Files
DMS/Services/OpcUaBackgroundService.cs

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using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
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using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.Extensions.Hosting;
using Opc.Ua;
using Opc.Ua.Client;
using Opc.Ua.Configuration;
using PMSWPF.Enums;
using PMSWPF.Helper;
using PMSWPF.Models;
namespace PMSWPF.Services
{
public class OpcUaBackgroundService
{
private readonly DataServices _dataServices;
// 存储 OPC UA 设备键为设备Id值为会话对象。
private readonly Dictionary<int, Device> _deviceDic;
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// 存储 OPC UA 会话,键为终结点 URL值为会话对象。
private readonly Dictionary<string, Session> _sessionsDic;
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// 存储 OPC UA 订阅,键为终结点 URL值为订阅对象。
private readonly Dictionary<string, Subscription> _subscriptionsDic;
// 存储活动的 OPC UA 变量键为变量的OpcNodeId
private readonly Dictionary<string, VariableData> _opcUaNodeIdVariableDic; // Key: VariableData.Id
// 储存所有要轮询更新的变量键是Device.Id,值是这个设备所有要轮询的变量
private readonly Dictionary<int, List<VariableData>> _pollVariableDic; // Key: VariableData.Id
// 储存所有要订阅更新的变量键是Device.Id,值是这个设备所有要轮询的变量
private readonly Dictionary<int, List<VariableData>> _subVariableDic;
// 后台服务的主线程,负责连接服务器,加载变量,订阅变量
private Thread _serviceMainThread;
// 轮询线程
private Thread _pollThread;
// 重新加载事件
private readonly ManualResetEvent _reloadEvent = new ManualResetEvent(false);
// 停止事件,触发后会停止整个Opc后台服务
private readonly ManualResetEvent _stopdEvent = new ManualResetEvent(false);
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/// <summary>
/// OpcUaBackgroundService 的构造函数。
/// </summary>
/// <param name="dataServices">数据服务,用于访问数据库中的变量信息。</param>
public OpcUaBackgroundService(DataServices dataServices)
{
_dataServices = dataServices;
_sessionsDic = new Dictionary<string, Session>();
_subscriptionsDic = new Dictionary<string, Subscription>();
_opcUaNodeIdVariableDic = new();
_pollVariableDic = new();
_subVariableDic = new();
_deviceDic = new();
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}
/// <summary>
/// 后台服务的主执行方法。
/// </summary>
/// <param name="stoppingToken">用于通知服务停止的取消令牌。</param>
/// <returns>表示异步操作的任务。</returns>
public void StartService()
{
NlogHelper.Info("OPC UA 服务正在启动...");
_reloadEvent.Set();
_serviceMainThread = new Thread(Execute);
_serviceMainThread.IsBackground = true;
_serviceMainThread.Name = "OpcUaServiceThread";
_serviceMainThread.Start();
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}
public void StopService()
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{
NlogHelper.Info("OPC UA 服务正在停止...");
_stopdEvent.Set();
DisconnectAllOpcUaSessions();
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_reloadEvent.Close();
_stopdEvent.Close();
NlogHelper.Info("OPC UA 服务已经停止。");
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}
private void Execute()
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{
// 订阅变量数据变化事件,以便在变量配置发生变化时重新加载。
_dataServices.OnDeviceListChanged += HandleDeviceListChanged;
while (!_stopdEvent.WaitOne(0))
{
_reloadEvent.WaitOne();
if (_dataServices.Devices == null || _dataServices.Devices.Count == 0)
{
_reloadEvent.Reset();
continue;
}
NlogHelper.Info("OpcUa后台服务开始加载变量...");
// 初始化时加载所有活动的 OPC UA 变量。
LoadOpcUaVariables();
//连接服务器
ConnectOpcUaService();
// // 添加订阅变量
SetupOpcUaSubscription();
if (_pollThread == null)
{
_pollThread = new Thread(PollOpcUaVariable);
_pollThread.IsBackground = true;
_pollThread.Name = "OpcUaPollThread";
_pollThread.Start();
}
NlogHelper.Info("OpcUa后台服务已启动。");
_reloadEvent.Reset();
}
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// 循环运行,直到接收到停止信号。
// while (!stoppingToken.IsCancellationRequested)
// {
// // 可以在这里添加周期性任务,例如检查和重新连接断开的会话。
// await Task.Delay(TimeSpan.FromSeconds(10), stoppingToken);
// }
NlogHelper.Info("OpcUa后台服务正在停止。");
// 服务停止时,取消订阅事件并断开所有 OPC UA 连接。
_dataServices.OnDeviceListChanged -= HandleDeviceListChanged;
}
private void HandleDeviceListChanged(List<Device> devices)
{
NlogHelper.Info("变量数据已更改。正在重新加载 OPC UA 变量。");
_reloadEvent.Set();
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}
/// <summary>
/// 从数据库加载所有活动的 OPC UA 变量,并进行相应的连接和订阅管理。
/// </summary>
private void LoadOpcUaVariables()
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{
try
{
var _opcUaDevices = _dataServices
.Devices.Where(d => d.ProtocolType == ProtocolType.OpcUA && d.IsActive == true)
.ToList();
if (_opcUaDevices.Count == 0)
return;
_deviceDic.Clear();
_pollVariableDic.Clear();
_subVariableDic.Clear();
_opcUaNodeIdVariableDic.Clear();
foreach (var opcUaDevice in _opcUaDevices)
{
// 将设备保存到字典中,方便之后查找
_deviceDic.Add(opcUaDevice.Id, opcUaDevice);
//查找设备中所有要轮询的变量
var dPollList = opcUaDevice.VariableTables?.SelectMany(vt => vt.DataVariables)
.Where(vd => vd.IsActive == true &&
vd.ProtocolType == ProtocolType.OpcUA &&
vd.OpcUaUpdateType == OpcUaUpdateType.OpcUaPoll)
.ToList();
// 将变量保存到字典中方便Read后还原
foreach (var variableData in dPollList)
{
_opcUaNodeIdVariableDic.Add(variableData.OpcUaNodeId, variableData);
}
NlogHelper.Info($"加载OpcUa轮询变量{dPollList.Count}个");
_pollVariableDic.Add(opcUaDevice.Id, dPollList);
//查找设备中所有要订阅的变量
var dSubList = opcUaDevice.VariableTables?.SelectMany(vt => vt.DataVariables)
.Where(vd => vd.IsActive == true &&
vd.ProtocolType == ProtocolType.OpcUA &&
vd.OpcUaUpdateType == OpcUaUpdateType.OpcUaSubscription)
.ToList();
_subVariableDic.Add(opcUaDevice.Id, dSubList);
NlogHelper.Info($"加载OpcUa订阅变量{dSubList.Count}个");
}
}
catch (Exception e)
{
NotificationHelper.ShowError($"加载OpcUa变量的过程中发生了错误{e.Message}");
}
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}
/// <summary>
/// 连接到 OPC UA 服务器并订阅或轮询指定的变量。
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/// </summary>
private void ConnectOpcUaService()
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{
foreach (Device device in _deviceDic.Values)
{
Session session = null;
// 检查是否已存在到该终结点的活动会话。
if (_sessionsDic.TryGetValue(device.OpcUaEndpointUrl, out session) && session.Connected)
{
NlogHelper.Info($"已连接到 OPC UA 服务器: {device.OpcUaEndpointUrl}");
continue;
}
session = ServiceHelper.CreateOpcUaSession(device.OpcUaEndpointUrl);
if (session == null)
return; // 连接失败,直接返回
_sessionsDic[device.OpcUaEndpointUrl] = session;
}
}
private void PollOpcUaVariable()
{
NlogHelper.Info("OpcUa轮询变量线程已启动开始轮询变量....");
while (!_stopdEvent.WaitOne(0))
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{
try
{
foreach (var deviceId in _pollVariableDic.Keys.ToList())
{
Thread.Sleep(100);
if (!_deviceDic.TryGetValue(deviceId, out var device) || device.OpcUaEndpointUrl == null)
{
NlogHelper.Warn(
$"OpcUa轮询变量时在deviceDic中未找到ID为 {deviceId} 的设备,或其服务器地址为空,请检查!");
continue;
}
_sessionsDic.TryGetValue(device.OpcUaEndpointUrl, out Session session);
if (session == null || !session.Connected)
{
if (!_stopdEvent.WaitOne(0))
{
NlogHelper.Warn(
$"用于 {device.OpcUaEndpointUrl} 的 OPC UA 会话未连接。正在尝试重新连接...");
// 尝试重新连接会话
ConnectOpcUaService();
continue;
}
}
var nodesToRead = new ReadValueIdCollection();
if (!_pollVariableDic.TryGetValue(deviceId, out var variableList))
{
continue;
}
foreach (var variable in variableList)
{
// 获取变量的轮询间隔。
if (!ServiceHelper.PollingIntervals.TryGetValue(variable.PollLevelType, out var interval))
{
NlogHelper.Info($"未知的轮询级别 {variable.PollLevelType},跳过变量 {variable.Name}。");
continue;
}
// 检查是否达到轮询时间。
if ((DateTime.Now - variable.UpdateTime) < interval)
continue; // 未到轮询时间,跳过。
nodesToRead.Add(new ReadValueId
{
NodeId = new NodeId(variable.OpcUaNodeId),
AttributeId = Attributes.Value
});
}
// 如果没有要读取的变量则跳过
if (nodesToRead.Count == 0)
continue;
session.Read(
null,
0,
TimestampsToReturn.Both,
nodesToRead,
out DataValueCollection results,
out DiagnosticInfoCollection diagnosticInfos);
if (results == null || results.Count == 0)
continue;
for (int i = 0; i < results.Count; i++)
{
var value = results[i];
var nodeId = nodesToRead[i]
.NodeId.ToString();
if (!_opcUaNodeIdVariableDic.TryGetValue(nodeId, out var variable))
{
NlogHelper.Warn(
$"在字典中未找到OpcUaNodeId为 {nodeId} 的变量对象!");
continue;
}
if (!StatusCode.IsGood(value.StatusCode))
{
NlogHelper.Warn(
$"读取 OPC UA 变量 {variable.Name} ({variable.OpcUaNodeId}) 失败: {value.StatusCode}");
continue;
}
// 更新变量数据
variable.DataValue = value.Value.ToString();
variable.DisplayValue = value.Value.ToString(); // 或者根据需要进行格式化
variable.UpdateTime = DateTime.Now;
NlogHelper.Info($"轮询变量:{variable.Name},值:{variable.DataValue}");
// Console.WriteLine($"结果变量跟更新时间:{variable.UpdateTime}");
// await _dataServices.UpdateVariableDataAsync(variable);
}
}
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}
catch (Exception ex)
{
NotificationHelper.ShowError($"OPC UA 轮询期间发生错误: {ex.Message}", ex);
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}
}
NlogHelper.Info("OpcUa轮询变量线程已停止。");
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}
/// <summary>
/// 订阅变量变化的通知
/// </summary>
/// <param name="monitoredItem"></param>
/// <param name="e"></param>
private void OnSubNotification(MonitoredItem monitoredItem, MonitoredItemNotificationEventArgs e)
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{
foreach (var value in monitoredItem.DequeueValues())
{
NlogHelper.Info(
$"[OPC UA 通知] {monitoredItem.DisplayName}: {value.Value} | 时间戳: {value.SourceTimestamp.ToLocalTime()} | 状态: {value.StatusCode}");
Console.WriteLine(
$"[通知] {monitoredItem.DisplayName}: {value.Value} | 时间戳: {value.SourceTimestamp.ToLocalTime()} | 状态: {value.StatusCode}");
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}
}
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/// <summary>
/// 断开所有 OPC UA 会话。
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/// </summary>
private void DisconnectAllOpcUaSessions()
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{
NlogHelper.Info("正在断开所有 OPC UA 会话...");
foreach (var endpointUrl in _sessionsDic.Keys.ToList())
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{
NlogHelper.Info($"正在断开 OPC UA 会话: {endpointUrl}");
if (_sessionsDic.TryGetValue(endpointUrl, out var session))
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{
if (_subscriptionsDic.TryGetValue(endpointUrl, out var subscription))
{
// 删除订阅。
subscription.Delete(true);
_subscriptionsDic.Remove(endpointUrl);
}
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// 关闭会话。
session.Close();
_sessionsDic.Remove(endpointUrl);
NotificationHelper.ShowInfo($"已从 OPC UA 服务器断开连接: {endpointUrl}");
}
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}
}
/// <summary>
/// 设置 OPC UA 订阅并添加监控项。
/// </summary>
/// <param name="session">OPC UA 会话。</param>
/// <param name="variable">要订阅的变量信息。</param>
/// <param name="endpointUrl">OPC UA 服务器的终结点 URL。</param>
private void SetupOpcUaSubscription()
{
foreach (var deviceId in _subVariableDic.Keys)
{
var device = _dataServices.Devices.FirstOrDefault(d => d.Id == deviceId);
Subscription subscription = null;
// 得到session
if (!_sessionsDic.TryGetValue(device.OpcUaEndpointUrl, out var session))
{
NlogHelper.Info($"从OpcUa会话字典中获取会话失败 {device.OpcUaEndpointUrl} ");
continue;
}
// 判断设备是否已经添加了订阅
if (_subscriptionsDic.TryGetValue(device.OpcUaEndpointUrl, out subscription))
{
NlogHelper.Info($"OPC UA 终结点 {device.OpcUaEndpointUrl} 已存在订阅。");
}
else
{
subscription = new Subscription(session.DefaultSubscription);
subscription.PublishingInterval = 1000; // 发布间隔(毫秒)
session.AddSubscription(subscription);
subscription.Create();
_subscriptionsDic[device.OpcUaEndpointUrl] = subscription;
}
// 将变量添加到订阅
foreach (VariableData variable in _subVariableDic[deviceId])
{
// 7. 创建监控项并添加到订阅中。
MonitoredItem monitoredItem = new MonitoredItem(subscription.DefaultItem);
monitoredItem.DisplayName = variable.Name;
monitoredItem.StartNodeId = new NodeId(variable.OpcUaNodeId); // 设置要监控的节点 ID
monitoredItem.AttributeId = Attributes.Value; // 监控节点的值属性
monitoredItem.SamplingInterval = 1000; // 采样间隔(毫秒)
monitoredItem.QueueSize = 1; // 队列大小
monitoredItem.DiscardOldest = true; // 丢弃最旧的数据
// 注册数据变化通知事件。
monitoredItem.Notification += OnSubNotification;
subscription.AddItem(monitoredItem);
subscription.ApplyChanges(); // 应用更改
}
NlogHelper.Info($"设备: {device.Name}, 添加了 {(_subVariableDic[deviceId]?.Count ?? 0)} 个订阅变量。");
}
}
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}
}