Tag Archives: Programowanie

[new ideas] using signalR to support long time consuming operations on server

In many situations i faced with problem when i have to make an operation which will be done on server side but this operation is very time consuming. For example reading structure for 100 parts from our ERP system. If i want to do it in one call from my web application then user starts process and for long time (e.g. 10 minutes) is not notified about what is really happening on server. In such situation user can start to think that something wrong happen and tries to make a call again for example.

Expected situation for me in that case would be to give user feedback that something is still going on server. Then user would know. Ok, it is time consuming process but still going well so i need to be patient.

Until today it was only a dream for me and i had no idea how to develop something like this.

But as you can find from this post i start to play a little with signalR. And today i made an experiment to see if signalR can help to solve this problem?

So i did an experiment and i know now that answer for this question is yes.

Here is how i did an experiment. You can implement your own solution as you want.

Setup on server side:

Web application with included signalR

Setup on client side:

Javascript application with jquery and knockout model in it.

Implementation:

On server i have hub named tester with following code:

Imports Microsoft.AspNet.SignalR 

Public Class tester
Inherits Hub

Public Sub hallo(id As String)
Clients.All.start("New client has loggin with guid: " + id)
End Sub

Public Sub test()
Clients.Caller.start("Starting at: " + Now.ToString)

For i = 0 To 30
Clients.Caller.step("Step: " + (i + 1).ToString + " " + Now.ToString)
System.Threading.Thread.Sleep(20000)
Next

Clients.Caller.koniec("Finish at: " + Now.ToString)
End Sub

End Class

My hub has two methods:

1. hallo – which get’s one attribute id – it is connection id and this methods send’s information for all connected clients that new user has been connected. it is only infomration method in our example.

2. test – this is right test method. At starts – sends information for client that process has been started, next makes fake long operation which is loop for 31 iteration. In loop it send’s information to client with step number of loop and freezes thread for 20 seconds. At the end sends information that process is finished. That means all process takes over 10 minutes. Which is enough long to make usual timeout.

Method test calls 3 different method on client side – start, step and finish

In client we have following application deffinition in Javascript.

function model() {
var m = this;
m.info = ko.observableArray();

m.startProcess = function () {
m.info.push(new info("Sending start call"));
myHub.server.test();
m.info.push(new info("Start call done"));
};
};

function info(i) {
var m = this;
m.Text = ko.observable(i);
}

var myHub;

$(function () {

myHub = $.connection.tester;
myHub.client.start = function (o) {
myModel.info.push(new info(o));
};
myHub.client.step = function (o) {
myModel.info.push(new info(o));
};
myHub.client.koniec = function (o) {
myModel.info.push(new info(o));
};

var myModel = new model();
ko.applyBindings(myModel);
$.connection.hub.start().done(function () { myHub.server.hallo($.connection.hub.id);});

});

First we have knockout model with observable array named info and one method which send call of tester on server.

Next we have knockout object of info which just presents data from server.

Finnaly we have start definition:

First step is definition of hub object tester from server. Next is definition of handling events send from server for start, finish and step methods. Next is definition of knockoout model and applying bindings to web page. Finally start of connection and after connection is succeeded  then calling method hallo on server.

on page we have button which calls method startProcess and unsorted list which presents contains of info array. When user clicks button starting process then process on server is starting and server notifies each 20 seconds loop that something i still going on server and finally sends finish information.

Here is how it looks in browser when process will finish:

signalr1

[livecoding] Simple menu on livecoding.io

Since few days i’m very impressed by livecoding.io page. I love this this page and i think it is very nice tool to make some prototyping for web.

To make a test i did small test today in i tried to build very small menu for web. This is my result

Zrzut_ekranu_19.05.2013_20_24If you want to see this example in reality please go to this page: http://livecoding.io/5608320 do you like it?

[apps] Public test of speedway app on Android / publiczne testy aplikacji żużla na androida

If you want to test my speedway application on Android here is good time for it. Just download this apk and install it on your phone. Have fun and leave a comment here if you have any ideas or comments.

Polish:

Jeżeli chcecie testować moją aplikację do żużla na Androidzie to teraz już możecie. Wystarczy ściągnąć ten plik apk i zainstalować go na swoim telefonie. Miłej zabawy i proszę o komentarze, jeżeli macie jakieś problemy lub sugestie.

Zrzut_ekranu_19.05.2013_11_13

Previous posts in this subject:

[apps] New speedway application for iOS and Android devices

Some time ago i created project for application to watch polish speedway games on mobile devices (link to this post). In meantime owners of website ZuzelEnd.com has contacted me and ask if i’m using their data unofficial way so maybe is to cooperate together and get official application. And hare it is. You can now see first screen shoots from new version of application:

Now we are doing internal tests of this application on Android and iPhone devices and if everything will be finished i will release it to everyone to download and use for free.

All information will be available on this page.

Polish: Jakiś czas temu przygotowywałem aplikację na androida i iphona do przeglądania transmisji z meczy żużlowych. Niedawno zgłosił się do mnie właściciel storny zuzelend.com, z której pobierałem dane z propozycją przygotowania oficjalnej wersji i oto ona, screeny możecie oglądać powyżej. Aplikacja jest w trakcie testów, gdy będzie gotowa udostępnię ją dla wszystkich.

Wszystkie informacje będziecie mogli przeczytać na tej stronie.

 

[SAP JSON proxy] First public information – BAPI calls and SE37 HTML equivalent

Today i finally prepared test environment for SAP JSON proxy and i’d like to present all of you some of ideas.

First – why this project?

Right now i’m working on few applications which works with SAP but all of them are .net apps and fat client.  Because i’m last time fascinated web and mobile programming again i was wondering how to easy build simple applications interacting with SAP. Usually it was quite easy – i was building web service which was exchanging data with my application. This was good idea and everything was working really nice and smooth, but problem was that first i have to do something on server and then in my app (web or mobile). Then i asked myself what if i will simply put universal application on web which will somehow understand some queries from my app and then will execute my calls on SAP and return data back.

I was wondering about exchanging data in xml but json seams to be better so i decided to use json.

How it works?

application is sending json object with definition of process which want to call on SAP, then proxy analyze this object and prepare RFC call for SAP. After call is executed and return is converted to json and send back to application.

What are benefit so this approach?

First of all – you don’t need to care about any special sap connectors for web and mobile devices. Second you don’t need to care about server side any more, you have to focus only on side of your application. Third it is secure because applications doesn’t have any direct access to SAP server so you can extend proxy by adding some security filters or limitations on calls

So now an example

Example works on bank accounts settings. On SAP we have BAPI_BANK_GETLIST bapi which looks this way:

sap1

it expect import parameter BANK_CTRY – which in our example will be PL and returns BANK_LIST table which in our example looks this way:

sap2

As you can see there is one row with one example bank.

my JSON query looks this way:

{ "bapiName" : "BAPI_BANK_GETLIST",
 "errorMessage" : "",
 "exportFields" : [ { "name" : "BANK_CTRY",
 "value" : "PL"
 },
 { "name" : "MAX_ROWS",
 "value" : "0"
 }
 ],
 "exportStructures" : [ ],
 "importFields" : [ ],
 "importStructures" : [ { "fields" : [ { "name" : "TYPE",
 "value" : " "
 },
 { "name" : "ID",
 "value" : " "
 },
 { "name" : "NUMBER",
 "value" : "000"
 },
 { "name" : "MESSAGE",
 "value" : " "
 },
 { "name" : "LOG_NO",
 "value" : " "
 },
 { "name" : "LOG_MSG_NO",
 "value" : "000000"
 },
 { "name" : "MESSAGE_V1",
 "value" : " "
 },
 { "name" : "MESSAGE_V2",
 "value" : " "
 },
 { "name" : "MESSAGE_V3",
 "value" : " "
 },
 { "name" : "MESSAGE_V4",
 "value" : " "
 },
 { "name" : "PARAMETER",
 "value" : " "
 },
 { "name" : "ROW",
 "value" : "0"
 },
 { "name" : "FIELD",
 "value" : " "
 },
 { "name" : "SYSTEM",
 "value" : " "
 }
 ],
 "name" : "RETURN"
 } ],
 "result" : "OK",
 "tables" : [ { "columns" : [ "BANK_CTRY",
 "BANK_KEY",
 "BANK_NAME",
 "CITY"
 ],
 "name" : "BANK_LIST",
 "rows" : [ ]
 } ]
}

and proxy response is this:

{ "bapiName" : "BAPI_BANK_GETLIST",
 "errorMessage" : "",
 "exportFields" : [ { "name" : "BANK_CTRY",
 "value" : "PL"
 },
 { "name" : "MAX_ROWS",
 "value" : "0"
 }
 ],
 "exportStructures" : [ ],
 "importFields" : [ ],
 "importStructures" : [ { "fields" : [ { "name" : "TYPE",
 "value" : ""
 },
 { "name" : "ID",
 "value" : ""
 },
 { "name" : "NUMBER",
 "value" : "000"
 },
 { "name" : "MESSAGE",
 "value" : ""
 },
 { "name" : "LOG_NO",
 "value" : ""
 },
 { "name" : "LOG_MSG_NO",
 "value" : "000000"
 },
 { "name" : "MESSAGE_V1",
 "value" : ""
 },
 { "name" : "MESSAGE_V2",
 "value" : ""
 },
 { "name" : "MESSAGE_V3",
 "value" : ""
 },
 { "name" : "MESSAGE_V4",
 "value" : ""
 },
 { "name" : "PARAMETER",
 "value" : ""
 },
 { "name" : "ROW",
 "value" : "0"
 },
 { "name" : "FIELD",
 "value" : ""
 },
 { "name" : "SYSTEM",
 "value" : ""
 }
 ],
 "name" : "RETURN"
 } ],
 "result" : "OK",
 "tables" : [ { "columns" : [ "BANK_CTRY",
 "BANK_KEY",
 "BANK_NAME",
 "CITY"
 ],
 "name" : "BANK_LIST",
 "rows" : [ { "values" : [ { "name" : "BANK_CTRY",
 "value" : "PL"
 },
 { "name" : "BANK_KEY",
 "value" : "TESTPL1"
 },
 { "name" : "BANK_NAME",
 "value" : "Test bank pl"
 },
 { "name" : "CITY",
 "value" : "test"
 }
 ] } ]
 } ]
}

And this is how it looks in my HTML tester page which works similar to SE37 transaction

sap4

 

And here is another example:

Details of this bank account:

sap3And my data

sap5

This is current stage, if you have any questions for this project, then please let me know in comments or send an email.

 

[Web apps] Voli.Faktury

If you have a small company in Poland and you need to create an invoice sometimes maybe you are looking for an simple and easy tool when you can do this from web.

I also have this problem, but because i’m a software developer, i don’t like to use existing software and i like to do something my own. Specially if there is good occasion to build something interesting and test some exiting technologies 😀

So i did invoicing software which is available here and here is a screen.

faktura

In this tool you can create your invoice, save it and use it later. You don’t need to create database of clients or products, because if you want to create an invoice for someone who you already did just copy this invoice and paste it in new one. Idea is to have as less functionality as possible and make it to use as easy as it is.

Because it is still in beta stage, if you will register and want to use it, then let me know this because i need to know if i should care about your data.

Ok, some technical information. Here is done some of my favorite (for now;)) software technic and i did something what i personally call “onion programming”. We have following liers:

1. Data – data are stored in NoSQL Document database called Ndatabase. It is easy and great solution for embeded concept – just one library try it!!!

2. data access lier is ASP.NET MVC 4 application

3. data exchange lier it is JSON communication

4. data presentation lier is HTML with Bootstrap and jQuery

5. data binding is MVVM model supported by Knockout-js – great option if you have an experience with WPF or silverlight. Using Knockout and jQuery programming web applications is so easy as building fat client applications in WPF or WindowsForms.

If you have any technical questions or suggestions to this project, please let me know and i will try to answer you.

 

[iOS app] MaxVideo.pl client application

Since some time in App store you can find and test my client application for MaxVideo.pl service.

This service is video storage service where users can store their own movies and can share this movies to friends by sending direct link to it. Web site policy is to do not have any search feature because all files are private users files and only users can decide who can or who can not watch their movies.

I wanted their movies for my different and private project so we made a “deal” they will give me access to their api and i will make an application for them.

So now if you have our own movies on MaxVideo or you have friends who store movies there you can watch it directly on your iphone or ipad. Only what you need to have is valid account.

Application is available for free in App Store – have fun and leave comment if you want 🙂

In this project i used may favorite technology (for now) for programming mobile devices – it is combination of PhoneGap, jquery and jquerymobile.

20130213-213631.jpg

If you have an android device and you want to use this application on android you can try this apk. I don’t use android any more so i don’t know if everything is working ok, but this is compiled PhoneGap project for android with my app, so feel free to test it and let me know if it works or not.

 

[New ideas] second approach to shopping presentation software

Second version of my idea about shop presentation software. This time it is small parser of web shop of polish H&M, Just go there and hit F4 and put H&M product number, Or – this is coolest – scan QR code with your mobile phone and you can select one of few example codes to display. Have fun 🙂
Only one note – remember it is still prototype and only a presentation of idea.

Here is link to find and test this software

Zrzut_ekranu_08.02.2013_20_10when you will open mobile application just select one of example article numbers and information of it will be shown for 10 seconds on monitor screen remotely

Here is how mobile page looks like.

20130209-213934.jpg
When you will select category from main menu then you will see products from this category.

20130209-213945.jpg
Now you need to select product which you want to see on big screen.

Of course your “big screen” can be whatever from 80 inches TV set to iPad.

[Pomysły] taki sobie mały pomysł po wizycie w sklepie

Byłem z moją żoną w sklepie dwa dni temu i tam spotkałem kilka plakatów, które miały zachęcać do kupna produktów. A co gdyby te plakaty zastąpiono je tym: http://goluda.pl/apps/keydown/ naciśnijcie 1+enter lub 2+enter lub 3+enter i zobaczcie co się stanie 😀

A teraz wyobraźcie sobie, że nie naciskacie klawiatury ale skanujecie metkę od ubrania!!!!

Plan lekcji na iPhone już trafił do App store

Od jakiegoś czasu pracowałem nad odświeżoną wersją mojego programu do planu lekcji i dzisiaj w końcu trafił on do App Store.

Mamy nowy design in nową funkcjonalność, więc tutaj krótka lista co teraz program potrafi:

  • Obsługuje dowolną liczbę uczniów (dzieci)
  • każdy z uczniów może mieć zdefiniowany dowolny plan godzin lekcyjnych (kiedy lekcje się kończą lub zaczynają)
  • przy tworzeniu planu lekcji na konkretny dzień można rozpocząć od wstawienia standardowego planu godzin i wtedy tylko wypełnić już kolejne lekcje, a niepotrzebne godziny usunąć
Teraz kilka screenów z aplikacji:
Czekam na wasze opinie, komentarze i pomysły co by tu jeszcze zmienić.