“Adapter Pattern converts the interface of a class into another interface the clients expect. Adapter lets classes work together that couldn’t otherwise because of incompatible interfaces.”

Simple Example:
Suppose you are traveling from Europe to USA, since there are different outlets being used, you need an adapter/wrapper/converter for you to be able to use your devices.

Real-Life Example:
Suppose you are writing an app and you are using a Kafka client to consume messages from a topic.

This client has methods called consume and produce to read and write messages to a Kafka topic and the broker you are listening…

“Command Pattern encapsulates a request as an object, helping us to use it with different requests and support undo operation.”

Command Pattern is like ordering at a restaurant.

Chef does not hear orders from the client itself, he/she uses a helper.
(like a waiter/waitress)

As Recommendation & Personalization team, we lately have been working very hard to improve our scaling for Recommendations in Trendyol.

We’ve stopped using relational database and transformed our datasource to NoSQL (Couchbase) without losing essential features. We wanted to share our experiences and tell you why and how we did it.

Let’s first start with our legacy design:

Go is widely being used for backend programming and its community is growing larger each day. Personally I love coding in Go.
I wanted to show a quick guide on how to gracefully shutdown our Go applications, which is actually a very easy process.

This story is about how to implement graceful shutdown in Go with a
step-by-step guide.
So this story considers you already know why we need to gracefully shutdown our applications from other programming languages.

Signals

A signal is an event generated from UNIX and Linux systems in response to some condition and Go can listen to these…

Go is widely being used for backend programming and its community is growing larger each day. Personally I love coding in Go.

Lately I was working on a project that has optional fields in its datasource and needed to manipulate the response based on business needs.
I thought it’d be a good idea to make a small tutorial about it.

Let’s create a simple struct and see the response:

Go is widely being used for backend programming and its community is growing larger each day. Most people choose Go because of its easy-to-implement concurrency abilities.

This story is about how to implement concurrency in Go with a step-by-step guide. So this story considers you already know the basics of concurrency from other programming languages.

Why Go?

Lightweight: Creating a goroutine requires only 2 KB of heap space. They grow by allocating and freeing up space as needed. For comparison, Threads get created with 1 MB. A server that processes incoming requests can easily create a goroutine per request.

Doesn’t use OS…

Favorites in Trendyol, most people in Turkey have either used it or heard it.

We’ve stopped using GraphDB and transformed our datasource to NoSQL (Couchbase) without losing essential features. We wanted to share our experiences and tell you why and how we did it.

Let’s first start with our legacy design:

Lately, in our team in Trendyol, we’ve slowly adapted Quarkus for our Java projects, due to its high performance (and we definitely recommend it!).

In this particular API, we wanted to send messages to a topic and we were pretty used to doing it in Spring, but it was our first try in Quarkus.

We’ve spent lots of time getting the hang of it. So I wanted to share how you can implement it and save you the trouble.

Eclipse Microprofile Reactive Messaging (the Reactive Messaging Client which Quarkus’ official documentation uses) didn’t support what we wanted to accomplish.

It…