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If it can be run inside a browser, it can probably be run in an app. Because I am also working with RequireJS and Typescript it took some tweaking to get all these thing working together. First off is the HTML file. This is just a view to see our test results. Here is the code. From line 6 till the style sheets you can see my included of mocha.

Mocha supports different kind unit testing styles. I like the behavior driven development style. You will see this reflected in the way I write the unit tests. I could have also loaded these libs via require, but I did not see the point. The rest will get loaded via requirejs, because the app I am creating tests for also uses requirejs.

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To see howto handle this with angular and typescript, see my spanvious blog post here. Mocha will use these to report the results. You can see the paths configuration for require starting on line three. You can see a configuration for my first test and a test for something that is called secondScreenController. On line 20 you can see the Require call, the callback will get executed after the dom has loaded and angular.

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In it on line 22 I create an angular module. I do this, because the services I am going to test also register them selves in that angular module as part of their code. Without this module being there, I will get an error during testing. After this module has been created, you can see on line 24 another require call.

After they have all been in loaded in the dom I call mocha. This will instruct mocha to go and discover my tests, run them and report the results in the html file. This is a really simple typescript class. The only thing worth noting is that on line 1 I use the export keyword to define this class in RequireJS module. I do they so I can load this class in our unit test via require.

Now the interesting part. The unit test. This is where typescript shines. On line 4 you can see the import statement for my class under test. This is why in the test-main. The unit tests themselves load the class they are testing. Easy with typescript. On line 1 and 2 you can see the references to. Otherwise the typescript compiler will give you a lot of errors about the describe and should methods. These describe functions come from the fact that I set mocha up to use BDD earlier, you can also choose another style of unit testing.

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You can find the actual test code in the body of the it functions. You will need to do some extra stuff for null references. You will see that in another test. That test is shown below. On line 11 you can see some null handling. This seems a bit weird but it is actually the recommended way when using should. On line 23 you see another cool feature of mocha.

This is used in unit tests that have async calls. Without the done call mocha will treat the test as synchronous. If you do that call mocha will treat it as asynchronous and thus will wait with reporting until you actually flag the test done. To finish this post. This is what I get when I run my unit test Windows Store app! I hope someone who wants unit testing in their Windows Store html JavaScript app finds this post useful. Until next time!


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Welcome to my first blog post for Luminis! This time I am not going to blog about. Net related stuff, as I started working on a project which uses all the above technologies together. It took a little time to get my head around it all and I bumped into quite a few things when combining these cool frameworks, so I wanted to share my findings with you all.

Typescript is a cool new language that makes it a lot easier to write structured and object oriented JavaScript. If you come from a language like C or Java you will feel right at home. It has classes, interfaces, strongly typedness and a lot more cool stuff to write your applications. Another cool feature is that it compiles to just JavaScript!

So if you have been doing a lot of object oriented JavaScript, using the revealing module pattern or class patterns to write classes and modules you will be pleased to hear that typescript takes that pain away. Now take Angular, the cool MVC. Angular has modules, databinding, controllers, services, all the cool stuff we use in object oriented languages to separate our concerns.

And that is exactly my problem, you have a cool structured framework like Angular, with an unstructured, non-oo language like JavaScript. Almost no UI, just to understand what is going on. Typescript is completely open source and already has a lot of support. In the figure below you see my attempt to set up a simple hello world controller, you can see Visual Studio, which is great tooling, does not has a lot of intellisense to offer me, even though I reference angular with an intellisense comment.

This is due to the dynamic nature of JavaScript. In a minute I will show you the complete app, but this tooling trouble, is one of the problems Typescript aims to solve so stay with me. Now on to the complete example. Notice a couple things about this html. First of the multiple script references. This can become a hassle. The controller has to come after Angular. The order of the scripts matter, when I create a lot of files and dependencies this becomes hard to manage.

Will solve this later using RequireJs. Further more on line 8 I am using the as syntax to define a controller. Notice the whole anonymous function part? This is the JavaScript pattern to define a class. In JavaScript a class is basically just another function.

This is a lot of work for just a class! Look at this! Very nice. And this just compiles to plain JavaScript, so in the browser you will just reference the same. The controller still needs to get registered in Angular. As Typescript is a superset of JavaScript we can do the Angular registration below the class definition, or in a separate typescript file.

The only problem is that we will get compiler errors as the typescript compiler does not know about Angular or, other normal JavaScript libraries. To get Typescript to play nice with Angular and other JavaScript libraries you can make use of so called definition files. These are basically descriptions of a JavaScript library so that the Typescript compiler knows which functions there are, what they return and parameters they have.

You can create these, there is a big tutorial on these on typescriptlang. When you use Visual Studio you can right click on a JavaScript file and download the files from there. I created a screenshot of my Visual Studio just to let you see how cool this is. In the top of the file I reference the Angular definition file.

Now Typescript knows of the angular variable and gives me complete intellisense about types, function etc. You can see this function returns an ng. IModule instance, on which we also get complete intellisense. Here is the complete code. Keep in mind that this is just compile time.


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  8. Run time the scripts still need to be included in the right order to make sure the angular global exists before our controller registration. What is also cool, is that if define parameters in our constructor, they will get inject by angular. We could let inject Angular all kinds of registered services just like with normal controller functions!

    Here is the code for our alert service. Our service implements an interface, so we can easily switch it for a service which uses bootstrap for example. Also on line 14 you can see the angular registration. Yes Typescript has lambda expressions! The difference with a normal anonymous function is that the lambda keeps the this pointer of the parent function instead of a new scope. Now the service needs to get injected in our controller.

    The html will follow later. On line 5 you see a cool Typescript construction. For a constructor parameter that has a modifier Typescript will automatically emit a class variable. If the name of our parameter is the same as the name of the registered service Angular will just inject it. If not, when you use minimizing you have to use another inline annotation for it to work. You can also see the dependency on the services module when loading our appmodule. Keep in mind that this is not a file dependency. That is still up to us. Look in the html next, there we will need to include the scripts in the right order.

    You can see, starting on line 6, the script tags. They have to be in this order or the app will break. On top of that, the browser will load all these scripts, even if there are services included that the user does not need because he does not touch the functionality tat requires these services. Enter RequireJS.

    This is a library that adds modularization to JavaScript applications. Uhm wait, modularization? Yes it does! But Angular has logical modules. Angular does not modularize the file loading for example, or the handles the file dependencies as you can see in our index. Require can work neatly together with Angular modules, keep in mind that both libraries solve different problems. I am going to add Require to my application.

    The first thing that will change is my index. Two things that stand out are there is only one script tag left in our html. That is the reference to Require. As Require will manage all our script loading, this is the only thing we need in our main html page. The second thing is the data-main attribute on the script tag.

    This tells Require where it should start with executing. Very comparable to a main function in C for example. First in our main js file, I call require. We can use this function to give require some extra config stuff. Like short names for libraries. My call tells Require that whenever I want to use angular, it can be found by following the path I pass to it.

    On line 8 you see another cool thing. Require loads JavaScript files and sees them as modules. But those JavaScript files ideally should know that they contain Require modules. When defining an Require module a JavaScript file should tell Require what it is exporting and on what other modules it depends. We shall have a look at that later. The problem with angular is that this is an existing JavaScript library that does not contain Require modules.

    Angular just populates the global scope with an angular variable. By using a shim, we tell Require that when angular is done loading, it should clean up the global angular variable and instead pass it to the function on line This is because I made a little modification in our appController.

    Couple of cool things here. On line two you can see a typescript statement that is unknown to us. This is an undocumented feature of typescript. This statement allows us to specify the Require dependencies of our current module. On line 4 you can see the import statement. This makes sure I can use types from the module and the module itself in my code. On line 6 you can see an export keyword. This instructs the Typescript compiler to define a Require module that exports our controller.

    On line 16 you see that we need to import angular to make use of Angular. Just as with our alertService we want to make use of the angular module, so we add an import statement. This leads to compiler errors however. So we need to write a new definition file that tells typescript that angular is loaded as a Require module, and from that module exports the angular variable. Basically we need to make Typescript aware of our Require configuration in our main.

    Here is the. You can see the file getting referenced on line 1 or our controller and also in our alertService. Just as the shim configuration for require in the beginning of this post. The alertService is defined below. Nothing strange here. It is just like our controller. We use export to export the different types from this module. But there is still something strange happening. The problem here comes from the fact that Require loads and bootstraps angular before the DOM is ready. What we want, is a way to tell require load the modules as soon as the dom is ready. Fortunately there is a way to this.

    This is actually a RequireJS plugin called domReady. It is really cool. Just download the domReady. And make the domReady a module dependency of your main module. Here is the modified main. You can see that when you add domReady as a dependency, it will give you the current document as a parameter to your module function. So now we are done! Typescript makes working with require a lot easier, but you do have to know how Typescript accomplishes this, and how to make use of the. Yes, this is a somewhat long article. With no images, code samples, fancy screencasts or other visuals.

    It is just a story about me and my passion for OSGi. Perhaps there will be sequels, because there is still a lot to come.


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    However, these intentions always seem to vanish over time so I am not making any promises. In any case, I felt the urge to share my thus far little experience with real world OSGi. For a real customer with a real product on a small budget. Where software is developed by Average Joe or Jane and not by some cracker jack software guru flying around the world doing talks and publishing books. These people are of course working hard to make our life a better place while we just gloat over travelling abroad and back cover blurbs.

    In short: The customer has a product consisting of a central server with a number of embedded devices connected over the internet. The server is a plain Java application with a Jetty web interface to operate, configure and monitor the system. In the near future, we want to extend the capabilities of the system and will of course result in more network and other domain related complexities. When I started working at this project, a rudimentary rest interface for the server was already present and one of my jobs was to extend it to a full working version.

    Of course extensive testing was required, so I started by developing a simple tool to test a live rest service. It was sufficient to just let it fire a bunch of predefined http calls and log the results. I could extend it by automated validation and other should-haves later on. Eager to show off I started hacking away and the first requests were sent within the hour. Hardcoded urls launched from a static main method was the result but who cares?

    It was just a simple tool right? Next to a command line interface, repeatable tests or extensive logging could soon be needed. Such requirements were still uncertain and not that essential for the current state of the project. However, I did not want to rule them out by making it too hard to code in at a later stage. If you are not thinking OSGi already you are not paying attention.

    What is more is that OSGi would be extremely useful for a new software version on the embedded devices. So the more hands-on experience, the merrier. When it comes to OSGi, Bndtools is the only viable way to go, trust me. Unfortunately only available as Eclipse plugin yet, but the future is bright. Eclipse still has a grudge ever since I abandoned it for IntelliJ and I feel like I am still paying the price. But Bndtools is a loyal companion and creating bundles with correct dependencies, setting up run configurations, debugging and headless build support is a breeze. Marcel pointed to JPM and suggested to include the required bundles in the local workspace repository and just commit them in Git.

    For the Bndtools novice: You can set up local and remote repositories for external bundles. This allows you to easily setup package requirements for your own bundles. These files with clear methods definitions always make me smile. With a fluent API I was managing services like a skilled puppeteer. That is until you try to set up the run configuration and Bndtools is giving you a bit of a cryptic error when you hit the resolve button.

    Apparently I was missing some packages required by the dependency manager. Are these like meta dependencies? Anyhow, the video tutorials from Amdatu provided valuable help. It worked, but it was not ideal for a software engineer wanting to show off and just needed a quick fix.

    Whats wrong with the endless blogs with code samples and screenshots people used to write? I started this story with the need for a command line interface, but until now it was still missing. Luckily, the Gogo shell of Felix provided just what I need. Next to basic bundle lifetime management, Gogo allows a simple method to implement your own commands.

    It is just a matter of setting some properties and adding some annotations. These libraries all differ in documentation quality.

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    But then, how is that any different from plain Java libraries? I now have a simple test tool which I can easily extend with all kinds of result logging. I could add another UI or some automated way to launch the rest calls. All thanks to small and loosely coupled services. It kind of feels like ice skating on a lake: The joy of freedom and adrenaline you only understand when you feel the ice rushing under your skates. In this post I will show you how this is done.

    Skip to content. Javascript is actually, in many ways, very much different from C or Java and I believe that a basic, structured, overview of the most fundamental differences might help junior Javascript developers, like me, with the following things: -Some understanding of the inner workings of popular libraries we tend to use like Typescript, various module loaders, Angular, etc. Using object prototypes in Javascript to your advantage Each object in Javascript has a hidden reference to a prototype object, with Object.

    Closing words Javascript is an interesting language that has its weaknesses but certainly has a lot of strengths as well. Object i.

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    Focus on this section: In the way the code is set up currently, both of these lines will result in database queries and these queries are individually executed for each company in the database, because they are inside the companies. Point 3: Avoid querying multiple times when one query would suffice. Consider the following example: Note that the query will be repeated here for both foreach statements.

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