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. ------------- Commit messages: - Avoids calling opIsStateful() during AbstractPipeline constructor Changes: https://git.openjdk.org/jdk/pull/16239/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=16239&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8318420 Stats: 24 lines in 1 file changed: 15 ins; 8 del; 1 mod Patch: https://git.openjdk.org/jdk/pull/16239.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/16239/head:pull/16239 PR: https://git.openjdk.org/jdk/pull/16239
