Concurrency on Sven Ruppert

Rethinking Java Streams: Gatherer for more control and parallelism

sven.ruppert@gmail.com (Sven Ruppert) — Wed, 02 Apr 2025 20:58:21 +0000

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 targeted aggregation - in the form of lists, maps, strings or more complex data structures. Until Java 20 the processing was done Collector-Instances were regulated, which internally consisted of a supplier, an accumulator, a combiner and optionally a finisher. This model works well for simple accumulations but has noticeable limitations, particularly for complex, stateful, or conditional aggregations.

The History of Parallel Processing in Java: From Threads to Virtual Threads

sven.ruppert@gmail.com (Sven Ruppert) — Fri, 01 Nov 2024 22:02:37 +0000

Since the early days of computer science, parallel processing has represented one of the greatest challenges and opportunities. Since its inception in 1995, Java has undergone a significant journey in the world of parallel programming to provide developers with ever-better tools. This story is a fascinating journey through threads, the executor framework, fork/join, parallel streams, CompletableFuture and the latest developments in Project Loom. In this blog post, we take a detailed look at the evolution of parallel processing in Java and the innovations that came with it.