Integrated: CODETOOLS-7902930: JOL: Bring back GraphWalker visitors

[Martin Junghanns]

On Mon, 12 Apr 2021 16:00:49 GMT, Martin Junghanns <github.com+318788+s1ck at openjdk.org> wrote:

> Hey @shipilev First of all: Thanks for this useful library. I wanted to switch from jol 0.10 to 0.15 in one of my projects because of some issues on openJDK 15. I discovered that the ability to register visitors had been removed at some point. The interface `org.openjdk.jol.info.GraphVisitor` is actually still around. I find that feature quite useful as it allows users to compute some custom statistics of the object graph. I tried to use the `GraphLayout` to access the GPRs, but it's all package-private.
> 
> It would be nice if we could bring the feature back. Also, if you think the approach is not ideal, we can maybe figure out something else.
> 
> Thanks for your time.

This pull request has now been integrated.

Changeset: 517f7e17
Author:    Martin Junghanns <martin.junghanns at neo4j.com>
Committer: Aleksey Shipilev <shade at openjdk.org>
URL:       https://git.openjdk.java.net/jol/commit/517f7e179c31eb44e5ffd1785b91176a3e385e4d
Stats:     19 lines in 4 files changed: 9 ins; 2 del; 8 mod

7902930: JOL: Bring back GraphWalker visitors

Reviewed-by: shade

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PR: https://git.openjdk.java.net/jol/pull/15