RFR: 8310996: Add JFR event for connect operations [v3]

[Alan Bateman]

On Tue, 5 Nov 2024 16:48:14 GMT, Tim Prinzing <tprinzing at openjdk.org> wrote:

>> Adds a JFR event for socket connect operations.
>> 
>> Existing tests TestSocketEvents and TestSocketChannelEvents modified to also check for connect events.
>
> Tim Prinzing has updated the pull request incrementally with one additional commit since the last revision:
> 
>   improved exception names and handling

Discussed with Tim as there are a number of issues that will need attention. A SocketConnectEvent should only be "offered" for connect events, not cases such as "already connected" or "socket closed". For SocketChannel there is also a socket adaptor (blockingConnect method) that will need to be updated. The non-blocking connect/finishConnect is complicated and there are several issues there. Finally, remoteAddress requires stateLock.

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PR Comment: https://git.openjdk.org/jdk/pull/21528#issuecomment-2457759513