Base HostedService for Long Running Tasks

event-driven-architecture-base-hosted-task.cs

public abstract class MyBackgroundService : IHostedService, IDisposable
{
    private Task executingTask;
    private readonly CancellationTokenSource cancellationTokenSource = new CancellationTokenSource();
    protected abstract Task ExecuteAsync(CancellationToken stoppingToken);

    public virtual Task StartAsync(CancellationToken cancellationToken)
    {
        executingTask = ExecuteAsync(cancellationTokenSource.Token);

        if (executingTask.IsCompleted)
        {
            return executingTask;
        }

        return Task.CompletedTask;
    }

    public virtual async Task StopAsync(CancellationToken cancellationToken)
    {
        if (executingTask == null)
        {
            return;
        }

        try
        {
            cancellationTokenSource.Cancel();
        }
        finally
        {
            await Task.WhenAny(executingTask, Task.Delay(Timeout.Infinite, cancellationToken));
        }

    }

    public virtual void Dispose()
    {
        cancellationTokenSource.Cancel();
    }
}