I'm Arthur, a backend developer working mostly with the JVM. These are the notes I keep while figuring things out.
Mostly the JVM, databases, Linux and DevOps — plus whatever else comes up along the way.
blog/pointer-chasing.md
Swap a linked list for an array without touching the algorithm — and you get a speedup of several times. A JMH benchmark digs into why: cache misses, the dependency chain between reads, and just how much slower pointer chasing really is.
blog/disruptor-ringbuffer.md
A regular queue allocates a new object for every message and puts pressure on the GC. We look at how the LMAX Disruptor preallocates the entire RingBuffer and reuses event objects, taking allocations out of the producer's hot path.
blog/flow-lifecycle-guide.md
Kotlin development sometimes requires dealing with legacy callback interfaces. Here is how you can adapt a synchronous callback into a Flow
blog/bash-commands.md
A cheat sheet for commands I use often: find with filters, switching the Java version in Git Bash, connecting to PostgreSQL via psql.