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  *  Modifications Copyright (C) 2022 TechMahindra Ltd.
   7  *  ================================================================================
   8  *  Licensed under the Apache License, Version 2.0 (the "License");
   9  *  you may not use this file except in compliance with the License.
  10  *  You may obtain a copy of the License at
  11  *
  12  *        http://www.apache.org/licenses/LICENSE-2.0
  13  *
  14  *  Unless required by applicable law or agreed to in writing, software
  15  *  distributed under the License is distributed on an "AS IS" BASIS,
  16  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  17  *  See the License for the specific language governing permissions and
  18  *  limitations under the License.
  19  *
  20  *  SPDX-License-Identifier: Apache-2.0
  21  *  ============LICENSE_END=========================================================
  22  */
  23
  24 package org.onap.cps.spi.impl;
  25
  26 import com.google.common.collect.ImmutableSet;
  27 import com.google.common.collect.ImmutableSet.Builder;
  28 import java.io.Serializable;
  29 import java.util.ArrayList;
  30 import java.util.Collection;
  31 import java.util.Collections;
  32 import java.util.HashMap;
  33 import java.util.HashSet;
  34 import java.util.List;
  35 import java.util.Map;
  36 import java.util.Set;
  37 import java.util.regex.Matcher;
  38 import java.util.regex.Pattern;
  39 import java.util.stream.Collectors;
  40 import javax.transaction.Transactional;
  41 import lombok.RequiredArgsConstructor;
  42 import lombok.extern.slf4j.Slf4j;
  43 import org.hibernate.StaleStateException;
  44 import org.onap.cps.cpspath.parser.CpsPathQuery;
  45 import org.onap.cps.cpspath.parser.CpsPathUtil;
  46 import org.onap.cps.cpspath.parser.PathParsingException;
  47 import org.onap.cps.spi.CpsDataPersistenceService;
  48 import org.onap.cps.spi.FetchDescendantsOption;
  49 import org.onap.cps.spi.entities.AnchorEntity;
  50 import org.onap.cps.spi.entities.DataspaceEntity;
  51 import org.onap.cps.spi.entities.FragmentEntity;
  52 import org.onap.cps.spi.entities.FragmentEntityArranger;
  53 import org.onap.cps.spi.entities.FragmentExtract;
  54 import org.onap.cps.spi.exceptions.AlreadyDefinedException;
  55 import org.onap.cps.spi.exceptions.AlreadyDefinedExceptionBatch;
  56 import org.onap.cps.spi.exceptions.ConcurrencyException;
  57 import org.onap.cps.spi.exceptions.CpsAdminException;
  58 import org.onap.cps.spi.exceptions.CpsPathException;
  59 import org.onap.cps.spi.exceptions.DataNodeNotFoundException;
  60 import org.onap.cps.spi.model.DataNode;
  61 import org.onap.cps.spi.model.DataNodeBuilder;
  62 import org.onap.cps.spi.repository.AnchorRepository;
  63 import org.onap.cps.spi.repository.DataspaceRepository;
  64 import org.onap.cps.spi.repository.FragmentRepository;
  65 import org.onap.cps.spi.utils.SessionManager;
  66 import org.onap.cps.utils.JsonObjectMapper;
  67 import org.springframework.dao.DataIntegrityViolationException;
  68 import org.springframework.stereotype.Service;
  69
  70 @Service
  71 @Slf4j
  72 @RequiredArgsConstructor
  73 public class CpsDataPersistenceServiceImpl implements CpsDataPersistenceService {
  74
  75     private final DataspaceRepository dataspaceRepository;
  76     private final AnchorRepository anchorRepository;
  77     private final FragmentRepository fragmentRepository;
  78     private final JsonObjectMapper jsonObjectMapper;
  79     private final SessionManager sessionManager;
  80
  81     private static final String REG_EX_FOR_OPTIONAL_LIST_INDEX = "(\\[@[\\s\\S]+?]){0,1})";
  82
  83     @Override
  84     public void addChildDataNode(final String dataspaceName, final String anchorName, final String parentNodeXpath,
  85                                  final DataNode newChildDataNode) {
  86         addNewChildDataNode(dataspaceName, anchorName, parentNodeXpath, newChildDataNode);
  87     }
  88
  89     @Override
  90     public void addChildDataNodes(final String dataspaceName, final String anchorName,
  91                                   final String parentNodeXpath, final Collection<DataNode> dataNodes) {
  92         addChildrenDataNodes(dataspaceName, anchorName, parentNodeXpath, dataNodes);
  93     }
  94
  95     @Override
  96     public void addListElements(final String dataspaceName, final String anchorName, final String parentNodeXpath,
  97                                 final Collection<DataNode> newListElements) {
  98         addChildrenDataNodes(dataspaceName, anchorName, parentNodeXpath, newListElements);
  99     }
 100
 101     @Override
 102     public void addMultipleLists(final String dataspaceName, final String anchorName, final String parentNodeXpath,
 103                                  final Collection<Collection<DataNode>> newLists) {
 104         final Collection<String> failedXpaths = new HashSet<>();
 105         newLists.forEach(newList -> {
 106             try {
 107                 addChildrenDataNodes(dataspaceName, anchorName, parentNodeXpath, newList);
 108             } catch (final AlreadyDefinedExceptionBatch e) {
 109                 failedXpaths.addAll(e.getAlreadyDefinedXpaths());
 110             }
 111         });
 112
 113         if (!failedXpaths.isEmpty()) {
 114             throw new AlreadyDefinedExceptionBatch(failedXpaths);
 115         }
 116
 117     }
 118
 119     private void addNewChildDataNode(final String dataspaceName, final String anchorName,
 120                                      final String parentNodeXpath, final DataNode newChild) {
 121         final FragmentEntity parentFragmentEntity =
 122             getFragmentWithoutDescendantsByXpath(dataspaceName, anchorName, parentNodeXpath);
 123         final FragmentEntity newChildAsFragmentEntity =
 124                 convertToFragmentWithAllDescendants(parentFragmentEntity.getDataspace(),
 125                         parentFragmentEntity.getAnchor(), newChild);
 126         newChildAsFragmentEntity.setParentId(parentFragmentEntity.getId());
 127         try {
 128             fragmentRepository.save(newChildAsFragmentEntity);
 129         } catch (final DataIntegrityViolationException e) {
 130             throw AlreadyDefinedException.forDataNode(newChild.getXpath(), anchorName, e);
 131         }
 132
 133     }
 134
 135     private void addChildrenDataNodes(final String dataspaceName, final String anchorName, final String parentNodeXpath,
 136                                       final Collection<DataNode> newChildren) {
 137         final FragmentEntity parentFragmentEntity =
 138             getFragmentWithoutDescendantsByXpath(dataspaceName, anchorName, parentNodeXpath);
 139         final List<FragmentEntity> fragmentEntities = new ArrayList<>(newChildren.size());
 140         try {
 141             newChildren.forEach(newChildAsDataNode -> {
 142                 final FragmentEntity newChildAsFragmentEntity =
 143                         convertToFragmentWithAllDescendants(parentFragmentEntity.getDataspace(),
 144                                 parentFragmentEntity.getAnchor(), newChildAsDataNode);
 145                 newChildAsFragmentEntity.setParentId(parentFragmentEntity.getId());
 146                 fragmentEntities.add(newChildAsFragmentEntity);
 147             });
 148             fragmentRepository.saveAll(fragmentEntities);
 149         } catch (final DataIntegrityViolationException e) {
 150             log.warn("Exception occurred : {} , While saving : {} children, retrying using individual save operations",
 151                     e, fragmentEntities.size());
 152             retrySavingEachChildIndividually(dataspaceName, anchorName, parentNodeXpath, newChildren);
 153         }
 154     }
 155
 156     private void retrySavingEachChildIndividually(final String dataspaceName, final String anchorName,
 157                                                   final String parentNodeXpath,
 158                                                   final Collection<DataNode> newChildren) {
 159         final Collection<String> failedXpaths = new HashSet<>();
 160         for (final DataNode newChild : newChildren) {
 161             try {
 162                 addNewChildDataNode(dataspaceName, anchorName, parentNodeXpath, newChild);
 163             } catch (final AlreadyDefinedException e) {
 164                 failedXpaths.add(newChild.getXpath());
 165             }
 166         }
 167         if (!failedXpaths.isEmpty()) {
 168             throw new AlreadyDefinedExceptionBatch(failedXpaths);
 169         }
 170     }
 171
 172     @Override
 173     public void storeDataNode(final String dataspaceName, final String anchorName, final DataNode dataNode) {
 174         storeDataNodes(dataspaceName, anchorName, Collections.singletonList(dataNode));
 175     }
 176
 177     @Override
 178     public void storeDataNodes(final String dataspaceName, final String anchorName,
 179                                final Collection<DataNode> dataNodes) {
 180         final DataspaceEntity dataspaceEntity = dataspaceRepository.getByName(dataspaceName);
 181         final AnchorEntity anchorEntity = anchorRepository.getByDataspaceAndName(dataspaceEntity, anchorName);
 182         final List<FragmentEntity> fragmentEntities = new ArrayList<>(dataNodes.size());
 183         try {
 184             for (final DataNode dataNode: dataNodes) {
 185                 final FragmentEntity fragmentEntity = convertToFragmentWithAllDescendants(dataspaceEntity, anchorEntity,
 186                         dataNode);
 187                 fragmentEntities.add(fragmentEntity);
 188             }
 189             fragmentRepository.saveAll(fragmentEntities);
 190         } catch (final DataIntegrityViolationException exception) {
 191             log.warn("Exception occurred : {} , While saving : {} data nodes, Retrying saving data nodes individually",
 192                     exception, dataNodes.size());
 193             storeDataNodesIndividually(dataspaceName, anchorName, dataNodes);
 194         }
 195     }
 196
 197     private void storeDataNodesIndividually(final String dataspaceName, final String anchorName,
 198                                            final Collection<DataNode> dataNodes) {
 199         final DataspaceEntity dataspaceEntity = dataspaceRepository.getByName(dataspaceName);
 200         final AnchorEntity anchorEntity = anchorRepository.getByDataspaceAndName(dataspaceEntity, anchorName);
 201         final Collection<String> failedXpaths = new HashSet<>();
 202         for (final DataNode dataNode: dataNodes) {
 203             try {
 204                 final FragmentEntity fragmentEntity = convertToFragmentWithAllDescendants(dataspaceEntity, anchorEntity,
 205                         dataNode);
 206                 fragmentRepository.save(fragmentEntity);
 207             } catch (final DataIntegrityViolationException e) {
 208                 failedXpaths.add(dataNode.getXpath());
 209             }
 210         }
 211         if (!failedXpaths.isEmpty()) {
 212             throw new AlreadyDefinedExceptionBatch(failedXpaths);
 213         }
 214     }
 215
 216     /**
 217      * Convert DataNode object into Fragment and places the result in the fragments placeholder. Performs same action
 218      * for all DataNode children recursively.
 219      *
 220      * @param dataspaceEntity       dataspace
 221      * @param anchorEntity          anchorEntity
 222      * @param dataNodeToBeConverted dataNode
 223      * @return a Fragment built from current DataNode
 224      */
 225     private FragmentEntity convertToFragmentWithAllDescendants(final DataspaceEntity dataspaceEntity,
 226                                                                final AnchorEntity anchorEntity,
 227                                                                final DataNode dataNodeToBeConverted) {
 228         final FragmentEntity parentFragment = toFragmentEntity(dataspaceEntity, anchorEntity, dataNodeToBeConverted);
 229         final Builder<FragmentEntity> childFragmentsImmutableSetBuilder = ImmutableSet.builder();
 230         for (final DataNode childDataNode : dataNodeToBeConverted.getChildDataNodes()) {
 231             final FragmentEntity childFragment =
 232                     convertToFragmentWithAllDescendants(parentFragment.getDataspace(), parentFragment.getAnchor(),
 233                             childDataNode);
 234             childFragmentsImmutableSetBuilder.add(childFragment);
 235         }
 236         parentFragment.setChildFragments(childFragmentsImmutableSetBuilder.build());
 237         return parentFragment;
 238     }
 239
 240     private FragmentEntity toFragmentEntity(final DataspaceEntity dataspaceEntity,
 241                                             final AnchorEntity anchorEntity, final DataNode dataNode) {
 242         return FragmentEntity.builder()
 243                 .dataspace(dataspaceEntity)
 244                 .anchor(anchorEntity)
 245                 .xpath(dataNode.getXpath())
 246                 .attributes(jsonObjectMapper.asJsonString(dataNode.getLeaves()))
 247                 .build();
 248     }
 249
 250     @Override
 251     public DataNode getDataNode(final String dataspaceName, final String anchorName, final String xpath,
 252                                 final FetchDescendantsOption fetchDescendantsOption) {
 253         final FragmentEntity fragmentEntity = getFragmentByXpath(dataspaceName, anchorName, xpath,
 254             fetchDescendantsOption);
 255         return toDataNode(fragmentEntity, fetchDescendantsOption);
 256     }
 257
 258     private FragmentEntity getFragmentWithoutDescendantsByXpath(final String dataspaceName,
 259                                                                 final String anchorName,
 260                                                                 final String xpath) {
 261         return getFragmentByXpath(dataspaceName, anchorName, xpath, FetchDescendantsOption.OMIT_DESCENDANTS);
 262     }
 263
 264     private FragmentEntity getFragmentByXpath(final String dataspaceName, final String anchorName,
 265                                               final String xpath, final FetchDescendantsOption fetchDescendantsOption) {
 266         final DataspaceEntity dataspaceEntity = dataspaceRepository.getByName(dataspaceName);
 267         final AnchorEntity anchorEntity = anchorRepository.getByDataspaceAndName(dataspaceEntity, anchorName);
 268         if (isRootXpath(xpath)) {
 269             final List<FragmentExtract> fragmentExtracts = fragmentRepository.getTopLevelFragments(dataspaceEntity,
 270                     anchorEntity);
 271             return FragmentEntityArranger.toFragmentEntityTree(anchorEntity,
 272                     fragmentExtracts);
 273         } else {
 274             final String normalizedXpath = getNormalizedXpath(xpath);
 275             final FragmentEntity fragmentEntity;
 276             if (FetchDescendantsOption.OMIT_DESCENDANTS.equals(fetchDescendantsOption)) {
 277                 fragmentEntity =
 278                     fragmentRepository.getByDataspaceAndAnchorAndXpath(dataspaceEntity, anchorEntity, normalizedXpath);
 279             } else {
 280                 fragmentEntity = buildFragmentEntityFromFragmentExtracts(anchorEntity, normalizedXpath);
 281             }
 282             if (fragmentEntity == null) {
 283                 throw new DataNodeNotFoundException(dataspaceEntity.getName(), anchorEntity.getName(), xpath);
 284             }
 285             return fragmentEntity;
 286         }
 287     }
 288
 289     private FragmentEntity buildFragmentEntityFromFragmentExtracts(final AnchorEntity anchorEntity,
 290                                                                    final String normalizedXpath) {
 291         final FragmentEntity fragmentEntity;
 292         final List<FragmentExtract> fragmentExtracts =
 293                 fragmentRepository.findByAnchorIdAndParentXpath(anchorEntity.getId(), normalizedXpath);
 294         log.debug("Fetched {} fragment entities by anchor {} and cps path {}.",
 295                 fragmentExtracts.size(), anchorEntity.getName(), normalizedXpath);
 296         fragmentEntity = FragmentEntityArranger.toFragmentEntityTree(anchorEntity, fragmentExtracts);
 297         return fragmentEntity;
 298     }
 299
 300     @Override
 301     public List<DataNode> queryDataNodes(final String dataspaceName, final String anchorName, final String cpsPath,
 302                                          final FetchDescendantsOption fetchDescendantsOption) {
 303         final DataspaceEntity dataspaceEntity = dataspaceRepository.getByName(dataspaceName);
 304         final AnchorEntity anchorEntity = anchorRepository.getByDataspaceAndName(dataspaceEntity, anchorName);
 305         final CpsPathQuery cpsPathQuery;
 306         try {
 307             cpsPathQuery = CpsPathUtil.getCpsPathQuery(cpsPath);
 308         } catch (final PathParsingException e) {
 309             throw new CpsPathException(e.getMessage());
 310         }
 311         List<FragmentEntity> fragmentEntities =
 312                 fragmentRepository.findByAnchorAndCpsPath(anchorEntity.getId(), cpsPathQuery);
 313         if (cpsPathQuery.hasAncestorAxis()) {
 314             final Set<String> ancestorXpaths = processAncestorXpath(fragmentEntities, cpsPathQuery);
 315             fragmentEntities = ancestorXpaths.isEmpty() ? Collections.emptyList()
 316                     : fragmentRepository.findAllByAnchorAndXpathIn(anchorEntity, ancestorXpaths);
 317         }
 318         return createDataNodesFromFragmentEntities(fetchDescendantsOption, anchorEntity,
 319                 fragmentEntities);
 320     }
 321
 322     private List<DataNode> createDataNodesFromFragmentEntities(final FetchDescendantsOption fetchDescendantsOption,
 323                                                                final AnchorEntity anchorEntity,
 324                                                                final List<FragmentEntity> fragmentEntities) {
 325         final List<DataNode> dataNodes = new ArrayList<>(fragmentEntities.size());
 326         for (final FragmentEntity proxiedFragmentEntity : fragmentEntities) {
 327             final DataNode dataNode;
 328             if (FetchDescendantsOption.OMIT_DESCENDANTS.equals(fetchDescendantsOption)) {
 329                 dataNode = toDataNode(proxiedFragmentEntity, fetchDescendantsOption);
 330             } else {
 331                 final String normalizedXpath = getNormalizedXpath(proxiedFragmentEntity.getXpath());
 332                 final FragmentEntity unproxiedFragmentEntity = buildFragmentEntityFromFragmentExtracts(anchorEntity,
 333                         normalizedXpath);
 334                 dataNode = toDataNode(unproxiedFragmentEntity, fetchDescendantsOption);
 335             }
 336             dataNodes.add(dataNode);
 337         }
 338         return Collections.unmodifiableList(dataNodes);
 339     }
 340
 341     private static String getNormalizedXpath(final String xpathSource) {
 342         final String normalizedXpath;
 343         try {
 344             normalizedXpath = CpsPathUtil.getNormalizedXpath(xpathSource);
 345         } catch (final PathParsingException e) {
 346             throw new CpsPathException(e.getMessage());
 347         }
 348         return normalizedXpath;
 349     }
 350
 351     @Override
 352     public String startSession() {
 353         return sessionManager.startSession();
 354     }
 355
 356     @Override
 357     public void closeSession(final String sessionId) {
 358         sessionManager.closeSession(sessionId, SessionManager.WITH_COMMIT);
 359     }
 360
 361     @Override
 362     public void lockAnchor(final String sessionId, final String dataspaceName,
 363                            final String anchorName, final Long timeoutInMilliseconds) {
 364         sessionManager.lockAnchor(sessionId, dataspaceName, anchorName, timeoutInMilliseconds);
 365     }
 366
 367     private static Set<String> processAncestorXpath(final List<FragmentEntity> fragmentEntities,
 368                                                     final CpsPathQuery cpsPathQuery) {
 369         final Set<String> ancestorXpath = new HashSet<>();
 370         final Pattern pattern =
 371                 Pattern.compile("([\\s\\S]*\\/" + Pattern.quote(cpsPathQuery.getAncestorSchemaNodeIdentifier())
 372                         + REG_EX_FOR_OPTIONAL_LIST_INDEX + "\\/[\\s\\S]*");
 373         for (final FragmentEntity fragmentEntity : fragmentEntities) {
 374             final Matcher matcher = pattern.matcher(fragmentEntity.getXpath());
 375             if (matcher.matches()) {
 376                 ancestorXpath.add(matcher.group(1));
 377             }
 378         }
 379         return ancestorXpath;
 380     }
 381
 382     private DataNode toDataNode(final FragmentEntity fragmentEntity,
 383                                 final FetchDescendantsOption fetchDescendantsOption) {
 384         final List<DataNode> childDataNodes = getChildDataNodes(fragmentEntity, fetchDescendantsOption);
 385         Map<String, Serializable> leaves = new HashMap<>();
 386         if (fragmentEntity.getAttributes() != null) {
 387             leaves = jsonObjectMapper.convertJsonString(fragmentEntity.getAttributes(), Map.class);
 388         }
 389         return new DataNodeBuilder()
 390                 .withXpath(fragmentEntity.getXpath())
 391                 .withLeaves(leaves)
 392                 .withChildDataNodes(childDataNodes).build();
 393     }
 394
 395     private List<DataNode> getChildDataNodes(final FragmentEntity fragmentEntity,
 396                                              final FetchDescendantsOption fetchDescendantsOption) {
 397         if (fetchDescendantsOption.hasNext()) {
 398             return fragmentEntity.getChildFragments().stream()
 399                     .map(childFragmentEntity -> toDataNode(childFragmentEntity, fetchDescendantsOption.next()))
 400                     .collect(Collectors.toList());
 401         }
 402         return Collections.emptyList();
 403     }
 404
 405     @Override
 406     public void updateDataLeaves(final String dataspaceName, final String anchorName, final String xpath,
 407                                  final Map<String, Serializable> leaves) {
 408         final FragmentEntity fragmentEntity = getFragmentWithoutDescendantsByXpath(dataspaceName, anchorName, xpath);
 409         fragmentEntity.setAttributes(jsonObjectMapper.asJsonString(leaves));
 410         fragmentRepository.save(fragmentEntity);
 411     }
 412
 413     @Override
 414     public void updateDataNodeAndDescendants(final String dataspaceName, final String anchorName,
 415                                              final DataNode dataNode) {
 416         final FragmentEntity fragmentEntity =
 417             getFragmentWithoutDescendantsByXpath(dataspaceName, anchorName, dataNode.getXpath());
 418         updateFragmentEntityAndDescendantsWithDataNode(fragmentEntity, dataNode);
 419         try {
 420             fragmentRepository.save(fragmentEntity);
 421         } catch (final StaleStateException staleStateException) {
 422             throw new ConcurrencyException("Concurrent Transactions",
 423                     String.format("dataspace :'%s', Anchor : '%s' and xpath: '%s' is updated by another transaction.",
 424                             dataspaceName, anchorName, dataNode.getXpath()));
 425         }
 426     }
 427
 428     @Override
 429     public void updateDataNodesAndDescendants(final String dataspaceName,
 430                                               final String anchorName,
 431                                               final List<DataNode> dataNodes) {
 432
 433         final Map<DataNode, FragmentEntity> dataNodeFragmentEntityMap = dataNodes.stream()
 434                 .collect(Collectors.toMap(
 435                         dataNode -> dataNode,
 436                         dataNode ->
 437                             getFragmentWithoutDescendantsByXpath(dataspaceName, anchorName, dataNode.getXpath())));
 438         dataNodeFragmentEntityMap.forEach(
 439                 (dataNode, fragmentEntity) -> updateFragmentEntityAndDescendantsWithDataNode(fragmentEntity, dataNode));
 440         try {
 441             fragmentRepository.saveAll(dataNodeFragmentEntityMap.values());
 442         } catch (final StaleStateException staleStateException) {
 443             retryUpdateDataNodesIndividually(dataspaceName, anchorName, dataNodeFragmentEntityMap.values());
 444         }
 445     }
 446
 447     private void retryUpdateDataNodesIndividually(final String dataspaceName, final String anchorName,
 448                                                   final Collection<FragmentEntity> fragmentEntities) {
 449         final Collection<String> failedXpaths = new HashSet<>();
 450
 451         fragmentEntities.forEach(dataNodeFragment -> {
 452             try {
 453                 fragmentRepository.save(dataNodeFragment);
 454             } catch (final StaleStateException e) {
 455                 failedXpaths.add(dataNodeFragment.getXpath());
 456             }
 457         });
 458
 459         if (!failedXpaths.isEmpty()) {
 460             final String failedXpathsConcatenated = String.join(",", failedXpaths);
 461             throw new ConcurrencyException("Concurrent Transactions", String.format(
 462                     "DataNodes : %s in Dataspace :'%s' with Anchor : '%s'  are updated by another transaction.",
 463                     failedXpathsConcatenated, dataspaceName, anchorName));
 464         }
 465     }
 466
 467     private void updateFragmentEntityAndDescendantsWithDataNode(final FragmentEntity existingFragmentEntity,
 468                                                                 final DataNode newDataNode) {
 469
 470         existingFragmentEntity.setAttributes(jsonObjectMapper.asJsonString(newDataNode.getLeaves()));
 471
 472         final Map<String, FragmentEntity> existingChildrenByXpath = existingFragmentEntity.getChildFragments().stream()
 473                 .collect(Collectors.toMap(FragmentEntity::getXpath, childFragmentEntity -> childFragmentEntity));
 474
 475         final Collection<FragmentEntity> updatedChildFragments = new HashSet<>();
 476
 477         for (final DataNode newDataNodeChild : newDataNode.getChildDataNodes()) {
 478             final FragmentEntity childFragment;
 479             if (isNewDataNode(newDataNodeChild, existingChildrenByXpath)) {
 480                 childFragment = convertToFragmentWithAllDescendants(
 481                         existingFragmentEntity.getDataspace(), existingFragmentEntity.getAnchor(), newDataNodeChild);
 482             } else {
 483                 childFragment = existingChildrenByXpath.get(newDataNodeChild.getXpath());
 484                 updateFragmentEntityAndDescendantsWithDataNode(childFragment, newDataNodeChild);
 485             }
 486             updatedChildFragments.add(childFragment);
 487         }
 488
 489         existingFragmentEntity.getChildFragments().clear();
 490         existingFragmentEntity.getChildFragments().addAll(updatedChildFragments);
 491     }
 492
 493     @Override
 494     @Transactional
 495     public void replaceListContent(final String dataspaceName, final String anchorName, final String parentNodeXpath,
 496                                    final Collection<DataNode> newListElements) {
 497         final FragmentEntity parentEntity =
 498             getFragmentWithoutDescendantsByXpath(dataspaceName, anchorName, parentNodeXpath);
 499         final String listElementXpathPrefix = getListElementXpathPrefix(newListElements);
 500         final Map<String, FragmentEntity> existingListElementFragmentEntitiesByXPath =
 501                 extractListElementFragmentEntitiesByXPath(parentEntity.getChildFragments(), listElementXpathPrefix);
 502         deleteListElements(parentEntity.getChildFragments(), existingListElementFragmentEntitiesByXPath);
 503         final Set<FragmentEntity> updatedChildFragmentEntities = new HashSet<>();
 504         for (final DataNode newListElement : newListElements) {
 505             final FragmentEntity existingListElementEntity =
 506                     existingListElementFragmentEntitiesByXPath.get(newListElement.getXpath());
 507             final FragmentEntity entityToBeAdded = getFragmentForReplacement(parentEntity, newListElement,
 508                     existingListElementEntity);
 509
 510             updatedChildFragmentEntities.add(entityToBeAdded);
 511         }
 512         parentEntity.getChildFragments().addAll(updatedChildFragmentEntities);
 513         fragmentRepository.save(parentEntity);
 514     }
 515
 516     @Override
 517     @Transactional
 518     public void deleteDataNodes(final String dataspaceName, final String anchorName) {
 519         final DataspaceEntity dataspaceEntity = dataspaceRepository.getByName(dataspaceName);
 520         anchorRepository.findByDataspaceAndName(dataspaceEntity, anchorName)
 521                 .ifPresent(
 522                         anchorEntity -> fragmentRepository.deleteByAnchorIn(Set.of(anchorEntity)));
 523     }
 524
 525     @Override
 526     @Transactional
 527     public void deleteListDataNode(final String dataspaceName, final String anchorName,
 528                                    final String targetXpath) {
 529         deleteDataNode(dataspaceName, anchorName, targetXpath, true);
 530     }
 531
 532     @Override
 533     @Transactional
 534     public void deleteDataNode(final String dataspaceName, final String anchorName, final String targetXpath) {
 535         deleteDataNode(dataspaceName, anchorName, targetXpath, false);
 536     }
 537
 538     private void deleteDataNode(final String dataspaceName, final String anchorName, final String targetXpath,
 539                                 final boolean onlySupportListNodeDeletion) {
 540         final String parentNodeXpath;
 541         FragmentEntity parentFragmentEntity = null;
 542         boolean targetDeleted;
 543         if (isRootXpath(targetXpath)) {
 544             deleteDataNodes(dataspaceName, anchorName);
 545             targetDeleted = true;
 546         } else {
 547             if (isRootContainerNodeXpath(targetXpath)) {
 548                 parentNodeXpath = targetXpath;
 549             } else {
 550                 parentNodeXpath = CpsPathUtil.getNormalizedParentXpath(targetXpath);
 551             }
 552             parentFragmentEntity = getFragmentWithoutDescendantsByXpath(dataspaceName, anchorName, parentNodeXpath);
 553             if (CpsPathUtil.isPathToListElement(targetXpath)) {
 554                 targetDeleted = deleteDataNode(parentFragmentEntity, targetXpath);
 555             } else {
 556                 targetDeleted = deleteAllListElements(parentFragmentEntity, targetXpath);
 557                 final boolean tryToDeleteDataNode = !targetDeleted && !onlySupportListNodeDeletion;
 558                 if (tryToDeleteDataNode) {
 559                     targetDeleted = deleteDataNode(parentFragmentEntity, targetXpath);
 560                 }
 561             }
 562         }
 563         if (!targetDeleted) {
 564             final String additionalInformation = onlySupportListNodeDeletion
 565                     ? "The target is probably not a List." : "";
 566             throw new DataNodeNotFoundException(parentFragmentEntity.getDataspace().getName(),
 567                     parentFragmentEntity.getAnchor().getName(), targetXpath, additionalInformation);
 568         }
 569     }
 570
 571     private boolean deleteDataNode(final FragmentEntity parentFragmentEntity, final String targetXpath) {
 572         final String normalizedTargetXpath = CpsPathUtil.getNormalizedXpath(targetXpath);
 573         if (parentFragmentEntity.getXpath().equals(normalizedTargetXpath)) {
 574             fragmentRepository.delete(parentFragmentEntity);
 575             return true;
 576         }
 577         if (parentFragmentEntity.getChildFragments()
 578                 .removeIf(fragment -> fragment.getXpath().equals(normalizedTargetXpath))) {
 579             fragmentRepository.save(parentFragmentEntity);
 580             return true;
 581         }
 582         return false;
 583     }
 584
 585     private boolean deleteAllListElements(final FragmentEntity parentFragmentEntity, final String listXpath) {
 586         final String normalizedListXpath = CpsPathUtil.getNormalizedXpath(listXpath);
 587         final String deleteTargetXpathPrefix = normalizedListXpath + "[";
 588         if (parentFragmentEntity.getChildFragments()
 589                 .removeIf(fragment -> fragment.getXpath().startsWith(deleteTargetXpathPrefix))) {
 590             fragmentRepository.save(parentFragmentEntity);
 591             return true;
 592         }
 593         return false;
 594     }
 595
 596     private static void deleteListElements(
 597             final Collection<FragmentEntity> fragmentEntities,
 598             final Map<String, FragmentEntity> existingListElementFragmentEntitiesByXPath) {
 599         fragmentEntities.removeAll(existingListElementFragmentEntitiesByXPath.values());
 600     }
 601
 602     private static String getListElementXpathPrefix(final Collection<DataNode> newListElements) {
 603         if (newListElements.isEmpty()) {
 604             throw new CpsAdminException("Invalid list replacement",
 605                     "Cannot replace list elements with empty collection");
 606         }
 607         final String firstChildNodeXpath = newListElements.iterator().next().getXpath();
 608         return firstChildNodeXpath.substring(0, firstChildNodeXpath.lastIndexOf('[') + 1);
 609     }
 610
 611     private FragmentEntity getFragmentForReplacement(final FragmentEntity parentEntity,
 612                                                      final DataNode newListElement,
 613                                                      final FragmentEntity existingListElementEntity) {
 614         if (existingListElementEntity == null) {
 615             return convertToFragmentWithAllDescendants(
 616                     parentEntity.getDataspace(), parentEntity.getAnchor(), newListElement);
 617         }
 618         if (newListElement.getChildDataNodes().isEmpty()) {
 619             copyAttributesFromNewListElement(existingListElementEntity, newListElement);
 620             existingListElementEntity.getChildFragments().clear();
 621         } else {
 622             updateFragmentEntityAndDescendantsWithDataNode(existingListElementEntity, newListElement);
 623         }
 624         return existingListElementEntity;
 625     }
 626
 627     private static boolean isNewDataNode(final DataNode replacementDataNode,
 628                                          final Map<String, FragmentEntity> existingListElementsByXpath) {
 629         return !existingListElementsByXpath.containsKey(replacementDataNode.getXpath());
 630     }
 631
 632     private static boolean isRootContainerNodeXpath(final String xpath) {
 633         return 0 == xpath.lastIndexOf('/');
 634     }
 635
 636     private void copyAttributesFromNewListElement(final FragmentEntity existingListElementEntity,
 637                                                   final DataNode newListElement) {
 638         final FragmentEntity replacementFragmentEntity =
 639                 FragmentEntity.builder().attributes(jsonObjectMapper.asJsonString(
 640                         newListElement.getLeaves())).build();
 641         existingListElementEntity.setAttributes(replacementFragmentEntity.getAttributes());
 642     }
 643
 644     private static Map<String, FragmentEntity> extractListElementFragmentEntitiesByXPath(
 645             final Set<FragmentEntity> childEntities, final String listElementXpathPrefix) {
 646         return childEntities.stream()
 647                 .filter(fragmentEntity -> fragmentEntity.getXpath().startsWith(listElementXpathPrefix))
 648                 .collect(Collectors.toMap(FragmentEntity::getXpath, fragmentEntity -> fragmentEntity));
 649     }
 650
 651     private static boolean isRootXpath(final String xpath) {
 652         return "/".equals(xpath) || "".equals(xpath);
 653     }
 654 }