Notes and cheat sheets about databases, Linux, the JVM, DevOps — and whatever else comes my way.
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/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/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.
blog/transactional.md
A breakdown of Spring's @Transactional annotation: transactions, ACID isolation levels, dirty reads and phantom phenomena, and the Proxy mechanism.