[jdk17u-dev] RFR: 8316580: HttpClient with StructuredTaskScope does not close when a task fails [v3]

[Goetz Lindenmaier]

> I backport this for parity with 17.0.17-oracle.
> 
> The change applies clean, but the test does not work out-of-the-box.
> 
> It calls some utility methods ReferenceTracker.java that were added by JDK-8305847.
> That change is not in the current list of backports, so I added the utility methods 
> to this change.
> 
> Further, the test depends on the fact that in 21 a row of classes implement
> AutoClosable, which they don't do in 21.
> I adapted a row of places to work around this. 
> A try-with-resources statement was easy to replace, as the missing 
> close() implementation uses public methods, so that I could copy the
> code to the test.
> In TestTaskScope I replaced close()  by shutdownNow().
> Finally I removed the "useReferenceTracker=false" test variant, as the
> HttpClient implementation is quite far off of the implementation in 21.

Goetz Lindenmaier has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains six additional commits since the last revision:

 - Call shutdownNow in TestTaskScope.close()
 - Merge branch 'master' into goetz_backport_8316580
 - more graceful close() implementation
 - Adapt test to missing AutoClosable etc.
 - Parts of 8305847
 - Backport d8291f593762ab270bf05643b87c57578d716242

-------------

Changes:
  - all: https://git.openjdk.org/jdk17u-dev/pull/3706/files
  - new: https://git.openjdk.org/jdk17u-dev/pull/3706/files/622ef2fd..9abc3cb0

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=3706&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=3706&range=01-02

  Stats: 4048 lines in 193 files changed: 2151 ins; 926 del; 971 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/3706.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/3706/head:pull/3706

PR: https://git.openjdk.org/jdk17u-dev/pull/3706