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Batch processing JMS events in event handling


Batch processing JMS events in event handling

By : Matilda Mazari
Date : November 18 2020, 01:01 AM
Hope that helps After some tuning, rather than scheduling a periodic bulk processing at a fixed rate, I ended up scheduling one task with a brief delay during the callback. This allows ample time for all related events to arrive into the cache. And once all events in the cache are bulk processed, the cache is cleared, so there is no more to process for the following scheduled tasks (one task scheduled during each callback). The task will resume processing once the cache is filled again.
Of course, the cache need to be made thread safe. I think this approach works the best for my scenario, where short sequences of events arrive in an irregular pace.
code :


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Why should I implement all event-handling methods, while handling events in a subclass of UIView?

Why should I implement all event-handling methods, while handling events in a subclass of UIView?


By : user1910725
Date : March 29 2020, 07:55 AM
I hope this helps you . From the guide:
How to handle processing real-time events that fire before processing of previous event is complete (C#)

How to handle processing real-time events that fire before processing of previous event is complete (C#)


By : user3934594
Date : March 29 2020, 07:55 AM
Any of those help Well, first the event in question is not being called asynchronously. So Unless you're setting the time on constantly changing threads, the call to set the time won't come back and you won't set it again until all of the events have handled it. If you want to prevent this problem, you need to move event handling to a different thread.
Ultimately the complexity of the situation and exactly how real-time you want to be can dictate the ultimate answer to this. But, assuming you want something that's fairly robust for a relatively few number of threads (let's say a dozen), here's roughly how I'd go about doing this.
code :
private var _Callbacks = new List<PropertyChangedEventHandler>();

public event PropertyChangedEventHandler PropertyChanged
{
    add
    {
        lock(_Callbacks)
            _Callbacks.Add(value);

        Thread Worker = new Thread(PollTime);
        Worker.Background = true;
        Worker.Start(value);
    }
    remove
    {
        lock(_Callbacks)
            _Callbacks.Remove(value);
    }
}

private void PollTime(object callback)
{
    PropertyChangedEventHandler c = (PropertyChangedEventHandler)callback;
    string LastReported = null;

    while(true)
    {
        lock(_Callbacks)
            if (!_Callbacks.Contains(c))
                return;

        if (LastReported != _currentTime)
        {
            LastReported = _currentTime;
            c(this, new PropertyChangedEventArgs(name));
        }
        else
            Thread.Sleep(10);
    }
}

public string currentTime
{
    get { return _currentTime; }
    set { _currentTime= value; } 
}
WF4 entity status handling, entities batch processing

WF4 entity status handling, entities batch processing


By : Pedro Dias
Date : March 29 2020, 07:55 AM
I hope this helps you . Good questions!
Taking your first and third questions, there are several possible approaches to this. All require that you write a custom WCF service to enumerate the required orders. This would probably not be a WF service; it might be a REST or OData service. How would you implement the service?
Batch processing and error handling in CSV upload in Rails

Batch processing and error handling in CSV upload in Rails


By : Eliyohu
Date : March 29 2020, 07:55 AM
To fix this issue I'll just focus on the translation of the CSV rows into an object. There's just to much repetition in the unless body. All those rows should be mentioned once, then handled in a loop instead of hard coding them like this. E.g.
code :
unless row[row_headers["name"]].nil?
    temp={}
    business_type = row[row_headers["business_type_id"]]
    business_type_id = business_type == "Online" ? 1: business_type == "Local" ? 2 : 3
    temp[:business_type_id] = business_type_id
    for name in [:user_id, :name, :country_id, :latitude, :longitude, :free_shipping, :category_ids, :style_ids, :shipping_country_ids]
        temp[name] = row[row_headers[name.to_s]]
    end
    for name in [:homepage, :telephone, :email, :address, :facebook, :twitter, :google, :instagram, :pinterest, :ship_details]
        temp[name] = row[row_headers[name.to_s]] ||= ""
    end
    business = target_model.new(temp)
    business.save
end
CSV.parse(csv_file, {headers: true, header_converters: :symbol}) do |row|
  business_type_id =  case row[:business_type_id]
                        when 'Online' then 1
                        when 'Local' then 2
                        else 3
                      end

  target_model.new( {business_type_id: business_type_id} + extract_required_fields(row) + extract_optionals_fiels(row) )
              .save()

end

def extract_required_fields(row)
  [:user_id, :name, :country_id, :free_shipping, :category_ids, :style_ids, :shipping_country_ids]
    .reduce({}) do |carry, item|
      carry[item] = row[item]
  end
end

def extract_optionals_fiels(row)
  [:homepage, :telephone, :email, :address, :facebook, :twitter, :google, :instagram, :pinterest, :ship_details]
    .reduce({}) do |carry, item|
      carry[item] = row[item] ||= ''
  end
end
Azure event hub, receive events only after processing previous events?

Azure event hub, receive events only after processing previous events?


By : Oguz Kilic
Date : March 29 2020, 07:55 AM
will be helpful for those in need The client.receive() method returns a RecieverHandler object that you could use to stop the stream using it's stop() method. You would then start it again using a fresh client.receive().
Another option would be to use client.recieveBatch() where the max batch size is set to 1.
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