntity> updatedChildFragmentEntities = new HashSet<>();
 297         for (final DataNode newListElement : newListElements) {
 298             final FragmentEntity existingListElementEntity =
 299                 existingListElementFragmentEntitiesByXPath.get(newListElement.getXpath());
 300             final FragmentEntity entityToBeAdded = getFragmentForReplacement(parentEntity, newListElement,
 301                 existingListElementEntity);
 302
 303             updatedChildFragmentEntities.add(entityToBeAdded);
 304         }
 305         parentEntity.getChildFragments().addAll(updatedChildFragmentEntities);
 306         fragmentRepository.save(parentEntity);
 307     }
 308
 309     @Override
 310     @Transactional
 311     public void deleteDataNodes(final String dataspaceName, final String anchorName) {
 312         final DataspaceEntity dataspaceEntity = dataspaceRepository.getByName(dataspaceName);
 313         anchorRepository.findByDataspaceAndName(dataspaceEntity, anchorName)
 314             .ifPresent(
 315                 anchorEntity -> fragmentRepository.deleteByAnchorIn(Set.of(anchorEntity)));
 316     }
 317
 318     @Override
 319     @Transactional
 320     public void deleteListDataNode(final String dataspaceName, final String anchorName,
 321                                    final String targetXpath) {
 322         deleteDataNode(dataspaceName, anchorName, targetXpath, true);
 323     }
 324
 325     @Override
 326     @Transactional
 327     public void deleteDataNode(final String dataspaceName, final String anchorName, final String targetXpath) {
 328         deleteDataNode(dataspaceName, anchorName, targetXpath, false);
 329     }
 330
 331     private void deleteDataNode(final String dataspaceName, final String anchorName, final String targetXpath,
 332                                 final boolean onlySupportListNodeDeletion) {
 333         final String parentNodeXpath = targetXpath.substring(0, targetXpath.lastIndexOf('/'));
 334         final FragmentEntity parentFragmentEntity = getFragmentByXpath(dataspaceName, anchorName, parentNodeXpath);
 335         final String lastXpathElement = targetXpath.substring(targetXpath.lastIndexOf('/'));
 336         final boolean isListElement = REG_EX_PATTERN_FOR_LIST_ELEMENT_KEY_PREDICATE.matcher(lastXpathElement).find();
 337         boolean targetExist;
 338         if (isListElement) {
 339             targetExist = deleteDataNode(parentFragmentEntity, targetXpath);
 340         } else {
 341             targetExist = deleteAllListElements(parentFragmentEntity, targetXpath);
 342             final boolean tryToDeleteDataNode = !targetExist && !onlySupportListNodeDeletion;
 343             if (tryToDeleteDataNode) {
 344                 targetExist = deleteDataNode(parentFragmentEntity, targetXpath);
 345             }
 346         }
 347         if (!targetExist) {
 348             final String additionalInformation = onlySupportListNodeDeletion
 349                 ? "The target is probably not a List." : "";
 350             throw new DataNodeNotFoundException(parentFragmentEntity.getDataspace().getName(),
 351                 parentFragmentEntity.getAnchor().getName(), targetXpath, additionalInformation);
 352         }
 353     }
 354
 355     private boolean deleteDataNode(final FragmentEntity parentFragmentEntity, final String targetXpath) {
 356         if (parentFragmentEntity.getChildFragments()
 357             .removeIf(fragment -> fragment.getXpath().equals(targetXpath))) {
 358             fragmentRepository.save(parentFragmentEntity);
 359             return true;
 360         }
 361         return false;
 362     }
 363
 364
 365     private boolean deleteAllListElements(final FragmentEntity parentFragmentEntity, final String listXpath) {
 366         final String deleteTargetXpathPrefix = listXpath + "[";
 367         if (parentFragmentEntity.getChildFragments()
 368             .removeIf(fragment -> fragment.getXpath().startsWith(deleteTargetXpathPrefix))) {
 369             fragmentRepository.save(parentFragmentEntity);
 370             return true;
 371         }
 372         return false;
 373     }
 374
 375     private static void deleteListElements(
 376         final Collection<FragmentEntity> fragmentEntities,
 377         final Map<String, FragmentEntity> existingListElementFragmentEntitiesByXPath) {
 378         fragmentEntities.removeAll(existingListElementFragmentEntitiesByXPath.values());
 379     }
 380
 381     private static String getListElementXpathPrefix(final Collection<DataNode> newListElements) {
 382         if (newListElements.isEmpty()) {
 383             throw new CpsAdminException("Invalid list replacement",
 384                 "Cannot replace list elements with empty collection");
 385         }
 386         final String firstChildNodeXpath = newListElements.iterator().next().getXpath();
 387         return firstChildNodeXpath.substring(0, firstChildNodeXpath.lastIndexOf("[") + 1);
 388     }
 389
 390     private FragmentEntity getFragmentForReplacement(final FragmentEntity parentEntity,
 391                                                             final DataNode newListElement,
 392                                                             final FragmentEntity existingListElementEntity) {
 393         if (existingListElementEntity == null) {
 394             return convertToFragmentWithAllDescendants(
 395                 parentEntity.getDataspace(), parentEntity.getAnchor(), newListElement);
 396         }
 397         if (newListElement.getChildDataNodes().isEmpty()) {
 398             copyAttributesFromNewListElement(existingListElementEntity, newListElement);
 399             existingListElementEntity.getChildFragments().clear();
 400         } else {
 401             replaceDataNodeTree(existingListElementEntity, newListElement);
 402         }
 403         return existingListElementEntity;
 404     }
 405
 406     private static boolean isNewDataNode(final DataNode replacementDataNode,
 407                                          final Map<String, FragmentEntity> existingListElementsByXpath) {
 408         return !existingListElementsByXpath.containsKey(replacementDataNode.getXpath());
 409     }
 410
 411     private void copyAttributesFromNewListElement(final FragmentEntity existingListElementEntity,
 412                                                          final DataNode newListElement) {
 413         final FragmentEntity replacementFragmentEntity =
 414                 FragmentEntity.builder().attributes(jsonObjectMapper.asJsonString(
 415                         newListElement.getLeaves())).build();
 416         existingListElementEntity.setAttributes(replacementFragmentEntity.getAttributes());
 417     }
 418
 419     private static Map<String, FragmentEntity> extractListElementFragmentEntitiesByXPath(
 420         final Set<FragmentEntity> childEntities, final String listElementXpathPrefix) {
 421         return childEntities.stream()
 422             .filter(fragmentEntity -> fragmentEntity.getXpath().startsWith(listElementXpathPrefix))
 423             .collect(Collectors.toMap(FragmentEntity::getXpath, fragmentEntity -> fragmentEntity));
 424     }
 425
 426     private static boolean isRootXpath(final String xpath) {
 427         return "/".equals(xpath) || "".equals(xpath);
 428     }
 429 }