Extending Functional Pipelines with Gatherers

Venkat Subramaniam dives into a missing piece of Java’s stream API: extending intermediate pipeline steps. While we’ve long been able to customize the final collect operation via Collectors, there wasn’t a way to plug in your own logic mid-stream—until now.

He introduces the new gatherer method and Gatherers interface, walks through the various flavors you can choose, and offers practical advice on when each type shines. If you’ve ever wanted finer control over your data flow before the final aggregation, this deep-dive is for you.

Watch on YouTube