concurrency.structured.md

Overview

1. TODO

Java 21 changes

Virtual Threads

1. Use simple "blocking" style IO with Virtual Thread
2. Alternative to CompletableFuture style development
   1. Choose either CompletableFuture or Virtual Threads, not both
   2. There's no point to use with CompletableFuture
3. Alternative to ExecutorService style development
   1. Don't use with thread pools (there's no point)
4. Meant for IO (like tokio) and Java NIO
   1. NOT meant CPU bound parallelism (like rayon) or Parallel streams
5. See https://openjdk.org/jeps/444
6. Performance: Usually need > 10K virtual threads to benefit

Structured concurrency

1. StructuredTaskScope
   1. Feels like ExecutorService with a better API
   2. Simpler cancellation
   3. Simpler waiting
   4. See https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/util/concurrent/StructuredTaskScope.html
   5. See https://docs.oracle.com/en/java/javase/21/core/structured-concurrency.html
   6. fork subtasks, then join
   7. See https://openjdk.org/jeps/453

Scoped Values

1. TODO:

Other Resources

1. TODO