电子阅览室管理挑战与有效解决方案

// 设备状态监控类
class DeviceMonitor {
  constructor() {
    this.devices = new Map();
    this.offlineThreshold = 300000; // 5分钟离线阈值
  }

  // 更新设备状态
  updateDeviceStatus(deviceId, status) {
    const deviceInfo = {
      status: status,
      lastUpdate: new Date(),
      isOnline: status === 'active'
    };
    this.devices.set(deviceId, deviceInfo);
  }

  // 检查离线设备
  checkOfflineDevices() {
    const now = new Date();
    const offlineDevices = [];
    
    for (const [deviceId, device] of this.devices) {
      const timeDiff = now - device.lastUpdate;
      if (timeDiff > this.offlineThreshold && device.isOnline) {
        offlineDevices.push(deviceId);
        device.isOnline = false;
      }
    }
    
    return offlineDevices;
  }

  // 获取设备统计信息
  getDeviceStatistics() {
    const total = this.devices.size;
    const online = Array.from(this.devices.values())
      .filter(device => device.isOnline).length;
    
    return {
      totalDevices: total,
      onlineDevices: online,
      offlineDevices: total - online,
      onlineRate: total > 0 ? (online / total * 100).toFixed(2) : 0
    };
  }
}

// 使用示例
const monitor = new DeviceMonitor();

// 资源访问权限管理类
public class ResourceAccessManager
{
    private readonly Dictionary> _rolePermissions;
    
    public ResourceAccessManager()
    {
        _rolePermissions = new Dictionary>
        {
            { "student", new List { "ebook", "journal", "database" } },
            { "teacher", new List { "ebook", "journal", "database", "research_data" } },
            { "admin", new List { "ebook", "journal", "database", "research_data", "system_config" } }
        };
    }

    // 检查用户对资源的访问权限
    public bool CheckAccessPermission(string userRole, string resourceType)
    {
        if (_rolePermissions.ContainsKey(userRole))
        {
            return _rolePermissions[userRole].Contains(resourceType);
        }
        return false;
    }

    // 获取用户可访问的所有资源类型
    public List GetAccessibleResources(string userRole)
    {
        return _rolePermissions.ContainsKey(userRole) 
            ? _rolePermissions[userRole] 
            : new List();
    }

    // 记录资源访问日志
    public void LogResourceAccess(string userId, string resourceId, DateTime accessTime)
    {
        // 实现资源访问日志记录逻辑
        // 可用于后续分析和审计
    }
}