RFR: 8246039: SSLSocket HandshakeCompletedListeners are run on virtual threads [v2]

[Alan Bateman]

On Thu, 17 Sep 2020 14:37:15 GMT, Bradford Wetmore <wetmore at openjdk.org> wrote:

>> Carter Kozak has updated the pull request with a new target base due to a merge or a rebase. The pull request now
>> contains one commit:
>>   8246039: SSLSocket HandshakeCompletedListeners are run on virtual threads
>>   
>>   Previously each `SSLSocket.addHandshakeCompletedListener(HandshakeCompletedListener)`
>>   resulted in a new OS thread for each handshake which causes spikes in
>>   resource utilization and bottlenecks in high throughput systems.
>>   
>>   Virtual threads should reduce the overhead while preserving behavior to
>>   the extent possible.
>>   
>>   Reported to openjdk security-dev here:
>>   https://mail.openjdk.java.net/pipermail/security-dev/2020-July/022220.html
>
> Please wait for further consideration from Xuelei, but the changes seem good to me.

https://mail.openjdk.java.net/pipermail/security-dev/2020-September/022482.html

There is musing on possible alternatives to fix the issue but I think Brad and Xuelei are okay with changing it to
start a virtual thread per notification for now and see how it goes. So I'll merge this PR.

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PR: https://git.openjdk.java.net/loom/pull/16