Data Governance &Compliance

// Data Inventory Service
@Service
public class DataInventoryService {
    
    @Autowired
    private DataSourceRepository dataSourceRepository;
    
    @Autowired
    private DataClassificationService classificationService;
    
    public DataInventory createInventory(String organizationId) {
        DataInventory inventory = new DataInventory();
        inventory.setOrganizationId(organizationId);
        inventory.setCreatedAt(Instant.now());
        
        // Discover data sources
        List<DataSource> dataSources = dataSourceRepository.findByOrganizationId(organizationId);
        
        for (DataSource source : dataSources) {
            DataSourceInventory sourceInventory = analyzeDataSource(source);
            inventory.addDataSource(sourceInventory);
        }
        
        return inventory;
    }
    
    private DataSourceInventory analyzeDataSource(DataSource source) {
        DataSourceInventory inventory = new DataSourceInventory();
        inventory.setSourceId(source.getId());
        inventory.setSourceName(source.getName());
        inventory.setSourceType(source.getType());
        
        // Analyze data structure
        List<DataField> fields = source.getFields();
        for (DataField field : fields) {
            DataFieldClassification classification = classificationService.classifyField(field);
            inventory.addField(classification);
        }
        
        // Identify personal data
        List<PersonalDataField> personalDataFields = fields.stream()
            .filter(field -> classificationService.isPersonalData(field))
            .map(field -> new PersonalDataField(field, classificationService.getDataSubjectType(field)))
            .collect(Collectors.toList());
        
        inventory.setPersonalDataFields(personalDataFields);
        
        return inventory;
    }
}

// Data Subject Rights Service
@Service
public class DataSubjectRightsService {
    
    @Autowired
    private PersonalDataRepository personalDataRepository;
    
    @Autowired
    private DataErasureService erasureService;
    
    public DataSubjectResponse handleRightToAccess(String dataSubjectId, String requestId) {
        // Validate request
        validateRequest(dataSubjectId, requestId);
        
        // Collect all personal data
        List<PersonalDataRecord> personalData = personalDataRepository
            .findByDataSubjectId(dataSubjectId);
        
        // Format response
        DataSubjectResponse response = new DataSubjectResponse();
        response.setRequestId(requestId);
        response.setDataSubjectId(dataSubjectId);
        response.setPersonalData(personalData);
        response.setProcessedAt(Instant.now());
        
        // Log request for audit
        logDataSubjectRequest(requestId, "ACCESS", dataSubjectId);
        
        return response;
    }
    
    public ErasureResponse handleRightToErasure(String dataSubjectId, String requestId) {
        // Validate request
        validateRequest(dataSubjectId, requestId);
        
        // Check if erasure is possible (no legal basis for retention)
        if (!canErasureBeProcessed(dataSubjectId)) {
            throw new ErasureNotPossibleException("Legal basis prevents erasure");
        }
        
        // Process erasure
        ErasureResult result = erasureService.erasePersonalData(dataSubjectId);
        
        // Log request for audit
        logDataSubjectRequest(requestId, "ERASURE", dataSubjectId);
        
        return new ErasureResponse(requestId, dataSubjectId, result);
    }
    
    private boolean canErasureBeProcessed(String dataSubjectId) {
        // Check legal basis for data retention
        List<LegalBasis> legalBases = legalBasisService.getActiveLegalBases(dataSubjectId);
        
        // If any legal basis exists, erasure may not be possible
        return legalBases.stream()
            .noneMatch(basis -> basis.isActive() && basis.getRetentionPeriod().isActive());
    }
}

// Data Lineage Service
@Service
public class DataLineageService {
    
    @Autowired
    private LineageRepository lineageRepository;
    
    @Autowired
    private MetadataService metadataService;
    
    public void trackDataFlow(DataFlowEvent event) {
        // Create lineage record
        DataLineage lineage = new DataLineage();
        lineage.setFlowId(event.getFlowId());
        lineage.setSourceSystem(event.getSourceSystem());
        lineage.setTargetSystem(event.getTargetSystem());
        lineage.setDataEntity(event.getDataEntity());
        lineage.setTransformationType(event.getTransformationType());
        lineage.setTimestamp(Instant.now());
        lineage.setMetadata(metadataService.extractMetadata(event));
        
        // Store lineage
        lineageRepository.save(lineage);
        
        // Update lineage graph
        updateLineageGraph(lineage);
    }
    
    public LineageGraph getLineageGraph(String dataEntity, String organizationId) {
        // Get all lineage records for the entity
        List<DataLineage> lineageRecords = lineageRepository
            .findByDataEntityAndOrganizationId(dataEntity, organizationId);
        
        // Build graph
        LineageGraph graph = new LineageGraph();
        graph.setDataEntity(dataEntity);
        
        for (DataLineage record : lineageRecords) {
            LineageNode sourceNode = createOrGetNode(graph, record.getSourceSystem());
            LineageNode targetNode = createOrGetNode(graph, record.getTargetSystem());
            
            LineageEdge edge = new LineageEdge(sourceNode, targetNode, record);
            graph.addEdge(edge);
        }
        
        return graph;
    }
    
    public ImpactAnalysis analyzeImpact(String dataEntity, String organizationId) {
        LineageGraph graph = getLineageGraph(dataEntity, organizationId);
        
        ImpactAnalysis analysis = new ImpactAnalysis();
        analysis.setDataEntity(dataEntity);
        analysis.setDownstreamSystems(findDownstreamSystems(graph, dataEntity));
        analysis.setUpstreamSystems(findUpstreamSystems(graph, dataEntity));
        analysis.setDataQualityMetrics(calculateDataQualityMetrics(graph));
        
        return analysis;
    }
}