The 2nd Monitor

Duga

12:00 PM

[Zomis/CodeReview-Shield] Zomis created repository

skiwi

@Duga Is it going to protect us?

Duga

@dewe [CodeReview](codereview.stackexchange.com) might be better suited for this, they offer critique and suggestions to improve code that's already working. I might be misunderstanding your question though, so please read their site tour before asking there. — SuperBiasedMan just now

RubberDuck

Anyone around to talk dependency injection?

nhgrif

Does someone want some Objective-C upvotes on Code Review?

9

Q: BiDirectional Dictionary (and its Mutable friend can come too)

I've attempted to implement a 1-to-1 dictionary in Objective-C. I'm probably missing some convenient methods that one might commonly want to use. These are both declared in the same .h file and implemented in the same .m file. I think if much more code is added to either of these, splitting th...

This pre-Swift 1.2 question's code has room to add Objective-C-Nullability annotations:

9

A: How to create class methods that conform to a protocol shared between Swift and Objective-C?

In Objective-C, we were always passing around pointers, and pointers could always be nil. Lots of Objective-C programmers made use of the fact that sending a message to nil did nothing and returned 0/nil/NO. Swift handles nil entirely differently. Objects either exist (never nil), or it is unk...

RubberDuck

More specifically, how to deal with tons of dependencies bubbling up through the classes?

And the massive constructors that ensue....

nhgrif

12:06 PM

Example?

( a simple one... I'm not that familiar with this concept of "dependency injection" and I've never had massive constructors...)

RubberDuck

Okay, so I have this plugin architecture.

Where there's a single point of entry into a class that is responsible for doing a little bit of work, but mostly, just delegates to other presenters that know about how each piece of the system works.

Which was great. It kept all of the business logic nice and neatly separated.

But now I've ended up with this terribly monster ctor. One sec will paste it in.

skiwi

@RubberDuck You want to inject some stuff?

What about autowiring things? The Spring MVC in Java has an @Autowired annotation that removes the need for injecting it in the constructor

RubberDuck

public SourceControlPresenter(
    VBE vbe,
    AddIn addin,
    IConfigurationService<SourceControlConfiguration> configService,
    IChangesView changesView,
    IUnsyncedCommitsView unsyncedCommitsView,
    ISettingsView settingsView,
    IBranchesView branchesView,
    ICreateBranchView createBranchView,
    IDeleteBranchView deleteBranchView,
    IMergeView mergeView,
    ISourceControlView view,
    IChangesPresenter changesPresenter,
    IBranchesPresenter branchesPresenter,
    ISettingsPresenter settingsPresenter,

@skiwi go on. How does that work? I'm sure there's something similar in the C# world.

skiwi

@RubberDuck Let me dig up an example

RubberDuck

ok

skiwi

12:11 PM

@RubberDuck Holy mother of cows!

RubberDuck

Yeah... I know

It all bubbled up to the top and now I don't know what to do with it.

skiwi

@RubberDuck What about don't touch it?

nhgrif

Well

skiwi

How many of those classes exist in your application?

Should there always be only one, or can there actually be multiple?

RubberDuck

@skiwi certainly an option. It is the entry point.

Entry point. There's only one of each and they get created just outside of this class and injected in.

skiwi

12:13 PM

That's your candidate for an Autowiring/Beans architecture

So... I have this

@Controller
@MessageMapping("/api/user")
class UserController {
    UserService userService

    @ControllerMethod
    @MessageMapping("/create_user")
    def createUser(CreateUserMessage createUserMessage) {
        try {
            userService.createUser(*createUserMessage.values())
            def builder = new JsonBuilder()
            builder {
                success true
            }
        } catch (CreateUserException ex) {
            def builder = new JsonBuilder()
            builder {

Here the UserService userService is autowired via Grails/Groovy (but it uses Spring MVC in the backend)

I have an UserService class and Grails automatically creates an instance of that on startup and saves it as a Spring Bean

A Spring Bean is a class/instance you can always inject in your application

RubberDuck

so.... where the heck does userService actually come from?

skiwi

@RubberDuck Nobody knows...

But I can define my own class if I want to do so

I could have defined it in my resources.groovy file as:

beans = {
    userService(UserService)
}

(UserService in Groovy is UserService.class in Java)

But Grails is configured to automatically beanify everything in the controller directory (and a few more)

Duga

No , no ! I would like you to tell me if this is a good way of doing it ! Actually, here is the source code on codereview : codereview.stackexchange.com/questions/95275/… — MattMatt 42 secs ago

Captain Obvious

0

Q: Unit testing a homework assignment

I wrote NUnit tests for class CharGrid from this homework assignment. I am a beginner with C# and NUnit. My goal here is DRY: I want to keep the testing code as short and simple as possible. In addition, want to run every test independently, as opposed to having a single method with a lot of as...

beginner unit-testing homework nunit

skiwi

Oops... found this gem

> My role in this project was also to resolve conflicts if they would happen because using this system alone does not guarantee that everyone will go as it should, someone should be taking care of that.

Yes... I wrote that

RobH

12:21 PM

@RubberDuck - you could create some parameter objects. E.g. group all of your views together into an ISourceControlViews object with a CreateBranchView property, a DeleteBranchView property etc. Then simplify your constructor to take the aggregate instead

skiwi

@RubberDuck What kind of C# framework are you using right now?

RubberDuck

@RobH that's not a bad idea. Could simplify things a bit. I had considered it before, but it felt like moving the problem.

Maybe it's not. Could be a useful abstraction I suppose.

@skiwi Plain old class objects.

@RobH welcome to the 2nd monitor btw! You write great answers. It's nice to "meet in person".

skiwi

@RubberDuck Uh... no framework?

RobH

:) thanks. I ocassionally lurk here without actually saying anything. The joys of being at work

skiwi

I need to find some inspiring figure about Version Control for this write-up...

I hate mandatory figures

RubberDuck

12:26 PM

@skiwi Nope. Pure DI up till now. Just installed Ninject to see if it will help, but I can't see how it really will. Maybe if I do what RobH said too...

skiwi

@RubberDuck But I mean for the MVC part? Or how is the application structured?

RubberDuck

Oh... Winforms.

So, it's MVP flavored MVC. No framework.

RobH

@RubberDuck - If you use StructureMap you can use a convention to scan all your asssemblies and autowire single implementations of interfaces

RubberDuck

Thanks. Will look into it.

skiwi

@RubberDuck Ok...

Captain Obvious

12:29 PM

0

Q: Fade and eye detection algorithms for opencv

i'm working on face and eye detection (no recognition needed) using opencv , and i've found some algorithms that i can use : Viola–Jones object detection framework : This algorithm is implemented in OpenCV as cvHaarDetectObjects(). https://en.wikipedia.org/wiki/Viola%E2%80%93Jones_object_detect...

opencv

skiwi

(btw. What's this Nth Monitor?)

rolfl

@skiwi QPaysTaxes and Ethan were prattling on like a couple of seagulls squabbling over some french fries. It was annoying and inconsiderate, so they were moved over to there.

4

skiwi

@rolfl Some specific event or you mean what they're doing for a week already?

Ugh, how do I explain version control to 16 year olds of general public?

rolfl

They crossed the line a while ago, but this part is where I figured I could step in and explain it without "grey areas":

in The Nth Monitor, 8 hours ago, by QPaysTaxes

Thanks, but I already have a girlfriend...

nhgrif

What's "SNR"?

skiwi

12:40 PM

@nhgrif Signal to Noise Ratio

rolfl

Signal to Noise Ratio

Mast

That ^^

skiwi

@rolfl I also had that feeling, but it's difficult to address it

rolfl

They were like two peope talking loudly to each other on cell phones on the same bus.... that's about as close as I can get to an analogy .... and, they now have their own bus

nhgrif

And they're the only ones on that bus. And they're still talking to each other loudly on their phones?

skiwi

12:44 PM

They are calling eachother on their phones, or talking to someone else?

rolfl

each other

skiwi

Okay... that's yeah, well, no words for that

Mast

Reminds me of a certain group of regulars in the local supermarket, yelling like there's 200m between them while they're standing next to each other.

rolfl

and everyone else on the bus is irritated, but too polite to tell them to shut up .... and they say: well, "noone else is talking, so we may as well".

but their conversation is not about general-interst things, or specific bus needs

@skiwi Version control is the string you use when you walk in to a maze and need to find your way out again

2

Mast

Perhaps I'm too curious, when when is something considered 'not general-interest'? I could think of a couple of examples, but I suppose there's a line somewhere.

rolfl

12:48 PM

it tells you where you have been, what you have done before, and, if you are a group of people, it allows you to explore different paths as individuals, and merge them back together.

@Mast That's the hard part.... there is a line somewhere.... but, if the conversation is only of interest to the two people talking, then it is no longer "general discussion"

If the conversation could be held in a different room, and no-one in this room would miss it, then it does not beong here.

2

Mast

Of-course, but does that mean as long as at least 3 people are interested in the conversation it's still valid? It can't be that simple.

rolfl

No, it's not that simple.

that's the problem.

And, it goes in swings and round-abouts.

spyr03

"I was shopping today, there is a sale on in blah" vs "I was shopping today, I got a tshirt"?

Would that be an example?

Mat's Mug

@Mast if it makes a circle where it's happening because nobody's talking and then nobody's talking because it's happening, the line was crossed.

rolfl

so, it has swung too far in to the banalities of the lives and transgressions of people, and it is time to clamp down, and maybe go too far in the other direction.... to define the limits.

nhgrif

12:52 PM

@Mast That's the problem. When there was only one teenager in the room, there was never 3 or more people interested in talking about teenager things. Now there are 3 or more teenager regulars.

There are far more non-teenager regulars that don't want to hear about teenager non-sense and silliness.

rolfl

I think labeling it as "teenager" issues is an injustice.

nhgrif

Maybe.

rolfl

Even if it was a tutorial between two or a few people, they would get a new room

nhgrif

Depends on how in-depth and on-going it was.

rolfl

Yes, which is why this issue is complicated

nhgrif

12:55 PM

But the distinction I'm trying to make is that if two people are going on-and-on about something programming related, I could skim the conversation or pay half attention, and I might accidentally learn something.

rolfl

there's a big grey area, but, it was pretty black/white with QPaysTaxes and Ethan at the point I stepped in.

@nhgrif Yes, or you could see they were in a different room, and then go in to there and listen.

Mast

Hard part there would be defining when it's a short occurrence and when it's a 'going on and on'

nhgrif

Right, but if they were talking about programming stuff and nothing else was going on, I wouldn't be that bothered. I'd count almost any programming conversation as "signal" and not "noise"

rolfl

Not if they are just chatting to fill the space.

Mast

There was a conversation earlier today about electrics and LAN parties of which I later realized it may have been an edge case.

skiwi

12:57 PM

@rolfl So everything related to code is per definition of interest, even if only two people are talking, kind of?

nhgrif

Hmm... then rolfl, you're going to explain with much more depth what you mean exactly then...

skiwi

For the record, I think it was a good decision

nhgrif

Are you saying that you and I couldn't have an hour long conversation about iOS development in this chat room (assuming it wasn't interfering with anyone else... no one else was chatting, etc.)? I've never seen anyone have a problem with cross-conversation chat or interrupting an on-going conversation. As a general rule, if you and I were bothered by the interruptions, we'd go to another room to continue our conversation uninterrupted.

But if there were no interruptions and we were discussing something unquestionably on-topic for the site... is it really a problem for two people to go back & forth for so long?

I agree on moving those two out, yes, but I'm completely confused by what you're saying...

rolfl

6 hours ago, by QPaysTaxes

...Man, people like copy/pasting from Wikipedia without attribution

Spouting out on irrelelvant crap just to create conversation

The Nth Monitor

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