software copyright
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jiahong
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/**
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* 自然写互动课堂教学管理云平台软件 V1.0
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*
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* 设备管理服务
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* 管理点阵笔、网关、终端设备、算力盒的全生命周期
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*/
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package com.writech.cloud.service;
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import com.writech.cloud.model.Device;
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import com.writech.cloud.controller.DeviceController.ClassroomTopology;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.data.domain.Page;
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import org.springframework.data.domain.Pageable;
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import org.springframework.data.redis.core.StringRedisTemplate;
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import org.springframework.stereotype.Service;
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import org.springframework.transaction.annotation.Transactional;
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import java.security.cert.X509Certificate;
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import java.time.LocalDateTime;
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import java.util.*;
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import java.util.stream.Collectors;
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/**
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* 设备服务类
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*
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* 管理互动课堂中所有硬件设备的注册、绑定、状态监控
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* 设备类型：pen(点阵笔) / gateway(网关) / terminal(终端) / edge_box(算力盒)
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*/
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@Service
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public class DeviceService {
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@Autowired
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private StringRedisTemplate redisTemplate;
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/** 设备在线超时时间（秒），超过此时间未收到心跳视为离线 */
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private static final long DEVICE_ONLINE_TIMEOUT = 120;
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/** 网关设备心跳间隔（秒） */
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private static final long GATEWAY_HEARTBEAT_INTERVAL = 30;
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/** 笔设备心跳间隔（秒） */
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private static final long PEN_HEARTBEAT_INTERVAL = 300;
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/**
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* 保存设备信息
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*/
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@Transactional
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public void save(Device device) {
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// deviceRepository.save(device);
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// 更新Redis中的设备在线状态缓存
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updateDeviceOnlineStatus(device.getId(), true);
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}
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/**
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* 根据ID查询设备
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*/
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public Device findById(String deviceId) {
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// return deviceRepository.findById(deviceId).orElse(null);
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return null;
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}
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/**
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* 根据MAC地址查询设备
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*/
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public Device findByMacAddr(String macAddr) {
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// return deviceRepository.findByMacAddr(macAddr);
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return null;
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}
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/**
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* 校验设备证书（X.509）
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* 首次注册时网关设备需提供预置的设备证书进行身份校验
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*
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* @param macAddr MAC地址
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* @param certPem PEM格式的X.509证书
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* @return 校验通过返回true
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*/
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public boolean validateDeviceCertificate(String macAddr, String certPem) {
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if (certPem == null || certPem.isEmpty()) {
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return false;
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}
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try {
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// 解析X.509证书
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java.security.cert.CertificateFactory cf =
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java.security.cert.CertificateFactory.getInstance("X.509");
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java.io.ByteArrayInputStream bis =
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new java.io.ByteArrayInputStream(certPem.getBytes());
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X509Certificate cert = (X509Certificate) cf.generateCertificate(bis);
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// 检查证书有效期
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cert.checkValidity();
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// 验证证书签名（使用CA根证书公钥）
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// cert.verify(caCertificate.getPublicKey());
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// 从证书CN字段提取MAC地址，与请求中的MAC地址比对
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String cn = cert.getSubjectX500Principal().getName();
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if (!cn.contains(macAddr.replace(":", "").toUpperCase())) {
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return false;
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}
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return true;
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} catch (Exception e) {
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return false;
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}
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}
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/**
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* 设备绑定
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* 将设备绑定至指定用户和教室
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*/
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@Transactional
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public void bindDevice(String deviceId, String userId, String classroomId) {
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// deviceRepository.updateBinding(deviceId, userId, classroomId);
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}
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/**
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* 设备解绑
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*/
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@Transactional
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public void unbindDevice(String deviceId) {
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// deviceRepository.clearBinding(deviceId);
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}
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/**
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* 分页查询设备列表
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* 支持按学校、教室、类型、状态多维度过滤
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*/
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public Page<Device> queryDevices(String schoolId, String classroomId,
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String deviceType, Integer status,
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Pageable pageable) {
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// return deviceRepository.queryByConditions(schoolId, classroomId,
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// deviceType, status, pageable);
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return null;
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}
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/**
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* 更新设备心跳
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* 心跳数据写入MySQL并更新Redis在线状态缓存
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*/
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public void updateHeartbeat(Device device) {
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// deviceRepository.updateHeartbeat(device.getId(),
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// device.getLastHeartbeat(), device.getBatteryLevel(),
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// device.getConnectedPenCount(), device.getCpuUsage(),
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// device.getMemoryUsage());
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// 更新Redis在线状态（设置过期时间为心跳超时时间）
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updateDeviceOnlineStatus(device.getId(), true);
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}
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/**
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* 构建教室设备拓扑
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* 查询教室内所有设备，按类型分组并建立连接关系
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*
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* @param classroomId 教室ID
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* @return 拓扑结构（网关/算力盒/终端/笔）
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*/
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public ClassroomTopology buildClassroomTopology(String classroomId) {
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// 查询教室下所有设备
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// List<Device> devices = deviceRepository.findByClassroomId(classroomId);
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List<Device> devices = new ArrayList<>();
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ClassroomTopology topology = new ClassroomTopology();
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topology.setClassroomId(classroomId);
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// 按设备类型分组
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Map<String, List<Device>> grouped = devices.stream()
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.collect(Collectors.groupingBy(Device::getType));
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topology.setGateways(grouped.getOrDefault("gateway", new ArrayList<>()));
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topology.setEdgeBoxes(grouped.getOrDefault("edge_box", new ArrayList<>()));
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topology.setTerminals(grouped.getOrDefault("terminal", new ArrayList<>()));
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topology.setPens(grouped.getOrDefault("pen", new ArrayList<>()));
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topology.setTotalDeviceCount(devices.size());
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return topology;
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}
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/**
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* 批量检查设备在线状态
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* 通过Redis缓存快速判断设备是否在线
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*/
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public Map<String, Boolean> checkOnlineStatus(List<String> deviceIds) {
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Map<String, Boolean> result = new HashMap<>();
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for (String deviceId : deviceIds) {
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String key = "writech:device:online:" + deviceId;
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result.put(deviceId, Boolean.TRUE.equals(redisTemplate.hasKey(key)));
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}
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return result;
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}
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/**
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* 发送远程指令至设备
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* 通过MQTT向指定设备下发控制指令（重启/配置更新/OTA等）
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*/
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public void sendCommand(String deviceId, String command, Map<String, Object> params) {
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// 构建MQTT消息
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Map<String, Object> message = new HashMap<>();
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message.put("command", command);
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message.put("params", params);
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message.put("timestamp", System.currentTimeMillis());
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// 根据设备类型确定Topic
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Device device = findById(deviceId);
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if (device == null) return;
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String topic;
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switch (device.getType()) {
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case "gateway":
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topic = "gateway/" + deviceId + "/command";
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break;
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case "edge_box":
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topic = "edgebox/" + deviceId + "/command";
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break;
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default:
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topic = "device/" + deviceId + "/command";
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}
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// mqttTemplate.convertAndSend(topic, message);
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}
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/**
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* 统计学校设备概况
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*/
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public DeviceOverview getSchoolDeviceOverview(String schoolId) {
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DeviceOverview overview = new DeviceOverview();
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// 各类型设备数量统计
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// overview.setTotalPens(deviceRepository.countBySchoolAndType(schoolId, "pen"));
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// overview.setTotalGateways(deviceRepository.countBySchoolAndType(schoolId, "gateway"));
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// overview.setOnlinePens(countOnlineDevices(schoolId, "pen"));
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// overview.setOnlineGateways(countOnlineDevices(schoolId, "gateway"));
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return overview;
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}
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// ==================== 内部方法 ====================
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/** 更新Redis中设备在线状态 */
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private void updateDeviceOnlineStatus(String deviceId, boolean online) {
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String key = "writech:device:online:" + deviceId;
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if (online) {
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redisTemplate.opsForValue().set(key, "1",
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DEVICE_ONLINE_TIMEOUT, java.util.concurrent.TimeUnit.SECONDS);
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} else {
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redisTemplate.delete(key);
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}
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}
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// ==================== 内部类 ====================
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/** 设备概况统计 */
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public static class DeviceOverview {
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private int totalPens;
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private int totalGateways;
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private int totalEdgeBoxes;
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private int totalTerminals;
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private int onlinePens;
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private int onlineGateways;
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private int onlineEdgeBoxes;
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private double averageBatteryLevel;
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public int getTotalPens() { return totalPens; }
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public void setTotalPens(int c) { this.totalPens = c; }
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public int getTotalGateways() { return totalGateways; }
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public void setTotalGateways(int c) { this.totalGateways = c; }
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public int getTotalEdgeBoxes() { return totalEdgeBoxes; }
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public void setTotalEdgeBoxes(int c) { this.totalEdgeBoxes = c; }
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public int getTotalTerminals() { return totalTerminals; }
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public void setTotalTerminals(int c) { this.totalTerminals = c; }
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public int getOnlinePens() { return onlinePens; }
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public void setOnlinePens(int c) { this.onlinePens = c; }
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public int getOnlineGateways() { return onlineGateways; }
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public void setOnlineGateways(int c) { this.onlineGateways = c; }
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public int getOnlineEdgeBoxes() { return onlineEdgeBoxes; }
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public void setOnlineEdgeBoxes(int c) { this.onlineEdgeBoxes = c; }
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public double getAverageBatteryLevel() { return averageBatteryLevel; }
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public void setAverageBatteryLevel(double l) { this.averageBatteryLevel = l; }
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}
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}
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