CompletableFuture Internals

[ghost]

Q: How does it manage async execution internally?

[shivrajcodez]

Uses Thread Pools (ExecutorService / ForkJoinPool)
Tasks placed in queues → picked by worker threads
Non-blocking I/O via Java NIO (selectors, event loop)
Event-driven model (callbacks/futures)
High-level APIs → CompletableFuture, reactive frameworks
Flow:
Submit task → Queue → Thread executes → Callback/Future result