Angel \”Java\” Lopez on Blog

February 21, 2014

Owin: Links And Resources (2)

Filed under: .NET, C Sharp, Links, Owin — ajlopez @ 7:24 pm

Previous Post

Byte Rot: OWIN and Katana challenges: blues of a library developer

damianh (Damian Hickey)

owin Archives – StrathWeb

Getting Started With OWIN and the Katana Stack – Tugberk Ugurlu’s Blog

Owin.Dependencies: An IoC Container Adapter Into OWIN Pipeline – Tugberk Ugurlu’s Blog–an-ioc-container-adapter-into-owin-pipeline

Introducing SaasKit – Multi-tenancy made easy – Ben Foster

Are we gOWINg in the right direction? | Roysvork

The Liara Framework by Prasanna V. Loganathar



OWIN Middleware in the IIS Integrated Pipeline : The Official Microsoft ASP.NET Site

OWIN and Katana : The Official Microsoft ASP.NET Site

Fix and OWIN and Simple.Web – codeface


ASP.NET MVC 5 Fundamentals – Online Training Course for Developers

Writing OWIN middleware

ASP.NET – Getting Started with the Katana Project

Understanding OWIN Forms authentication in MVC 5 – .NET Web Development and Tools Blog – Site Home – MSDN Blogs

My Links

Keep tuned!

Angel “Java” Lopez

February 20, 2014

Owin: Links and Resources (1)

Filed under: .NET, C Sharp, Links, Owin — ajlopez @ 7:37 pm

Next Post

OWIN — Open Web Interface for .NET

Getting up to speed with Katana – Jon Galloway

Tomek on Software: Access MS SQL from a node.js application using OWIN, in-process CLR hosting, .NET, and ADO.NET

Tomek on Software: CPU bound workers for node.js applications using in-process .NET and OWIN

tjanczuk/owin · GitHub

Tomek on Software: Hosting .NET code in node.js applications using OWIN

gsscoder/owinhttplistener · GitHub

Herding Code 123: Andreas Håkansson and Steven Robbins on NancyFx

Kayak, a C# HTTP server.

OWIN — Open Web Server Interface for .NET, v1.0 Draft 5

Hanselminutes Podcast 264 – This is not your father’s WCF – All about the WebAPI with Glenn Block – Scott Hanselman

Getting fancy with Nancy – Introduction – TheCodeJunkie

CodePaste.NET – Processor for supporting uri extensions which map to variant representations

My Links

February 19, 2014

End Of Iteration 2014w07

Filed under: .NET, C Sharp, Iteration, JavaScript, NodeJs, Open Source Projects, Scala, ScalaSharp — ajlopez @ 7:15 pm

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A lot of interesting topics and code.


I started to explore Meteor:

You can see one of my samples deployed at:

A simple CRUD (WIP) application. Next steps: code generation using AjGenesis for Node.js, mobile look, and wrap up as a PhoneGap application.

I also wrote posts:

Programming Meteor (1) First Steps
Meteor: Links And Resources (1)


My Scala interpreter in C#:

I started to switch from a tree of expression to a tree of nodes (a classical AST). In this way, I could implement type checking, compilation, etc… visiting the node tree. There are differences between an expression and a node. A node could be a name, but that name, in Scala, could be a val, a var, or a def. I have not the full context to decide what kind of expression to invoke. So, I need a previous step. A node is the first parser output. A tree node could be visited, performing type checking and then producing the correct expression.


Inspired by Meteor .autorun method, I wrote a react library in JavaScript

As usual, simple code, using TDD workflow.


I continue adding features to

A simple JavaScript library to process an HTML string. I should add more features, and write a sample, scraping an e-commerce site.


A minor addition in ClojSharp using recur in a function

Completing the model in supporting that an entity references another entity.

I worked on two non-public projects, too. More fun is coming.

Keep tuned!

Angel “Java” Lopez

February 12, 2014

End Of Iteration 2014w06

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More deliberate TDD practice in my open source projects


My Erlang-like interpreter in C#:

I added selective receive to process mailboxes. It was an interesting implementation, where each mailboxes has a save queue to keep the rejected messages. Once a message is accepted, the save queue is put again as a message queue, ready to be consumed again.


My Scala interpreter in C#:

I added binary expressions. I started to think about type check implementation. This next week I will add an explicit AST (Abstract Syntax Tree) to be used for type checking. Not all Scala expression can be type checked at parser time, because possible not-resolved cross references.


My Scala interpreter in JavaScript:

Minor additions: parse class with body, parse a suite of statement (a list of statement). One thing to review in this project and the previous one: Scala new line in lexer/parser. The language has special rules to skip or not a new line, depending on the context. I should add type checkting to this JavaScript project.


My Clojure interpreter in C#:

I applied a surgical refactor: internal reimplementation of top level context to save internally clojure vars. In this way, the top level definitions are saved not as name/value but as named var/value. The rest of the context are simple name/value dictionaries (like the context created by the special form let).


I created a new JavaScript/Node.js package:

a simple web scraper in JavaScript/Node.js. The initial commits only process HTML in text, iterating over tag items. Light weight, no dependencies needed yet.


I added minor changes to:

I worked on three non-public projects, too.

More fun is coming.

Keep tuned!

Angel “Java” Lopez

January 15, 2014

End Of Iteration 2014w02

Filed under: .NET, Akka, C Sharp, Iteration, JavaScript, Lambda Calculus, NodeJs — ajlopez @ 6:58 pm

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A lot of work at the second iteration of the year:

More Code Generation with AjGenesis

I created

with a simple Sinatra site generated using AjGenesis for Node. I should add the entity support (list, persistence, view, edit, new) but it was created in two hours. Nice experience adapting templates


An Akka-like actor model implemented in C#. It was born on Sunday:

I’m using TDD, as usual. My ideas are implemented using baby steps, make it works, make it right, and in the future, make it fast. I’m not concerned with performance yet, but to have all the pieces in place for local run. Then, I will add distributed processing. One of the key things is the message mailbox management. By now, I have only one by actor system, implemented using a concurrent queue. I planned to add a queue by actor, if specified at creation of the actor.

Scala in JavaScript

The project

An interpreter, not a “transpiler” to JavaScript. I want to do dog fooding of my SimpleGrammar project, and learn a bit about Scala language.

Lambda Calculus

Implemented in JavaScript, a Saturday code kata:

Next steps: add named functions.


More work in my Dylan-like language implemented as an interpreter over C#:


I added minor functionality to ClojSharp (Clojure-like in C#) I worked on two non-public projects.

More fun is coming

Keep tuned!

Angel “Java” Lopez

September 23, 2013

End Of Iteration 2013w38

Filed under: .NET, C Sharp, JavaScript, NodeJs, Open Source Projects, PHP — ajlopez @ 10:34 am

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I started to prepare new talks, for October, November (PHP, ASP.NET MVC, Python, Smalltalk, Ruby).


I have a new project:

with simple PHP pages, and one server with interaction with Node:


I have a simple compiler for PHP to JavaScript

A running page using Node.js


The parser for PageJs is based on SimpleGrammar

I published version 0.0.2, with some internal refactoring. It was very easy to extend PageJs parser with new expressions and commands. Good dog fooding!


SimpleProlog: parse queries and rules.
AjTalkJs: better compilation of variables.
RubySharp: new class diagram to be used in a post.
SharpMongo: count() in collections
SimpleLisp: refactor tests to use simpleunit
SharpStorm: adding IBolt

I worked on two non-public projects, too.

Keep tuned!

Angel “Java” Lopez

August 18, 2013

TDD Kata (7): Manage your Energy

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This is a problem that I found in my Google Code Jam. This time, it is a problem where we should put a lot of neuron work in the resolution of algorithm. Apparently, there is no obvious solution. The problem is:

You can check my solution at:

And my commit history at:

I was with few left time, so I only wrote some tests, and run the Google initial example. But I could not solve the “small set”. Some days ago, I tried again, but the result I got is not the correct, according Google.

So, some day I could take the problem again. It should be tricky how to decide the energy to put on each activity, knowing the future.

Let’s got, try to solve it!

Keep tuned!

Angel “Java” Lopez

August 4, 2013

New Month’s Resolutions: August 2013

Time to review my July’s resolutions:

- Update Memolap [complete] see repo
- Update GrammGen [complete] see repo
- Update SimpleGrammar [complete] see repo
- Prepare a talk: Intro to Smalltalk [complete] see talk
- Start PHP compiler to JavaScript [complete] see repo
- Write PHP example with Node.js [pending]
- Update AjLispJs [[pending]
- Create a web site sample using AjLisp and Node.js [pending]

Instead of updating AjLispJs, I started another project:

- Start SimpleLisp, Lisp compiler to JavaScript [complete] see repo

Additionally, I worked on:

- Start SimpleContext, associate arbitrary data to simple JavaScript objects [complete] see repo
- Start SimpleProlog, Prolog language interpreter in JavaScript/Node.js [complete] see repo
- First version of KodeTokenizer [complete] see repo
- First version of KodeMutator [complete] see repo
- Publish Obops on Nuget [complete] see repo
- Publish my first Smalltalk samples [complete] see repo
- Create and pubish first version of Plagre, programming language recognizer [complete] see repo see demo
- Updated my TDD Rocks samples [complete] see repo
- Start SharpBase C# in-memory database [complete] see repo
- Start AjForce, applications in Node.js a la [complete] see repo
- Start OStore, in-memory JavaScript object store [complete] see repo
- Added Rack samples to my Learning Ruby [complete] see repo
- Write SimpleMule, simple Mule-like in JavaScript/Node.js [complete] see repo

Also, I published Google hangouts:

- TDD Rocks (1) Playing with Ruby
- TDD Rocks! (2) OStore with JavaScript/Node.js
- Exploring Smalltalk (1) (Spanish)
- TDD Rocks! (3) SharpBase in C#
- TDD Rocks! (4) SharpBase in C#

My new month’s resolutions, August 2013:

- Update SimpleProlog
- Update Mass
- Update AjTalkJs
- Update AjTalk
- Update SimpleLisp
- SimpleLisp web server sample
- New Google Hangout using Ruby and TDD
- New Google Hangout using C# and TDD

Lot of fun is coming ;-)

Keep tuned!

Angel “Java” Lopez

July 29, 2013

End Of Iteration 2013w30

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A summary of the past week:

Smalltalk Intro

A work in progress presentation at:


First version, it can mutate a source code file, and then run any command (usually the tests)

All written using TDD


Object operations (add, subtract, etc..) a la Visual Basic.NET. I published it at Nuget:

Smalltalk Samples

My first published code, as fileouts and as a FileTree repository:

I also published on see!/~ajlopez. For using Git/GitHub and FileTree, see:


A Prolog interpreter in JavaScript/Node.js. I have atom, variable, facts, base, partial unification. I should work on rules, parser (Edinburg syntax) and full unification algorithm:

Again, all written using TDD.

TDD Rocks!

I published a new video:

TDD Rocks! SharpBase in C#

showing my TDD workflow building a simple in-memory database.

Private Projects

I worked on two private projects: one having an in-memory OLAP cube, and the other was a simple but powerful use case implementation, involving a Single Page Application (all model at browser).

More fun is coming!

Angel “Java” Lopez

July 14, 2013

TDD Kata (6): Bulleyes

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At Google Code Jam, Round 1A, I found this problem:

The bull eyes problem: Mary should paint a series of concentric circle, given a radius and an initial amount of paint. The problem is: given r and t (the radius and the amount of paint) how many circles of width 1cm Mary can pain?

I wrote my solution using TDD, but after a first thoughts, I coded a solution using a formula, see:

The commit history at:

At the beginning, I had an algorithm that depended on a function that calculates the amount of paint needed to paint a circle of radius r. But then, I replaced it by other algorithm, that directly returns the count of circles that Mary can pain, given an initial radius and paint quantity. All my tests continued to be in green.

As in other Google Code Jam problems, I didn’t write the console program using TDD. I put my focus on the right algorithm. In this case, it was enough to have a general formula that solves the problem.

Keep tuned!

Angel “Java” Lopez

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