The Release Formula: R = ΔF + ΔNF + ΔQ

Lucas Jellema

TL;DR: a software release introduces changes in three areas: functional, non-functional and quality. Each change should contribute to identified objectives – and the contribution should be measurable. Product teams should strive for release statements that identify the changes, the objective they contribute to and the metric used for measuring their […]

How to unit test a SQL query?

Lucas Jellema 7

A simple challenge: I am working on a SQL query. Not a trivial query. I am trying various approaches. I believe I may have found a solution that works. That produces the correct solution. How can I be sure? How can I try to further refine the query while maintaining […]

The Prototype Pitfall

Lucas Jellema

TL;DR Prototyping is an essential way to determine the technical feasibility and functional desirability of features of a software system. There is a clear and present danger that the prototype is considered to be professional code, peer reviewed and production ready. This risk must be mitigated and anyone involved needs […]

Create OCI Function running a Playwright scenario

Lucas Jellema

TL;DR – How to create a Function on Oracle Cloud Infrastructure that uses the Playwright library for running headless browser scenarios, for example for Web UI Health Check and Performance Monitoring, for tactical integration and simple RPA and for web based reporting. The article shows a custom Docker container image […]

OpenAPI Support in Oracle API Gateway

Lucas Jellema

Today I read the announcement of OpenAPI (fka Swagger) support in API Gateway on OCI. I was wondering what that entailed and I decided to try it out. In short, this support means that an API definition can be uploaded to API Gateway, is validated for correctness and can be […]

Oracle Functions–Mental Picture vs. Physical Reality

Lucas Jellema

Oracle Functions are the Functions as a Service (or FaaS) offering on Oracle Cloud Infrastructure. Functions are the serverless, stateless execution engines that play such an important role in cloud native applications. Functions handle requests and events, contributing to live application behavior, streaming activities and integrations. Functions are also used […]

Automated Unit Testing of Javascript Fn Functions using Jest

Lucas Jellema

Crucial pieces of functionality in cloud native applications is implemented in Functions. In the case of Oracle Cloud Infrastructure specifically, the Functions framework is typically Project Fn and the implementation language of choice is … up to the DevOps team. Popular languages for implementing Functions include Go, Python, Java and […]