Shiny.Mediator
1.0.0-alpha-0038
Prefix Reserved
See the version list below for details.
dotnet add package Shiny.Mediator --version 1.0.0-alpha-0038
NuGet\Install-Package Shiny.Mediator -Version 1.0.0-alpha-0038
<PackageReference Include="Shiny.Mediator" Version="1.0.0-alpha-0038" />
paket add Shiny.Mediator --version 1.0.0-alpha-0038
#r "nuget: Shiny.Mediator, 1.0.0-alpha-0038"
// Install Shiny.Mediator as a Cake Addin #addin nuget:?package=Shiny.Mediator&version=1.0.0-alpha-0038&prerelease // Install Shiny.Mediator as a Cake Tool #tool nuget:?package=Shiny.Mediator&version=1.0.0-alpha-0038&prerelease
Shiny Mediator (Preview)
PLEASE NOTE - THIS IS AN ALPHA. THINGS ARE LIKELY TO CHANGE
<a href="https://www.nuget.org/packages/Shiny.Mediator" target="_blank"> <img src="https://buildstats.info/nuget/Shiny.Mediator?includePreReleases=true" /> </a>
A mediator pattern, but for apps. Apps have pages with lifecycles that don't necessarily participate in the standard dependency injection lifecycle. .NET MAUI generally tends to favor the Messenger pattern. We hate this pattern for many reasons which we won't get into. That being said, we do offer a messenger subscription in our Mediator for where interfaces and dependency injection can't reach.
This project is heavily inspired by MediatR with some lesser features that we feel were aimed more at server scenarios, while also adding some features we feel benefit apps
Features
- A Mediator for your .NET Apps (MAUI & Blazor are the main targets for us)
- Request & event middleware with some great "out of the box" scenarios for your app
- Think of "weak" message subscriptions without the fuss or mess to cleanup
- Our MAUI & Blazor integrations allow your viewmodels or pages to implement an IEventHandler<TEvent> interface(s) without them having to participate in the dependency injection provider
- We still have a "messagingcenter" type subscribe off IMediator for cases where you can't have your current type implement an interface
- Instead of Assembly Scanning, we have source generators to automatically wireup the necessary registrations for you! (WIP)
- Lightweight, No external dependencies, tiny bit of reflection
- Help remove service overrun and reduce your constructor fat
- Easy to Unit Test
Works With
- .NET MAUI - all platforms
- MVVM Frameworks like Prism, ReactiveUI, & .NET MAUI Shell
- Blazor - Work In Progress
- Any other .NET platform - but you'll have to come up with your own "event collector" for the out-of-state stuff
Getting Started
Install Shiny.Mediator from NuGet
First, let's create our request & event handlers
using Shiny.Mediator;
public record TestRequest(string AnyArgs, int YouWant) : IRequest;
public record TestEvent(MyObject AnyArgs) : IEvent;
// and for request/response requests - we'll come back to this
public record TestResponseRequest : IRequest<TestResponse> {}
public record TestResponse {}
Next - let's wire up a RequestHandler. You can have ONLY 1 request handler per request type. This is where you would do the main business logic or data requests.
Let's create our RequestHandler
using Shiny.Mediator;
// NOTE: Request handlers are registered as singletons
public class TestRequestHandler : IRequestHandler<TestRequest>
{
// you can do all dependency injection here
public async Task Handle(TestRequest request, CancellationToken ct)
{
// do something async here
}
}
public class TestResponseRequestHandler : IRequestHandler<TestResponseRequest, TestResponse>
{
public async Task<TestResponse> Handle(TestResponseRequest request, CancellationToken ct)
{
var response = await GetResponseThing(ct);
return response;
}
}
public class TestEventHandler : IEventHandler<TestEvent>
{
// Dependency injection works here
public async Task Handle(TestEvent @event, CancellationToken ct)
{
// Do something async here
}
}
Now, let's register all of our stuff with our .NET MAUI MauiProgram.cs
public static class MauiProgram
{
public static MauiApp CreateMauiApp()
{
var builder = MauiApp
.CreateBuilder()
.UseMauiApp<App>();
builder.Services.AddShinyMediator();
builder.Services.AddSingletonAsImplementedInterfaces<TestEventHandler>();
builder.Services.AddSingletonAsImplementedInterfaces<TestRequestHandler>();
builder.Services.AddSingltonAsImplementedInterfaces<TestResponseRequestHandler>();
// OR if you're using our attribute for source generation
}
}
Lastly, any model model/viewmodel/etc participating in dependency injection can now inject the mediator
public class MyViewModel(Shiny.Mediator.IMediator mediator)
{
public async Task Execute()
{
await mediator.Send(new TestRequest()); // this will execute TestRequestHandler
var response = await mediator.Request(new TestResponseRequest()); // this will execute TestResponseRequestHandler and return a value
// this will publish to any service registered that implement IEventHandler<TestEvent>
// there are additional args here to allow you to execute values in sequentially or wait for all events to complete
await mediator.Publish(new TestEvent());
}
}
What about my ViewModels?
For .NET MAUI, your viewmodels have the ability to participate in the event publishing chain without being part of dependency injection
With this setup, you don't need to worry about deallocating any events, unsubscribing from some service, or hooking to anything.
Lastly, if your page/viewmodel is navigated away from (popped), it will no longer participate in the event broadcast
First, let's install Shiny.Mediator.Maui Now...let's go back to our MauiProgram.cs and alter the AddShinyMediator
builder.Services.AddShinyMediator(cfg => cfg.UseMaui());
Now your viewmodel (or page) can simply implement the IEventHandler<T> interface to participate
NOTE: Further example to below - you can implement multiple event handlers (or request handlers)
public class MyViewModel : BaseViewModel,
Shiny.Mediator.IEventHandler<TestEvent>,
Shiny.Mediator.IEventHandler<TestEvent>
{
public async Task Handle(TestEvent @event, CancellationToken ct)
{
}
public async Task Handle(TestEvent2 @event, CancellationToken ct)
{
}
}
Sample
There is a sample in this repo. You do not need any other part of Shiny, Prism, ReactiveUI, etc - those are included as I write things faster with it. Focus on the interfaces from the mediator & the mediator calls itself
Ideas for Workflows Request & Events
- Use Prism with Modules - want strongly typed navigation parameters, navigations, and have them available to other modules - we're the guy to help!
- Example TBD
- Using a Shiny Foreground Job - want to push data an event that new data came in to anyone listening?
- Have a Shiny Push Delegate that is executing on the delegate but want to push it to the UI, Mediator has a plan!
TODO
- Document
- Event Collectors
- Request Middleware
- Covariance Event Handlers & Request Middleware - Dependency Injection Support - nothing to do with the library
- OOBE Middleware - easy, not feature rich - use as a template once you outgrow them
- Event Collectors for MAUI execute on main thread?
- Streams - IAsyncEnumerable or IObservable
- Source Generator Registration
- Need to use a different method or not use extension methods - maybe AddHandlersFromAssemblyName or allow it to be custom named
Product | Versions Compatible and additional computed target framework versions. |
---|---|
.NET | net8.0 is compatible. net8.0-android was computed. net8.0-browser was computed. net8.0-ios was computed. net8.0-maccatalyst was computed. net8.0-macos was computed. net8.0-tvos was computed. net8.0-windows was computed. |
-
net8.0
- Microsoft.Extensions.DependencyInjection (>= 8.0.0)
- Shiny.Mediator.Contracts (>= 1.0.0-alpha-0038)
NuGet packages (8)
Showing the top 5 NuGet packages that depend on Shiny.Mediator:
Package | Downloads |
---|---|
Shiny.Mediator.Maui
Shiny Mediator - A mediator pattern for all .NET Apps |
|
Shiny.Mediator.Blazor
Shiny Mediator - A mediator pattern for all .NET Apps |
|
Shiny.Mediator.Resilience
Shiny Mediator - A mediator pattern for all .NET Apps |
|
Shiny.Mediator.Caching
Shiny Mediator - A mediator pattern for all .NET Apps |
|
Shiny.Mediator.Prism
Shiny Mediator - A mediator pattern for all .NET Apps |
GitHub repositories
This package is not used by any popular GitHub repositories.
Version | Downloads | Last updated |
---|---|---|
2.2.0-beta-0001 | 121 | 10/28/2024 |
2.1.1 | 130 | 10/28/2024 |
2.1.0 | 161 | 10/19/2024 |
2.1.0-beta-0016 | 113 | 10/19/2024 |
2.1.0-beta-0015 | 116 | 10/19/2024 |
2.1.0-beta-0014 | 130 | 10/19/2024 |
2.1.0-beta-0013 | 127 | 10/19/2024 |
2.1.0-beta-0011 | 142 | 10/18/2024 |
2.1.0-beta-0010 | 136 | 10/18/2024 |
2.1.0-beta-0004 | 117 | 10/8/2024 |
2.1.0-beta-0002 | 112 | 10/6/2024 |
2.0.2 | 342 | 10/6/2024 |
2.0.1 | 131 | 10/6/2024 |
2.0.0 | 179 | 10/4/2024 |
2.0.0-beta-0060 | 111 | 10/6/2024 |
2.0.0-beta-0059 | 107 | 10/6/2024 |
2.0.0-beta-0056 | 110 | 10/4/2024 |
2.0.0-beta-0054 | 120 | 10/3/2024 |
2.0.0-beta-0053 | 116 | 10/2/2024 |
2.0.0-beta-0052 | 122 | 10/2/2024 |
2.0.0-beta-0050 | 116 | 10/2/2024 |
2.0.0-beta-0049 | 123 | 10/2/2024 |
2.0.0-beta-0046 | 126 | 10/1/2024 |
2.0.0-beta-0044 | 114 | 9/30/2024 |
2.0.0-beta-0026 | 128 | 9/24/2024 |
2.0.0-beta-0023 | 116 | 9/23/2024 |
2.0.0-beta-0022 | 102 | 9/23/2024 |
2.0.0-beta-0020 | 113 | 9/22/2024 |
2.0.0-beta-0004 | 116 | 9/20/2024 |
2.0.0-beta-0003 | 125 | 9/20/2024 |
1.9.0-beta-0003 | 126 | 9/16/2024 |
1.9.0-beta-0001 | 132 | 9/15/2024 |
1.9.0-beta | 130 | 9/15/2024 |
1.8.1 | 311 | 9/14/2024 |
1.8.1-beta-0006 | 125 | 9/14/2024 |
1.8.1-beta-0005 | 134 | 9/14/2024 |
1.8.1-beta-0004 | 124 | 9/14/2024 |
1.8.1-beta-0003 | 130 | 9/14/2024 |
1.8.1-beta-0002 | 128 | 9/14/2024 |
1.8.1-beta-0001 | 133 | 9/14/2024 |
1.8.0 | 178 | 9/12/2024 |
1.8.0-beta-0064 | 133 | 9/12/2024 |
1.8.0-beta-0063 | 151 | 9/12/2024 |
1.8.0-beta-0059 | 132 | 9/8/2024 |
1.8.0-beta-0058 | 126 | 9/8/2024 |
1.8.0-beta-0057 | 135 | 9/8/2024 |
1.8.0-beta-0054 | 154 | 9/7/2024 |
1.8.0-beta-0053 | 152 | 9/6/2024 |
1.8.0-beta-0052 | 141 | 9/6/2024 |
1.8.0-beta-0051 | 145 | 9/6/2024 |
1.8.0-beta-0044 | 151 | 9/5/2024 |
1.8.0-beta-0042 | 143 | 9/4/2024 |
1.8.0-beta-0041 | 137 | 9/4/2024 |
1.8.0-beta-0027 | 162 | 8/25/2024 |
1.8.0-beta-0022 | 158 | 8/23/2024 |
1.8.0-beta-0017 | 130 | 8/7/2024 |
1.8.0-beta-0012 | 95 | 7/28/2024 |
1.8.0-beta-0010 | 83 | 7/28/2024 |
1.7.5 | 200 | 8/23/2024 |
1.7.4 | 207 | 8/9/2024 |
1.7.3 | 158 | 8/7/2024 |
1.7.2 | 117 | 7/28/2024 |
1.7.1 | 99 | 7/28/2024 |
1.7.0 | 157 | 7/20/2024 |
1.7.0-beta-0005 | 110 | 7/20/2024 |
1.7.0-beta-0001 | 123 | 7/8/2024 |
1.6.0 | 163 | 7/8/2024 |
1.6.0-beta-0004 | 115 | 7/7/2024 |
1.5.0 | 145 | 7/6/2024 |
1.5.0-beta-0010 | 124 | 7/6/2024 |
1.5.0-beta-0006 | 115 | 7/4/2024 |
1.4.5 | 137 | 7/4/2024 |
1.4.2 | 144 | 6/30/2024 |
1.4.1 | 141 | 6/30/2024 |
1.4.0 | 140 | 6/30/2024 |
1.4.0-beta-0010 | 132 | 6/30/2024 |
1.3.1 | 129 | 6/29/2024 |
1.3.0 | 130 | 6/29/2024 |
1.3.0-beta-0014 | 114 | 6/29/2024 |
1.3.0-beta-0007 | 109 | 6/26/2024 |
1.2.0 | 133 | 6/20/2024 |
1.2.0-beta-0001 | 93 | 6/20/2024 |
1.1.0 | 123 | 6/17/2024 |
1.1.0-beta-0019 | 109 | 6/20/2024 |
1.1.0-beta-0016 | 113 | 6/19/2024 |
1.1.0-beta-0014 | 122 | 6/17/2024 |
1.1.0-beta-0013 | 123 | 6/17/2024 |
1.0.0 | 137 | 6/15/2024 |
1.0.0-alpha-0054 | 118 | 6/15/2024 |
1.0.0-alpha-0053 | 118 | 6/12/2024 |
1.0.0-alpha-0051 | 102 | 6/12/2024 |
1.0.0-alpha-0048 | 111 | 6/10/2024 |
1.0.0-alpha-0047 | 120 | 6/10/2024 |
1.0.0-alpha-0043 | 108 | 6/9/2024 |
1.0.0-alpha-0042 | 133 | 6/7/2024 |
1.0.0-alpha-0040 | 118 | 6/6/2024 |
1.0.0-alpha-0038 | 113 | 6/6/2024 |
1.0.0-alpha-0036 | 103 | 6/5/2024 |
1.0.0-alpha-0034 | 127 | 6/4/2024 |
1.0.0-alpha-0031 | 111 | 6/4/2024 |
1.0.0-alpha-0025 | 111 | 6/3/2024 |
1.0.0-alpha-0023 | 118 | 6/2/2024 |
1.0.0-alpha-0022 | 120 | 6/1/2024 |
1.0.0-alpha-0019 | 115 | 6/1/2024 |
1.0.0-alpha-0018 | 102 | 6/1/2024 |
1.0.0-alpha-0014 | 118 | 6/1/2024 |
1.0.0-alpha-0013 | 100 | 6/1/2024 |
1.0.0-alpha-0012 | 106 | 5/31/2024 |
1.0.0-alpha-0011 | 101 | 5/31/2024 |
1.0.0-alpha-0010 | 105 | 5/31/2024 |