Olingo分析和实践——Delta 序列化器详解(第三部分: 实战案例)

案例1: 电商订单系统同步

电商订单系统架构图

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订单增量同步流程图

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订单状态变更处理流程图

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订单状态说明:

  • PendingPayment (待付款): Delta操作 - 新增订单实体
  • Paid (已付款): Delta操作 - 更新订单状态
  • Cancelled (已取消): Delta操作 - 删除实体或标记取消
  • Shipped (已发货): Delta操作 - 更新状态+物流信息
  • Completed (已完成): Delta操作 - 更新状态+完成时间
@Service
public class ECommerceOrderSyncService {
    
    private final OData odata = OData.newInstance();
    private final OrderRepository orderRepo;
    private final CustomerRepository customerRepo;
    private final ProductRepository productRepo;
    
    /**
     * 电商订单增量同步
     */
    public class OrderDeltaSyncService {
        
        /**
         * 获取订单相关的增量变更
         */
        public String getOrderDeltaChanges(String lastSyncToken, 
                String[] entitySets) throws SerializerException, IOException {
            
            Timestamp lastSync = parseSyncToken(lastSyncToken);
            Delta delta = new Delta();
            
            // 处理订单变更
            if (Arrays.asList(entitySets).contains("Orders")) {
                processOrderChanges(delta, lastSync);
            }
            
            // 处理客户变更
            if (Arrays.asList(entitySets).contains("Customers")) {
                processCustomerChanges(delta, lastSync);
            }
            
            // 处理产品变更
            if (Arrays.asList(entitySets).contains("Products")) {
                processProductChanges(delta, lastSync);
            }
            
            // 处理关联关系变更
            processRelationshipChanges(delta, lastSync);
            
            // 设置分页和Delta链接
            setupPaginationAndDeltaLinks(delta, entitySets);
            
            return serializeOrderDelta(delta, entitySets);
        }
        
        private void processOrderChanges(Delta delta, Timestamp lastSync) {
            // 获取变更的订单
            List<Order> changedOrders = orderRepo.findChangedOrdersSince(lastSync);
            
            for (Order order : changedOrders) {
                if (order.isDeleted()) {
                    // 处理删除的订单
                    DeletedEntity deleted = new DeletedEntity(
                        "Orders(" + order.getId() + ")", 
                        DeletedEntity.Reason.DELETED);
                    delta.getDeletedEntities().add(deleted);
                } else {
                    // 处理新增或修改的订单
                    Entity orderEntity = convertOrderToEntity(order);
                    delta.getEntities().add(orderEntity);
                }
            }
        }
        
        private void processRelationshipChanges(Delta delta, Timestamp lastSync) {
            // 处理订单-产品关联变更
            List<OrderProductLink> linkChanges = orderRepo.findOrderProductLinkChanges(lastSync);
            
            for (OrderProductLink linkChange : linkChanges) {
                String source = "Orders(" + linkChange.getOrderId() + ")";
                String target = "Products(" + linkChange.getProductId() + ")";
                String relationship = "OrderItems";
                
                DeltaLink deltaLink = new DeltaLink(source, relationship, target);
                
                if (linkChange.isDeleted()) {
                    delta.getDeletedLinks().add(deltaLink);
                } else {
                    delta.getAddedLinks().add(deltaLink);
                }
            }
            
            // 处理客户-订单关联变更
            List<CustomerOrderLink> customerOrderLinks = 
                customerRepo.findCustomerOrderLinkChanges(lastSync);
            
            for (CustomerOrderLink link : customerOrderLinks) {
                String source = "Customers(" + link.getCustomerId() + ")";
                String target = "Orders(" + link.getOrderId() + ")";
                String relationship = "Orders";
                
                DeltaLink deltaLink = new DeltaLink(source, relationship, target);
                
                if (link.isDeleted()) {
                    delta.getDeletedLinks().add(deltaLink);
                } else {
                    delta.getAddedLinks().add(deltaLink);
                }
            }
        }
        
        private Entity convertOrderToEntity(Order order) {
            Entity entity = new Entity();
            
            // 基础属性
            entity.addProperty(new Property(null, "OrderID", ValueType.PRIMITIVE, order.getId()));
            entity.addProperty(new Property(null, "CustomerID", ValueType.PRIMITIVE, order.getCustomerId()));
            entity.addProperty(new Property(null, "OrderDate", ValueType.PRIMITIVE, 
                Calendar.getInstance()));
            entity.addProperty(new Property(null, "TotalAmount", ValueType.PRIMITIVE, order.getTotalAmount()));
            entity.addProperty(new Property(null, "Status", ValueType.PRIMITIVE, order.getStatus().name()));
            
            // 复杂属性 - 配送地址
            if (order.getShippingAddress() != null) {
                ComplexValue address = convertAddressToComplexValue(order.getShippingAddress());
                entity.addProperty(new Property(null, "ShippingAddress", ValueType.COMPLEX, address));
            }
            
            // 集合属性 - 订单项
            if (order.getOrderItems() != null && !order.getOrderItems().isEmpty()) {
                List<ComplexValue> orderItems = order.getOrderItems().stream()
                    .map(this::convertOrderItemToComplexValue)
                    .collect(Collectors.toList());
                entity.addProperty(new Property(null, "OrderItems", ValueType.COLLECTION_COMPLEX, orderItems));
            }
            
            // 审计属性
            entity.addProperty(new Property(null, "CreatedAt", ValueType.PRIMITIVE, order.getCreatedAt()));
            entity.addProperty(new Property(null, "UpdatedAt", ValueType.PRIMITIVE, order.getUpdatedAt()));
            entity.addProperty(new Property(null, "Version", ValueType.PRIMITIVE, order.getVersion()));
            
            return entity;
        }
        
        private ComplexValue convertOrderItemToComplexValue(OrderItem item) {
            ComplexValue complex = new ComplexValue();
            
            complex.getValue().add(new Property(null, "ProductID", ValueType.PRIMITIVE, item.getProductId()));
            complex.getValue().add(new Property(null, "ProductName", ValueType.PRIMITIVE, item.getProductName()));
            complex.getValue().add(new Property(null, "Quantity", ValueType.PRIMITIVE, item.getQuantity()));
            complex.getValue().add(new Property(null, "UnitPrice", ValueType.PRIMITIVE, item.getUnitPrice()));
            complex.getValue().add(new Property(null, "Discount", ValueType.PRIMITIVE, item.getDiscount()));
            complex.getValue().add(new Property(null, "LineTotal", ValueType.PRIMITIVE, item.getLineTotal()));
            
            return complex;
        }
        
        /**
         * 处理订单状态变更的特殊逻辑
         */
        public String getOrderStatusChanges(String lastSyncToken, String status) 
                throws SerializerException, IOException {
            
            Timestamp lastSync = parseSyncToken(lastSyncToken);
            OrderStatus targetStatus = OrderStatus.valueOf(status);
            
            // 获取状态变更到指定状态的订单
            List<Order> statusChangedOrders = orderRepo.findOrdersWithStatusChangeSince(
                lastSync, targetStatus);
            
            Delta delta = new Delta();
            
            for (Order order : statusChangedOrders) {
                Entity orderEntity = convertOrderToEntity(order);
                
                // 添加状态变更元数据
                orderEntity.addProperty(new Property(null, "StatusChangedAt", 
                    ValueType.PRIMITIVE, order.getStatusChangedAt()));
                orderEntity.addProperty(new Property(null, "PreviousStatus", 
                    ValueType.PRIMITIVE, order.getPreviousStatus().name()));
                
                delta.getEntities().add(orderEntity);
            }
            
            // 设置状态特定的Delta链接
            String deltaToken = generateStatusSpecificDeltaToken(status);
            delta.setDeltaLink("http://api.ecommerce.com/orders?$filter=Status eq '" + 
                status + "'&$deltatoken=" + deltaToken);
            
            return serializeOrderDelta(delta, new String[]{"Orders"});
        }
    }
}

案例2: IoT设备数据收集

IoT数据收集系统架构图

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IoT设备数据变更处理流程图

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IoT实时数据流处理图

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IoT设备状态变更时序图

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@Service
public class IoTDeviceDataCollectionService {
    
    private final OData odata = OData.newInstance();
    private final DeviceRepository deviceRepo;
    private final SensorDataRepository sensorRepo;
    private final AlertRepository alertRepo;
    
    /**
     * IoT设备数据增量收集
     */
    public class IoTDataDeltaService {
        
        /**
         * 获取设备数据变更
         */
        public String getDeviceDataChanges(String deviceGroup, String lastSyncToken, 
                Duration timeWindow) throws SerializerException, IOException {
            
            Timestamp lastSync = parseSyncToken(lastSyncToken);
            Timestamp windowStart = Timestamp.valueOf(
                LocalDateTime.now().minus(timeWindow));
            
            // 使用最近的时间戳作为起始点
            Timestamp effectiveStart = lastSync.after(windowStart) ? lastSync : windowStart;
            
            Delta delta = new Delta();
            
            // 处理设备状态变更
            processDeviceStatusChanges(delta, deviceGroup, effectiveStart);
            
            // 处理传感器数据
            processSensorDataChanges(delta, deviceGroup, effectiveStart);
            
            // 处理告警信息
            processAlertChanges(delta, deviceGroup, effectiveStart);
            
            // 设置时间窗口特定的Delta链接
            setupTimeWindowDeltaLinks(delta, deviceGroup, timeWindow);
            
            return serializeIoTDelta(delta, deviceGroup);
        }
        
        private void processDeviceStatusChanges(Delta delta, String deviceGroup, 
                Timestamp since) {
            
            List<Device> changedDevices = deviceRepo.findDeviceStatusChangesSince(
                deviceGroup, since);
            
            for (Device device : changedDevices) {
                Entity deviceEntity = new Entity();
                
                // 设备基础信息
                deviceEntity.addProperty(new Property(null, "DeviceID", 
                    ValueType.PRIMITIVE, device.getId()));
                deviceEntity.addProperty(new Property(null, "DeviceName", 
                    ValueType.PRIMITIVE, device.getName()));
                deviceEntity.addProperty(new Property(null, "DeviceGroup", 
                    ValueType.PRIMITIVE, device.getGroup()));
                deviceEntity.addProperty(new Property(null, "Status", 
                    ValueType.PRIMITIVE, device.getStatus().name()));
                
                // 位置信息
                if (device.getLocation() != null) {
                    ComplexValue location = new ComplexValue();
                    location.getValue().add(new Property(null, "Latitude", 
                        ValueType.PRIMITIVE, device.getLocation().getLatitude()));
                    location.getValue().add(new Property(null, "Longitude", 
                        ValueType.PRIMITIVE, device.getLocation().getLongitude()));
                    location.getValue().add(new Property(null, "Altitude", 
                        ValueType.PRIMITIVE, device.getLocation().getAltitude()));
                    
                    deviceEntity.addProperty(new Property(null, "Location", 
                        ValueType.COMPLEX, location));
                }
                
                // 设备属性
                Map<String, Object> properties = device.getProperties();
                for (Map.Entry<String, Object> prop : properties.entrySet()) {
                    deviceEntity.addProperty(new Property(null, 
                        "Property_" + prop.getKey(), ValueType.PRIMITIVE, prop.getValue()));
                }
                
                // 最后通信时间
                deviceEntity.addProperty(new Property(null, "LastCommunication", 
                    ValueType.PRIMITIVE, device.getLastCommunication()));
                
                delta.getEntities().add(deviceEntity);
            }
        }
        
        private void processSensorDataChanges(Delta delta, String deviceGroup, 
                Timestamp since) {
            
            // 获取传感器数据变更(按设备聚合)
            List<SensorDataSummary> sensorSummaries = 
                sensorRepo.findSensorDataSummariesSince(deviceGroup, since);
            
            for (SensorDataSummary summary : sensorSummaries) {
                Entity sensorEntity = new Entity();
                
                sensorEntity.addProperty(new Property(null, "DeviceID", 
                    ValueType.PRIMITIVE, summary.getDeviceId()));
                sensorEntity.addProperty(new Property(null, "SensorType", 
                    ValueType.PRIMITIVE, summary.getSensorType()));
                
                // 聚合数据
                sensorEntity.addProperty(new Property(null, "MinValue", 
                    ValueType.PRIMITIVE, summary.getMinValue()));
                sensorEntity.addProperty(new Property(null, "MaxValue", 
                    ValueType.PRIMITIVE, summary.getMaxValue()));
                sensorEntity.addProperty(new Property(null, "AvgValue", 
                    ValueType.PRIMITIVE, summary.getAvgValue()));
                sensorEntity.addProperty(new Property(null, "LastValue", 
                    ValueType.PRIMITIVE, summary.getLastValue()));
                
                // 数据点数量和时间范围
                sensorEntity.addProperty(new Property(null, "DataPointCount", 
                    ValueType.PRIMITIVE, summary.getDataPointCount()));
                sensorEntity.addProperty(new Property(null, "FirstReading", 
                    ValueType.PRIMITIVE, summary.getFirstReading()));
                sensorEntity.addProperty(new Property(null, "LastReading", 
                    ValueType.PRIMITIVE, summary.getLastReading()));
                
                // 异常数据点
                if (summary.getAnomalousReadings() > 0) {
                    sensorEntity.addProperty(new Property(null, "AnomalousReadings", 
                        ValueType.PRIMITIVE, summary.getAnomalousReadings()));
                }
                
                delta.getEntities().add(sensorEntity);
            }
        }
        
        private void processAlertChanges(Delta delta, String deviceGroup, 
                Timestamp since) {
            
            List<Alert> newAlerts = alertRepo.findNewAlertsSince(deviceGroup, since);
            List<Alert> resolvedAlerts = alertRepo.findResolvedAlertsSince(deviceGroup, since);
            
            // 新增的告警
            for (Alert alert : newAlerts) {
                Entity alertEntity = new Entity();
                
                alertEntity.addProperty(new Property(null, "AlertID", 
                    ValueType.PRIMITIVE, alert.getId()));
                alertEntity.addProperty(new Property(null, "DeviceID", 
                    ValueType.PRIMITIVE, alert.getDeviceId()));
                alertEntity.addProperty(new Property(null, "AlertType", 
                    ValueType.PRIMITIVE, alert.getType().name()));
                alertEntity.addProperty(new Property(null, "Severity", 
                    ValueType.PRIMITIVE, alert.getSeverity().name()));
                alertEntity.addProperty(new Property(null, "Message", 
                    ValueType.PRIMITIVE, alert.getMessage()));
                alertEntity.addProperty(new Property(null, "CreatedAt", 
                    ValueType.PRIMITIVE, alert.getCreatedAt()));
                alertEntity.addProperty(new Property(null, "Status", 
                    ValueType.PRIMITIVE, "ACTIVE"));
                
                // 告警上下文数据
                if (alert.getContextData() != null) {
                    ComplexValue context = convertMapToComplexValue(alert.getContextData());
                    alertEntity.addProperty(new Property(null, "ContextData", 
                        ValueType.COMPLEX, context));
                }
                
                delta.getEntities().add(alertEntity);
            }
            
            // 已解决的告警(作为更新处理)
            for (Alert alert : resolvedAlerts) {
                Entity alertEntity = new Entity();
                
                alertEntity.addProperty(new Property(null, "AlertID", 
                    ValueType.PRIMITIVE, alert.getId()));
                alertEntity.addProperty(new Property(null, "Status", 
                    ValueType.PRIMITIVE, "RESOLVED"));
                alertEntity.addProperty(new Property(null, "ResolvedAt", 
                    ValueType.PRIMITIVE, alert.getResolvedAt()));
                alertEntity.addProperty(new Property(null, "ResolvedBy", 
                    ValueType.PRIMITIVE, alert.getResolvedBy()));
                alertEntity.addProperty(new Property(null, "ResolutionNote", 
                    ValueType.PRIMITIVE, alert.getResolutionNote()));
                
                delta.getEntities().add(alertEntity);
            }
        }
        
        /**
         * 实时数据流处理
         */
        @EventListener
        public void handleRealTimeDeviceEvent(DeviceEvent event) {
            try {
                // 构建实时Delta响应
                Delta realtimeDelta = new Delta();
                
                Entity eventEntity = new Entity();
                eventEntity.addProperty(new Property(null, "EventID", 
                    ValueType.PRIMITIVE, event.getId()));
                eventEntity.addProperty(new Property(null, "DeviceID", 
                    ValueType.PRIMITIVE, event.getDeviceId()));
                eventEntity.addProperty(new Property(null, "EventType", 
                    ValueType.PRIMITIVE, event.getType().name()));
                eventEntity.addProperty(new Property(null, "Timestamp", 
                    ValueType.PRIMITIVE, event.getTimestamp()));
                eventEntity.addProperty(new Property(null, "Data", 
                    ValueType.PRIMITIVE, event.getData()));
                
                realtimeDelta.getEntities().add(eventEntity);
                
                // 序列化并推送到实时通道
                String deltaJson = serializeIoTDelta(realtimeDelta, event.getDeviceGroup());
                publishToRealTimeChannel(event.getDeviceGroup(), deltaJson);
                
            } catch (Exception e) {
                log.error("处理实时设备事件失败", e);
            }
        }
    }
}

案例3: 金融交易数据同步

金融交易系统安全架构图

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金融交易Delta处理安全流程图

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金融风险评估与合规检查流程图

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金融数据加密和签名流程图

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@Service
public class FinancialTransactionSyncService {
    
    private final OData odata = OData.newInstance();
    private final TransactionRepository transactionRepo;
    private final AccountRepository accountRepo;
    private final AuditService auditService;
    
    /**
     * 金融交易增量同步
     */
    public class FinancialDeltaSyncService {
        
        /**
         * 获取交易数据变更(带安全检查)
         */
        @PreAuthorize("hasRole('FINANCIAL_DATA_ACCESS')")
        public String getTransactionChanges(String userContext, String lastSyncToken, 
                String[] accountIds) throws SerializerException, IOException {
            
            // 安全检查:验证用户对账户的访问权限
            validateAccountAccess(userContext, accountIds);
            
            Timestamp lastSync = parseSyncToken(lastSyncToken);
            Delta delta = new Delta();
            
            // 处理交易变更
            processTransactionChanges(delta, accountIds, lastSync);
            
            // 处理账户余额变更
            processAccountBalanceChanges(delta, accountIds, lastSync);
            
            // 处理风险评估变更
            processRiskAssessmentChanges(delta, accountIds, lastSync);
            
            // 审计日志
            auditService.logDataAccess(userContext, "TRANSACTION_DELTA", 
                Arrays.asList(accountIds));
            
            // 加密敏感数据
            encryptSensitiveFields(delta);
            
            return serializeFinancialDelta(delta, userContext);
        }
        
        private void processTransactionChanges(Delta delta, String[] accountIds, 
                Timestamp lastSync) {
            
            List<Transaction> changedTransactions = 
                transactionRepo.findTransactionChangesSince(accountIds, lastSync);
            
            for (Transaction transaction : changedTransactions) {
                if (transaction.isDeleted()) {
                    // 金融交易通常不物理删除,而是标记为取消
                    Entity cancelledTransaction = new Entity();
                    
                    cancelledTransaction.addProperty(new Property(null, "TransactionID", 
                        ValueType.PRIMITIVE, transaction.getId()));
                    cancelledTransaction.addProperty(new Property(null, "Status", 
                        ValueType.PRIMITIVE, "CANCELLED"));
                    cancelledTransaction.addProperty(new Property(null, "CancelledAt", 
                        ValueType.PRIMITIVE, transaction.getCancelledAt()));
                    cancelledTransaction.addProperty(new Property(null, "CancellationReason", 
                        ValueType.PRIMITIVE, transaction.getCancellationReason()));
                    
                    delta.getEntities().add(cancelledTransaction);
                } else {
                    Entity transactionEntity = convertTransactionToEntity(transaction);
                    delta.getEntities().add(transactionEntity);
                }
            }
        }
        
        private Entity convertTransactionToEntity(Transaction transaction) {
            Entity entity = new Entity();
            
            // 基础交易信息
            entity.addProperty(new Property(null, "TransactionID", 
                ValueType.PRIMITIVE, transaction.getId()));
            entity.addProperty(new Property(null, "TransactionType", 
                ValueType.PRIMITIVE, transaction.getType().name()));
            entity.addProperty(new Property(null, "Amount", 
                ValueType.PRIMITIVE, transaction.getAmount()));
            entity.addProperty(new Property(null, "Currency", 
                ValueType.PRIMITIVE, transaction.getCurrency().getCurrencyCode()));
            entity.addProperty(new Property(null, "TransactionDate", 
                ValueType.PRIMITIVE, transaction.getTransactionDate()));
            entity.addProperty(new Property(null, "Status", 
                ValueType.PRIMITIVE, transaction.getStatus().name()));
            
            // 账户信息
            entity.addProperty(new Property(null, "FromAccountID", 
                ValueType.PRIMITIVE, transaction.getFromAccountId()));
            entity.addProperty(new Property(null, "ToAccountID", 
                ValueType.PRIMITIVE, transaction.getToAccountId()));
            
            // 描述和分类
            entity.addProperty(new Property(null, "Description", 
                ValueType.PRIMITIVE, transaction.getDescription()));
            entity.addProperty(new Property(null, "Category", 
                ValueType.PRIMITIVE, transaction.getCategory()));
            entity.addProperty(new Property(null, "SubCategory", 
                ValueType.PRIMITIVE, transaction.getSubCategory()));
            
            // 风险评估
            if (transaction.getRiskScore() != null) {
                entity.addProperty(new Property(null, "RiskScore", 
                    ValueType.PRIMITIVE, transaction.getRiskScore()));
                entity.addProperty(new Property(null, "RiskLevel", 
                    ValueType.PRIMITIVE, transaction.getRiskLevel().name()));
            }
            
            // 合规信息
            if (transaction.getComplianceFlags() != null && !transaction.getComplianceFlags().isEmpty()) {
                List<String> flags = new ArrayList<>(transaction.getComplianceFlags());
                entity.addProperty(new Property(null, "ComplianceFlags", 
                    ValueType.COLLECTION_PRIMITIVE, flags));
            }
            
            // 交易费用
            if (transaction.getFees() != null && !transaction.getFees().isEmpty()) {
                List<ComplexValue> fees = transaction.getFees().stream()
                    .map(this::convertFeeToComplexValue)
                    .collect(Collectors.toList());
                entity.addProperty(new Property(null, "Fees", 
                    ValueType.COLLECTION_COMPLEX, fees));
            }
            
            // 审计字段
            entity.addProperty(new Property(null, "CreatedAt", 
                ValueType.PRIMITIVE, transaction.getCreatedAt()));
            entity.addProperty(new Property(null, "CreatedBy", 
                ValueType.PRIMITIVE, transaction.getCreatedBy()));
            entity.addProperty(new Property(null, "LastModifiedAt", 
                ValueType.PRIMITIVE, transaction.getLastModifiedAt()));
            entity.addProperty(new Property(null, "LastModifiedBy", 
                ValueType.PRIMITIVE, transaction.getLastModifiedBy()));
            entity.addProperty(new Property(null, "Version", 
                ValueType.PRIMITIVE, transaction.getVersion()));
            
            return entity;
        }
        
        private void processAccountBalanceChanges(Delta delta, String[] accountIds, 
                Timestamp lastSync) {
            
            List<AccountBalance> balanceChanges = 
                accountRepo.findBalanceChangesSince(accountIds, lastSync);
            
            for (AccountBalance balance : balanceChanges) {
                Entity balanceEntity = new Entity();
                
                balanceEntity.addProperty(new Property(null, "AccountID", 
                    ValueType.PRIMITIVE, balance.getAccountId()));
                balanceEntity.addProperty(new Property(null, "Currency", 
                    ValueType.PRIMITIVE, balance.getCurrency().getCurrencyCode()));
                balanceEntity.addProperty(new Property(null, "AvailableBalance", 
                    ValueType.PRIMITIVE, balance.getAvailableBalance()));
                balanceEntity.addProperty(new Property(null, "BookBalance", 
                    ValueType.PRIMITIVE, balance.getBookBalance()));
                balanceEntity.addProperty(new Property(null, "PendingBalance", 
                    ValueType.PRIMITIVE, balance.getPendingBalance()));
                balanceEntity.addProperty(new Property(null, "HoldAmount", 
                    ValueType.PRIMITIVE, balance.getHoldAmount()));
                balanceEntity.addProperty(new Property(null, "LastUpdated", 
                    ValueType.PRIMITIVE, balance.getLastUpdated()));
                
                // 余额变更历史
                if (balance.getChangeHistory() != null && !balance.getChangeHistory().isEmpty()) {
                    List<ComplexValue> history = balance.getChangeHistory().stream()
                        .map(this::convertBalanceChangeToComplexValue)
                        .collect(Collectors.toList());
                    balanceEntity.addProperty(new Property(null, "ChangeHistory", 
                        ValueType.COLLECTION_COMPLEX, history));
                }
                
                delta.getEntities().add(balanceEntity);
            }
        }
        
        /**
         * 加密敏感字段
         */
        private void encryptSensitiveFields(Delta delta) {
            EncryptionService encryptionService = EncryptionService.getInstance();
            
            for (Entity entity : delta.getEntities()) {
                for (Property property : entity.getProperties()) {
                    if (isSensitiveField(property.getName())) {
                        Object encryptedValue = encryptionService.encrypt(property.getValue());
                        property.setValue(encryptedValue);
                        
                        // 添加加密标记
                        Property encryptionFlag = new Property(null, 
                            property.getName() + "_Encrypted", ValueType.PRIMITIVE, true);
                        entity.addProperty(encryptionFlag);
                    }
                }
            }
        }
        
        private boolean isSensitiveField(String fieldName) {
            Set<String> sensitiveFields = Set.of(
                "AccountNumber", "RoutingNumber", "SSN", "TaxID", 
                "CreditCardNumber", "PIN", "Password", "SecurityAnswer"
            );
            return sensitiveFields.contains(fieldName);
        }
        
        /**
         * 序列化金融Delta数据
         */
        private String serializeFinancialDelta(Delta delta, String userContext) 
                throws SerializerException, IOException {
            
            // 使用完整元数据以确保数据完整性
            EdmDeltaSerializer serializer = odata.createEdmDeltaSerializer(
                ContentType.JSON_FULL_METADATA);
            
            ContextURL contextURL = ContextURL.with()
                .entitySet("FinancialTransactions")
                .suffix(Suffix.DELTA)
                .build();
                
            DeltaSerializerOptions options = DeltaSerializerOptions.with()
                .contextURL(contextURL)
                .build();
            
            SerializerResult result = serializer.entityCollection(null, null, delta, options);
            String deltaJson = IOUtils.toString(result.getContent(), StandardCharsets.UTF_8);
            
            // 添加数字签名以确保数据完整性
            String signature = generateDataSignature(deltaJson, userContext);
            
            // 包装最终响应
            Map<String, Object> secureResponse = new HashMap<>();
            secureResponse.put("data", deltaJson);
            secureResponse.put("signature", signature);
            secureResponse.put("timestamp", System.currentTimeMillis());
            secureResponse.put("userContext", userContext);
            
            return new ObjectMapper().writeValueAsString(secureResponse);
        }
    }
}

与其他组件集成

与Spring Cache集成

Spring Cache集成架构图

在这里插入图片描述

缓存策略决策流程图

在这里插入图片描述

与消息队列集成

消息队列集成架构图

在这里插入图片描述

消息处理流程图

在这里插入图片描述

与数据库事务集成

事务处理架构图

在这里插入图片描述

分布式事务处理流程图

在这里插入图片描述

事务回滚和恢复机制图

在这里插入图片描述


总结与展望

我们深入探讨了Delta序列化器的高级应用场景,包括实时数据同步、微服务间数据一致性以及移动端离线同步等。同时,通过电商订单系统、IoT设备数据收集和金融交易数据同步等实战案例,展示了Delta序列化器在不同领域的灵活应用。此外,还介绍了Delta序列化器与Spring Cache、消息队列和数据库事务等组件的集成方式,为开发者提供了丰富的参考和指导。

Delta序列化器应用场景全景图

在这里插入图片描述

技术架构对比矩阵

在这里插入图片描述
数据点说明:

  • BasicSync (基础同步): [0.2, 0.3] - 简单的数据同步应用
  • MobileSync (移动端同步): [0.4, 0.5] - 移动应用离线同步
  • RealtimeSync (实时同步): [0.6, 0.8] - 实时数据同步系统
  • IoTCollection (IoT数据收集): [0.7, 0.9] - 物联网数据采集
  • MicroserviceConsistency (微服务一致性): [0.8, 0.7] - 微服务间数据一致性
  • FinancialTransactionSync (金融交易同步): [0.9, 0.9] - 金融交易数据同步
  • EcommerceOrderSystem (电商订单系统): [0.6, 0.6] - 电商订单处理
  • CacheIntegration (缓存集成): [0.3, 0.7] - 缓存数据同步
  • MessageQueueIntegration (消息队列集成): [0.5, 0.8] - 消息队列数据处理
  • DistributedTransaction (分布式事务): [0.9, 0.6] - 分布式事务处理

象限说明:

  • X轴(复杂度): Low_Complexity(低复杂度) → High_Complexity(高复杂度)
  • Y轴(性能要求): Low_Performance(低性能要求) → High_Performance(高性能要求)

象限分析:

  • 左下象限(低复杂度+低性能): 基础同步应用,适合入门学习
  • 右下象限(高复杂度+低性能): 分布式事务等,需要复杂逻辑但性能要求不高
  • 左上象限(低复杂度+高性能): 缓存集成等,简单但高效的应用
  • 右上象限(高复杂度+高性能): IoT数据收集、金融交易等关键系统
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