bytedeco/javacpp

JDK 15 Panama Support ( Sealed Classes , Foreign-Memory )

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#402 opened on May 28, 2020

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enhancementhelp wanted

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Description

Unfortunately this annotation does not show up in the online javadoc, but I can still see it using my IDE (Eclipse), and I assume that other IDEs provide a similar mechanism, so that is a fast way to check:

JDK 14-15 will have much great features like:

Sealed Classes: https://jaxenter.com/java-15-news-170322.html

JDK 14 Foreign-Memory Access API: https://medium.com/@youngty1997/jdk-14-foreign-memory-access-api-overview-70951fe221c9

https://github.com/openjdk/panama-foreign/blob/foreign-jextract/doc/panama_jextract.md

and

http://www.deepnetts.com/blog/what-is-project-panama-and-why-is-it-important-for-machine-learning-on-java-platform.html

Sealed Classes and Foreign-Memory Access will improve performance much. It would be good to see these features in JavaCPP

So Libraries generated with JavaCPP will be much faster then before.

There is also preview JDK 15 https://github.com/openjdk/panama-foreign

JDK 9 also have Java 9 adds the @HotSpotIntrinsicCandidate annotation. Methods annotated with that annotation will have intrinsics for them. intrinsics functions are direct call functions that inline java calls as direct assembly intrinsics can be used powerful tool for javacpp

Project Panama also has SIMD in Java http://cr.openjdk.java.net/~thartmann/offsite_2018/Panama_Offsite_2018.pdf http://cr.openjdk.java.net/~vlivanov/panama/Generic.java https://github.com/openjdk/panama-foreign/blob/foreign-jextract/doc/panama_jextract.md

Contributor guide

Research direction
Study the Panama Foreign Memory Access API and Sealed Classes. Analyze JavaCPP's existing architecture for bridging Java and native C++. Look for any existing pull requests or branches that attempt to add Panama support. Identify the key components that need modification.
Tech stack
java
Domain
api
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
5
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Over 1 week
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Mostly clear
Prerequisites
JavaGit
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
25