Dependency Injection and Dependency Inversion
Dependency injection and dependency inversion are two terms that often come together but serve distinct meanings and purposes.
- python 13
- os 6
- testing 5
- aws 4
- kubernetes 3
- algorithm 3
- oop 3
- refactoring 3
- microservices 2
- networking 1
- redis 1
- c 1
- data structure 1
- kafka 1
- docker 1
- serverless 1
- cicd 1
- review 1
python
Preventing Flaky Tests and Brittle Tests
Flaky tests and brittle tests are two common pitfalls that make our tests unreliable and hard to maintain. In this post, I will illustrate these concepts wit...
Provision an Amazon EKS cluster with AWS CDK
Previously, I posted a tutorial on creating and configuring an Amazon VPC by using AWS CDK. All the examples in that post are based on L1 constructs to illus...
Memory Profiling CPython Applications with Memray
Memory management in modern programming languages is well-abstracted away from programmers. We do not have direct control over how our programs allocate and ...
Property Based Testing with Hypothesis
What is Property Based Testing? Property based testing, which is known to be originated by QuickCheck, is a testing technique which randomly generates test c...
Building a Serverless Function using Amazon API Gateway and AWS Lambda
This post is a quick tutorial to build a very simple serverless function using Amazon API Gateway and AWS Lambda.
Consumer-Driven Contract Testing with Pact
Consumer-driven contract testing (or CDC for short) is a testing methodology that ensures that providers are compatible with the expectations that the consum...
Single Responsibility Principle - explained with examples
The single-responsibility principle is one of the SOLID principles, the most widely accepted software design guide. I intentionally added “widely accepted” t...
Creating a VPC with AWS CDK
The AWS CDK(Cloud Development Kit) is an open-source framework to provision and manage the cloud resources using familiar programming languages.
Redlock: Distributed Lock Manager with Redis
A couple years ago, I discovered an issue caused by a race condition that occured in the backend application I was maintaining. So I implemented a simple dis...
Liskov Substitution Principle and Circle-ellipse Problem
The circle-ellipse problem, or square–rectangle problem, illustrates a limitation of OOP (object-oriented programming). Specifically, it violates the Liskov ...
Python Descriptors
A descriptor in Python is a class attribute which defines any of the special methods: __get__(self, obj, owner=None) -> value __set__(self, obj, valu...
Peformance Comparison between Flask and Sanic
Flask and Sanic Flask is one of the most popular micro web frameworks written in Python and I love using it for developing a wide range of web services becau...
os
Scheduling
A CPU scheduler is an operating system module that decides which process in the ready queue is allocated a CPU. It checks all of the tasks in the ready queue...
Thread Design Considerations
Thread Data Structures A user-level threading library has its own user-level thread data structure to represent threads in order to schedule and synchronize ...
pthreads
pthreads stands for POSIX Threads which is the de facto standard threading related API that operating systems need to support for thread managements. Almost ...
Threads and Concurrency
A traditional process has a single execution context that can only execute at one CPU at a given point of time. If a process can have multiple execution cont...
Processes
Definition A process is an instance of an executing program. It is also referred to as a “task” or “job”.
Operating System Overview
Definition An operating system, or OS, is just a software that abstracts and arbitrates the underlying hardware components in computer systems.
testing
Preventing Flaky Tests and Brittle Tests
Flaky tests and brittle tests are two common pitfalls that make our tests unreliable and hard to maintain. In this post, I will illustrate these concepts wit...
Provision an Amazon EKS cluster with AWS CDK
Previously, I posted a tutorial on creating and configuring an Amazon VPC by using AWS CDK. All the examples in that post are based on L1 constructs to illus...
Memory Profiling CPython Applications with Memray
Memory management in modern programming languages is well-abstracted away from programmers. We do not have direct control over how our programs allocate and ...
Property Based Testing with Hypothesis
What is Property Based Testing? Property based testing, which is known to be originated by QuickCheck, is a testing technique which randomly generates test c...
Consumer-Driven Contract Testing with Pact
Consumer-driven contract testing (or CDC for short) is a testing methodology that ensures that providers are compatible with the expectations that the consum...
aws
Provision an Amazon EKS cluster with AWS CDK
Previously, I posted a tutorial on creating and configuring an Amazon VPC by using AWS CDK. All the examples in that post are based on L1 constructs to illus...
Win 1st Place at AWS GameDay 2023 in Seoul
On April 14, my teammates and I participated in AWS GameDay 2023 and took 1st place. (team name: justintime @buzzni)
Building a Serverless Function using Amazon API Gateway and AWS Lambda
This post is a quick tutorial to build a very simple serverless function using Amazon API Gateway and AWS Lambda.
Creating a VPC with AWS CDK
The AWS CDK(Cloud Development Kit) is an open-source framework to provision and manage the cloud resources using familiar programming languages.
kubernetes
Provision an Amazon EKS cluster with AWS CDK
Previously, I posted a tutorial on creating and configuring an Amazon VPC by using AWS CDK. All the examples in that post are based on L1 constructs to illus...
Configuring GitOps with Argo CD
In this post, I am going to share my experience of configuring GitOps for a continuous deployment process. (FYI, you may refer to the following content for c...
How Kubelet Garbage Collection Fails (The Outbreak of Evicted Pods)
Since I’ve bootstrapped a K8s cluster and been administrating all by myself, I’ve encountered many problems and I have had to solve them on my own. One chall...
algorithm
Scheduling
A CPU scheduler is an operating system module that decides which process in the ready queue is allocated a CPU. It checks all of the tasks in the ready queue...
Redlock: Distributed Lock Manager with Redis
A couple years ago, I discovered an issue caused by a race condition that occured in the backend application I was maintaining. So I implemented a simple dis...
Timsort
Most programmers would be familiar with some fundamental sorting algorithms such as bubble sort, selection sort, insertion sort, and merge sort. Then which a...
oop
Dependency Injection and Dependency Inversion
Dependency injection and dependency inversion are two terms that often come together but serve distinct meanings and purposes.
Single Responsibility Principle - explained with examples
The single-responsibility principle is one of the SOLID principles, the most widely accepted software design guide. I intentionally added “widely accepted” t...
Liskov Substitution Principle and Circle-ellipse Problem
The circle-ellipse problem, or square–rectangle problem, illustrates a limitation of OOP (object-oriented programming). Specifically, it violates the Liskov ...
refactoring
Dependency Injection and Dependency Inversion
Dependency injection and dependency inversion are two terms that often come together but serve distinct meanings and purposes.
Single Responsibility Principle - explained with examples
The single-responsibility principle is one of the SOLID principles, the most widely accepted software design guide. I intentionally added “widely accepted” t...
Liskov Substitution Principle and Circle-ellipse Problem
The circle-ellipse problem, or square–rectangle problem, illustrates a limitation of OOP (object-oriented programming). Specifically, it violates the Liskov ...
microservices
Explaining the One-Version Rule and Monorepos in the context of Microservices
The organization I am currently working at develops applications built on microservice architecture, and we were trying to follow the internal policy that th...
Consumer-Driven Contract Testing with Pact
Consumer-driven contract testing (or CDC for short) is a testing methodology that ensures that providers are compatible with the expectations that the consum...
networking
Understanding HTTP with netcat
Any web developer would know about HTTP buy may not be familiar with the exact syntax of it because it’s abstracted by the network libraries.
redis
Redlock: Distributed Lock Manager with Redis
A couple years ago, I discovered an issue caused by a race condition that occured in the backend application I was maintaining. So I implemented a simple dis...
c
pthreads
pthreads stands for POSIX Threads which is the de facto standard threading related API that operating systems need to support for thread managements. Almost ...
data structure
pthreads
pthreads stands for POSIX Threads which is the de facto standard threading related API that operating systems need to support for thread managements. Almost ...
kafka
Consumer-Driven Contract Testing with Pact
Consumer-driven contract testing (or CDC for short) is a testing methodology that ensures that providers are compatible with the expectations that the consum...
docker
Building a Serverless Function using Amazon API Gateway and AWS Lambda
This post is a quick tutorial to build a very simple serverless function using Amazon API Gateway and AWS Lambda.
serverless
Building a Serverless Function using Amazon API Gateway and AWS Lambda
This post is a quick tutorial to build a very simple serverless function using Amazon API Gateway and AWS Lambda.
cicd
Configuring GitOps with Argo CD
In this post, I am going to share my experience of configuring GitOps for a continuous deployment process. (FYI, you may refer to the following content for c...
review
Book Review: Code Simplicity by Max Kanat-Alexander
Code Simplicity by Max Kanat-Alexander is an ambitious effort to define a set of principles, rules, and laws for software development. In my opinion, this is...