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

   1 /*
   2  *  ============LICENSE_START=======================================================
   3  *  Copyright (C) 2021-2023 Nordix Foundation
   4  *  Modifications Copyright (C) 2021 Pantheon.tech
   5  *  Modifications Copyright (C) 2020-2022 Bell Canada.
   6  *  Modifications Copyright (C) 2022-2023 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.base.Strings;
  27 import com.google.common.collect.ImmutableSet;
  28 import com.google.common.collect.ImmutableSet.Builder;
  29 import io.micrometer.core.annotation.Timed;
  30 import java.io.Serializable;
  31 import java.util.ArrayList;
  32 import java.util.Collection;
  33 import java.util.Collections;
  34 import java.util.HashMap;
  35 import java.util.HashSet;
  36 import java.util.List;
  37 import java.util.Map;
  38 import java.util.Set;
  39 import java.util.function.Function;
  40 import java.util.regex.Matcher;
  41 import java.util.regex.Pattern;
  42 import java.util.stream.Collectors;
  43 import javax.transaction.Transactional;
  44 import lombok.RequiredArgsConstructor;
  45 import lombok.extern.slf4j.Slf4j;
  46 import org.hibernate.StaleStateException;
  47 import org.onap.cps.cpspath.parser.CpsPathQuery;
  48 import org.onap.cps.cpspath.parser.CpsPathUtil;
  49 import org.onap.cps.cpspath.parser.PathParsingException;
  50 import org.onap.cps.spi.CpsDataPersistenceService;
  51 import org.onap.cps.spi.FetchDescendantsOption;
  52 import org.onap.cps.spi.entities.AnchorEntity;
  53 import org.onap.cps.spi.entities.DataspaceEntity;
  54 import org.onap.cps.spi.entities.FragmentEntity;
  55 import org.onap.cps.spi.entities.FragmentEntityArranger;
  56 import org.onap.cps.spi.entities.FragmentExtract;
  57 import org.onap.cps.spi.exceptions.AlreadyDefinedException;
  58 import org.onap.cps.spi.exceptions.AlreadyDefinedExceptionBatch;
  59 import org.onap.cps.spi.exceptions.ConcurrencyException;
  60 import org.onap.cps.spi.exceptions.CpsAdminException;
  61 import org.onap.cps.spi.exceptions.CpsPathException;
  62 import org.onap.cps.spi.exceptions.DataNodeNotFoundException;
  63 import org.onap.cps.spi.exceptions.DataNodeNotFoundExceptionBatch;
  64 import org.onap.cps.spi.model.DataNode;
  65 import org.onap.cps.spi.model.DataNodeBuilder;
  66 import org.onap.cps.spi.repository.AnchorRepository;
  67 import org.onap.cps.spi.repository.DataspaceRepository;
  68 import org.onap.cps.spi.repository.FragmentRepository;
  69 import org.onap.cps.spi.utils.SessionManager;
  70 import org.onap.cps.utils.JsonObjectMapper;
  71 import org.springframework.dao.DataIntegrityViolationException;
  72 import org.springframework.stereotype.Service;
  73
  74 @Service
  75 @Slf4j
  76 @RequiredArgsConstructor
  77 public class CpsDataPersistenceServiceImpl implements CpsDataPersistenceService {
  78
  79     private final DataspaceRepository dataspaceRepository;
  80     private final AnchorRepository anchorRepository;
  81     private final FragmentRepository fragmentRepository;
  82     private final JsonObjectMapper jsonObjectMapper;
  83     private final SessionManager sessionManager;
  84
  85     private static final String REG_EX_FOR_OPTIONAL_LIST_INDEX = "(\\[@[\\s\\S]+?])?)";
  86     private static final String QUERY_ACROSS_ANCHORS = null;
  87     private static final AnchorEntity ALL_ANCHORS = null;
  88
  89     @Override
  90     public void addChildDataNode(final String dataspaceName, final String anchorName, final String parentNodeXpath,
  91                                  final DataNode newChildDataNode) {
  92         final AnchorEntity anchorEntity = getAnchorEntity(dataspaceName, anchorName);
  93         addNewChildDataNode(anchorEntity, parentNodeXpath, newChildDataNode);
  94     }
  95
  96     @Override
  97     public void addChildDataNodes(final String dataspaceName, final String anchorName,
  98                                   final String parentNodeXpath, final Collection<DataNode> dataNodes) {
  99         final AnchorEntity anchorEntity = getAnchorEntity(dataspaceName, anchorName);
 100         addChildrenDataNodes(anchorEntity, parentNodeXpath, dataNodes);
 101     }
 102
 103     @Override
 104     public void addListElements(final String dataspaceName, final String anchorName, final String parentNodeXpath,
 105                                 final Collection<DataNode> newListElements) {
 106         final AnchorEntity anchorEntity = getAnchorEntity(dataspaceName, anchorName);
 107         addChildrenDataNodes(anchorEntity, parentNodeXpath, newListElements);
 108     }
 109
 110     @Override
 111     public void addMultipleLists(final String dataspaceName, final String anchorName, final String parentNodeXpath,
 112                                  final Collection<Collection<DataNode>> newLists) {
 113         final AnchorEntity anchorEntity = getAnchorEntity(dataspaceName, anchorName);
 114         final Collection<String> failedXpaths = new HashSet<>();
 115         for (final Collection<DataNode> newList : newLists) {
 116             try {
 117                 addChildrenDataNodes(anchorEntity, parentNodeXpath, newList);
 118             } catch (final AlreadyDefinedExceptionBatch e) {
 119                 failedXpaths.addAll(e.getAlreadyDefinedXpaths());
 120             }
 121         }
 122         if (!failedXpaths.isEmpty()) {
 123             throw new AlreadyDefinedExceptionBatch(failedXpaths);
 124         }
 125     }
 126
 127     private void addNewChildDataNode(final AnchorEntity anchorEntity, final String parentNodeXpath,
 128                                      final DataNode newChild) {
 129         final FragmentEntity parentFragmentEntity = getFragmentEntity(anchorEntity, parentNodeXpath);
 130         final FragmentEntity newChildAsFragmentEntity = convertToFragmentWithAllDescendants(anchorEntity, newChild);
 131         newChildAsFragmentEntity.setParentId(parentFragmentEntity.getId());
 132         try {
 133             fragmentRepository.save(newChildAsFragmentEntity);
 134         } catch (final DataIntegrityViolationException e) {
 135             throw AlreadyDefinedException.forDataNode(newChild.getXpath(), anchorEntity.getName(), e);
 136         }
 137     }
 138
 139     private void addChildrenDataNodes(final AnchorEntity anchorEntity, final String parentNodeXpath,
 140                                       final Collection<DataNode> newChildren) {
 141         final FragmentEntity parentFragmentEntity = getFragmentEntity(anchorEntity, parentNodeXpath);
 142         final List<FragmentEntity> fragmentEntities = new ArrayList<>(newChildren.size());
 143         try {
 144             for (final DataNode newChildAsDataNode : newChildren) {
 145                 final FragmentEntity newChildAsFragmentEntity =
 146                     convertToFragmentWithAllDescendants(anchorEntity, newChildAsDataNode);
 147                 newChildAsFragmentEntity.setParentId(parentFragmentEntity.getId());
 148                 fragmentEntities.add(newChildAsFragmentEntity);
 149             }
 150             fragmentRepository.saveAll(fragmentEntities);
 151         } catch (final DataIntegrityViolationException e) {
 152             log.warn("Exception occurred : {} , While saving : {} children, retrying using individual save operations",
 153                     e, fragmentEntities.size());
 154             retrySavingEachChildIndividually(anchorEntity, parentNodeXpath, newChildren);
 155         }
 156     }
 157
 158     private void retrySavingEachChildIndividually(final AnchorEntity anchorEntity, final String parentNodeXpath,
 159                                                   final Collection<DataNode> newChildren) {
 160         final Collection<String> failedXpaths = new HashSet<>();
 161         for (final DataNode newChild : newChildren) {
 162             try {
 163                 addNewChildDataNode(anchorEntity, parentNodeXpath, newChild);
 164             } catch (final AlreadyDefinedException e) {
 165                 failedXpaths.add(newChild.getXpath());
 166             }
 167         }
 168         if (!failedXpaths.isEmpty()) {
 169             throw new AlreadyDefinedExceptionBatch(failedXpaths);
 170         }
 171     }
 172
 173     @Override
 174     public void storeDataNode(final String dataspaceName, final String anchorName, final DataNode dataNode) {
 175         storeDataNodes(dataspaceName, anchorName, Collections.singletonList(dataNode));
 176     }
 177
 178     @Override
 179     public void storeDataNodes(final String dataspaceName, final String anchorName,
 180                                final Collection<DataNode> dataNodes) {
 181         final AnchorEntity anchorEntity = getAnchorEntity(dataspaceName, anchorName);
 182         final List<FragmentEntity> fragmentEntities = new ArrayList<>(dataNodes.size());
 183         try {
 184             for (final DataNode dataNode: dataNodes) {
 185                 final FragmentEntity fragmentEntity = convertToFragmentWithAllDescendants(anchorEntity, dataNode);
 186                 fragmentEntities.add(fragmentEntity);
 187             }
 188             fragmentRepository.saveAll(fragmentEntities);
 189         } catch (final DataIntegrityViolationException exception) {
 190             log.warn("Exception occurred : {} , While saving : {} data nodes, Retrying saving data nodes individually",
 191                     exception, dataNodes.size());
 192             storeDataNodesIndividually(anchorEntity, dataNodes);
 193         }
 194     }
 195
 196     private void storeDataNodesIndividually(final AnchorEntity anchorEntity, final Collection<DataNode> dataNodes) {
 197         final Collection<String> failedXpaths = new HashSet<>();
 198         for (final DataNode dataNode: dataNodes) {
 199             try {
 200                 final FragmentEntity fragmentEntity = convertToFragmentWithAllDescendants(anchorEntity, dataNode);
 201                 fragmentRepository.save(fragmentEntity);
 202             } catch (final DataIntegrityViolationException e) {
 203                 failedXpaths.add(dataNode.getXpath());
 204             }
 205         }
 206         if (!failedXpaths.isEmpty()) {
 207             throw new AlreadyDefinedExceptionBatch(failedXpaths);
 208         }
 209     }
 210
 211     /**
 212      * Convert DataNode object into Fragment and places the result in the fragments placeholder. Performs same action
 213      * for all DataNode children recursively.
 214      *
 215      * @param anchorEntity          anchorEntity
 216      * @param dataNodeToBeConverted dataNode
 217      * @return a Fragment built from current DataNode
 218      */
 219     private FragmentEntity convertToFragmentWithAllDescendants(final AnchorEntity anchorEntity,
 220                                                                final DataNode dataNodeToBeConverted) {
 221         final FragmentEntity parentFragment = toFragmentEntity(anchorEntity, dataNodeToBeConverted);
 222         final Builder<FragmentEntity> childFragmentsImmutableSetBuilder = ImmutableSet.builder();
 223         for (final DataNode childDataNode : dataNodeToBeConverted.getChildDataNodes()) {
 224             final FragmentEntity childFragment = convertToFragmentWithAllDescendants(anchorEntity, childDataNode);
 225             childFragmentsImmutableSetBuilder.add(childFragment);
 226         }
 227         parentFragment.setChildFragments(childFragmentsImmutableSetBuilder.build());
 228         return parentFragment;
 229     }
 230
 231     private FragmentEntity toFragmentEntity(final AnchorEntity anchorEntity, final DataNode dataNode) {
 232         return FragmentEntity.builder()
 233                 .dataspace(anchorEntity.getDataspace())
 234                 .anchor(anchorEntity)
 235                 .xpath(dataNode.getXpath())
 236                 .attributes(jsonObjectMapper.asJsonString(dataNode.getLeaves()))
 237                 .build();
 238     }
 239
 240     @Override
 241     @Timed(value = "cps.data.persistence.service.datanode.get",
 242             description = "Time taken to get a data node")
 243     public Collection<DataNode> getDataNodes(final String dataspaceName, final String anchorName,
 244                                              final String xpath,
 245                                              final FetchDescendantsOption fetchDescendantsOption) {
 246         final String targetXpath = getNormalizedXpath(xpath);
 247         final Collection<DataNode> dataNodes = getDataNodesForMultipleXpaths(dataspaceName, anchorName,
 248                 Collections.singletonList(targetXpath), fetchDescendantsOption);
 249         if (dataNodes.isEmpty()) {
 250             throw new DataNodeNotFoundException(dataspaceName, anchorName, xpath);
 251         }
 252         return dataNodes;
 253     }
 254
 255     @Override
 256     @Timed(value = "cps.data.persistence.service.datanode.batch.get",
 257             description = "Time taken to get data nodes")
 258     public Collection<DataNode> getDataNodesForMultipleXpaths(final String dataspaceName, final String anchorName,
 259                                                               final Collection<String> xpaths,
 260                                                               final FetchDescendantsOption fetchDescendantsOption) {
 261         final AnchorEntity anchorEntity = getAnchorEntity(dataspaceName, anchorName);
 262         final Collection<FragmentEntity> fragmentEntities =
 263             getFragmentEntities(anchorEntity, xpaths, fetchDescendantsOption);
 264         return toDataNodes(fragmentEntities, fetchDescendantsOption);
 265     }
 266
 267     private Collection<FragmentEntity> getFragmentEntities(final AnchorEntity anchorEntity,
 268                                                            final Collection<String> xpaths,
 269                                                            final FetchDescendantsOption fetchDescendantsOption) {
 270         final Collection<String> nonRootXpaths = new HashSet<>(xpaths);
 271         final boolean haveRootXpath = nonRootXpaths.removeIf(CpsDataPersistenceServiceImpl::isRootXpath);
 272
 273         final Collection<String> normalizedXpaths = new HashSet<>(nonRootXpaths.size());
 274         for (final String xpath : nonRootXpaths) {
 275             try {
 276                 normalizedXpaths.add(CpsPathUtil.getNormalizedXpath(xpath));
 277             } catch (final PathParsingException e) {
 278                 log.warn("Error parsing xpath \"{}\": {}", xpath, e.getMessage());
 279             }
 280         }
 281         if (haveRootXpath) {
 282             normalizedXpaths.addAll(fragmentRepository.findAllXpathByAnchorAndParentIdIsNull(anchorEntity));
 283         }
 284
 285         final List<FragmentExtract> fragmentExtracts =
 286             fragmentRepository.findExtractsWithDescendants(anchorEntity.getId(), normalizedXpaths,
 287                 fetchDescendantsOption.getDepth());
 288
 289         return FragmentEntityArranger.toFragmentEntityTrees(anchorEntity, fragmentExtracts);
 290     }
 291
 292     private FragmentEntity getFragmentEntity(final AnchorEntity anchorEntity, final String xpath) {
 293         final FragmentEntity fragmentEntity;
 294         if (isRootXpath(xpath)) {
 295             final List<FragmentExtract> fragmentExtracts = fragmentRepository.findAllExtractsByAnchor(anchorEntity);
 296             fragmentEntity = FragmentEntityArranger.toFragmentEntityTrees(anchorEntity, fragmentExtracts)
 297                 .stream().findFirst().orElse(null);
 298         } else {
 299             fragmentEntity = fragmentRepository.getByAnchorAndXpath(anchorEntity, getNormalizedXpath(xpath));
 300         }
 301         if (fragmentEntity == null) {
 302             throw new DataNodeNotFoundException(anchorEntity.getDataspace().getName(), anchorEntity.getName(), xpath);
 303         }
 304         return fragmentEntity;
 305     }
 306
 307     @Override
 308     @Timed(value = "cps.data.persistence.service.datanode.query",
 309             description = "Time taken to query data nodes")
 310     public List<DataNode> queryDataNodes(final String dataspaceName, final String anchorName, final String cpsPath,
 311                                          final FetchDescendantsOption fetchDescendantsOption) {
 312         final DataspaceEntity dataspaceEntity = dataspaceRepository.getByName(dataspaceName);
 313         final AnchorEntity anchorEntity = Strings.isNullOrEmpty(anchorName) ? ALL_ANCHORS
 314             : anchorRepository.getByDataspaceAndName(dataspaceEntity, anchorName);
 315         final CpsPathQuery cpsPathQuery;
 316         try {
 317             cpsPathQuery = CpsPathUtil.getCpsPathQuery(cpsPath);
 318         } catch (final PathParsingException e) {
 319             throw new CpsPathException(e.getMessage());
 320         }
 321
 322         Collection<FragmentEntity> fragmentEntities;
 323         if (anchorEntity == ALL_ANCHORS) {
 324             fragmentEntities = fragmentRepository.findByDataspaceAndCpsPath(dataspaceEntity, cpsPathQuery);
 325         } else {
 326             fragmentEntities = fragmentRepository.findByAnchorAndCpsPath(anchorEntity, cpsPathQuery);
 327         }
 328         if (cpsPathQuery.hasAncestorAxis()) {
 329             final Collection<String> ancestorXpaths = processAncestorXpath(fragmentEntities, cpsPathQuery);
 330             if (anchorEntity == ALL_ANCHORS) {
 331                 fragmentEntities = fragmentRepository.findByDataspaceAndXpathIn(dataspaceEntity, ancestorXpaths);
 332             } else {
 333                 fragmentEntities = fragmentRepository.findByAnchorAndXpathIn(anchorEntity, ancestorXpaths);
 334             }
 335         }
 336         fragmentEntities = prefetchDescendantsForFragmentEntities(fetchDescendantsOption, anchorEntity,
 337             fragmentEntities);
 338         return createDataNodesFromFragmentEntities(fetchDescendantsOption, fragmentEntities);
 339     }
 340
 341     @Override
 342     public List<DataNode> queryDataNodesAcrossAnchors(final String dataspaceName, final String cpsPath,
 343                                                       final FetchDescendantsOption fetchDescendantsOption) {
 344         return queryDataNodes(dataspaceName, QUERY_ACROSS_ANCHORS, cpsPath, fetchDescendantsOption);
 345     }
 346
 347     private Collection<FragmentEntity> prefetchDescendantsForFragmentEntities(
 348                                             final FetchDescendantsOption fetchDescendantsOption,
 349                                             final AnchorEntity anchorEntity,
 350                                             final Collection<FragmentEntity> proxiedFragmentEntities) {
 351         if (FetchDescendantsOption.OMIT_DESCENDANTS.equals(fetchDescendantsOption)) {
 352             return proxiedFragmentEntities;
 353         }
 354
 355         final List<Long> fragmentEntityIds = proxiedFragmentEntities.stream()
 356             .map(FragmentEntity::getId).collect(Collectors.toList());
 357
 358         final List<FragmentExtract> fragmentExtracts =
 359             fragmentRepository.findExtractsWithDescendantsByIds(fragmentEntityIds, fetchDescendantsOption.getDepth());
 360
 361         if (anchorEntity == ALL_ANCHORS) {
 362             final Collection<Integer> anchorIds = fragmentExtracts.stream()
 363                 .map(FragmentExtract::getAnchorId).collect(Collectors.toSet());
 364             final List<AnchorEntity> anchorEntities = anchorRepository.findAllById(anchorIds);
 365             final Map<Integer, AnchorEntity> anchorEntityPerId = anchorEntities.stream()
 366                 .collect(Collectors.toMap(AnchorEntity::getId, Function.identity()));
 367             return FragmentEntityArranger.toFragmentEntityTreesAcrossAnchors(anchorEntityPerId, fragmentExtracts);
 368         }
 369         return FragmentEntityArranger.toFragmentEntityTrees(anchorEntity, fragmentExtracts);
 370     }
 371
 372     private List<DataNode> createDataNodesFromFragmentEntities(final FetchDescendantsOption fetchDescendantsOption,
 373                                                                final Collection<FragmentEntity> fragmentEntities) {
 374         final List<DataNode> dataNodes = new ArrayList<>(fragmentEntities.size());
 375         for (final FragmentEntity fragmentEntity : fragmentEntities) {
 376             dataNodes.add(toDataNode(fragmentEntity, fetchDescendantsOption));
 377         }
 378         return Collections.unmodifiableList(dataNodes);
 379     }
 380
 381     private static String getNormalizedXpath(final String xpathSource) {
 382         if (isRootXpath(xpathSource)) {
 383             return xpathSource;
 384         }
 385         try {
 386             return CpsPathUtil.getNormalizedXpath(xpathSource);
 387         } catch (final PathParsingException e) {
 388             throw new CpsPathException(e.getMessage());
 389         }
 390     }
 391
 392     @Override
 393     public String startSession() {
 394         return sessionManager.startSession();
 395     }
 396
 397     @Override
 398     public void closeSession(final String sessionId) {
 399         sessionManager.closeSession(sessionId, SessionManager.WITH_COMMIT);
 400     }
 401
 402     @Override
 403     public void lockAnchor(final String sessionId, final String dataspaceName,
 404                            final String anchorName, final Long timeoutInMilliseconds) {
 405         sessionManager.lockAnchor(sessionId, dataspaceName, anchorName, timeoutInMilliseconds);
 406     }
 407
 408     private static Set<String> processAncestorXpath(final Collection<FragmentEntity> fragmentEntities,
 409                                                     final CpsPathQuery cpsPathQuery) {
 410         final Set<String> ancestorXpath = new HashSet<>();
 411         final Pattern pattern =
 412                 Pattern.compile("([\\s\\S]*/" + Pattern.quote(cpsPathQuery.getAncestorSchemaNodeIdentifier())
 413                         + REG_EX_FOR_OPTIONAL_LIST_INDEX + "/[\\s\\S]*");
 414         for (final FragmentEntity fragmentEntity : fragmentEntities) {
 415             final Matcher matcher = pattern.matcher(fragmentEntity.getXpath());
 416             if (matcher.matches()) {
 417                 ancestorXpath.add(matcher.group(1));
 418             }
 419         }
 420         return ancestorXpath;
 421     }
 422
 423     private DataNode toDataNode(final FragmentEntity fragmentEntity,
 424                                 final FetchDescendantsOption fetchDescendantsOption) {
 425         final List<DataNode> childDataNodes = getChildDataNodes(fragmentEntity, fetchDescendantsOption);
 426         Map<String, Serializable> leaves = new HashMap<>();
 427         if (fragmentEntity.getAttributes() != null) {
 428             leaves = jsonObjectMapper.convertJsonString(fragmentEntity.getAttributes(), Map.class);
 429         }
 430         return new DataNodeBuilder()
 431                 .withXpath(fragmentEntity.getXpath())
 432                 .withLeaves(leaves)
 433                 .withDataspace(fragmentEntity.getAnchor().getDataspace().getName())
 434                 .withAnchor(fragmentEntity.getAnchor().getName())
 435                 .withChildDataNodes(childDataNodes).build();
 436     }
 437
 438     private Collection<DataNode> toDataNodes(final Collection<FragmentEntity> fragmentEntities,
 439                                              final FetchDescendantsOption fetchDescendantsOption) {
 440         final Collection<DataNode> dataNodes = new ArrayList<>(fragmentEntities.size());
 441         for (final FragmentEntity fragmentEntity : fragmentEntities) {
 442             dataNodes.add(toDataNode(fragmentEntity, fetchDescendantsOption));
 443         }
 444         return dataNodes;
 445     }
 446
 447     private List<DataNode> getChildDataNodes(final FragmentEntity fragmentEntity,
 448                                              final FetchDescendantsOption fetchDescendantsOption) {
 449         if (fetchDescendantsOption.hasNext()) {
 450             return fragmentEntity.getChildFragments().stream()
 451                     .map(childFragmentEntity -> toDataNode(childFragmentEntity, fetchDescendantsOption.next()))
 452                     .collect(Collectors.toList());
 453         }
 454         return Collections.emptyList();
 455     }
 456
 457     @Override
 458     public void updateDataLeaves(final String dataspaceName, final String anchorName, final String xpath,
 459                                  final Map<String, Serializable> updateLeaves) {
 460         final AnchorEntity anchorEntity = getAnchorEntity(dataspaceName, anchorName);
 461         final FragmentEntity fragmentEntity = getFragmentEntity(anchorEntity, xpath);
 462         final String currentLeavesAsString = fragmentEntity.getAttributes();
 463         final String mergedLeaves = mergeLeaves(updateLeaves, currentLeavesAsString);
 464         fragmentEntity.setAttributes(mergedLeaves);
 465         fragmentRepository.save(fragmentEntity);
 466     }
 467
 468     @Override
 469     public void updateDataNodesAndDescendants(final String dataspaceName, final String anchorName,
 470                                               final Collection<DataNode> updatedDataNodes) {
 471         final AnchorEntity anchorEntity = getAnchorEntity(dataspaceName, anchorName);
 472
 473         final Map<String, DataNode> xpathToUpdatedDataNode = updatedDataNodes.stream()
 474             .collect(Collectors.toMap(DataNode::getXpath, dataNode -> dataNode));
 475
 476         final Collection<String> xpaths = xpathToUpdatedDataNode.keySet();
 477         final Collection<FragmentEntity> existingFragmentEntities =
 478             getFragmentEntities(anchorEntity, xpaths, FetchDescendantsOption.INCLUDE_ALL_DESCENDANTS);
 479
 480         for (final FragmentEntity existingFragmentEntity : existingFragmentEntities) {
 481             final DataNode updatedDataNode = xpathToUpdatedDataNode.get(existingFragmentEntity.getXpath());
 482             updateFragmentEntityAndDescendantsWithDataNode(existingFragmentEntity, updatedDataNode);
 483         }
 484
 485         try {
 486             fragmentRepository.saveAll(existingFragmentEntities);
 487         } catch (final StaleStateException staleStateException) {
 488             retryUpdateDataNodesIndividually(anchorEntity, existingFragmentEntities);
 489         }
 490     }
 491
 492     private void retryUpdateDataNodesIndividually(final AnchorEntity anchorEntity,
 493                                                   final Collection<FragmentEntity> fragmentEntities) {
 494         final Collection<String> failedXpaths = new HashSet<>();
 495         for (final FragmentEntity dataNodeFragment : fragmentEntities) {
 496             try {
 497                 fragmentRepository.save(dataNodeFragment);
 498             } catch (final StaleStateException e) {
 499                 failedXpaths.add(dataNodeFragment.getXpath());
 500             }
 501         }
 502         if (!failedXpaths.isEmpty()) {
 503             final String failedXpathsConcatenated = String.join(",", failedXpaths);
 504             throw new ConcurrencyException("Concurrent Transactions", String.format(
 505                     "DataNodes : %s in Dataspace :'%s' with Anchor : '%s'  are updated by another transaction.",
 506                     failedXpathsConcatenated, anchorEntity.getDataspace().getName(), anchorEntity.getName()));
 507         }
 508     }
 509
 510     private void updateFragmentEntityAndDescendantsWithDataNode(final FragmentEntity existingFragmentEntity,
 511                                                                 final DataNode newDataNode) {
 512         existingFragmentEntity.setAttributes(jsonObjectMapper.asJsonString(newDataNode.getLeaves()));
 513
 514         final Map<String, FragmentEntity> existingChildrenByXpath = existingFragmentEntity.getChildFragments().stream()
 515                 .collect(Collectors.toMap(FragmentEntity::getXpath, childFragmentEntity -> childFragmentEntity));
 516
 517         final Collection<FragmentEntity> updatedChildFragments = new HashSet<>();
 518         for (final DataNode newDataNodeChild : newDataNode.getChildDataNodes()) {
 519             final FragmentEntity childFragment;
 520             if (isNewDataNode(newDataNodeChild, existingChildrenByXpath)) {
 521                 childFragment = convertToFragmentWithAllDescendants(existingFragmentEntity.getAnchor(),
 522                     newDataNodeChild);
 523             } else {
 524                 childFragment = existingChildrenByXpath.get(newDataNodeChild.getXpath());
 525                 updateFragmentEntityAndDescendantsWithDataNode(childFragment, newDataNodeChild);
 526             }
 527             updatedChildFragments.add(childFragment);
 528         }
 529
 530         existingFragmentEntity.getChildFragments().clear();
 531         existingFragmentEntity.getChildFragments().addAll(updatedChildFragments);
 532     }
 533
 534     @Override
 535     @Transactional
 536     public void replaceListContent(final String dataspaceName, final String anchorName, final String parentNodeXpath,
 537                                    final Collection<DataNode> newListElements) {
 538         final AnchorEntity anchorEntity = getAnchorEntity(dataspaceName, anchorName);
 539         final FragmentEntity parentEntity = getFragmentEntity(anchorEntity, parentNodeXpath);
 540         final String listElementXpathPrefix = getListElementXpathPrefix(newListElements);
 541         final Map<String, FragmentEntity> existingListElementFragmentEntitiesByXPath =
 542                 extractListElementFragmentEntitiesByXPath(parentEntity.getChildFragments(), listElementXpathPrefix);
 543         parentEntity.getChildFragments().removeAll(existingListElementFragmentEntitiesByXPath.values());
 544         final Set<FragmentEntity> updatedChildFragmentEntities = new HashSet<>();
 545         for (final DataNode newListElement : newListElements) {
 546             final FragmentEntity existingListElementEntity =
 547                     existingListElementFragmentEntitiesByXPath.get(newListElement.getXpath());
 548             final FragmentEntity entityToBeAdded = getFragmentForReplacement(parentEntity, newListElement,
 549                     existingListElementEntity);
 550             updatedChildFragmentEntities.add(entityToBeAdded);
 551         }
 552         parentEntity.getChildFragments().addAll(updatedChildFragmentEntities);
 553         fragmentRepository.save(parentEntity);
 554     }
 555
 556     @Override
 557     @Transactional
 558     public void deleteDataNodes(final String dataspaceName, final String anchorName) {
 559         final DataspaceEntity dataspaceEntity = dataspaceRepository.getByName(dataspaceName);
 560         anchorRepository.findByDataspaceAndName(dataspaceEntity, anchorName)
 561             .ifPresent(anchorEntity -> fragmentRepository.deleteByAnchorIn(Collections.singletonList(anchorEntity)));
 562     }
 563
 564     @Override
 565     @Transactional
 566     public void deleteDataNodes(final String dataspaceName, final Collection<String> anchorNames) {
 567         final DataspaceEntity dataspaceEntity = dataspaceRepository.getByName(dataspaceName);
 568         final Collection<AnchorEntity> anchorEntities =
 569             anchorRepository.findAllByDataspaceAndNameIn(dataspaceEntity, anchorNames);
 570         fragmentRepository.deleteByAnchorIn(anchorEntities);
 571     }
 572
 573     @Override
 574     @Transactional
 575     public void deleteDataNodes(final String dataspaceName, final String anchorName,
 576                                 final Collection<String> xpathsToDelete) {
 577         deleteDataNodes(dataspaceName, anchorName, xpathsToDelete, false);
 578     }
 579
 580     private void deleteDataNodes(final String dataspaceName, final String anchorName,
 581                                  final Collection<String> xpathsToDelete, final boolean onlySupportListDeletion) {
 582         final boolean haveRootXpath = xpathsToDelete.stream().anyMatch(CpsDataPersistenceServiceImpl::isRootXpath);
 583         if (haveRootXpath) {
 584             deleteDataNodes(dataspaceName, anchorName);
 585             return;
 586         }
 587
 588         final AnchorEntity anchorEntity = getAnchorEntity(dataspaceName, anchorName);
 589
 590         final Collection<String> deleteChecklist = new HashSet<>(xpathsToDelete.size());
 591         for (final String xpath : xpathsToDelete) {
 592             try {
 593                 deleteChecklist.add(CpsPathUtil.getNormalizedXpath(xpath));
 594             } catch (final PathParsingException e) {
 595                 log.warn("Error parsing xpath \"{}\": {}", xpath, e.getMessage());
 596             }
 597         }
 598
 599         final Collection<String> xpathsToExistingContainers =
 600             fragmentRepository.findAllXpathByAnchorAndXpathIn(anchorEntity, deleteChecklist);
 601         if (onlySupportListDeletion) {
 602             final Collection<String> xpathsToExistingListElements = xpathsToExistingContainers.stream()
 603                 .filter(CpsPathUtil::isPathToListElement).collect(Collectors.toList());
 604             deleteChecklist.removeAll(xpathsToExistingListElements);
 605         } else {
 606             deleteChecklist.removeAll(xpathsToExistingContainers);
 607         }
 608
 609         final Collection<String> xpathsToExistingLists = deleteChecklist.stream()
 610             .filter(xpath -> fragmentRepository.existsByAnchorAndXpathStartsWith(anchorEntity, xpath + "["))
 611             .collect(Collectors.toList());
 612         deleteChecklist.removeAll(xpathsToExistingLists);
 613
 614         if (!deleteChecklist.isEmpty()) {
 615             throw new DataNodeNotFoundExceptionBatch(dataspaceName, anchorName, deleteChecklist);
 616         }
 617
 618         fragmentRepository.deleteByAnchorIdAndXpaths(anchorEntity.getId(), xpathsToExistingContainers);
 619         fragmentRepository.deleteListsByAnchorIdAndXpaths(anchorEntity.getId(), xpathsToExistingLists);
 620     }
 621
 622     @Override
 623     @Transactional
 624     public void deleteListDataNode(final String dataspaceName, final String anchorName,
 625                                    final String targetXpath) {
 626         deleteDataNode(dataspaceName, anchorName, targetXpath, true);
 627     }
 628
 629     @Override
 630     @Transactional
 631     public void deleteDataNode(final String dataspaceName, final String anchorName, final String targetXpath) {
 632         deleteDataNode(dataspaceName, anchorName, targetXpath, false);
 633     }
 634
 635     private void deleteDataNode(final String dataspaceName, final String anchorName, final String targetXpath,
 636                                 final boolean onlySupportListNodeDeletion) {
 637         final String normalizedXpath = getNormalizedXpath(targetXpath);
 638         try {
 639             deleteDataNodes(dataspaceName, anchorName, Collections.singletonList(normalizedXpath),
 640                 onlySupportListNodeDeletion);
 641         } catch (final DataNodeNotFoundExceptionBatch dataNodeNotFoundExceptionBatch) {
 642             throw new DataNodeNotFoundException(dataspaceName, anchorName, targetXpath);
 643         }
 644     }
 645
 646     private static String getListElementXpathPrefix(final Collection<DataNode> newListElements) {
 647         if (newListElements.isEmpty()) {
 648             throw new CpsAdminException("Invalid list replacement",
 649                     "Cannot replace list elements with empty collection");
 650         }
 651         final String firstChildNodeXpath = newListElements.iterator().next().getXpath();
 652         return firstChildNodeXpath.substring(0, firstChildNodeXpath.lastIndexOf('[') + 1);
 653     }
 654
 655     private FragmentEntity getFragmentForReplacement(final FragmentEntity parentEntity,
 656                                                      final DataNode newListElement,
 657                                                      final FragmentEntity existingListElementEntity) {
 658         if (existingListElementEntity == null) {
 659             return convertToFragmentWithAllDescendants(parentEntity.getAnchor(), newListElement);
 660         }
 661         if (newListElement.getChildDataNodes().isEmpty()) {
 662             copyAttributesFromNewListElement(existingListElementEntity, newListElement);
 663             existingListElementEntity.getChildFragments().clear();
 664         } else {
 665             updateFragmentEntityAndDescendantsWithDataNode(existingListElementEntity, newListElement);
 666         }
 667         return existingListElementEntity;
 668     }
 669
 670     private static boolean isNewDataNode(final DataNode replacementDataNode,
 671                                          final Map<String, FragmentEntity> existingListElementsByXpath) {
 672         return !existingListElementsByXpath.containsKey(replacementDataNode.getXpath());
 673     }
 674
 675     private void copyAttributesFromNewListElement(final FragmentEntity existingListElementEntity,
 676                                                   final DataNode newListElement) {
 677         final FragmentEntity replacementFragmentEntity =
 678                 FragmentEntity.builder().attributes(jsonObjectMapper.asJsonString(
 679                         newListElement.getLeaves())).build();
 680         existingListElementEntity.setAttributes(replacementFragmentEntity.getAttributes());
 681     }
 682
 683     private static Map<String, FragmentEntity> extractListElementFragmentEntitiesByXPath(
 684             final Set<FragmentEntity> childEntities, final String listElementXpathPrefix) {
 685         return childEntities.stream()
 686                 .filter(fragmentEntity -> fragmentEntity.getXpath().startsWith(listElementXpathPrefix))
 687                 .collect(Collectors.toMap(FragmentEntity::getXpath, fragmentEntity -> fragmentEntity));
 688     }
 689
 690     private static boolean isRootXpath(final String xpath) {
 691         return "/".equals(xpath) || "".equals(xpath);
 692     }
 693
 694     private String mergeLeaves(final Map<String, Serializable> updateLeaves, final String currentLeavesAsString) {
 695         final Map<String, Serializable> currentLeavesAsMap = currentLeavesAsString.isEmpty()
 696             ? new HashMap<>() : jsonObjectMapper.convertJsonString(currentLeavesAsString, Map.class);
 697         currentLeavesAsMap.putAll(updateLeaves);
 698         if (currentLeavesAsMap.isEmpty()) {
 699             return "";
 700         }
 701         return jsonObjectMapper.asJsonString(currentLeavesAsMap);
 702     }
 703
 704     private AnchorEntity getAnchorEntity(final String dataspaceName, final String anchorName) {
 705         final DataspaceEntity dataspaceEntity = dataspaceRepository.getByName(dataspaceName);
 706         return anchorRepository.getByDataspaceAndName(dataspaceEntity, anchorName);
 707     }
 708 }