Umbraco-CMS/src/Umbraco.Infrastructure/HostedServices/IBackgroundTaskQueue.cs

namespace Umbraco.Cms.Infrastructure.HostedServices;

/// <summary>
///     A Background Task Queue, to enqueue tasks for executing in the background.
/// </summary>
/// <remarks>
///     Borrowed from https://docs.microsoft.com/en-us/aspnet/core/fundamentals/host/hosted-services?view=aspnetcore-5.0
/// </remarks>
[Obsolete("This has been relocated into Umbraco.Cms.Core. This definition in Umbraco.Cms.Infrastructure is scheduled for removal in Umbraco 17.")]
public interface IBackgroundTaskQueue : Core.HostedServices.IBackgroundTaskQueue
{
    /// <summary>
    ///     Enqueue a work item to be executed in the background.
    /// </summary>
    void QueueBackgroundWorkItem(Func<CancellationToken, Task> workItem);

    /// <summary>
    ///     Dequeue the first item on the queue.
    /// </summary>
    Task<Func<CancellationToken, Task>?> DequeueAsync(CancellationToken cancellationToken);
}