// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
namespace Microsoft.AspNetCore.Components.WebAssembly.Rendering;
 
internal sealed class NullDispatcher : Dispatcher
{
    public static readonly Dispatcher Instance = new NullDispatcher();
 
    private NullDispatcher()
    {
    }
 
    public override bool CheckAccess() => true;
 
    public override Task InvokeAsync(Action workItem)
    {
        ArgumentNullException.ThrowIfNull(workItem);
 
        workItem();
        return Task.CompletedTask;
    }
 
    public override Task InvokeAsync(Func<Task> workItem)
    {
        ArgumentNullException.ThrowIfNull(workItem);
 
        return workItem();
    }
 
    public override Task<TResult> InvokeAsync<TResult>(Func<TResult> workItem)
    {
        ArgumentNullException.ThrowIfNull(workItem);
 
        return Task.FromResult(workItem());
    }
 
    public override Task<TResult> InvokeAsync<TResult>(Func<Task<TResult>> workItem)
    {
        ArgumentNullException.ThrowIfNull(workItem);
 
        return workItem();
    }
}