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 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     @Override
 260     public Collection<DataNode> getDataNodes(final String dataspaceName, final String anchorName,
 261                                              final Collection<String> xpaths,
 262                                              final FetchDescendantsOption fetchDescendantsOption) {
 263         final DataspaceEntity dataspaceEntity = dataspaceRepository.getByName(dataspaceName);
 264         final AnchorEntity anchorEntity = anchorRepository.getByDataspaceAndName(dataspaceEntity, anchorName);
 265
 266         final Set<String> normalizedXpaths = new HashSet<>(xpaths.size());
 267         for (final String xpath : xpaths) {
 268             try {
 269                 normalizedXpaths.add(CpsPathUtil.getNormalizedXpath(xpath));
 270             } catch (final PathParsingException e) {
 271                 log.warn("Error parsing xpath \"{}\" in getDataNodes: {}", xpath, e.getMessage());
 272             }
 273         }
 274
 275         final List<FragmentEntity> fragmentEntities =
 276                 fragmentRepository.findByAnchorAndMultipleCpsPaths(anchorEntity.getId(), normalizedXpaths);
 277         return toDataNodes(fragmentEntities, fetchDescendantsOption);
 278     }
 279
 280     private FragmentEntity getFragmentWithoutDescendantsByXpath(final String dataspaceName,
 281                                                                 final String anchorName,
 282                                                                 final String xpath) {
 283         return getFragmentByXpath(dataspaceName, anchorName, xpath, FetchDescendantsOption.OMIT_DESCENDANTS);
 284     }
 285
 286     private FragmentEntity getFragmentByXpath(final String dataspaceName, final String anchorName,
 287                                               final String xpath, final FetchDescendantsOption fetchDescendantsOption) {
 288         final DataspaceEntity dataspaceEntity = dataspaceRepository.getByName(dataspaceName);
 289         final AnchorEntity anchorEntity = anchorRepository.getByDataspaceAndName(dataspaceEntity, anchorName);
 290         final FragmentEntity fragmentEntity;
 291         if (isRootXpath(xpath)) {
 292             final List<FragmentExtract> fragmentExtracts = fragmentRepository.getTopLevelFragments(dataspaceEntity,
 293                     anchorEntity);
 294             fragmentEntity = FragmentEntityArranger.toFragmentEntityTrees(anchorEntity, fragmentExtracts)
 295                 .stream().findFirst().orElse(null);
 296         } else {
 297             final String normalizedXpath = getNormalizedXpath(xpath);
 298             if (FetchDescendantsOption.OMIT_DESCENDANTS.equals(fetchDescendantsOption)) {
 299                 fragmentEntity =
 300                     fragmentRepository.getByDataspaceAndAnchorAndXpath(dataspaceEntity, anchorEntity, normalizedXpath);
 301             } else {
 302                 fragmentEntity = buildFragmentEntitiesFromFragmentExtracts(anchorEntity, normalizedXpath)
 303                     .stream().findFirst().orElse(null);
 304             }
 305         }
 306         if (fragmentEntity == null) {
 307             throw new DataNodeNotFoundException(dataspaceEntity.getName(), anchorEntity.getName(), xpath);
 308         }
 309         return fragmentEntity;
 310
 311     }
 312
 313     private Collection<FragmentEntity> buildFragmentEntitiesFromFragmentExtracts(final AnchorEntity anchorEntity,
 314                                                                                  final String normalizedXpath) {
 315         final List<FragmentExtract> fragmentExtracts =
 316                 fragmentRepository.findByAnchorIdAndParentXpath(anchorEntity.getId(), normalizedXpath);
 317         log.debug("Fetched {} fragment entities by anchor {} and cps path {}.",
 318                 fragmentExtracts.size(), anchorEntity.getName(), normalizedXpath);
 319         return FragmentEntityArranger.toFragmentEntityTrees(anchorEntity, fragmentExtracts);
 320
 321     }
 322
 323     @Override
 324     public List<DataNode> queryDataNodes(final String dataspaceName, final String anchorName, final String cpsPath,
 325                                          final FetchDescendantsOption fetchDescendantsOption) {
 326         final DataspaceEntity dataspaceEntity = dataspaceRepository.getByName(dataspaceName);
 327         final AnchorEntity anchorEntity = anchorRepository.getByDataspaceAndName(dataspaceEntity, anchorName);
 328         final CpsPathQuery cpsPathQuery;
 329         try {
 330             cpsPathQuery = CpsPathUtil.getCpsPathQuery(cpsPath);
 331         } catch (final PathParsingException e) {
 332             throw new CpsPathException(e.getMessage());
 333         }
 334
 335         Collection<FragmentEntity> fragmentEntities;
 336         if (canUseRegexQuickFind(fetchDescendantsOption, cpsPathQuery)) {
 337             return getDataNodesUsingRegexQuickFind(fetchDescendantsOption, anchorEntity, cpsPathQuery);
 338         }
 339         fragmentEntities = fragmentRepository.findByAnchorAndCpsPath(anchorEntity.getId(), cpsPathQuery);
 340         if (cpsPathQuery.hasAncestorAxis()) {
 341             fragmentEntities = getAncestorFragmentEntities(anchorEntity.getId(), cpsPathQuery, fragmentEntities);
 342         }
 343         return createDataNodesFromProxiedFragmentEntities(fetchDescendantsOption, anchorEntity, fragmentEntities);
 344     }
 345
 346     private static boolean canUseRegexQuickFind(final FetchDescendantsOption fetchDescendantsOption,
 347                                                 final CpsPathQuery cpsPathQuery) {
 348         return fetchDescendantsOption.equals(FetchDescendantsOption.INCLUDE_ALL_DESCENDANTS)
 349             && !cpsPathQuery.hasLeafConditions()
 350             && !cpsPathQuery.hasTextFunctionCondition();
 351     }
 352
 353     private List<DataNode> getDataNodesUsingRegexQuickFind(final FetchDescendantsOption fetchDescendantsOption,
 354                                                            final AnchorEntity anchorEntity,
 355                                                            final CpsPathQuery cpsPathQuery) {
 356         Collection<FragmentEntity> fragmentEntities;
 357         final String xpathRegex = FragmentQueryBuilder.getXpathSqlRegex(cpsPathQuery, true);
 358         final List<FragmentExtract> fragmentExtracts =
 359             fragmentRepository.quickFindWithDescendants(anchorEntity.getId(), xpathRegex);
 360         fragmentEntities = FragmentEntityArranger.toFragmentEntityTrees(anchorEntity, fragmentExtracts);
 361         if (cpsPathQuery.hasAncestorAxis()) {
 362             fragmentEntities = getAncestorFragmentEntities(anchorEntity.getId(), cpsPathQuery, fragmentEntities);
 363         }
 364         return createDataNodesFromFragmentEntities(fetchDescendantsOption, fragmentEntities);
 365     }
 366
 367     private Collection<FragmentEntity> getAncestorFragmentEntities(final int anchorId,
 368                                                                    final CpsPathQuery cpsPathQuery,
 369                                                                    final Collection<FragmentEntity> fragmentEntities) {
 370         final Collection<String> ancestorXpaths = processAncestorXpath(fragmentEntities, cpsPathQuery);
 371         return ancestorXpaths.isEmpty() ? Collections.emptyList()
 372             : fragmentRepository.findByAnchorAndMultipleCpsPaths(anchorId, ancestorXpaths);
 373     }
 374
 375     private List<DataNode> createDataNodesFromProxiedFragmentEntities(
 376                                             final FetchDescendantsOption fetchDescendantsOption,
 377                                             final AnchorEntity anchorEntity,
 378                                             final Collection<FragmentEntity> proxiedFragmentEntities) {
 379         final List<DataNode> dataNodes = new ArrayList<>(proxiedFragmentEntities.size());
 380         for (final FragmentEntity proxiedFragmentEntity : proxiedFragmentEntities) {
 381             if (FetchDescendantsOption.OMIT_DESCENDANTS.equals(fetchDescendantsOption)) {
 382                 dataNodes.add(toDataNode(proxiedFragmentEntity, fetchDescendantsOption));
 383             } else {
 384                 final String normalizedXpath = getNormalizedXpath(proxiedFragmentEntity.getXpath());
 385                 final Collection<FragmentEntity> unproxiedFragmentEntities =
 386                     buildFragmentEntitiesFromFragmentExtracts(anchorEntity, normalizedXpath);
 387                 for (final FragmentEntity unproxiedFragmentEntity : unproxiedFragmentEntities) {
 388                     dataNodes.add(toDataNode(unproxiedFragmentEntity, fetchDescendantsOption));
 389                 }
 390             }
 391         }
 392         return Collections.unmodifiableList(dataNodes);
 393     }
 394
 395     private List<DataNode> createDataNodesFromFragmentEntities(final FetchDescendantsOption fetchDescendantsOption,
 396                                                                final Collection<FragmentEntity> fragmentEntities) {
 397         final List<DataNode> dataNodes = new ArrayList<>(fragmentEntities.size());
 398         for (final FragmentEntity fragmentEntity : fragmentEntities) {
 399             dataNodes.add(toDataNode(fragmentEntity, fetchDescendantsOption));
 400         }
 401         return Collections.unmodifiableList(dataNodes);
 402     }
 403
 404     private static String getNormalizedXpath(final String xpathSource) {
 405         final String normalizedXpath;
 406         try {
 407             normalizedXpath = CpsPathUtil.getNormalizedXpath(xpathSource);
 408         } catch (final PathParsingException e) {
 409             throw new CpsPathException(e.getMessage());
 410         }
 411         return normalizedXpath;
 412     }
 413
 414     @Override
 415     public String startSession() {
 416         return sessionManager.startSession();
 417     }
 418
 419     @Override
 420     public void closeSession(final String sessionId) {
 421         sessionManager.closeSession(sessionId, SessionManager.WITH_COMMIT);
 422     }
 423
 424     @Override
 425     public void lockAnchor(final String sessionId, final String dataspaceName,
 426                            final String anchorName, final Long timeoutInMilliseconds) {
 427         sessionManager.lockAnchor(sessionId, dataspaceName, anchorName, timeoutInMilliseconds);
 428     }
 429
 430     private static Set<String> processAncestorXpath(final Collection<FragmentEntity> fragmentEntities,
 431                                                     final CpsPathQuery cpsPathQuery) {
 432         final Set<String> ancestorXpath = new HashSet<>();
 433         final Pattern pattern =
 434                 Pattern.compile("([\\s\\S]*\\/" + Pattern.quote(cpsPathQuery.getAncestorSchemaNodeIdentifier())
 435                         + REG_EX_FOR_OPTIONAL_LIST_INDEX + "\\/[\\s\\S]*");
 436         for (final FragmentEntity fragmentEntity : fragmentEntities) {
 437             final Matcher matcher = pattern.matcher(fragmentEntity.getXpath());
 438             if (matcher.matches()) {
 439                 ancestorXpath.add(matcher.group(1));
 440             }
 441         }
 442         return ancestorXpath;
 443     }
 444
 445     private DataNode toDataNode(final FragmentEntity fragmentEntity,
 446                                 final FetchDescendantsOption fetchDescendantsOption) {
 447         final List<DataNode> childDataNodes = getChildDataNodes(fragmentEntity, fetchDescendantsOption);
 448         Map<String, Serializable> leaves = new HashMap<>();
 449         if (fragmentEntity.getAttributes() != null) {
 450             leaves = jsonObjectMapper.convertJsonString(fragmentEntity.getAttributes(), Map.class);
 451         }
 452         return new DataNodeBuilder()
 453                 .withXpath(fragmentEntity.getXpath())
 454                 .withLeaves(leaves)
 455                 .withChildDataNodes(childDataNodes).build();
 456     }
 457
 458     private Collection<DataNode> toDataNodes(final Collection<FragmentEntity> fragmentEntities,
 459                                              final FetchDescendantsOption fetchDescendantsOption) {
 460         final Collection<DataNode> dataNodes = new ArrayList<>(fragmentEntities.size());
 461         for (final FragmentEntity fragmentEntity : fragmentEntities) {
 462             dataNodes.add(toDataNode(fragmentEntity, fetchDescendantsOption));
 463         }
 464         return dataNodes;
 465     }
 466
 467     private List<DataNode> getChildDataNodes(final FragmentEntity fragmentEntity,
 468                                              final FetchDescendantsOption fetchDescendantsOption) {
 469         if (fetchDescendantsOption.hasNext()) {
 470             return fragmentEntity.getChildFragments().stream()
 471                     .map(childFragmentEntity -> toDataNode(childFragmentEntity, fetchDescendantsOption.next()))
 472                     .collect(Collectors.toList());
 473         }
 474         return Collections.emptyList();
 475     }
 476
 477     @Override
 478     public void updateDataLeaves(final String dataspaceName, final String anchorName, final String xpath,
 479                                  final Map<String, Serializable> updateLeaves) {
 480         final FragmentEntity fragmentEntity = getFragmentWithoutDescendantsByXpath(dataspaceName, anchorName, xpath);
 481         final String currentLeavesAsString = fragmentEntity.getAttributes();
 482         final String mergedLeaves = mergeLeaves(updateLeaves, currentLeavesAsString);
 483         fragmentEntity.setAttributes(mergedLeaves);
 484         fragmentRepository.save(fragmentEntity);
 485     }
 486
 487     @Override
 488     public void updateDataNodeAndDescendants(final String dataspaceName, final String anchorName,
 489                                              final DataNode dataNode) {
 490         final FragmentEntity fragmentEntity =
 491             getFragmentWithoutDescendantsByXpath(dataspaceName, anchorName, dataNode.getXpath());
 492         updateFragmentEntityAndDescendantsWithDataNode(fragmentEntity, dataNode);
 493         try {
 494             fragmentRepository.save(fragmentEntity);
 495         } catch (final StaleStateException staleStateException) {
 496             throw new ConcurrencyException("Concurrent Transactions",
 497                     String.format("dataspace :'%s', Anchor : '%s' and xpath: '%s' is updated by another transaction.",
 498                             dataspaceName, anchorName, dataNode.getXpath()));
 499         }
 500     }
 501
 502     @Override
 503     public void updateDataNodesAndDescendants(final String dataspaceName,
 504                                               final String anchorName,
 505                                               final List<DataNode> dataNodes) {
 506
 507         final Map<DataNode, FragmentEntity> dataNodeFragmentEntityMap = dataNodes.stream()
 508                 .collect(Collectors.toMap(
 509                         dataNode -> dataNode,
 510                         dataNode ->
 511                             getFragmentWithoutDescendantsByXpath(dataspaceName, anchorName, dataNode.getXpath())));
 512         dataNodeFragmentEntityMap.forEach(
 513                 (dataNode, fragmentEntity) -> updateFragmentEntityAndDescendantsWithDataNode(fragmentEntity, dataNode));
 514         try {
 515             fragmentRepository.saveAll(dataNodeFragmentEntityMap.values());
 516         } catch (final StaleStateException staleStateException) {
 517             retryUpdateDataNodesIndividually(dataspaceName, anchorName, dataNodeFragmentEntityMap.values());
 518         }
 519     }
 520
 521     private void retryUpdateDataNodesIndividually(final String dataspaceName, final String anchorName,
 522                                                   final Collection<FragmentEntity> fragmentEntities) {
 523         final Collection<String> failedXpaths = new HashSet<>();
 524
 525         fragmentEntities.forEach(dataNodeFragment -> {
 526             try {
 527                 fragmentRepository.save(dataNodeFragment);
 528             } catch (final StaleStateException e) {
 529                 failedXpaths.add(dataNodeFragment.getXpath());
 530             }
 531         });
 532
 533         if (!failedXpaths.isEmpty()) {
 534             final String failedXpathsConcatenated = String.join(",", failedXpaths);
 535             throw new ConcurrencyException("Concurrent Transactions", String.format(
 536                     "DataNodes : %s in Dataspace :'%s' with Anchor : '%s'  are updated by another transaction.",
 537                     failedXpathsConcatenated, dataspaceName, anchorName));
 538         }
 539     }
 540
 541     private void updateFragmentEntityAndDescendantsWithDataNode(final FragmentEntity existingFragmentEntity,
 542                                                                 final DataNode newDataNode) {
 543
 544         existingFragmentEntity.setAttributes(jsonObjectMapper.asJsonString(newDataNode.getLeaves()));
 545
 546         final Map<String, FragmentEntity> existingChildrenByXpath = existingFragmentEntity.getChildFragments().stream()
 547                 .collect(Collectors.toMap(FragmentEntity::getXpath, childFragmentEntity -> childFragmentEntity));
 548
 549         final Collection<FragmentEntity> updatedChildFragments = new HashSet<>();
 550
 551         for (final DataNode newDataNodeChild : newDataNode.getChildDataNodes()) {
 552             final FragmentEntity childFragment;
 553             if (isNewDataNode(newDataNodeChild, existingChildrenByXpath)) {
 554                 childFragment = convertToFragmentWithAllDescendants(
 555                         existingFragmentEntity.getDataspace(), existingFragmentEntity.getAnchor(), newDataNodeChild);
 556             } else {
 557                 childFragment = existingChildrenByXpath.get(newDataNodeChild.getXpath());
 558                 updateFragmentEntityAndDescendantsWithDataNode(childFragment, newDataNodeChild);
 559             }
 560             updatedChildFragments.add(childFragment);
 561         }
 562
 563         existingFragmentEntity.getChildFragments().clear();
 564         existingFragmentEntity.getChildFragments().addAll(updatedChildFragments);
 565     }
 566
 567     @Override
 568     @Transactional
 569     public void replaceListContent(final String dataspaceName, final String anchorName, final String parentNodeXpath,
 570                                    final Collection<DataNode> newListElements) {
 571         final FragmentEntity parentEntity =
 572             getFragmentWithoutDescendantsByXpath(dataspaceName, anchorName, parentNodeXpath);
 573         final String listElementXpathPrefix = getListElementXpathPrefix(newListElements);
 574         final Map<String, FragmentEntity> existingListElementFragmentEntitiesByXPath =
 575                 extractListElementFragmentEntitiesByXPath(parentEntity.getChildFragments(), listElementXpathPrefix);
 576         deleteListElements(parentEntity.getChildFragments(), existingListElementFragmentEntitiesByXPath);
 577         final Set<FragmentEntity> updatedChildFragmentEntities = new HashSet<>();
 578         for (final DataNode newListElement : newListElements) {
 579             final FragmentEntity existingListElementEntity =
 580                     existingListElementFragmentEntitiesByXPath.get(newListElement.getXpath());
 581             final FragmentEntity entityToBeAdded = getFragmentForReplacement(parentEntity, newListElement,
 582                     existingListElementEntity);
 583
 584             updatedChildFragmentEntities.add(entityToBeAdded);
 585         }
 586         parentEntity.getChildFragments().addAll(updatedChildFragmentEntities);
 587         fragmentRepository.save(parentEntity);
 588     }
 589
 590     @Override
 591     @Transactional
 592     public void deleteDataNodes(final String dataspaceName, final String anchorName) {
 593         final DataspaceEntity dataspaceEntity = dataspaceRepository.getByName(dataspaceName);
 594         anchorRepository.findByDataspaceAndName(dataspaceEntity, anchorName)
 595                 .ifPresent(
 596                         anchorEntity -> fragmentRepository.deleteByAnchorIn(Set.of(anchorEntity)));
 597     }
 598
 599     @Override
 600     @Transactional
 601     public void deleteListDataNode(final String dataspaceName, final String anchorName,
 602                                    final String targetXpath) {
 603         deleteDataNode(dataspaceName, anchorName, targetXpath, true);
 604     }
 605
 606     @Override
 607     @Transactional
 608     public void deleteDataNode(final String dataspaceName, final String anchorName, final String targetXpath) {
 609         deleteDataNode(dataspaceName, anchorName, targetXpath, false);
 610     }
 611
 612     private void deleteDataNode(final String dataspaceName, final String anchorName, final String targetXpath,
 613                                 final boolean onlySupportListNodeDeletion) {
 614         final String parentNodeXpath;
 615         FragmentEntity parentFragmentEntity = null;
 616         boolean targetDeleted;
 617         if (isRootXpath(targetXpath)) {
 618             deleteDataNodes(dataspaceName, anchorName);
 619             targetDeleted = true;
 620         } else {
 621             if (isRootContainerNodeXpath(targetXpath)) {
 622                 parentNodeXpath = targetXpath;
 623             } else {
 624                 parentNodeXpath = CpsPathUtil.getNormalizedParentXpath(targetXpath);
 625             }
 626             parentFragmentEntity = getFragmentWithoutDescendantsByXpath(dataspaceName, anchorName, parentNodeXpath);
 627             if (CpsPathUtil.isPathToListElement(targetXpath)) {
 628                 targetDeleted = deleteDataNode(parentFragmentEntity, targetXpath);
 629             } else {
 630                 targetDeleted = deleteAllListElements(parentFragmentEntity, targetXpath);
 631                 final boolean tryToDeleteDataNode = !targetDeleted && !onlySupportListNodeDeletion;
 632                 if (tryToDeleteDataNode) {
 633                     targetDeleted = deleteDataNode(parentFragmentEntity, targetXpath);
 634                 }
 635             }
 636         }
 637         if (!targetDeleted) {
 638             final String additionalInformation = onlySupportListNodeDeletion
 639                     ? "The target is probably not a List." : "";
 640             throw new DataNodeNotFoundException(parentFragmentEntity.getDataspace().getName(),
 641                     parentFragmentEntity.getAnchor().getName(), targetXpath, additionalInformation);
 642         }
 643     }
 644
 645     private boolean deleteDataNode(final FragmentEntity parentFragmentEntity, final String targetXpath) {
 646         final String normalizedTargetXpath = CpsPathUtil.getNormalizedXpath(targetXpath);
 647         if (parentFragmentEntity.getXpath().equals(normalizedTargetXpath)) {
 648             fragmentRepository.delete(parentFragmentEntity);
 649             return true;
 650         }
 651         if (parentFragmentEntity.getChildFragments()
 652                 .removeIf(fragment -> fragment.getXpath().equals(normalizedTargetXpath))) {
 653             fragmentRepository.save(parentFragmentEntity);
 654             return true;
 655         }
 656         return false;
 657     }
 658
 659     private boolean deleteAllListElements(final FragmentEntity parentFragmentEntity, final String listXpath) {
 660         final String normalizedListXpath = CpsPathUtil.getNormalizedXpath(listXpath);
 661         final String deleteTargetXpathPrefix = normalizedListXpath + "[";
 662         if (parentFragmentEntity.getChildFragments()
 663                 .removeIf(fragment -> fragment.getXpath().startsWith(deleteTargetXpathPrefix))) {
 664             fragmentRepository.save(parentFragmentEntity);
 665             return true;
 666         }
 667         return false;
 668     }
 669
 670     private static void deleteListElements(
 671             final Collection<FragmentEntity> fragmentEntities,
 672             final Map<String, FragmentEntity> existingListElementFragmentEntitiesByXPath) {
 673         fragmentEntities.removeAll(existingListElementFragmentEntitiesByXPath.values());
 674     }
 675
 676     private static String getListElementXpathPrefix(final Collection<DataNode> newListElements) {
 677         if (newListElements.isEmpty()) {
 678             throw new CpsAdminException("Invalid list replacement",
 679                     "Cannot replace list elements with empty collection");
 680         }
 681         final String firstChildNodeXpath = newListElements.iterator().next().getXpath();
 682         return firstChildNodeXpath.substring(0, firstChildNodeXpath.lastIndexOf('[') + 1);
 683     }
 684
 685     private FragmentEntity getFragmentForReplacement(final FragmentEntity parentEntity,
 686                                                      final DataNode newListElement,
 687                                                      final FragmentEntity existingListElementEntity) {
 688         if (existingListElementEntity == null) {
 689             return convertToFragmentWithAllDescendants(
 690                     parentEntity.getDataspace(), parentEntity.getAnchor(), newListElement);
 691         }
 692         if (newListElement.getChildDataNodes().isEmpty()) {
 693             copyAttributesFromNewListElement(existingListElementEntity, newListElement);
 694             existingListElementEntity.getChildFragments().clear();
 695         } else {
 696             updateFragmentEntityAndDescendantsWithDataNode(existingListElementEntity, newListElement);
 697         }
 698         return existingListElementEntity;
 699     }
 700
 701     private static boolean isNewDataNode(final DataNode replacementDataNode,
 702                                          final Map<String, FragmentEntity> existingListElementsByXpath) {
 703         return !existingListElementsByXpath.containsKey(replacementDataNode.getXpath());
 704     }
 705
 706     private static boolean isRootContainerNodeXpath(final String xpath) {
 707         return 0 == xpath.lastIndexOf('/');
 708     }
 709
 710     private void copyAttributesFromNewListElement(final FragmentEntity existingListElementEntity,
 711                                                   final DataNode newListElement) {
 712         final FragmentEntity replacementFragmentEntity =
 713                 FragmentEntity.builder().attributes(jsonObjectMapper.asJsonString(
 714                         newListElement.getLeaves())).build();
 715         existingListElementEntity.setAttributes(replacementFragmentEntity.getAttributes());
 716     }
 717
 718     private static Map<String, FragmentEntity> extractListElementFragmentEntitiesByXPath(
 719             final Set<FragmentEntity> childEntities, final String listElementXpathPrefix) {
 720         return childEntities.stream()
 721                 .filter(fragmentEntity -> fragmentEntity.getXpath().startsWith(listElementXpathPrefix))
 722                 .collect(Collectors.toMap(FragmentEntity::getXpath, fragmentEntity -> fragmentEntity));
 723     }
 724
 725     private static boolean isRootXpath(final String xpath) {
 726         return "/".equals(xpath) || "".equals(xpath);
 727     }
 728
 729     private String mergeLeaves(final Map<String, Serializable> updateLeaves, final String currentLeavesAsString) {
 730         final Map<String, Serializable> currentLeavesAsMap = currentLeavesAsString.isEmpty()
 731             ? new HashMap<>() : jsonObjectMapper.convertJsonString(currentLeavesAsString, Map.class);
 732         currentLeavesAsMap.putAll(updateLeaves);
 733         if (currentLeavesAsMap.isEmpty()) {
 734             return "";
 735         }
 736         return jsonObjectMapper.asJsonString(currentLeavesAsMap);
 737     }
 738 }