重新设计OpcUaBackgroundService后台服务

DMS.Infrastructure/Services/OptimizedOpcUaBackgroundService.cs

@@ -0,0 +1,156 @@
+using DMS.Application.DTOs;
+using DMS.Application.DTOs.Events;
+using DMS.Application.Interfaces;
+using DMS.Core.Enums;
+using DMS.Infrastructure.Interfaces.Services;
+using Microsoft.Extensions.Hosting;
+using Microsoft.Extensions.Logging;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace DMS.Infrastructure.Services
+{
+    /// <summary>
+    /// 优化后的OPC UA后台服务
+    /// </summary>
+    public class OptimizedOpcUaBackgroundService : BackgroundService
+    {
+        private readonly IDataCenterService _dataCenterService;
+        private readonly IOpcUaServiceManager _opcUaServiceManager;
+        private readonly ILogger<OptimizedOpcUaBackgroundService> _logger;
+        private readonly SemaphoreSlim _reloadSemaphore = new SemaphoreSlim(0);
+
+        public OptimizedOpcUaBackgroundService(
+            IDataCenterService dataCenterService,
+            IOpcUaServiceManager opcUaServiceManager,
+            ILogger<OptimizedOpcUaBackgroundService> logger)
+        {
+            _dataCenterService = dataCenterService ?? throw new ArgumentNullException(nameof(dataCenterService));
+            _opcUaServiceManager = opcUaServiceManager ?? throw new ArgumentNullException(nameof(opcUaServiceManager));
+            _logger = logger ?? throw new ArgumentNullException(nameof(logger));
+
+            _dataCenterService.DataLoadCompleted += OnDataLoadCompleted;
+        }
+
+        private void OnDataLoadCompleted(object sender, DataLoadCompletedEventArgs e)
+        {
+            _logger.LogInformation("收到数据加载完成通知，触发OPC UA服务重新加载");
+            _reloadSemaphore.Release();
+        }
+
+        protected override async Task ExecuteAsync(CancellationToken stoppingToken)
+        {
+            _logger.LogInformation("优化后的OPC UA后台服务正在启动...");
+
+            try
+            {
+                // 初始化服务管理器
+                await _opcUaServiceManager.InitializeAsync(stoppingToken);
+
+                while (!stoppingToken.IsCancellationRequested)
+                {
+                    await _reloadSemaphore.WaitAsync(stoppingToken);
+
+                    if (stoppingToken.IsCancellationRequested)
+                        break;
+
+                    if (_dataCenterService.Devices.IsEmpty)
+                    {
+                        _logger.LogInformation("没有可用的OPC UA设备，等待设备列表更新...");
+                        continue;
+                    }
+
+                    await LoadAndConnectDevicesAsync(stoppingToken);
+                }
+            }
+            catch (OperationCanceledException)
+            {
+                _logger.LogInformation("OPC UA后台服务已收到停止请求");
+            }
+            catch (Exception ex)
+            {
+                _logger.LogError(ex, "OPC UA后台服务运行时发生未处理的异常: {ErrorMessage}", ex.Message);
+            }
+            finally
+            {
+                _logger.LogInformation("正在清理OPC UA后台服务资源...");
+                // 服务管理器会在Dispose时自动清理资源
+            }
+
+            _logger.LogInformation("优化后的OPC UA后台服务已停止");
+        }
+
+        /// <summary>
+        /// 加载并连接设备
+        /// </summary>
+        private async Task LoadAndConnectDevicesAsync(CancellationToken stoppingToken)
+        {
+            _logger.LogInformation("开始加载和连接OPC UA设备...");
+
+            try
+            {
+                // 获取所有活动的OPC UA设备
+                var opcUaDevices = _dataCenterService.Devices.Values
+                    .Where(d => d.Protocol == ProtocolType.OpcUa && d.IsActive)
+                    .ToList();
+
+                _logger.LogInformation("找到 {DeviceCount} 个活动的OPC UA设备", opcUaDevices.Count);
+
+                if (opcUaDevices.Count == 0)
+                    return;
+
+                // 添加设备到监控列表
+                foreach (var device in opcUaDevices)
+                {
+                    _opcUaServiceManager.AddDevice(device);
+
+                    // 获取设备变量
+                    var variables = device.VariableTables?
+                        .SelectMany(vt => vt.Variables)
+                        .Where(v => v.IsActive && v.Protocol == ProtocolType.OpcUa)
+                        .ToList() ?? new List<VariableDto>();
+
+                    _opcUaServiceManager.UpdateVariables(device.Id, variables);
+                }
+
+                // 批量连接设备
+                var deviceIds = opcUaDevices.Select(d => d.Id).ToList();
+                await _opcUaServiceManager.ConnectDevicesAsync(deviceIds, stoppingToken);
+
+
+                _logger.LogInformation("OPC UA设备加载和连接完成");
+            }
+            catch (Exception ex)
+            {
+                _logger.LogError(ex, "加载和连接OPC UA设备时发生错误: {ErrorMessage}", ex.Message);
+            }
+        }
+
+        public override async Task StopAsync(CancellationToken cancellationToken)
+        {
+            _logger.LogInformation("正在停止OPC UA后台服务...");
+
+            // 释放信号量以确保ExecuteAsync可以退出
+            _reloadSemaphore.Release();
+
+            await base.StopAsync(cancellationToken);
+            
+            _logger.LogInformation("OPC UA后台服务停止完成");
+        }
+
+        public override void Dispose()
+        {
+            _logger.LogInformation("正在释放OPC UA后台服务资源...");
+            
+            _dataCenterService.DataLoadCompleted -= OnDataLoadCompleted;
+            _reloadSemaphore?.Dispose();
+            
+            base.Dispose();
+            
+            _logger.LogInformation("OPC UA后台服务资源已释放");
+        }
+    }
+}