I created an Android app for World Health Organization long ago. I made different kinds of search engines before with full-text indexing. This time I wanted to do something different. I had only 4 days to make the app. They had different kinds of contents like
Plain text files
And they needed a search engine to search all the contents and show a unified result set ( Showing results in a same page with relevancy ). Now I could implement it in SQLite, but that would mean a lot of task and the gain would be much lesser than a document-based search engine like Apache Lucene.
Hello, everyone. I did many experiments in my life, one of them are social media marketing. I read a lot, discovered a lot. There are many opinions, different strategies. Not every thing is suitable for every scenario. Today I will be writing about the top ice cream brand, IGLOO, in Bangladesh, for which I did do something to sell out their new ice-cream line of 6-month-stock in 2 months, before they could even go to Television commercials and bill-boards! How did I do it? Read along…
As I built many applications before, when I started building with springboot, following the springboot books is not enough for my architectural needs. So, I ran into many critical problems by going beyond those books. I will write them up to help beginners in spring ecosystem like me.
I started writing my first spring and the first springboot application today. The project requires mongodb and mysql as databases. My application’s domain objects are highly hierarchical and we need to make different kinds of search engines for many child classes. So, there needs to be some violations from common patterns like “field shadowing”. Though it’s only for the purpose of data and search layer, it doesn’t affect the object model of the application. So, I needed to change field behavior in subclasses which are different entities or collections in Mongo store. Basically I needed to put a annotation on subclass to enable an index on a field.
Handling null can be problematic in code organization and management. So, there are two very common patterns used by experienced developers now and then. One is “Null object pattern”, where you return an object which states a missing object, and another is “Special Case Pattern”. This article is to “How you can write effective objects for those patterns and why you should use them instead of returning null or throwing exceptions”
I read through many discussions related to Singleton Patterns, and different developers dislike it for different reasons. Not all the reasons make a pattern evil, because many of those reasons doesn’t really make your software really bad. I will be writing here each of the reason, and try to explain whether the reason is justified to call Singleton Evil:
Interfaces were built to create public API and minimize client code to access fungible objects. I do use interfaces heavily for all the purposes you probably are familiar with. Today I would like to introduce a new and opinionated way I am using interfaces which helps me to create consistent structures of similar classes.
Yes, these are not the same terms, and I would say they are quite different in modern software architecture. It’s very frequent to see asynchronous and non-blocking terms are used interchangeably. Especially, when creating a thread to do some background task and letting the calling thread to continue without waiting for the new asynchronous thread.
But non-blocking now has a very deep meaning, better be said as “how much blocking our applications are”.
I am into studying reactive architectures right now. I was reading to build scalable architectures for web applications. I just ran into an article which I could not resist to read even though it’s about Android development: