Integrated: 8318420 : AbstractPipeline invokes overridden method in constructor

[Viktor Klang]

On Wed, 18 Oct 2023 09:45:53 GMT, Viktor Klang <vklang at openjdk.org> wrote:

> This PR corrects so that `opIsStateful()` is not invoked as a part of the java.util.stream.AbstractPipeline constructor—as `opIsStateful()` is intended to be overridden by subclasses, and as their own constructors have not run when their superclass constructor runs, this means that `opIsStateful()` cannot base its return value on any class members of the subclass.
> 
> Since `opIsStateful()` is only needed for parallel streams, we can therefor defer the invocation of `opIsStateful()` until evaluation-time, and as such we can remove the need for having an instance field to store the result of the invocation—making Stream instances potentially a tiny bit smaller, reducing Stream-construction overhead, while still preserving semantics.

This pull request has now been integrated.

Changeset: 200b5a27
Author:    Viktor Klang <vklang at openjdk.org>
Committer: Paul Sandoz <psandoz at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/200b5a27d4bc77e2628a80d8166ee5d6057ab0c5
Stats:     24 lines in 1 file changed: 15 ins; 8 del; 1 mod

8318420: AbstractPipeline invokes overridden method in constructor

Reviewed-by: psandoz

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PR: https://git.openjdk.org/jdk/pull/16239