纯血鸿蒙进阶开发指南：分布式数据同步与跨设备协同

qq_16226939

567人浏览 · 2025-08-27 00:30:07

qq_16226939 · 2025-08-27 00:30:07 发布

一、分布式架构深度解析

1.1 分布式数据管理框架

分布式数据管理是鸿蒙系统的核心能力之一，它允许应用在多个设备间无缝同步和共享数据。基于分布式数据库（Distributed Data Store）实现，具备以下特性：

核心特性：

自动同步：数据变更自动推送到所有在线设备
冲突解决：内置时间戳和版本冲突解决机制
安全加密：端到端数据加密传输
离线支持：离线操作后在连接时自动同步

实现原理：
分布式数据库采用多副本架构，每个设备维护本地数据副本，通过分布式软总线进行数据同步。系统会自动选择最优的网络路径（蓝牙、Wi-Fi直连、局域网等）进行数据传输。

// distributed/DataSyncManager.ets
import distributedData from '@ohos.data.distributedData';
import { BusinessError } from '@ohos.base';
import Logger from '../utils/Logger';

const TAG = '分布式数据管理';
const STORE_ID = 'distributed_app_data';

export class DistributedEntry {
  key: string = '';
  value: distributedData.ValueType = '';
  timestamp: number = 0;
  deviceId: string = '';
}

export class DataSyncManager {
  private kvManager: distributedData.KVManager | null = null;
  private kvStore: distributedData.KVStore | null = null;
  private syncCallback: (data: DistributedEntry[]) => void = () => {};

  // 初始化分布式数据库
  async init(context: Context): Promise<boolean> {
    try {
      Logger.info(TAG, '开始初始化分布式数据库');
      
      // 创建KVManager实例
      this.kvManager = distributedData.createKVManager({
        context: context,
        bundleName: 'com.example.myapp'
      });

      // 创建KVStore配置
      const options: distributedData.Options = {
        createIfMissing: true,    // 不存在时创建
        encrypt: false,           // 是否加密
        backup: false,            // 是否备份
        autoSync: true,           // 自动同步
        kvStoreType: distributedData.KVStoreType.SINGLE_VERSION,
        securityLevel: distributedData.SecurityLevel.S1
      };

      // 获取KVStore实例
      this.kvStore = await this.kvManager.getKVStore(STORE_ID, options);
      
      // 订阅数据变更
      this.subscribeDataChanges();
      
      Logger.info(TAG, '分布式数据库初始化成功');
      return true;
    } catch (error) {
      Logger.error(TAG, `初始化失败: ${(error as BusinessError).message}`);
      return false;
    }
  }

  // 订阅数据变更通知
  private subscribeDataChanges() {
    if (!this.kvStore) return;

    try {
      this.kvStore.on('dataChange', distributedData.SubscribeType.SUBSCRIBE_TYPE_ALL, (data) => {
        Logger.debug(TAG, `数据发生变化: ${JSON.stringify(data)}`);
        this.handleDataChange(data);
      });
      Logger.info(TAG, '数据变更监听器注册成功');
    } catch (error) {
      Logger.error(TAG, `注册数据变更监听失败: ${(error as BusinessError).message}`);
    }
  }

  // 处理数据变更
  private async handleDataChange(changeData: distributedData.ChangeData[]) {
    const entries: DistributedEntry[] = [];
    Logger.debug(TAG, `处理 ${changeData.length} 条数据变更`);
    
    for (const data of changeData) {
      try {
        const value = await this.kvStore?.get(data.key);
        entries.push({
          key: data.key,
          value: value,
          timestamp: Date.now(),
          deviceId: data.deviceId
        });
        Logger.debug(TAG, `处理键值变更: ${data.key}`);
      } catch (error) {
        Logger.error(TAG, `获取数据失败: ${(error as BusinessError).message}`);
      }
    }
    
    if (entries.length > 0) {
      this.syncCallback(entries);
    }
  }

  // 写入数据（自动同步到所有设备）
  async put(key: string, value: distributedData.ValueType): Promise<boolean> {
    if (!this.kvStore) {
      Logger.error(TAG, '数据库未初始化');
      return false;
    }

    try {
      await this.kvStore.put(key, value);
      Logger.debug(TAG, `数据写入成功: ${key} = ${value}`);
      return true;
    } catch (error) {
      Logger.error(TAG, `数据写入失败: ${(error as BusinessError).message}`);
      return false;
    }
  }

  // 读取数据（本地优先，支持跨设备读取）
  async get(key: string, defaultValue: distributedData.ValueType = ''): Promise<distributedData.ValueType> {
    if (!this.kvStore) {
      Logger.error(TAG, '数据库未初始化');
      return defaultValue;
    }

    try {
      const value = await this.kvStore.get(key);
      Logger.debug(TAG, `数据读取成功: ${key} = ${value}`);
      return value !== undefined ? value : defaultValue;
    } catch (error) {
      Logger.error(TAG, `数据读取失败: ${(error as BusinessError).message}`);
      return defaultValue;
    }
  }

  // 手动同步数据到所有设备
  async sync(): Promise<boolean> {
    if (!this.kvStore) {
      Logger.error(TAG, '数据库未初始化');
      return false;
    }

    try {
      Logger.info(TAG, '开始手动数据同步');
      await this.kvStore.sync(distributedData.SyncMode.PULL_ONLY, 5000);
      Logger.info(TAG, '数据同步完成');
      return true;
    } catch (error) {
      Logger.error(TAG, `数据同步失败: ${(error as BusinessError).message}`);
      return false;
    }
  }

  // 注册数据同步回调
  setSyncCallback(callback: (data: DistributedEntry[]) => void) {
    this.syncCallback = callback;
    Logger.debug(TAG, '数据同步回调函数已注册');
  }

  // 获取所有设备列表
  async getDeviceList(): Promise<string[]> {
    if (!this.kvStore) {
      Logger.warn(TAG, '数据库未初始化，返回空设备列表');
      return [];
    }

    try {
      const devices = await this.kvStore.getDeviceList();
      const deviceIds = devices.map(device => device.deviceId);
      Logger.debug(TAG, `获取到 ${deviceIds.length} 个设备`);
      return deviceIds;
    } catch (error) {
      Logger.error(TAG, `获取设备列表失败: ${(error as BusinessError).message}`);
      return [];
    }
  }

  // 清理资源
  async destroy() {
    if (this.kvManager && this.kvStore) {
      try {
        await this.kvManager.closeKVStore(this.kvStore);
        this.kvManager = null;
        this.kvStore = null;
        Logger.info(TAG, '数据库资源已释放');
      } catch (error) {
        Logger.error(TAG, `释放数据库资源失败: ${(error as BusinessError).message}`);
      }
    }
  }
}

export default new DataSyncManager();

1.2 跨设备协同服务

跨设备协同服务基于分布式设备管理（DeviceManager）实现，负责设备发现、认证和通信管理。

工作流程：

设备发现：通过蓝牙或Wi-Fi发现附近设备
设备认证：建立安全信任关系
会话管理：维护设备连接状态
数据路由：选择最优传输路径

// services/DeviceCollaborationService.ets
import deviceManager from '@ohos.distributedHardware.deviceManager';
import { BusinessError } from '@ohos.base';
import Logger from '../utils/Logger';

const TAG = '设备协同服务';

export interface DeviceInfo {
  deviceId: string;
  deviceName: string;
  deviceType: number;
  isOnline: boolean;
}

export class DeviceCollaborationService {
  private deviceManager: deviceManager.DeviceManager | null = null;
  private devices: Map<string, DeviceInfo> = new Map();
  private discoveryClass: number[] = [0, 1]; // 手机和平板设备

  // 初始化设备管理
  async init(context: Context): Promise<boolean> {
    try {
      Logger.info(TAG, '开始初始化设备管理器');
      this.deviceManager = await deviceManager.createDeviceManager(context.bundleName);
      this.registerListeners();
      await this.startDiscovery();
      Logger.info(TAG, '设备管理器初始化成功');
      return true;
    } catch (error) {
      Logger.error(TAG, `初始化设备管理器失败: ${(error as BusinessError).message}`);
      return false;
    }
  }

  // 注册设备监听器
  private registerListeners() {
    if (!this.deviceManager) return;

    // 设备状态变化监听
    this.deviceManager.on('deviceStateChange', (data) => {
      Logger.debug(TAG, `设备状态变化: ${data.device.deviceId}`);
      this.handleDeviceStateChange(data);
    });

    // 设备发现监听
    this.deviceManager.on('deviceFound', (data) => {
      Logger.info(TAG, `发现新设备: ${data.deviceName}`);
      this.handleDeviceFound(data);
    });

    // 设备丢失监听
    this.deviceManager.on('deviceLost', (data) => {
      Logger.info(TAG, `设备丢失: ${data.deviceName}`);
      this.handleDeviceLost(data);
    });

    Logger.info(TAG, '设备监听器注册完成');
  }

  // 开始设备发现
  private async startDiscovery(): Promise<void> {
    if (!this.deviceManager) return;

    try {
      await this.deviceManager.startDeviceDiscovery(this.discoveryClass);
      Logger.info(TAG, '设备发现服务已启动');
    } catch (error) {
      Logger.error(TAG, `启动设备发现失败: ${(error as BusinessError).message}`);
    }
  }

  // 处理设备状态变化
  private handleDeviceStateChange(data: deviceManager.DeviceStateChangeData) {
    const device = this.devices.get(data.device.deviceId);
    if (device) {
      device.isOnline = data.device.networkId !== undefined;
      Logger.debug(TAG, `设备 ${device.deviceName} 状态变更为: ${device.isOnline ? '在线' : '离线'}`);
    }
  }

  // 处理发现新设备
  private handleDeviceFound(data: deviceManager.DeviceInfo) {
    const deviceInfo: DeviceInfo = {
      deviceId: data.deviceId,
      deviceName: data.deviceName,
      deviceType: data.deviceType,
      isOnline: true
    };
    
    this.devices.set(data.deviceId, deviceInfo);
    Logger.debug(TAG, `设备信息已缓存: ${data.deviceName}`);
  }

  // 处理设备丢失
  private handleDeviceLost(data: deviceManager.DeviceInfo) {
    this.devices.delete(data.deviceId);
    Logger.debug(TAG, `设备信息已移除: ${data.deviceName}`);
  }

  // 获取所有在线设备
  getOnlineDevices(): DeviceInfo[] {
    const onlineDevices = Array.from(this.devices.values()).filter(device => device.isOnline);
    Logger.debug(TAG, `当前有 ${onlineDevices.length} 个在线设备`);
    return onlineDevices;
  }

  // 认证设备
  async authenticateDevice(deviceId: string): Promise<boolean> {
    if (!this.deviceManager) {
      Logger.error(TAG, '设备管理器未初始化');
      return false;
    }

    try {
      const authInfo = {
        deviceId: deviceId,
        authType: deviceManager.AuthType.PIN_CODE,
        authToken: '123456' // 实际应用中应该使用更安全的认证方式
      };

      await this.deviceManager.authenticateDevice(authInfo);
      Logger.info(TAG, `设备认证成功: ${deviceId}`);
      return true;
    } catch (error) {
      Logger.error(TAG, `设备认证失败: ${(error as BusinessError).message}`);
      return false;
    }
  }

  // 发送数据到指定设备
  async sendDataToDevice(deviceId: string, data: Object): Promise<boolean> {
    Logger.debug(TAG, `向设备 ${deviceId} 发送数据: ${JSON.stringify(data).substring(0, 100)}...`);
    // 实际实现需要基于分布式软总线
    return true;
  }

  // 清理资源
  async destroy() {
    if (this.deviceManager) {
      try {
        await this.deviceManager.stopDeviceDiscovery();
        this.deviceManager.release();
        this.deviceManager = null;
        Logger.info(TAG, '设备管理器资源已释放');
      } catch (error) {
        Logger.error(TAG, `释放设备管理器资源失败: ${(error as BusinessError).message}`);
      }
    }
  }
}

export default new DeviceCollaborationService();

二、分布式UI协同实现

2.1 跨设备组件同步

分布式UI组件能够实时同步状态和显示信息，为用户提供一致的跨设备体验。

// components/DistributedComponent.ets
import { DistributedEntry } from '../distributed/DataSyncManager';

@Component
export struct DistributedText {
  @Prop text: string = '';
  @State private deviceId: string = '';
  @State private timestamp: number = 0;

  build() {
    Column() {
      Text(this.text)
        .fontSize(18)
        .fontColor(Color.Black)
      
      if (this.deviceId) {
        Text(`来自设备: ${this.deviceId.slice(-8)}`)
          .fontSize(12)
          .fontColor(Color.Gray)
          .margin({ top: 4 })
      }
    }
    .padding(8)
    .border({ width: 1, color: Color.Blue })
    .borderRadius(8)
  }

  // 更新数据来源信息
  updateSource(entry: DistributedEntry) {
    this.deviceId = entry.deviceId;
    this.timestamp = entry.timestamp;
    console.log(`文本组件更新数据来源: 设备${entry.deviceId.slice(-8)}`);
  }
}

@Component
export struct DistributedButton {
  @Prop label: string = '';
  @Link @Watch('onDataChange') value: number;
  private key: string = '';

  aboutToAppear() {
    this.key = `button_${this.label}_value`;
    this.loadInitialValue();
    console.log(`分布式按钮组件初始化: ${this.label}`);
  }

  async loadInitialValue() {
    try {
      const storedValue = await DataSyncManager.get(this.key, 0);
      if (typeof storedValue === 'number') {
        this.value = storedValue;
        console.log(`加载初始值成功: ${this.label} = ${storedValue}`);
      }
    } catch (error) {
      console.error(`加载初始值失败: ${this.label}`);
    }
  }

  onDataChange() {
    console.log(`按钮值变化: ${this.label} = ${this.value}`);
    // 值变化时同步到所有设备
    DataSyncManager.put(this.key, this.value).then(success => {
      if (success) {
        console.log(`数据同步成功: ${this.key}`);
      } else {
        console.error(`数据同步失败: ${this.key}`);
      }
    });
  }

  build() {
    Button(this.label)
      .width(120)
      .height(40)
      .onClick(() => {
        console.log(`按钮点击: ${this.label}`);
        this.value++;
      })
  }
}

2.2 多设备协同页面

协同页面展示分布式能力，实时显示多设备状态和数据同步情况。

// pages/DistributedCollaborationPage.ets
import router from '@ohos.router';
import { DistributedEntry } from '../distributed/DataSyncManager';
import { DistributedText, DistributedButton } from '../components/DistributedComponent';

@Entry
@Component
struct DistributedCollaborationPage {
  @State sharedText: string = '多设备共享文本';
  @State counter: number = 0;
  @State recentUpdates: DistributedEntry[] = [];
  @State onlineDevices: string[] = [];
  @State syncStatus: string = '未同步';

  aboutToAppear() {
    console.log('分布式协同页面初始化');
    // 初始化分布式数据同步
    this.initDataSync();
    
    // 获取在线设备列表
    this.loadOnlineDevices();
  }

  async initDataSync() {
    console.log('初始化数据同步服务');
    
    // 设置数据同步回调
    DataSyncManager.setSyncCallback((entries: DistributedEntry[]) => {
      console.log(`收到 ${entries.length} 条数据更新`);
      this.recentUpdates = entries.slice(-5); // 显示最近5条更新
      this.syncStatus = `已同步 ${entries.length} 条数据`;
      
      // 更新共享文本
      const textEntry = entries.find(entry => entry.key === 'shared_text');
      if (textEntry && typeof textEntry.value === 'string') {
        this.sharedText = textEntry.value;
        console.log(`共享文本更新: ${textEntry.value}`);
      }
      
      // 更新计数器
      const counterEntry = entries.find(entry => entry.key === 'shared_counter');
      if (counterEntry && typeof counterEntry.value === 'number') {
        this.counter = counterEntry.value;
        console.log(`计数器更新: ${counterEntry.value}`);
      }
    });

    // 加载初始数据
    try {
      const initialText = await DataSyncManager.get('shared_text', '多设备共享文本');
      const initialCounter = await DataSyncManager.get('shared_counter', 0);
      
      if (typeof initialText === 'string') {
        this.sharedText = initialText;
        console.log(`加载初始文本: ${initialText}`);
      }
      if (typeof initialCounter === 'number') {
        this.counter = initialCounter;
        console.log(`加载初始计数: ${initialCounter}`);
      }
    } catch (error) {
      console.error('加载初始数据失败');
    }
  }

  async loadOnlineDevices() {
    console.log('加载在线设备列表');
    this.onlineDevices = await DataSyncManager.getDeviceList();
    console.log(`发现 ${this.onlineDevices.length} 个在线设备`);
  }

  build() {
    Column({ space: 20 }) {
      // 标题区域
      Text('多设备协同工作')
        .fontSize(24)
        .fontWeight(FontWeight.Bold)
        .margin({ bottom: 20 })

      // 同步状态显示
      Text(`同步状态: ${this.syncStatus}`)
        .fontSize(14)
        .fontColor(Color.Gray)

      // 共享文本编辑区域
      Row({ space: 10 }) {
        TextInput({ text: this.sharedText })
          .width('70%')
          .onChange((value: string) => {
            console.log(`文本输入: ${value}`);
            this.sharedText = value;
            DataSyncManager.put('shared_text', value).then(success => {
              if (success) {
                console.log('文本同步成功');
              }
            });
          })
        
        DistributedText({ text: this.sharedText })
          .width('30%')
      }

      // 分布式计数器
      Row({ space: 20 }) {
        DistributedButton({ label: '增加', value: $counter })
        Text(`计数: ${this.counter}`)
          .fontSize(18)
      }
      .margin({ top: 20 })

      // 在线设备列表
      if (this.onlineDevices.length > 0) {
        Column() {
          Text('在线设备:')
            .fontSize(16)
            .fontWeight(FontWeight.Medium)
            .margin({ bottom: 8 })
          
          ForEach(this.onlineDevices, (deviceId: string) => {
            Text(`设备: ${deviceId.slice(-8)}`)
              .fontSize(14)
              .fontColor(Color.Gray)
          })
        }
        .margin({ top: 20 })
      }

      // 最近更新记录
      if (this.recentUpdates.length > 0) {
        Column() {
          Text('最近更新:')
            .fontSize(16)
            .fontWeight(FontWeight.Medium)
            .margin({ bottom: 8 })
          
          ForEach(this.recentUpdates, (entry: DistributedEntry) => {
            Row({ space: 10 }) {
              Text(entry.key)
                .fontSize(12)
                .width('40%')
              Text(`${entry.value}`)
                .fontSize(12)
                .width('40%')
              Text(entry.deviceId.slice(-8))
                .fontSize(10)
                .width('20%')
            }
            .padding(4)
          })
        }
        .margin({ top: 20 })
      }

      // 手动同步按钮
      Button('手动同步数据')
        .width('80%')
        .margin({ top: 30 })
        .onClick(async () => {
          console.log('手动同步数据');
          this.syncStatus = '同步中...';
          const success = await DataSyncManager.sync();
          if (success) {
            this.syncStatus = '同步成功';
            console.log('手动同步完成');
          } else {
            this.syncStatus = '同步失败';
            console.error('手动同步失败');
          }
          await this.loadOnlineDevices();
        })
    }
    .padding(20)
    .width('100%')
    .height('100%')
    .backgroundColor('#F5F5F5')
  }

  onPageHide() {
    console.log('分布式协同页面隐藏');
    // 页面隐藏时清理资源
    DataSyncManager.setSyncCallback(() => {});
  }
}

三、高级特性与优化

3.1 数据同步策略优化

数据同步策略优化确保在不同网络条件下都能提供最佳的用户体验。

// strategies/SyncStrategy.ets
import { BusinessError } from '@ohos.base';

export enum SyncPriority {
  LOW = 0,     // 后台同步
  NORMAL = 1,  // 普通同步
  HIGH = 2,    // 实时同步
  CRITICAL = 3 // 关键数据立即同步
}

export class SyncStrategy {
  private static readonly BATCH_SIZE = 50;
  private static readonly SYNC_INTERVAL = 30000; // 30秒

  private pendingOperations: Map<string, {
    value: any;
    priority: SyncPriority;
    timestamp: number;
  }> = new Map();

  private syncTimer: number = -1;

  // 批量写入操作
  async batchPut(operations: Array<{key: string, value: any, priority: SyncPriority}>): Promise<boolean> {
    console.log(`开始批量处理 ${operations.length} 个操作`);
    const now = Date.now();
    
    operations.forEach(op => {
      this.pendingOperations.set(op.key, {
        value: op.value,
        priority: op.priority,
        timestamp: now
      });
      console.log(`操作已缓存: ${op.key} (优先级: ${op.priority})`);
    });

    // 根据优先级处理同步
    await this.processByPriority();
    return true;
  }

  // 按优先级处理同步
  private async processByPriority(): Promise<void> {
    const criticalOps = this.getOperationsByPriority(SyncPriority.CRITICAL);
    const highOps = this.getOperationsByPriority(SyncPriority.HIGH);
    const normalOps = this.getOperationsByPriority(SyncPriority.NORMAL);
    const lowOps = this.getOperationsByPriority(SyncPriority.LOW);

    // 立即同步关键数据
    if (criticalOps.length > 0) {
      await this.syncImmediate(criticalOps);
    }

    // 高性能同步高优先级数据
    if (highOps.length > 0) {
      await this.syncHighPriority(highOps);
    }

    // 批量处理普通数据
    if (normalOps.length > 0) {
      await this.syncNormalPriority(normalOps);
    }

    // 延迟处理低优先级数据
    if (lowOps.length > 0) {
      this.scheduleLowPrioritySync();
    }
  }

  // 立即同步
  private async syncImmediate(operations: Array<{key: string, value: any}>): Promise<void> {
    console.log(`立即同步 ${operations.length} 个关键数据`);
    for (const op of operations) {
      try {
        await DataSyncManager.put(op.key, op.value);
        this.pendingOperations.delete(op.key);
        console.log(`关键数据同步成功: ${op.key}`);
      } catch (error) {
        console.error(`关键数据同步失败: ${op.key}`);
      }
    }
  }

  // 高性能同步
  private async syncHighPriority(operations: Array<{key: string, value: any}>): Promise<void> {
    // 使用Promise.all并行处理
    const promises = operations.map(async (op) => {
      try {
        await DataSyncManager.put(op.key, op.value);
        this.pendingOperations.delete(op.key);
      } catch (error) {
        console.error(`High priority sync failed for key ${op.key}: ${(error as BusinessError).message}`);
      }
    });

    await Promise.all(promises);
  }

  // 普通优先级同步
  private async syncNormalPriority(operations: Array<{key: string, value: any}>): Promise<void> {
    // 分批处理避免性能问题
    for (let i = 0; i < operations.length; i += SyncStrategy.BATCH_SIZE) {
      const batch = operations.slice(i, i + SyncStrategy.BATCH_SIZE);
      await this.syncHighPriority(batch);
      await this.delay(100); // 添加小延迟避免阻塞
    }
  }

  // 调度低优先级同步
  private scheduleLowPrioritySync(): void {
    if (this.syncTimer !== -1) {
      clearTimeout(this.syncTimer);
    }

    this.syncTimer = setTimeout(async () => {
      const lowOps = this.getOperationsByPriority(SyncPriority.LOW);
      if (lowOps.length > 0) {
        await this.syncNormalPriority(lowOps);
      }
      this.syncTimer = -1;
    }, SyncStrategy.SYNC_INTERVAL) as unknown as number;
  }

  private getOperationsByPriority(priority: SyncPriority): Array<{key: string, value: any}> {
    return Array.from(this.pendingOperations.entries())
      .filter(([_, op]) => op.priority === priority)
      .map(([key, op]) => ({ key, value: op.value }));
  }

  private delay(ms: number): Promise<void> {
    return new Promise(resolve => setTimeout(resolve, ms));
  }

  // 清理资源
  destroy() {
    if (this.syncTimer !== -1) {
      clearTimeout(this.syncTimer);
      this.syncTimer = -1;
    }
    this.pendingOperations.clear();
  }
}

export default new SyncStrategy();

3.2 分布式事务管理

// distributed/TransactionManager.ets
import { BusinessError } from '@ohos.base';
import Logger from '../utils/Logger';

const TAG = 'TransactionManager';

export class DistributedTransaction {
  private operations: Array<{key: string, value: any}> = [];
  private committed: boolean = false;

  put(key: string, value: any): this {
    this.operations.push({ key, value });
    return this;
  }

  async commit(): Promise<boolean> {
    if (this.committed) {
      Logger.warn(TAG, '事务已提交');
      return false;
    }

    try {
      // 开始事务
      await this.beginTransaction();
      
      // 执行所有操作
      for (const op of this.operations) {
        await DataSyncManager.put(op.key, op.value);
      }
      
      // 提交事务
      await this.commitTransaction();
      this.committed = true;
      
      Logger.info(TAG, '事务提交成功');
      return true;
    } catch (error) {
      // 回滚事务
      await this.rollbackTransaction();
      Logger.error(TAG, `事务提交失败: ${(error as BusinessError).message}`);
      return false;
    }
  }

  private async beginTransaction(): Promise<void> {
    // 实际实现需要基于分布式事务协议
    Logger.debug(TAG, '开始分布式事务');
  }

  private async commitTransaction(): Promise<void> {
    // 实际实现需要基于分布式事务协议
    Logger.debug(TAG, '提交分布式事务');
  }

  private async rollbackTransaction(): Promise<void> {
    // 实际实现需要基于分布式事务协议
    Logger.debug(TAG, '回滚分布式事务');
  }
}

export class TransactionManager {
  static createTransaction(): DistributedTransaction {
    return new DistributedTransaction();
  }

  // 两阶段提交示例
  static async twoPhaseCommit(
    participants: Array<{deviceId: string, operation: () => Promise<boolean}>>
  ): Promise<boolean> {
    Logger.info(TAG, '启动两阶段提交');
    
    // 阶段一：准备阶段
    const prepareResults = await Promise.all(
      participants.map(async (participant, index) => {
        try {
          const prepared = await participant.operation();
          return { index, prepared, error: null };
        } catch (error) {
          return { index, prepared: false, error };
        }
      })
    );

    // 检查所有参与者是否准备就绪
    const allPrepared = prepareResults.every(result => result.prepared);
    
    if (!allPrepared) {
      // 阶段二：回滚
      Logger.warn(TAG, '准备阶段失败，正在回退');
      await this.rollbackAll(participants);
      return false;
    }

    // 阶段二：提交
    Logger.info(TAG, '全部就绪');
    // 实际实现中这里需要发送提交指令到所有参与者
    
    return true;
  }

  private static async rollbackAll(
    participants: Array<{deviceId: string, operation: () => Promise<boolean}>>
  ): Promise<void> {
    // 发送回滚指令到所有参与者
    Logger.debug(TAG, '发送回滚指令到所有参与者');
  }
}

四、性能监控与调试

4.1 分布式性能监控

// monitor/DistributedPerformanceMonitor.ets
import hiTraceMeter from '@ohos.hiTraceMeter';
import { BusinessError } from '@ohos.base';

export class PerformanceMetrics {
  syncLatency: number = 0;
  dataSize: number = 0;
  deviceCount: number = 0;
  successRate: number = 0;
  timestamp: number = 0;
}

export class DistributedPerformanceMonitor {
  private metrics: Map<string, PerformanceMetrics> = new Map();
  private traceId: string = '';

  // 开始性能跟踪
  startTrace(tag: string): void {
    this.traceId = hiTraceMeter.startTrace(tag);
  }

  // 结束性能跟踪
  endTrace(): void {
    if (this.traceId) {
      hiTraceMeter.finishTrace(this.traceId);
      this.traceId = '';
    }
  }

  // 记录同步性能指标
  recordSyncMetrics(key: string, metrics: Partial<PerformanceMetrics>): void {
    const existing = this.metrics.get(key) || new PerformanceMetrics();
    
    this.metrics.set(key, {
      ...existing,
      ...metrics,
      timestamp: Date.now()
    });

    this.logMetrics(key);
  }

  // 记录错误指标
  recordError(key: string, error: Error): void {
    const metrics = this.metrics.get(key) || new PerformanceMetrics();
    metrics.successRate = Math.max(0, metrics.successRate - 0.1);
    this.metrics.set(key, metrics);
  }

  // 获取性能报告
  getPerformanceReport(): Map<string, PerformanceMetrics> {
    return new Map(this.metrics);
  }

  // 清空指标数据
  clearMetrics(): void {
    this.metrics.clear();
  }

  private logMetrics(key: string): void {
    const metrics = this.metrics.get(key);
    if (metrics) {
      console.debug(`性能指标 ${key}: ${JSON.stringify(metrics)}`);
    }
  }

  // 监控分布式调用
  static async monitorDistributedCall<T>(
    operationName: string,
    operation: () => Promise<T>
  ): Promise<T> {
    const monitor = new DistributedPerformanceMonitor();
    monitor.startTrace(operationName);
    
    const startTime = Date.now();
    
    try {
      const result = await operation();
      const endTime = Date.now();
      
      monitor.recordSyncMetrics(operationName, {
        syncLatency: endTime - startTime,
        successRate: 1
      });
      
      return result;
    } catch (error) {
      const endTime = Date.now();
      
      monitor.recordSyncMetrics(operationName, {
        syncLatency: endTime - startTime,
        successRate: 0
      });
      
      monitor.recordError(operationName, error as Error);
      throw error;
    } finally {
      monitor.endTrace();
    }
  }
}

export default new DistributedPerformanceMonitor();

4.2 高级调试工具

// debug/DistributedDebugTool.ets
import { DistributedPerformanceMonitor } from '../monitor/DistributedPerformanceMonitor';

@Entry
@Component
struct DistributedDebugPage {
  @State performanceData: Map<string, any> = new Map();
  @State isMonitoring: boolean = false;

  private updateInterval: number = -1;

  aboutToAppear() {
    this.startMonitoring();
  }

  startMonitoring() {
    this.isMonitoring = true;
    this.updateInterval = setInterval(() => {
      this.performanceData = DistributedPerformanceMonitor.getPerformanceReport();
    }, 2000) as unknown as number;
  }

  stopMonitoring() {
    this.isMonitoring = false;
    if (this.updateInterval !== -1) {
      clearInterval(this.updateInterval);
      this.updateInterval = -1;
    }
  }

  build() {
    Column({ space: 10 }) {
      Text('分布式调试工具')
        .fontSize(20)
        .fontWeight(FontWeight.Bold)
        .margin({ bottom: 20 })

      // 性能指标显示
      ForEach(Array.from(this.performanceData.entries()), ([key, metrics]) => {
        Column() {
          Text(key)
            .fontSize(16)
            .fontWeight(FontWeight.Medium)
          
          Row({ space: 10 }) {
            Text(`延迟: ${metrics.syncLatency}ms`)
              .fontSize(12)
            Text(`成功率: ${(metrics.successRate * 100).toFixed(1)}%`)
              .fontSize(12)
          }
        }
        .padding(8)
        .border({ width: 1, color: Color.Gray })
        .width('100%')
      })

      // 控制按钮
      Row({ space: 20 }) {
        Button(this.isMonitoring ? '停止监控' : '开始监控')
          .onClick(() => {
            if (this.isMonitoring) {
              this.stopMonitoring();
            } else {
              this.startMonitoring();
            }
          })
        
        Button('清空数据')
          .onClick(() => {
            DistributedPerformanceMonitor.clearMetrics();
            this.performanceData.clear();
          })
      }
      .margin({ top: 20 })
    }
    .padding(20)
    .width('100%')
    .height('100%')
  }

  onPageHide() {
    this.stopMonitoring();
  }
}

五、安全与隐私保护

5.1 分布式数据加密

// security/DataEncryption.ets
import cryptoFramework from '@ohos.security.cryptoFramework';
import { BusinessError } from '@ohos.base';

export class DistributedDataEncryptor {
  private static readonly ALGORITHM = 'AES256';
  private static readonly KEY_SIZE = 256;

  // 生成加密密钥
  static async generateKey(): Promise<cryptoFramework.SymKey> {
    try {
      const generator = cryptoFramework.createSymKeyGenerator(this.ALGORITHM);
      return await generator.generateSymKey();
    } catch (error) {
      throw new Error(`生成失败: ${(error as BusinessError).message}`);
    }
  }

  // 加密数据
  static async encryptData(data: string, key: cryptoFramework.SymKey): Promise<string> {
    try {
      const cipher = cryptoFramework.createCipher(this.ALGORITHM);
      await cipher.init(cryptoFramework.CryptoMode.ENCRYPT_MODE, key, null);
      
      const input: cryptoFramework.DataBlob = { data: new Uint8Array(Buffer.from(data)) };
      const encrypted = await cipher.doFinal(input);
      
      return Buffer.from(encrypted.data).toString('base64');
    } catch (error) {
      throw new Error(`加密数据失败: ${(error as BusinessError).message}`);
    }
  }

  // 解密数据
  static async decryptData(encryptedData: string, key: cryptoFramework.SymKey): Promise<string> {
    try {
      const cipher = cryptoFramework.createCipher(this.ALGORITHM);
      await cipher.init(cryptoFramework.CryptoMode.DECRYPT_MODE, key, null);
      
      const input: cryptoFramework.DataBlob = { 
        data: new Uint8Array(Buffer.from(encryptedData, 'base64')) 
      };
      
      const decrypted = await cipher.doFinal(input);
      return Buffer.from(decrypted.data).toString('utf8');
    } catch (error) {
      throw new Error(`解密数据失败: ${(error as BusinessError).message}`);
    }
  }

  // 安全存储加密数据
  static async securePut(key: string, value: string, encryptionKey: cryptoFramework.SymKey): Promise<boolean> {
    try {
      const encryptedValue = await this.encryptData(value, encryptionKey);
      return await DataSyncManager.put(key, encryptedValue);
    } catch (error) {
      console.error(`安全存储失败: ${(error as BusinessError).message}`);
      return false;
    }
  }

  // 安全读取加密数据
  static async secureGet(key: string, encryptionKey: cryptoFramework.SymKey, defaultValue: string = ''): Promise<string> {
    try {
      const encryptedValue = await DataSyncManager.get(key, '');
      if (typeof encryptedValue === 'string' && encryptedValue) {
        return await this.decryptData(encryptedValue, encryptionKey);
      }
      return defaultValue;
    } catch (error) {
      console.error(`安全读取失败: ${(error as BusinessError).message}`);
      return defaultValue;
    }
  }
}