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Add real-time dashboard updates with SignalR

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Integrate SignalR to provide real-time dashboard update notifications.
- Added DashboardsHub and DashboardChangeNotifier on the backend.
- Modified SqlDashboardStorage to trigger notifications on changes.
- Registered SignalR services and mapped the hub endpoint.
- Updated Blazor clients to connect to the hub and refresh dashboards on change.
- Added SignalR client packages and necessary DI/configuration.
This commit is contained in:
OlgunR
2026-02-04 09:01:28 +01:00
parent dbe1d9d206
commit 013088a25f
11 changed files with 138 additions and 7 deletions
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19
DbFirst.API/Dashboards/DashboardChangeNotifier.cs Normal file
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@@ -0,0 +1,19 @@
using DbFirst.API.Hubs;
using Microsoft.AspNetCore.SignalR;
namespace DbFirst.API.Dashboards;
public class DashboardChangeNotifier : IDashboardChangeNotifier
{
private readonly IHubContext<DashboardsHub> _hubContext;
public DashboardChangeNotifier(IHubContext<DashboardsHub> hubContext)
{
_hubContext = hubContext;
}
public void NotifyChanged()
{
_ = _hubContext.Clients.All.SendAsync("DashboardsChanged");
}
}

6
DbFirst.API/Dashboards/IDashboardChangeNotifier.cs Normal file
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@@ -0,0 +1,6 @@
namespace DbFirst.API.Dashboards;
public interface IDashboardChangeNotifier
{
void NotifyChanged();
}

8
DbFirst.API/Dashboards/SqlDashboardStorage.cs
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@@ -11,12 +11,14 @@ public sealed class SqlDashboardStorage : IEditableDashboardStorage
private readonly string _connectionString;
private readonly string _tableName;
private readonly Func<string?>? _userProvider;
private readonly IDashboardChangeNotifier? _notifier;
public SqlDashboardStorage(string connectionString, string tableName = "TBDD_SMF_CONFIG", Func<string?>? userProvider = null)
public SqlDashboardStorage(string connectionString, string tableName = "TBDD_SMF_CONFIG", Func<string?>? userProvider = null, IDashboardChangeNotifier? notifier = null)
{
_connectionString = connectionString;
_tableName = tableName;
_userProvider = userProvider;
_notifier = notifier;
}
public IEnumerable<DashboardInfo> GetAvailableDashboardsInfo()
@@ -98,6 +100,7 @@ public sealed class SqlDashboardStorage : IEditableDashboardStorage
connection.Open();
command.ExecuteNonQuery();
_notifier?.NotifyChanged();
return id;
}
@@ -118,6 +121,8 @@ public sealed class SqlDashboardStorage : IEditableDashboardStorage
{
throw new ArgumentException($"Dashboard '{dashboardId}' not found.");
}
_notifier?.NotifyChanged();
}
public void DeleteDashboard(string dashboardId)
@@ -128,5 +133,6 @@ public sealed class SqlDashboardStorage : IEditableDashboardStorage
connection.Open();
command.ExecuteNonQuery();
_notifier?.NotifyChanged();
}
}

7
DbFirst.API/Hubs/DashboardsHub.cs Normal file
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@@ -0,0 +1,7 @@
using Microsoft.AspNetCore.SignalR;
namespace DbFirst.API.Hubs;
public class DashboardsHub : Hub
{
}

8
DbFirst.API/Program.cs
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@@ -1,5 +1,6 @@
using DbFirst.API.Middleware;
using DbFirst.API.Dashboards;
using DbFirst.API.Hubs;
using DbFirst.Application;
using DbFirst.Application.Repositories;
using DbFirst.Domain;
@@ -53,6 +54,8 @@ builder.Services.AddApplication();
builder.Services.AddScoped<ICatalogRepository, CatalogRepository>();
builder.Services.AddDevExpressControls();
builder.Services.AddSignalR();
builder.Services.AddSingleton<IDashboardChangeNotifier, DashboardChangeNotifier>();
builder.Services.AddScoped<DashboardConfigurator>((IServiceProvider serviceProvider) => {
var dashboardsPath = Path.Combine(builder.Environment.ContentRootPath, "Data", "Dashboards");
Directory.CreateDirectory(dashboardsPath);
@@ -112,7 +115,8 @@ builder.Services.AddScoped<DashboardConfigurator>((IServiceProvider serviceProvi
DashboardConfigurator configurator = new DashboardConfigurator();
var connectionString = builder.Configuration.GetConnectionString("DefaultConnection") ?? string.Empty;
var dashboardStorage = new SqlDashboardStorage(connectionString, "TBDD_SMF_CONFIG");
var notifier = serviceProvider.GetRequiredService<IDashboardChangeNotifier>();
var dashboardStorage = new SqlDashboardStorage(connectionString, "TBDD_SMF_CONFIG", notifier: notifier);
configurator.SetDashboardStorage(dashboardStorage);
DataSourceInMemoryStorage dataSourceStorage = new DataSourceInMemoryStorage();
@@ -155,7 +159,7 @@ app.UseCors();
app.UseAuthorization();
app.MapDashboardRoute("api/dashboard", "DefaultDashboard");
app.MapHub<DashboardsHub>("/hubs/dashboards");
app.MapControllers();
app.Run();

1
DbFirst.BlazorWasm/DbFirst.BlazorWasm.csproj
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@@ -13,6 +13,7 @@
<PackageReference Include="DevExpress.Blazor.Themes.Fluent" Version="25.2.3" />
<PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly" Version="8.0.22" />
<PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly.DevServer" Version="8.0.22" PrivateAssets="all" />
<PackageReference Include="Microsoft.AspNetCore.SignalR.Client" Version="8.0.22" />
</ItemGroup>
<ItemGroup>

45
DbFirst.BlazorWasm/Pages/Dashboard.razor
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@@ -1,5 +1,6 @@
@page "/dashboard"
@page "/dashboards/{DashboardId?}"
@implements IAsyncDisposable
@inject Microsoft.Extensions.Configuration.IConfiguration Configuration
@inject NavigationManager Navigation
@inject DashboardApiClient DashboardApi
@@ -77,19 +78,38 @@
[SupplyParameterFromQuery] public string? Mode { get; set; }
private readonly List<DashboardInfoDto> dashboards = new();
private HubConnection? _hubConnection;
private bool IsDesigner => !string.Equals(Mode, "viewer", StringComparison.OrdinalIgnoreCase);
private WorkingMode CurrentMode => IsDesigner ? WorkingMode.Designer : WorkingMode.ViewerOnly;
private string SelectedDashboardId { get; set; } = "";
private string SelectedDashboardId { get; set; } = string.Empty;
private string DashboardKey => $"{SelectedDashboardId}-{(IsDesigner ? "designer" : "viewer")}";
private string DashboardEndpoint => $"{Configuration["ApiBaseUrl"]?.TrimEnd('/')}/api/dashboard";
private string HubEndpoint => $"{Configuration["ApiBaseUrl"]?.TrimEnd('/')}/hubs/dashboards";
protected override async Task OnInitializedAsync()
{
await RefreshDashboards();
_hubConnection = new HubConnectionBuilder()
.WithUrl(HubEndpoint)
.WithAutomaticReconnect()
.Build();
_hubConnection.On("DashboardsChanged", async () =>
{
await RefreshDashboards();
});
await _hubConnection.StartAsync();
}
protected override async Task OnParametersSetAsync()
{
if (dashboards.Count == 0)
{
dashboards.AddRange(await DashboardApi.GetAllAsync());
await RefreshDashboards();
}
var requestedId = string.IsNullOrWhiteSpace(DashboardId) || string.Equals(DashboardId, "default", StringComparison.OrdinalIgnoreCase)
@@ -119,4 +139,25 @@
var targetMode = IsDesigner ? "viewer" : "designer";
Navigation.NavigateTo($"dashboards/{SelectedDashboardId}?mode={targetMode}", replace: true);
}
private async Task RefreshDashboards()
{
var latest = await DashboardApi.GetAllAsync();
if (latest.Count == dashboards.Count && latest.All(d => dashboards.Any(x => x.Id == d.Id && x.Name == d.Name)))
{
return;
}
dashboards.Clear();
dashboards.AddRange(latest);
await InvokeAsync(StateHasChanged);
}
public async ValueTask DisposeAsync()
{
if (_hubConnection != null)
{
await _hubConnection.DisposeAsync();
}
}
}

1
DbFirst.BlazorWasm/_Imports.razor
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@@ -6,6 +6,7 @@
@using Microsoft.AspNetCore.Components.Web.Virtualization
@using Microsoft.AspNetCore.Components.WebAssembly.Http
@using Microsoft.JSInterop
@using Microsoft.AspNetCore.SignalR.Client
@using DbFirst.BlazorWasm
@using DbFirst.BlazorWasm.Layout
@using DbFirst.BlazorWasm.Models

45
DbFirst.BlazorWebApp/Components/Pages/Dashboard.razor
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@@ -1,5 +1,6 @@
@page "/dashboard"
@page "/dashboards/{DashboardId?}"
@implements IAsyncDisposable
@inject Microsoft.Extensions.Configuration.IConfiguration Configuration
@inject NavigationManager Navigation
@inject DashboardApiClient DashboardApi
@@ -77,19 +78,38 @@
[SupplyParameterFromQuery] public string? Mode { get; set; }
private readonly List<DashboardInfoDto> dashboards = new();
private HubConnection? _hubConnection;
private bool IsDesigner => !string.Equals(Mode, "viewer", StringComparison.OrdinalIgnoreCase);
private WorkingMode CurrentMode => IsDesigner ? WorkingMode.Designer : WorkingMode.ViewerOnly;
private string SelectedDashboardId { get; set; } = "";
private string SelectedDashboardId { get; set; } = string.Empty;
private string DashboardKey => $"{SelectedDashboardId}-{(IsDesigner ? "designer" : "viewer")}";
private string DashboardEndpoint => $"{Configuration["ApiBaseUrl"]?.TrimEnd('/')}/api/dashboard";
private string HubEndpoint => $"{Configuration["ApiBaseUrl"]?.TrimEnd('/')}/hubs/dashboards";
protected override async Task OnInitializedAsync()
{
await RefreshDashboards();
_hubConnection = new HubConnectionBuilder()
.WithUrl(HubEndpoint)
.WithAutomaticReconnect()
.Build();
_hubConnection.On("DashboardsChanged", async () =>
{
await RefreshDashboards();
});
await _hubConnection.StartAsync();
}
protected override async Task OnParametersSetAsync()
{
if (dashboards.Count == 0)
{
dashboards.AddRange(await DashboardApi.GetAllAsync());
await RefreshDashboards();
}
var requestedId = string.IsNullOrWhiteSpace(DashboardId) || string.Equals(DashboardId, "default", StringComparison.OrdinalIgnoreCase)
@@ -119,4 +139,25 @@
var targetMode = IsDesigner ? "viewer" : "designer";
Navigation.NavigateTo($"dashboards/{SelectedDashboardId}?mode={targetMode}", replace: true);
}
private async Task RefreshDashboards()
{
var latest = await DashboardApi.GetAllAsync();
if (latest.Count == dashboards.Count && latest.All(d => dashboards.Any(x => x.Id == d.Id && x.Name == d.Name)))
{
return;
}
dashboards.Clear();
dashboards.AddRange(latest);
await InvokeAsync(StateHasChanged);
}
public async ValueTask DisposeAsync()
{
if (_hubConnection != null)
{
await _hubConnection.DisposeAsync();
}
}
}

1
DbFirst.BlazorWebApp/Components/_Imports.razor
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@@ -6,6 +6,7 @@
@using static Microsoft.AspNetCore.Components.Web.RenderMode
@using Microsoft.AspNetCore.Components.Web.Virtualization
@using Microsoft.JSInterop
@using Microsoft.AspNetCore.SignalR.Client
@using DbFirst.BlazorWebApp
@using DbFirst.BlazorWebApp.Components
@using DbFirst.BlazorWebApp.Models

4
DbFirst.BlazorWebApp/DbFirst.BlazorWebApp.csproj
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@@ -12,5 +12,9 @@
<PackageReference Include="DevExpress.Blazor.Themes" Version="25.2.3" />
<PackageReference Include="DevExpress.Blazor.Themes.Fluent" Version="25.2.3" />
</ItemGroup>
<ItemGroup>
<PackageReference Include="DevExpress.Blazor" Version="25.2.3" />
<PackageReference Include="Microsoft.AspNetCore.SignalR.Client" Version="8.0.22" />
</ItemGroup>
</Project>