Sven RuppertApr 8

Just published a longform article on parallel collectors in Java Streams.

✅ Covers correctness, performance, pitfalls
🛠 Custom collectors with CONCURRENT semantics
🔬 JMH benchmark

TL;DR: .parallelStream() is not a magic wand.

https://svenruppert.com/2025/04/08/synchronous-in-chaos-how-parallel-collectors-bring-order-to-java-streams/

#Java #StreamsAPI #OpenJDK #Concurrency #FunctionalProgramming

Synchronous in Chaos: How Parallel Collectors Bring Order to Java Streams

Sometimes it’s not enough for something to work – it has to work under load. In modern applications that process large amounts of data, the Streams API in Java provides developers with …

Sven Ruppert
Sven RuppertApr 2

Java - Gatherer: a powerful new way to control Stream aggregation!

Inject, filter, finish early – even in parallel.

No frameworks. Pure Java. Learn how it works

#Java #StreamsAPI #Gatherer #JavaDev #Streams #java24

https://svenruppert.com/2025/04/02/rethinking-java-streams-gatherer-for-more-control-and-parallelism/

Rethinking Java Streams: Gatherer for more control and parallelism

Since version 8, Java has introduced an elegant, functional approach to processing data sets with the Streams API. The terminal operation collect(…) represents the bridge from the stream to a…

Sven Ruppert
Abraham SammaJan 12, 2023
Does anyone actually enjoy writing boilerplate code for reading and writing streams? I swear I am on the verge of tears right now. #streamsapi