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

[Carter Kozak]

> 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

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

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

Changes: https://git.openjdk.java.net/loom/pull/16/files
 Webrev: https://webrevs.openjdk.java.net/?repo=loom&pr=16&range=01
  Stats: 7 lines in 1 file changed: 0 ins; 2 del; 5 mod
  Patch: https://git.openjdk.java.net/loom/pull/16.diff
  Fetch: git fetch https://git.openjdk.java.net/loom pull/16/head:pull/16

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