A monolithic kernel is a kernel where all services (file system, VFS, device drivers, etc) as well as core functionality (scheduling, memory allocation, etc.) are a tight knit group sharing the same space. This directly opposes a microkernel. A microkernel prefers an approach where core functionality is isolated from system services and device drivers (which … Read more
The steps that I use for initial design (getting to a class diagram), are: Requirements gathering. Talk to the client and factor out the use cases to define what functionality the software should have. Compose a narrative of the individual use cases. Go through the narrative and highlight nouns (person, place, thing), as candidate classes … Read more
Logical layers are merely a way of organizing your code. Typical layers include Presentation, Business and Data – the same as the traditional 3-tier model. But when we’re talking about layers, we’re only talking about logical organization of code. In no way is it implied that these layers might run on different computers or in … Read more
Definitely approach #1. Having your clients talk to multiple GraphQL services (as in approach #2) entirely defeats the purpose of using GraphQL in the first place, which is to provide a schema over your entire application data to allow fetching it in a single roundtrip. Having a shared nothing architecture might seem reasonable from the … Read more
First read: Concurrency vs Parallelism – What is the difference? Concurrency is the separation of tasks to provide interleaved execution. Parallelism is the simultaneous execution of multiple pieces of work in order to increase speed. —https://github.com/servo/servo/wiki/Design Short answer: With threads, the operating system switches running threads preemptively according to its scheduler, which is an algorithm … Read more
Update 2013-01-07: If you want to see a good mix of component-based game engine with the (in my opinion) superior approach of reactive programming take a look at the V-Play engine. It very well integrates QTs QML property binding functionality. We did some research on CBSE in games at our university and I collected some … Read more
You’re right yes. The architecture of a system is its ‘skeleton’. It’s the highest level of abstraction of a system. What kind of data storage is present, how do modules interact with each other, what recovery systems are in place. Just like design patterns, there are architectural patterns: MVC, 3-tier layered design, etc. Software design … Read more
Services come in 3 flavours: Domain Services, Application Services, and Infrastructure Services. Domain Services : Encapsulates business logic that doesn’t naturally fit within a domain object, and are NOT typical CRUD operations – those would belong to a Repository. Application Services : Used by external consumers to talk to your system (think Web Services). If … Read more
I would say, it depends on kind of dev team you are and your application needs. For example, if you require a lot of querying, that mostly means it would be more work for your developers to use Redis, where your data might be stored in variety of specialized data structures, customized for each type … Read more
Use POST. In 2010, using GET was probably an acceptable answer. But today (in 2013), browsers will pre-fetch pages they “think” you will visit next. Here is one of the StackOverflow developers talking about this issue on twitter: I’d like to thank my bank for making log off a GET request, and the Chrome team … Read more