This is the CSR for JEP 428: Structured Concurrency (Incubator).

Summary

Add a basic API for "Structured Concurrency". Structured concurrency treats multiple tasks running in different threads as a single unit of work, thereby streamlining error handling and cancellation, improving reliability, and enhancing observability.

Problem

The Motivation section in the JEP outlines common pitfalls that can arise when writing concurrent code. In particular, a method might spawn a thread to run a subtask, and then return, leaving the subtask running in the background, its lifetime unclear from the code. Alternatively a concurrent subtask might fail, leaving its failure unnoticed and ignored.

Solution

Add a simple API that introduces developers to the concepts of structured concurrency on the one hand, while looking familiar by resembling existing constructs, like ExecutorService on the other. The JEP provides discussion and examples of the proposed solution.

The proposed API is in an incubator module, the module and package name proposed is jdk.incubator.concurrent.

Specification

The API docs are attached.