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.FragmentQueryBuilder;
  65 import org.onap.cps.spi.repository.FragmentRepository;
  66 import org.onap.cps.spi.utils.SessionManager;
  67 import org.onap.cps.utils.JsonObjectMapper;
  68 import org.springframework.dao.DataIntegrityViolationException;
  69 import org.springframework.stereotype.Service;
  70
  71 @Service
  72 @Slf4j
  73 @RequiredArgsConstructor
  74 public class CpsDataPersistenceServiceImpl implements CpsDataPersistenceService {
  75
  76     private final DataspaceRepository dataspaceRepository;
  77     private final AnchorRepository anchorRepository;
  78     private final FragmentRepository fragmentRepository;
  79     private final JsonObjectMapper jsonObjectMapper;
  80     private final SessionManager sessionManager;
  81
  82     private static final String REG_EX_FOR_OPTIONAL_LIST_INDEX = "(\\[@[\\s\\S]+?]){0,1})";
  83
  84     @Override
  85     public void addChildDataNode(final String dataspaceName, final String anchorName, final String parentNodeXpath,
  86                                  final DataNode newChildDataNode) {
  87         addNewChildDataNode(dataspaceName, anchorName, parentNodeXpath, newChildDataNode);
  88     }
  89
  90     @Override
  91     public void addChildDataNodes(final String dataspaceName, final String anchorName,
  92                                   final String parentNodeXpath, final Collection<DataNode> dataNodes) {
  93         addChildrenDataNodes(dataspaceName, anchorName, parentNodeXpath, dataNodes);
  94     }
  95
  96     @Override
  97     public void addListElements(final String dataspaceName, final String anchorName, final String parentNodeXpath,
  98                                 final Collection<DataNode> newListElements) {
  99         addChildrenDataNodes(dataspaceName, anchorName, parentNodeXpath, newListElements);
 100     }
 101
 102     @Override
 103     public void addMultipleLists(final String dataspaceName, final String anchorName, final String parentNodeXpath,
 104                                  final Collection<Collection<DataNode>> newLists) {
 105         final Collection<String> failedXpaths = new HashSet<>();
 106         newLists.forEach(newList -> {
 107             try {
 108                 addChildrenDataNodes(dataspaceName, anchorName, parentNodeXpath, newList);
 109             } catch (final AlreadyDefinedExceptionBatch e) {
 110                 failedXpaths.addAll(e.getAlreadyDefinedXpaths());
 111             }
 112         });
 113
 114         if (!failedXpaths.isEmpty()) {
 115             throw new AlreadyDefinedExceptionBatch(failedXpaths);
 116         }
 117
 118     }
 119
 120     private void addNewChildDataNode(final String dataspaceName, final String anchorName,
 121                                      final String parentNodeXpath, final DataNode newChild) {
 122         final FragmentEntity parentFragmentEntity =
 123             getFragmentWithoutDescendantsByXpath(dataspaceName, anchorName, parentNodeXpath);
 124         final FragmentEntity newChildAsFragmentEntity =
 125                 convertToFragmentWithAllDescendants(parentFragmentEntity.getDataspace(),
 126                         parentFragmentEntity.getAnchor(), newChild);
 127         newChildAsFragmentEntity.setParentId(parentFragmentEntity.getId());
 128         try {
 129             fragmentRepository.save(newChildAsFragmentEntity);
 130         } catch (final DataIntegrityViolationException e) {
 131             throw AlreadyDefinedException.forDataNode(newChild.getXpath(), anchorName, e);
 132         }
 133
 134     }
 135
 136     private void addChildrenDataNodes(final String dataspaceName, final String anchorName, final String parentNodeXpath,
 137                                       final Collection<DataNode> newChildren) {
 138         final FragmentEntity parentFragmentEntity =
 139             getFragmentWithoutDescendantsByXpath(dataspaceName, anchorName, parentNodeXpath);
 140         final List<FragmentEntity> fragmentEntities = new ArrayList<>(newChildren.size());
 141         try {
 142             newChildren.forEach(newChildAsDataNode -> {
 143                 final FragmentEntity newChildAsFragmentEntity =
 144                         convertToFragmentWithAllDescendants(parentFragmentEntity.getDataspace(),
 145                                 parentFragmentEntity.getAnchor(), newChildAsDataNode);
 146                 newChildAsFragmentEntity.setParentId(parentFragmentEntity.getId());
 147                 fragmentEntities.add(newChildAsFragmentEntity);
 148             });
 149             fragmentRepository.saveAll(fragmentEntities);
 150         } catch (final DataIntegrityViolationException e) {
 151             log.warn("Exception occurred : {} , While saving : {} children, retrying using individual save operations",
 152                     e, fragmentEntities.size());
 153             retrySavingEachChildIndividually(dataspaceName, anchorName, parentNodeXpath, newChildren);
 154         }
 155     }
 156
 157     private void retrySavingEachChildIndividually(final String dataspaceName, final String anchorName,
 158                                                   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(dataspaceName, anchorName, 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 DataspaceEntity dataspaceEntity = dataspaceRepository.getByName(dataspaceName);
 182         final AnchorEntity anchorEntity = anchorRepository.getByDataspaceAndName(dataspaceEntity, anchorName);
 183         final List<FragmentEntity> fragmentEntities = new ArrayList<>(dataNodes.size());
 184         try {
 185             for (final DataNode dataNode: dataNodes) {
 186                 final FragmentEntity fragmentEntity = convertToFragmentWithAllDescendants(dataspaceEntity, anchorEntity,
 187                         dataNode);
 188                 fragmentEntities.add(fragmentEntity);
 189             }
 190             fragmentRepository.saveAll(fragmentEntities);
 191         } catch (final DataIntegrityViolationException exception) {
 192             log.warn("Exception occurred : {} , While saving : {} data nodes, Retrying saving data nodes individually",
 193                     exception, dataNodes.size());
 194             storeDataNodesIndividually(dataspaceName, anchorName, dataNodes);
 195         }
 196     }
 197
 198     private void storeDataNodesIndividually(final String dataspaceName, final String anchorName,
 199                                            final Collection<DataNode> dataNodes) {
 200         final DataspaceEntity dataspaceEntity = dataspaceRepository.getByName(dataspaceName);
 201         final AnchorEntity anchorEntity = anchorRepository.getByDataspaceAndName(dataspaceEntity, anchorName);
 202         final Collection<String> failedXpaths = new HashSet<>();
 203         for (final DataNode dataNode: dataNodes) {
 204             try {
 205                 final FragmentEntity fragmentEntity = convertToFragmentWithAllDescendants(dataspaceEntity, anchorEntity,
 206                         dataNode);
 207                 fragmentRepository.save(fragmentEntity);
 208             } catch (final DataIntegrityViolationException e) {
 209                 failedXpaths.add(dataNode.getXpath());
 210             }
 211         }
 212         if (!failedXpaths.isEmpty()) {
 213             throw new AlreadyDefinedExceptionBatch(failedXpaths);
 214         }
 215     }
 216
 217     /**
 218      * Convert DataNode object into Fragment and places the result in the fragments placeholder. Performs same action
 219      * for all DataNode children recursively.
 220      *
 221      * @param dataspaceEntity       dataspace
 222      * @param anchorEntity          anchorEntity
 223      * @param dataNodeToBeConverted dataNode
 224      * @return a Fragment built from current DataNode
 225      */
 226     private FragmentEntity convertToFragmentWithAllDescendants(final DataspaceEntity dataspaceEntity,
 227                                                                final AnchorEntity anchorEntity,
 228                                                                final DataNode dataNodeToBeConverted) {
 229         final FragmentEntity parentFragment = toFragmentEntity(dataspaceEntity, anchorEntity, dataNodeToBeConverted);
 230         final Builder<FragmentEntity> childFragmentsImmutableSetBuilder = ImmutableSet.builder();
 231         for (final DataNode childDataNode : dataNodeToBeConverted.getChildDataNodes()) {
 232             final FragmentEntity childFragment =
 233                     convertToFragmentWithAllDescendants(parentFragment.getDataspace(), parentFragment.getAnchor(),
 234                             childDataNode);
 235             childFragmentsImmutableSetBuilder.add(childFragment);
 236         }
 237         parentFragment.setChildFragments(childFragmentsImmutableSetBuilder.build());
 238         return parentFragment;
 239     }
 240
 241     private FragmentEntity toFragmentEntity(final DataspaceEntity dataspaceEntity,
 242                                             final AnchorEntity anchorEntity, final DataNode dataNode) {
 243         return FragmentEntity.builder()
 244                 .dataspace(dataspaceEntity)
 245                 .anchor(anchorEntity)
 246                 .xpath(dataNode.getXpath())
 247                 .attributes(jsonObjectMapper.asJsonString(dataNode.getLeaves()))
 248                 .build();
 249     }
 250
 251     @Override
 252     public DataNode getDataNode(final String dataspaceName, final String anchorName, final String xpath,
 253                                 final FetchDescendantsOption fetchDescendantsOption) {
 254         final FragmentEntity fragmentEntity = getFragmentByXpath(dataspaceName, anchorName, xpath,
 255             fetchDescendantsOption);
 256         return toDataNode(fragmentEntity, fetchDescendantsOption);
 257     }
 258
 259     private FragmentEntity getFragmentWithoutDescendantsByXpath(final String dataspaceName,
 260                                                                 final String anchorName,
 261                                                                 final String xpath) {
 262         return getFragmentByXpath(dataspaceName, anchorName, xpath, FetchDescendantsOption.OMIT_DESCENDANTS);
 263     }
 264
 265     private FragmentEntity getFragmentByXpath(final String dataspaceName, final String anchorName,
 266                                               final String xpath, final FetchDescendantsOption fetchDescendantsOption) {
 267         final DataspaceEntity dataspaceEntity = dataspaceRepository.getByName(dataspaceName);
 268         final AnchorEntity anchorEntity = anchorRepository.getByDataspaceAndName(dataspaceEntity, anchorName);
 269         final FragmentEntity fragmentEntity;
 270         if (isRootXpath(xpath)) {
 271             final List<FragmentExtract> fragmentExtracts = fragmentRepository.getTopLevelFragments(dataspaceEntity,
 272                     anchorEntity);
 273             fragmentEntity = FragmentEntityArranger.toFragmentEntityTrees(anchorEntity, fragmentExtracts)
 274                 .stream().findFirst().orElse(null);
 275         } else {
 276             final String normalizedXpath = getNormalizedXpath(xpath);
 277             if (FetchDescendantsOption.OMIT_DESCENDANTS.equals(fetchDescendantsOption)) {
 278                 fragmentEntity =
 279                     fragmentRepository.getByDataspaceAndAnchorAndXpath(dataspaceEntity, anchorEntity, normalizedXpath);
 280             } else {
 281                 fragmentEntity = buildFragmentEntitiesFromFragmentExtracts(anchorEntity, normalizedXpath)
 282                     .stream().findFirst().orElse(null);
 283             }
 284         }
 285         if (fragmentEntity == null) {
 286             throw new DataNodeNotFoundException(dataspaceEntity.getName(), anchorEntity.getName(), xpath);
 287         }
 288         return fragmentEntity;
 289
 290     }
 291
 292     private Collection<FragmentEntity> buildFragmentEntitiesFromFragmentExtracts(final AnchorEntity anchorEntity,
 293                                                                                  final String normalizedXpath) {
 294         final List<FragmentExtract> fragmentExtracts =
 295                 fragmentRepository.findByAnchorIdAndParentXpath(anchorEntity.getId(), normalizedXpath);
 296         log.debug("Fetched {} fragment entities by anchor {} and cps path {}.",
 297                 fragmentExtracts.size(), anchorEntity.getName(), normalizedXpath);
 298         return FragmentEntityArranger.toFragmentEntityTrees(anchorEntity, fragmentExtracts);
 299
 300     }
 301
 302     @Override
 303     public List<DataNode> queryDataNodes(final String dataspaceName, final String anchorName, final String cpsPath,
 304                                          final FetchDescendantsOption fetchDescendantsOption) {
 305         final DataspaceEntity dataspaceEntity = dataspaceRepository.getByName(dataspaceName);
 306         final AnchorEntity anchorEntity = anchorRepository.getByDataspaceAndName(dataspaceEntity, anchorName);
 307         final CpsPathQuery cpsPathQuery;
 308         try {
 309             cpsPathQuery = CpsPathUtil.getCpsPathQuery(cpsPath);
 310         } catch (final PathParsingException e) {
 311             throw new CpsPathException(e.getMessage());
 312         }
 313
 314         Collection<FragmentEntity> fragmentEntities;
 315         if (canUseRegexQuickFind(fetchDescendantsOption, cpsPathQuery)) {
 316             return getDataNodesUsingRegexQuickFind(fetchDescendantsOption, anchorEntity, cpsPathQuery);
 317         }
 318         fragmentEntities = fragmentRepository.findByAnchorAndCpsPath(anchorEntity.getId(), cpsPathQuery);
 319         if (cpsPathQuery.hasAncestorAxis()) {
 320             fragmentEntities = getAncestorFragmentEntities(anchorEntity, cpsPathQuery, fragmentEntities);
 321         }
 322         return createDataNodesFromProxiedFragmentEntities(fetchDescendantsOption, anchorEntity, fragmentEntities);
 323     }
 324
 325     private static boolean canUseRegexQuickFind(final FetchDescendantsOption fetchDescendantsOption,
 326                                                 final CpsPathQuery cpsPathQuery) {
 327         return fetchDescendantsOption.equals(FetchDescendantsOption.INCLUDE_ALL_DESCENDANTS)
 328             && !cpsPathQuery.hasLeafConditions()
 329             && !cpsPathQuery.hasTextFunctionCondition();
 330     }
 331
 332     private List<DataNode> getDataNodesUsingRegexQuickFind(final FetchDescendantsOption fetchDescendantsOption,
 333                                                            final AnchorEntity anchorEntity,
 334                                                            final CpsPathQuery cpsPathQuery) {
 335         Collection<FragmentEntity> fragmentEntities;
 336         final String xpathRegex = FragmentQueryBuilder.getXpathSqlRegex(cpsPathQuery, true);
 337         final List<FragmentExtract> fragmentExtracts =
 338             fragmentRepository.quickFindWithDescendants(anchorEntity.getId(), xpathRegex);
 339         fragmentEntities = FragmentEntityArranger.toFragmentEntityTrees(anchorEntity, fragmentExtracts);
 340         if (cpsPathQuery.hasAncestorAxis()) {
 341             fragmentEntities = getAncestorFragmentEntities(anchorEntity, cpsPathQuery, fragmentEntities);
 342         }
 343         return createDataNodesFromFragmentEntities(fetchDescendantsOption, fragmentEntities);
 344     }
 345
 346     private Collection<FragmentEntity> getAncestorFragmentEntities(final AnchorEntity anchorEntity,
 347                                                                    final CpsPathQuery cpsPathQuery,
 348                                                                    Collection<FragmentEntity> fragmentEntities) {
 349         final Set<String> ancestorXpaths = processAncestorXpath(fragmentEntities, cpsPathQuery);
 350         fragmentEntities = ancestorXpaths.isEmpty() ? Collections.emptyList()
 351             : fragmentRepository.findAllByAnchorAndXpathIn(anchorEntity, ancestorXpaths);
 352         return fragmentEntities;
 353     }
 354
 355     private List<DataNode> createDataNodesFromProxiedFragmentEntities(
 356                                             final FetchDescendantsOption fetchDescendantsOption,
 357                                             final AnchorEntity anchorEntity,
 358                                             final Collection<FragmentEntity> proxiedFragmentEntities) {
 359         final List<DataNode> dataNodes = new ArrayList<>(proxiedFragmentEntities.size());
 360         for (final FragmentEntity proxiedFragmentEntity : proxiedFragmentEntities) {
 361             if (FetchDescendantsOption.OMIT_DESCENDANTS.equals(fetchDescendantsOption)) {
 362                 dataNodes.add(toDataNode(proxiedFragmentEntity, fetchDescendantsOption));
 363             } else {
 364                 final String normalizedXpath = getNormalizedXpath(proxiedFragmentEntity.getXpath());
 365                 final Collection<FragmentEntity> unproxiedFragmentEntities =
 366                     buildFragmentEntitiesFromFragmentExtracts(anchorEntity, normalizedXpath);
 367                 for (final FragmentEntity unproxiedFragmentEntity : unproxiedFragmentEntities) {
 368                     dataNodes.add(toDataNode(unproxiedFragmentEntity, fetchDescendantsOption));
 369                 }
 370             }
 371         }
 372         return Collections.unmodifiableList(dataNodes);
 373     }
 374
 375     private List<DataNode> createDataNodesFromFragmentEntities(final FetchDescendantsOption fetchDescendantsOption,
 376                                                                final Collection<FragmentEntity> fragmentEntities) {
 377         final List<DataNode> dataNodes = new ArrayList<>(fragmentEntities.size());
 378         for (final FragmentEntity fragmentEntity : fragmentEntities) {
 379             dataNodes.add(toDataNode(fragmentEntity, fetchDescendantsOption));
 380         }
 381         return Collections.unmodifiableList(dataNodes);
 382     }
 383
 384     private static String getNormalizedXpath(final String xpathSource) {
 385         final String normalizedXpath;
 386         try {
 387             normalizedXpath = CpsPathUtil.getNormalizedXpath(xpathSource);
 388         } catch (final PathParsingException e) {
 389             throw new CpsPathException(e.getMessage());
 390         }
 391         return normalizedXpath;
 392     }
 393
 394     @Override
 395     public String startSession() {
 396         return sessionManager.startSession();
 397     }
 398
 399     @Override
 400     public void closeSession(final String sessionId) {
 401         sessionManager.closeSession(sessionId, SessionManager.WITH_COMMIT);
 402     }
 403
 404     @Override
 405     public void lockAnchor(final String sessionId, final String dataspaceName,
 406                            final String anchorName, final Long timeoutInMilliseconds) {
 407         sessionManager.lockAnchor(sessionId, dataspaceName, anchorName, timeoutInMilliseconds);
 408     }
 409
 410     private static Set<String> processAncestorXpath(final Collection<FragmentEntity> fragmentEntities,
 411                                                     final CpsPathQuery cpsPathQuery) {
 412         final Set<String> ancestorXpath = new HashSet<>();
 413         final Pattern pattern =
 414                 Pattern.compile("([\\s\\S]*\\/" + Pattern.quote(cpsPathQuery.getAncestorSchemaNodeIdentifier())
 415                         + REG_EX_FOR_OPTIONAL_LIST_INDEX + "\\/[\\s\\S]*");
 416         for (final FragmentEntity fragmentEntity : fragmentEntities) {
 417             final Matcher matcher = pattern.matcher(fragmentEntity.getXpath());
 418             if (matcher.matches()) {
 419                 ancestorXpath.add(matcher.group(1));
 420             }
 421         }
 422         return ancestorXpath;
 423     }
 424
 425     private DataNode toDataNode(final FragmentEntity fragmentEntity,
 426                                 final FetchDescendantsOption fetchDescendantsOption) {
 427         final List<DataNode> childDataNodes = getChildDataNodes(fragmentEntity, fetchDescendantsOption);
 428         Map<String, Serializable> leaves = new HashMap<>();
 429         if (fragmentEntity.getAttributes() != null) {
 430             leaves = jsonObjectMapper.convertJsonString(fragmentEntity.getAttributes(), Map.class);
 431         }
 432         return new DataNodeBuilder()
 433                 .withXpath(fragmentEntity.getXpath())
 434                 .withLeaves(leaves)
 435                 .withChildDataNodes(childDataNodes).build();
 436     }
 437
 438     private List<DataNode> getChildDataNodes(final FragmentEntity fragmentEntity,
 439                                              final FetchDescendantsOption fetchDescendantsOption) {
 440         if (fetchDescendantsOption.hasNext()) {
 441             return fragmentEntity.getChildFragments().stream()
 442                     .map(childFragmentEntity -> toDataNode(childFragmentEntity, fetchDescendantsOption.next()))
 443                     .collect(Collectors.toList());
 444         }
 445         return Collections.emptyList();
 446     }
 447
 448     @Override
 449     public void updateDataLeaves(final String dataspaceName, final String anchorName, final String xpath,
 450                                  final Map<String, Serializable> leaves) {
 451         final FragmentEntity fragmentEntity = getFragmentWithoutDescendantsByXpath(dataspaceName, anchorName, xpath);
 452         fragmentEntity.setAttributes(jsonObjectMapper.asJsonString(leaves));
 453         fragmentRepository.save(fragmentEntity);
 454     }
 455
 456     @Override
 457     public void updateDataNodeAndDescendants(final String dataspaceName, final String anchorName,
 458                                              final DataNode dataNode) {
 459         final FragmentEntity fragmentEntity =
 460             getFragmentWithoutDescendantsByXpath(dataspaceName, anchorName, dataNode.getXpath());
 461         updateFragmentEntityAndDescendantsWithDataNode(fragmentEntity, dataNode);
 462         try {
 463             fragmentRepository.save(fragmentEntity);
 464         } catch (final StaleStateException staleStateException) {
 465             throw new ConcurrencyException("Concurrent Transactions",
 466                     String.format("dataspace :'%s', Anchor : '%s' and xpath: '%s' is updated by another transaction.",
 467                             dataspaceName, anchorName, dataNode.getXpath()));
 468         }
 469     }
 470
 471     @Override
 472     public void updateDataNodesAndDescendants(final String dataspaceName,
 473                                               final String anchorName,
 474                                               final List<DataNode> dataNodes) {
 475
 476         final Map<DataNode, FragmentEntity> dataNodeFragmentEntityMap = dataNodes.stream()
 477                 .collect(Collectors.toMap(
 478                         dataNode -> dataNode,
 479                         dataNode ->
 480                             getFragmentWithoutDescendantsByXpath(dataspaceName, anchorName, dataNode.getXpath())));
 481         dataNodeFragmentEntityMap.forEach(
 482                 (dataNode, fragmentEntity) -> updateFragmentEntityAndDescendantsWithDataNode(fragmentEntity, dataNode));
 483         try {
 484             fragmentRepository.saveAll(dataNodeFragmentEntityMap.values());
 485         } catch (final StaleStateException staleStateException) {
 486             retryUpdateDataNodesIndividually(dataspaceName, anchorName, dataNodeFragmentEntityMap.values());
 487         }
 488     }
 489
 490     private void retryUpdateDataNodesIndividually(final String dataspaceName, final String anchorName,
 491                                                   final Collection<FragmentEntity> fragmentEntities) {
 492         final Collection<String> failedXpaths = new HashSet<>();
 493
 494         fragmentEntities.forEach(dataNodeFragment -> {
 495             try {
 496                 fragmentRepository.save(dataNodeFragment);
 497             } catch (final StaleStateException e) {
 498                 failedXpaths.add(dataNodeFragment.getXpath());
 499             }
 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, dataspaceName, anchorName));
 507         }
 508     }
 509
 510     private void updateFragmentEntityAndDescendantsWithDataNode(final FragmentEntity existingFragmentEntity,
 511                                                                 final DataNode newDataNode) {
 512
 513         existingFragmentEntity.setAttributes(jsonObjectMapper.asJsonString(newDataNode.getLeaves()));
 514
 515         final Map<String, FragmentEntity> existingChildrenByXpath = existingFragmentEntity.getChildFragments().stream()
 516                 .collect(Collectors.toMap(FragmentEntity::getXpath, childFragmentEntity -> childFragmentEntity));
 517
 518         final Collection<FragmentEntity> updatedChildFragments = new HashSet<>();
 519
 520         for (final DataNode newDataNodeChild : newDataNode.getChildDataNodes()) {
 521             final FragmentEntity childFragment;
 522             if (isNewDataNode(newDataNodeChild, existingChildrenByXpath)) {
 523                 childFragment = convertToFragmentWithAllDescendants(
 524                         existingFragmentEntity.getDataspace(), existingFragmentEntity.getAnchor(), newDataNodeChild);
 525             } else {
 526                 childFragment = existingChildrenByXpath.get(newDataNodeChild.getXpath());
 527                 updateFragmentEntityAndDescendantsWithDataNode(childFragment, newDataNodeChild);
 528             }
 529             updatedChildFragments.add(childFragment);
 530         }
 531
 532         existingFragmentEntity.getChildFragments().clear();
 533         existingFragmentEntity.getChildFragments().addAll(updatedChildFragments);
 534     }
 535
 536     @Override
 537     @Transactional
 538     public void replaceListContent(final String dataspaceName, final String anchorName, final String parentNodeXpath,
 539                                    final Collection<DataNode> newListElements) {
 540         final FragmentEntity parentEntity =
 541             getFragmentWithoutDescendantsByXpath(dataspaceName, anchorName, parentNodeXpath);
 542         final String listElementXpathPrefix = getListElementXpathPrefix(newListElements);
 543         final Map<String, FragmentEntity> existingListElementFragmentEntitiesByXPath =
 544                 extractListElementFragmentEntitiesByXPath(parentEntity.getChildFragments(), listElementXpathPrefix);
 545         deleteListElements(parentEntity.getChildFragments(), existingListElementFragmentEntitiesByXPath);
 546         final Set<FragmentEntity> updatedChildFragmentEntities = new HashSet<>();
 547         for (final DataNode newListElement : newListElements) {
 548             final FragmentEntity existingListElementEntity =
 549                     existingListElementFragmentEntitiesByXPath.get(newListElement.getXpath());
 550             final FragmentEntity entityToBeAdded = getFragmentForReplacement(parentEntity, newListElement,
 551                     existingListElementEntity);
 552
 553             updatedChildFragmentEntities.add(entityToBeAdded);
 554         }
 555         parentEntity.getChildFragments().addAll(updatedChildFragmentEntities);
 556         fragmentRepository.save(parentEntity);
 557     }
 558
 559     @Override
 560     @Transactional
 561     public void deleteDataNodes(final String dataspaceName, final String anchorName) {
 562         final DataspaceEntity dataspaceEntity = dataspaceRepository.getByName(dataspaceName);
 563         anchorRepository.findByDataspaceAndName(dataspaceEntity, anchorName)
 564                 .ifPresent(
 565                         anchorEntity -> fragmentRepository.deleteByAnchorIn(Set.of(anchorEntity)));
 566     }
 567
 568     @Override
 569     @Transactional
 570     public void deleteListDataNode(final String dataspaceName, final String anchorName,
 571                                    final String targetXpath) {
 572         deleteDataNode(dataspaceName, anchorName, targetXpath, true);
 573     }
 574
 575     @Override
 576     @Transactional
 577     public void deleteDataNode(final String dataspaceName, final String anchorName, final String targetXpath) {
 578         deleteDataNode(dataspaceName, anchorName, targetXpath, false);
 579     }
 580
 581     private void deleteDataNode(final String dataspaceName, final String anchorName, final String targetXpath,
 582                                 final boolean onlySupportListNodeDeletion) {
 583         final String parentNodeXpath;
 584         FragmentEntity parentFragmentEntity = null;
 585         boolean targetDeleted;
 586         if (isRootXpath(targetXpath)) {
 587             deleteDataNodes(dataspaceName, anchorName);
 588             targetDeleted = true;
 589         } else {
 590             if (isRootContainerNodeXpath(targetXpath)) {
 591                 parentNodeXpath = targetXpath;
 592             } else {
 593                 parentNodeXpath = CpsPathUtil.getNormalizedParentXpath(targetXpath);
 594             }
 595             parentFragmentEntity = getFragmentWithoutDescendantsByXpath(dataspaceName, anchorName, parentNodeXpath);
 596             if (CpsPathUtil.isPathToListElement(targetXpath)) {
 597                 targetDeleted = deleteDataNode(parentFragmentEntity, targetXpath);
 598             } else {
 599                 targetDeleted = deleteAllListElements(parentFragmentEntity, targetXpath);
 600                 final boolean tryToDeleteDataNode = !targetDeleted && !onlySupportListNodeDeletion;
 601                 if (tryToDeleteDataNode) {
 602                     targetDeleted = deleteDataNode(parentFragmentEntity, targetXpath);
 603                 }
 604             }
 605         }
 606         if (!targetDeleted) {
 607             final String additionalInformation = onlySupportListNodeDeletion
 608                     ? "The target is probably not a List." : "";
 609             throw new DataNodeNotFoundException(parentFragmentEntity.getDataspace().getName(),
 610                     parentFragmentEntity.getAnchor().getName(), targetXpath, additionalInformation);
 611         }
 612     }
 613
 614     private boolean deleteDataNode(final FragmentEntity parentFragmentEntity, final String targetXpath) {
 615         final String normalizedTargetXpath = CpsPathUtil.getNormalizedXpath(targetXpath);
 616         if (parentFragmentEntity.getXpath().equals(normalizedTargetXpath)) {
 617             fragmentRepository.delete(parentFragmentEntity);
 618             return true;
 619         }
 620         if (parentFragmentEntity.getChildFragments()
 621                 .removeIf(fragment -> fragment.getXpath().equals(normalizedTargetXpath))) {
 622             fragmentRepository.save(parentFragmentEntity);
 623             return true;
 624         }
 625         return false;
 626     }
 627
 628     private boolean deleteAllListElements(final FragmentEntity parentFragmentEntity, final String listXpath) {
 629         final String normalizedListXpath = CpsPathUtil.getNormalizedXpath(listXpath);
 630         final String deleteTargetXpathPrefix = normalizedListXpath + "[";
 631         if (parentFragmentEntity.getChildFragments()
 632                 .removeIf(fragment -> fragment.getXpath().startsWith(deleteTargetXpathPrefix))) {
 633             fragmentRepository.save(parentFragmentEntity);
 634             return true;
 635         }
 636         return false;
 637     }
 638
 639     private static void deleteListElements(
 640             final Collection<FragmentEntity> fragmentEntities,
 641             final Map<String, FragmentEntity> existingListElementFragmentEntitiesByXPath) {
 642         fragmentEntities.removeAll(existingListElementFragmentEntitiesByXPath.values());
 643     }
 644
 645     private static String getListElementXpathPrefix(final Collection<DataNode> newListElements) {
 646         if (newListElements.isEmpty()) {
 647             throw new CpsAdminException("Invalid list replacement",
 648                     "Cannot replace list elements with empty collection");
 649         }
 650         final String firstChildNodeXpath = newListElements.iterator().next().getXpath();
 651         return firstChildNodeXpath.substring(0, firstChildNodeXpath.lastIndexOf('[') + 1);
 652     }
 653
 654     private FragmentEntity getFragmentForReplacement(final FragmentEntity parentEntity,
 655                                                      final DataNode newListElement,
 656                                                      final FragmentEntity existingListElementEntity) {
 657         if (existingListElementEntity == null) {
 658             return convertToFragmentWithAllDescendants(
 659                     parentEntity.getDataspace(), 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 static boolean isRootContainerNodeXpath(final String xpath) {
 676         return 0 == xpath.lastIndexOf('/');
 677     }
 678
 679     private void copyAttributesFromNewListElement(final FragmentEntity existingListElementEntity,
 680                                                   final DataNode newListElement) {
 681         final FragmentEntity replacementFragmentEntity =
 682                 FragmentEntity.builder().attributes(jsonObjectMapper.asJsonString(
 683                         newListElement.getLeaves())).build();
 684         existingListElementEntity.setAttributes(replacementFragmentEntity.getAttributes());
 685     }
 686
 687     private static Map<String, FragmentEntity> extractListElementFragmentEntitiesByXPath(
 688             final Set<FragmentEntity> childEntities, final String listElementXpathPrefix) {
 689         return childEntities.stream()
 690                 .filter(fragmentEntity -> fragmentEntity.getXpath().startsWith(listElementXpathPrefix))
 691                 .collect(Collectors.toMap(FragmentEntity::getXpath, fragmentEntity -> fragmentEntity));
 692     }
 693
 694     private static boolean isRootXpath(final String xpath) {
 695         return "/".equals(xpath) || "".equals(xpath);
 696     }
 697 }