What is the role of Cloud platforms? — Continuing from part 2 https://medium.com/@yatmanwong/apr1-placeholder-299b8173cdb4 In the previous articles, we explored how the internet model enable computers to talk to other computers. Here is the problem: how to connect the code we developers write on our computers to all these internet infrastructure to get on the internet. You see where…

Considerations on should you use GraphQL — What is GraphQL? GraphQL is a query language for APIs and a runtime for fulfilling those queries with your existing data. GraphQL provides a complete and understandable description of the data in your API. It gives clients the power to ask for exactly what they need. …

It is in your best interest to know enough about the internet — Continuing from part 1 https://medium.com/@yatmanwong/apr1-placeholder-299b8173cdb4 The transport layer The network layer figures out how to send packages from one network to another network. The transport layer finalizes the concept of communication by ensuring the end to end delivery of the entire message. Port is introduced at this layer to enable one process from…

All developers know this one right? — The Network Model The network model defines how computers can talk to other computers. The History yeah, that’s nothing today. But back in the 1960s, that was “the new thing.” Companies were doing their own things to connect their own computers. Computer from one network cannot talk to computer from another network. Later these people…

Sometimes may be better to handle the rules yourself — I want to share about the difficulties I ran into when using a rule engine. The specific tool I used is Drools. I still think rule engine has its place in the decision making process, but in practice it is only useful if the rules has no dependencies on each…

A beginner guide to authentication and authorization — Like the http protocol were designed to transfer information between networked devices, SSO, OIDC, OAuth2 are all protocols designed to grant user access permission to resource between services. They are all related because they are extended concept of one another, but they solve different aspect of this user permission problem.

The most critical piece of the debug process — Use Case The backend application I work on use Splunk for the logging service. Splunk provide an easy way to view our logs once our application is deployed on Azure. Splunk has a powerful search and filter feature. It is also the root of our bug discovery and onCall process. …

What goes on in this api call? — One major feature I been working on is “Export Building”. It is an api that serves a zip csv file to the frontend when user click download. This article documents the problems I solved in this api: Response type Error handling Asynchronous processing Zip logic Java Stream OpenCSV Verify on…

Why are tables designed this way? — Introduction to database concepts Candidate keys are a minimum sets of attributes that can uniquely identify a row in a table Primary key is one of the Candidate key chosen to uniquely identify a row in the table Super key is a Candidate key + other attributes All Candidate keys are Super keys. …