• 1 Post
  • 91 Comments
Joined 1 year ago
Cake day: July 2nd, 2023
  • JakenVeina@lemm.eetoProgrammer Humor@programming.dev•C++ try not to add footguns challenge (impossible)English
    43·
    1 month ago

    It’s the capability of a program to “reflect” upon itself, I.E. to inspect and understand its own code.

    As an example, In C# you can write a class…

    public class MyClass
{
    public void MyMethod()
    {
        ...
    }
}

    …and you can create an instance of it, and use it, like this…

    var myClass = new MyClass();
myClass.MyMethod();

    Simple enough, nothing we haven’t all seen before.

    But you can do the same thing with reflection, as such…

    var type = System.Reflection.Assembly.GetExecutingAssembly()
    .GetType("MyClass");

var constructor = type.GetConstructor(Array.Empty<Type>());

var instance = constructor.Invoke(Array.Empty<Object>());

var method = type.GetMethod("MyMethod");

var delegate = method.CreateDelegate(typeof(Action), instance);

delegate.DynamicInvoke(Array.Empty<object>());

    Obnoxious and verbose and tossing basically all type safety out the window, but it does enable some pretty crazy interesting things. Like self-discovery and dynamic loading of plugins, or self-configuration of apps. Also often useful when messing with generics. I could dig up some practical use-cases, if you’re curious.

  • JakenVeina@lemm.eetoProgramming@programming.dev•What is your preferred API error response and why?English
    1·
    2 months ago

    #4 for me.

    Proper HTTP Status code for semantic identification. Duplicating that in the response body would be silly.

    User-friendly “message” value for the lazy, who just wanna toss that up to the user. Also, ideally, this would be what a dev looks at in logs for troubelshooting.

    Tightly-controlled unqiue identifier “code” for the error, allowing consumers to build their own contextual error handling or reporting on top of this system. Also, allows for more-detailed types of errors to be identified and given specific handling and recovery logic, beyond just the status code. Like, sure, there’s probably not gonna be multiple sub-types of 403 error, but there may be a bunch of different useful sub-types for a 400 on a form submission.

  • JakenVeina@lemm.eetoNo Stupid Questions@lemmy.world•Why don't computers have "computer-numbers" equivalent to phone numbers English
    1·
    6 months ago

    Main difference there being that switching cities means probably switching ISPs. You can absolutely carry over your IP address when you move between the same provider, if that’s part of your service plan, and that may well happen with some ISPs even without it being part of your plan. There just isn’t really much of a need for people to carry a static IP, except for some businesses, and I’d say the main reason is that people don’t visit websites by memorizing and typing in an IP. They do memorize and type in phone numbers.

  • JakenVeina@lemm.eetoProgramming@programming.dev•Genuine Question - have you migrated DBMS on a Production System which wouldn't have been possible with vendor lock-in on the backend?English
    2·
    7 months ago

    I think it’s a fallacy to say that you can or should build an application layer that’s completely DBMS agnostic. Even if you are very careful to only write SQL queries with features that are part of the official SQL standard, you’re still coupled to your particular DBMS’s internal implementations for query compilation, planning, optimization, etc. At enterprise scale, there’s still going to be plenty of queries that suddenly perform like crap, after a DBMS swap.

    In my mind, standardization for things like ODBC or Hibernate or Entity Framework or whatever else isn’t meant to abstract away the underlying DBMS, it’s meant to promote compatibility.

    Not to mention that you’re tying your own hands by locking yourself out of non-standard DBMS features, that you could be REALLY useful to you, if you have the right use-cases. JSON generation and indexing is the big one that comes to mind. Also, geospatial data tables.

    For context, my professional work for the past 6 years is an Oracle/.NET/Browser application, and we are HEAVILY invested in Oracle. Most notably, we do a LOT of ETL, and that all runs exclusively in the DBMS itself, in PL/SQL procedures orchestratedbbybthe Oracle job scheduler. Attempting to do this kind of data manipulation by round-tripping it into .NET code would make things significantly worse.

    So, my opinion could definitely be a result of what’s been normalized for me, in my day job. But I’ve also had a few other collaborative side projects where I think the “don’t try and abstract away the DBMS” advice holds true.