4 posts
The final part of the JVM concurrency series. A four-question framework for choosing between Virtual Thread, Reactor, and Coroutines, plus the unique strengths of each technology and the most common misconceptions.
From the Pull vs Push model to the four Reactive Streams interfaces, Reactor's Mono/Flux and core operators, and backpressure — building a solid mental model of reactive programming.
From Thread and Runnable to Callable/Future, ExecutorService, and CompletableFuture — tracing how Java's concurrency API evolved toward "stop managing threads yourself."
Comparing how the Micrometer (library) approach and the OTel Java Agent (bytecode manipulation) approach work — a look inside premain, the Instrumentation API, and ByteBuddy code injection.