For FFI, I would prefer some parts of the FFI, especially generic ones like Indirect Var Handles, to be promoted from the preview status. They are useful for non-FFI purposes. Has FFI API considered promoting APIs out of preview incrementally, like how Virtual Threads and Scoped values are?
Chen Liang On Tue, May 16, 2023 at 12:28 PM Remi Forax <fo...@univ-mlv.fr> wrote: > > ----- Original Message ----- > > From: "Uwe Schindler" <uschind...@apache.org> > > To: "core-libs-dev" <core-libs-dev@openjdk.org> > > Sent: Tuesday, May 16, 2023 5:38:32 PM > > Subject: JEP 442: Foreign Function & Memory API => why is it again preview > > API? > > > Hi, > > Hi Uwe, > > > > > yesterday Apache Lucene got the information that JDK 21 got the project > > panama JEP 442 update and I implemented it already in our source tree. > > > > Unfortunately the API is again marked "preview", but JDK 21 is "LTS > > release". Many of our users (Elasticserach, Solr) will be switching to > > this version. We were really hoping that the java.lang.foreign API is > > finished at that time. I checked the changes in our code: just a rename > > of a method and FileChannel#map now takes Arena instead of Scope. > > I see that Alan and Maurizio have already answer to your other points. > > Having preview features and being a LTS are to separate concerns. > Being a LTS is about support, having preview features is about having > feedback before finalizing an API. > > Java 17 was released with preview features, Java 21 will be. > > Before Java 10, when we were doing feature release model, if a feature was > not ready yet, either the release was delayed (Java 9 was delayed 3 times if > i'm remembering correctly) or postponed to the next big release (Java Module > was initially scheduled for Java 8). With the new cadence model, features > that are not ready yet are marked as preview. > > I understand that you are eager to use MemorySegment in anger but since a > looong time, Java features are only released when they are ready :) > > Also, it seems that we will have a LTS release every two years now, if a LTS > had no preview, it means that we will not get any feedback for 1/4 of the > releases. > > > > > Uwe > > > > regards, > Rémi > > > > > -- > > Uwe Schindler > > uschind...@apache.org > > ASF Member, Member of PMC and Committer of Apache Lucene and Apache Solr > > Bremen, Germany > > https://lucene.apache.org/ > > https://solr.apache.org/
