C#•4mo ago

Queue Cancellationtoken

Hello! I have a little Problem I have a queue und want break a Download. In my item class is a canceltoken and I have in Service a cancellationsource. But If i break a Download up, all Downloads failed. But I want one download who I take the button press using the button Can anyone help me please? Here is a Code

10 Replies

SteffOP•4mo ago

public partial class Service : IService
{
    #region private Variable

    private Queue<Item> _downloadQueues = new Queue<Item>();

    private CancellationTokenSource _cancellationTokenSource = new CancellationTokenSource();
    
    private async Task Initialize(string traceID)
    {
        await ProcessQueueAsync(traceID);
    }

    #endregion

    #region Konstruktor 
    public Service()
    {
        string traceID = EX.GetTraceID();
        _ = Initialize(traceID);
    }
    #endregion

    #region Methoden

    public async Task AddToDownloadQueue(string traceID, Item item)
    {
        try
        {
            if (item is not null)
            {
                _downloadQueues.Enqueue(Item);
            }
            else
            {
                _logger.Error(traceID, $"AddToDownloadQueueAsync:: Item is null");
                return;
            }
        }
        catch (Exception ex)
        {
            _logger.Error(traceID, ex, $"AddDownloadToQueue:: ");
            return;
        }
    }

    public async Task CancelDownload()
    {
        _cancellationTokenSource.Cancel();
    }

    public async Task ProcessQueueAsync(string traceId)
    {
        while (!_cancellationTokenSource.IsCancellationRequested)
        {
            if (_downloadQueues.Count > 0)
            {
                try
                {
                    _waitTaskEventHandler.WaitOne(Constants.WAIT_FOR_CHECKQUEUE_IN_MS);
                    while (_downloadQueues.TryDequeue(out Item? Item))
                    {

                        Task? task = client.Download(traceId, Item, Item.CancellationToken);
                        await Task.Delay(1000);
                    }
                    _waitTaskEventHandler.Reset();
                }

public partial class Service : IService
{
    #region private Variable

    private Queue<Item> _downloadQueues = new Queue<Item>();

    private CancellationTokenSource _cancellationTokenSource = new CancellationTokenSource();
    
    private async Task Initialize(string traceID)
    {
        await ProcessQueueAsync(traceID);
    }

    #endregion

    #region Konstruktor 
    public Service()
    {
        string traceID = EX.GetTraceID();
        _ = Initialize(traceID);
    }
    #endregion

    #region Methoden

    public async Task AddToDownloadQueue(string traceID, Item item)
    {
        try
        {
            if (item is not null)
            {
                _downloadQueues.Enqueue(Item);
            }
            else
            {
                _logger.Error(traceID, $"AddToDownloadQueueAsync:: Item is null");
                return;
            }
        }
        catch (Exception ex)
        {
            _logger.Error(traceID, ex, $"AddDownloadToQueue:: ");
            return;
        }
    }

    public async Task CancelDownload()
    {
        _cancellationTokenSource.Cancel();
    }

    public async Task ProcessQueueAsync(string traceId)
    {
        while (!_cancellationTokenSource.IsCancellationRequested)
        {
            if (_downloadQueues.Count > 0)
            {
                try
                {
                    _waitTaskEventHandler.WaitOne(Constants.WAIT_FOR_CHECKQUEUE_IN_MS);
                    while (_downloadQueues.TryDequeue(out Item? Item))
                    {

                        Task? task = client.Download(traceId, Item, Item.CancellationToken);
                        await Task.Delay(1000);
                    }
                    _waitTaskEventHandler.Reset();
                }

Anton•4mo ago

how are items created

Unknown User•4mo ago

Message Not Public

SteffOP•4mo ago

So I will probably rewrite the entire service again But this is my Item Class:

    public partial class Item : ObservableObject
    {
        [ObservableProperty]
        public string fileName;

        [ObservableProperty]
        public Decimal progress;

        [ObservableProperty]
        public double totalBytes;

        [ObservableProperty]
        public Customer downloadCustomer;

        [ObservableProperty]
        public StatusDownloads status;

        [ObservableProperty]
        public CancellationToken cancellationToken;

        [ObservableProperty]
        public CancellationTokenSource cancellationTokenSource;

    public partial class Item : ObservableObject
    {
        [ObservableProperty]
        public string fileName;

        [ObservableProperty]
        public Decimal progress;

        [ObservableProperty]
        public double totalBytes;

        [ObservableProperty]
        public Customer downloadCustomer;

        [ObservableProperty]
        public StatusDownloads status;

        [ObservableProperty]
        public CancellationToken cancellationToken;

        [ObservableProperty]
        public CancellationTokenSource cancellationTokenSource;

Unknown User•4mo ago

Message Not Public

SteffOP•4mo ago

I am new to this field so please excuse my ignorance. So i can delete [ObservableProperty] from the CancellationToken and delete CancallationTokenSource, right ?

sibber•4mo ago

do you know what observable means? it means it will send notifications when the thing changes so when you mark property as observable, it will send a notification when you set it thats usually only used for ui updates

SteffOP•4mo ago

oh shit. I am really stupid

sibber•4mo ago

no youre just learning

SteffOP•4mo ago

Thanks all 🙂 ❤️

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Queue Cancellationtoken