On Wed, 6 Nov 2024 15:47:55 GMT, Alan Bateman <al...@openjdk.org> wrote:
> Changes for [JEP 505: Structured Concurrency (Fifth > Preview)](https://openjdk.org/jeps/8340343). The proposal is to re-preview > the API with some changes, specifically: > > - A > [StructuredTaskScope](https://download.java.net/java/early_access/loom/docs/api/java.base/java/util/concurrent/StructuredTaskScope.html) > is now opened with a static factory method instead of a constructor. Once > opened, the API usage is unchanged: fork subtasks individually, join them as > a unit, process outcome, and close. > - In conjunction with moving to using a static open method, policy and > desired outcome is now selected by specifying a Joiner to the open method > rather than extending STS. A Joiner handles subtask completion and produces > the result for join to return. Joiner.onComplete is the equivalent of > overriding handleComplete previously. This change means that the subclasses > ShutdownOnFailure and ShutdownOnSuccess are removed, replaced by factory > methods on Joiner to get an equivalent Joiner. > - The join method is changed to return the result or throw > STS.FailedException, replacing the need for an API in subclasses to obtain > the outcome. This removes the hazard that was forgetting to call > throwIfFailed to propagate exceptions. > - Configuration that was provided with parameters for the constructor is > changed so that can be provided by a configuration function. > - joinUntil is replaced by allowing a timeout be configured by the > configuration function. This allows the timeout to apply the scope rather > than the join method. > > The underlying implementation is unchanged except that ThreadFlock.shutdown > and wakeup methods are no longer confined. The STS API implementation moves > to non-public StructuedTaskScopeImpl because STS is now an interface. A > non-public Joiners class is added with the built-in Joiner implementations. This pull request has now been integrated. Changeset: 132a890a Author: Alan Bateman <al...@openjdk.org> URL: https://git.openjdk.org/jdk/commit/132a890a9b3b70f2358237ebd9242b6747ba03dd Stats: 4036 lines in 14 files changed: 1818 ins; 1438 del; 780 mod 8342486: Implement JEP 505: Structured Concurrency (Fifth Preview) Co-authored-by: Alan Bateman <al...@openjdk.org> Co-authored-by: Viktor Klang <vkl...@openjdk.org> Reviewed-by: vklang ------------- PR: https://git.openjdk.org/jdk/pull/21934
