RFR: 8308310: HttpClient: Avoid logging or locking from within synchronized blocks [v8]

[Jaikiran Pai]

On Tue, 23 May 2023 15:11:10 GMT, Daniel Fuchs <dfuchs at openjdk.org> wrote:

>> Please find here a change that revisits usage of monitors in the HttpClient.
>> 
>> With Virtual Threads now part of the platform it should be possible to pass a newVirtualThreadPerTaskExecutor to the HttpClient. Logging, when enabled, and when called from a synchronized block, can cause the carrier thread to get pinned in case of contention when printing through the underlying PrintStream.
>> 
>> This change aims at avoiding situations where the carrier threads might get pinned.
>
> Daniel Fuchs has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 11 commits:
> 
>  - Merge branch 'master' into HttpClient-Logging-8308310
>  - Merge branch 'master' into HttpClient-Logging-8308310
>  - Fix whitespace
>  - make stateLock final
>  - Add debug traces to ExpectContinueTest.java
>  - failedRef should be final
>  - Align parameters
>  - Update src/java.net.http/share/classes/jdk/internal/net/http/Http1Response.java
>    
>    Co-authored-by: Andrey Turbanov <turbanoff at gmail.com>
>  - Update src/java.net.http/share/classes/jdk/internal/net/http/ConnectionPool.java
>    
>    Co-authored-by: Andrey Turbanov <turbanoff at gmail.com>
>  - Update test/jdk/java/net/httpclient/AuthFilterCacheTest.java
>    
>    Co-authored-by: Andrey Turbanov <turbanoff at gmail.com>
>  - ... and 1 more: https://git.openjdk.org/jdk/compare/c0c4d771...c5d2f1f2

test/jdk/java/net/httpclient/ManyRequests.java line 274:

> 272:             } catch (CompletionException e) {
> 273:                 if (!Platform.isWindows()) throw e;
> 274:                 if (LIMIT.get() < MAX_LIMIT) throw e;

Previously, `LIMIT.get()` was being compared against `MAX_COUNT`, because `REQUEST` was initialized (as `final`) to that value. Now it's being compared to `MAX_LIMIT`. Is this intentional?

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PR Review Comment: https://git.openjdk.org/jdk/pull/14038#discussion_r1203967858