[foreign-preview] RFR: 8281855: Rename ResourceScope to MemorySession

[Quan Anh Mai]

On Tue, 15 Feb 2022 17:32:50 GMT, Maurizio Cimadamore <mcimadamore at openjdk.org> wrote:

> This patch implements some of the changes described in [1] and [2]. More specifically, the `ResourceScope` abstraction is renamed into `MemorySession`, and the session accessors in `MemorySegment`, `NativeSymbol` and `VaList` are tweaked to return *non-closeable* session views. To counteract this change, `MemorySession` now supports `equals` and `hashCode`, so that sessions views can be compared to each other in ways that are not identity-sensitive.
> 
> [1] - https://mail.openjdk.java.net/pipermail/panama-dev/2022-February/016152.html
> [2] - https://mail.openjdk.java.net/pipermail/panama-dev/2022-February/016254.html

src/java.base/share/classes/java/lang/foreign/MemorySegment.java line 305:

> 303:      * {@return a non-closeable view of the memory session associated with this memory segment}
> 304:      */
> 305:     MemorySession session();

Hi, could we take advantage of the type system and return a MemorySessionView which does not have a close method on it. Thanks.

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PR: https://git.openjdk.java.net/panama-foreign/pull/641