From our way of thinking, we want to be tightly coupled to the data contract, but having expendable end points for older data contract versions.

Message in Json format

       i.   Date Created

       ii.  Source ID

       iii. Data Object Type Name

       iv.  Data Object Type Version

       v.   Package data

           a. Any Json data but schema valid the the type version

So basically:

1)      "A" creates data object which is serialised to a json message (wrapper and data).

2)      Json messge is added to a queue.

3)      B Serialiser dequeues messages that it has an understanding about the type and version number.

4)      B Rehydrates and schema verifies data object from message package data.

Available - you can run B version 7 next to B version 6 until there are no more messages for version 6 in the queue.

Scalability - as you can spin up new B's in different versions to process messages.

Performance - as B only tries to dequeue, deserialse and validate packages that are for them.

Timeliness – You can check many queues and even specialize queues for data types if you want.

Data – basic json strings.

Other advantages are:

Monitoring – you can peek at the queue to see the progress of an upgrade.

Deployment – you can monitor the queue to see which A's which have not been upgraded.

etc.

posted by N2Cheval

posted by N2Cheval

exoteric wrote

Did Anders do a destructive update of Erik? 

Are you suggesting Erik needs some "Datomic" in his life? Where the latest version forgot his previous understandings...?

posted by N2Cheval

posted by N2Cheval

posted by N2Cheval

Any way, keep on with the documentation, but examples of solved problems is just sometimes better for us dark matter developers.

posted by N2Cheval

posted by N2Cheval

posted by N2Cheval

posted by N2Cheval

The next step in smart phone has to be tactile feed back, especially when USB key insertion. A simple electro-magnet that when in use, clips the key in place, and releases when not in use. ie. only when powered and in use the clips pop in.

posted by N2Cheval

Query Code:

return from n in quotes.Where(p => p.Symbol == "MSFT")
  select new { date = n.Date, close = n.Close.ToString() };

GetQuotes Code:

var timer = Observable.Interval(TimeSpan.FromSeconds(5), scheduler).ObserveOn(this);
return quotes.ToObservable().Zip(timer, (quoteList, timerList) => quoteList);

posted by N2Cheval

var lookup = textChanged
                            .Select(_ => txt.Text)
                            .DistinctUntilChanged()
                            .Throttle(TimeSpan.FromMilliseconds(200))
                            .Do(text => Console.WriteLine("TextChanged: {0}", text))
                            .Where(text => text.Length >= 3)
                            .Do(text => Console.WriteLine("Lookup: {0}", text));

var results = lookup
                          .Select(text => getSuggestions(text))
                          .Switch();

posted by N2Cheval

var textChanged = Observable.FromEventPattern(txt, "TextChanged");

var getSuggestions = Observable.FromAsyncPattern<string, DictionaryWord[]>(BeginMatch, EndMatch);

posted by N2Cheval

class Events {
        public event Action<string> TextChanged;

        public virtual void OnTextChanged(string text) {
            var t = TextChanged;
            if (t != null)
                t(text);
        }

        private event Action<string> lc; //lengthChanged
        public event Action<int> LengthChanged {
            add {
                lc += x => { Console.WriteLine(x == null ? 0 : x.Length); };
                TextChanged += lc;
            }
            remove {
                TextChanged -= lc;
            }
        }
    }

class Observables {
        ISubject<string> textChanged = new Subject<string>();

        public virtual void OnTextChanged(string text) {
            textChanged.OnNext(text);
        }

        public IObservable<string> TextChanged { get { return textChanged; } }

        public IObservable<int> LengthChanged {
            get {
                return textChanged.Select(s => s == null ? 0 : s.Length);
            }
        }
    }

posted by N2Cheval

posted by N2Cheval

http://channel9.msdn.com/Forums/Feedback/mediach9ms-VS-filesch9ms

posted by N2Cheval

posted by N2Cheval

posted by N2Cheval

posted by N2Cheval

posted by N2Cheval

posted by N2Cheval

posted by N2Cheval