[EXTERNAL] Re: Support for Keepalive Extended Socket Options On Windows

[Terry Chow (Simba Technologies Inc)]

Hi Alan and Daniel,

Agreed, having Windows support the keepalive options as it's done on other platforms would be the best. But, lobbying them for that change would be extremely difficult as it would be very significant change that impacts the whole platform.

What defaults values do you guys have in mind? I'm still hesitating on persisting default values because the default values can vary between machines.

Thanks,
Terry
________________________________
From: Alan Bateman <Alan.Bateman at oracle.com>
Sent: June 4, 2023 7:32 AM
To: Daniel Fuchs <daniel.fuchs at oracle.com>; Terry Chow (Simba Technologies Inc) <v-terrychow at microsoft.com>; net-dev at openjdk.org <net-dev at openjdk.org>
Subject: [EXTERNAL] Re: Support for Keepalive Extended Socket Options On Windows

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On 04/06/2023 10:49, Daniel Fuchs wrote:
> Hi,
>
> Could we maybe cache the values in the SocketImpl/NIOSocketImpl
> implementation?
>
> IIRC we do something like that for SO_TIMEOUT already, since this
> is handled at NIO level.
>
> If we know the default value then setting one (when the other is
> not set) could set it with the supplied value for the one, and
> the default (or cached value) for the other?
>
> Get would then return the cached value (or possibly default
> value if not set?)
>
> We could also potentially set some sensible defaults when creating
> the socket.
>
Yes, this is what I was suggesting in PR14232 too but it will likely be
a disruptive change. It can be prototyped at least, then we can see how
we could turn it into something that is maintainable. The best outcome
would of course be for Windows to expose the socket options in the same
way as Linux, macOS and others.

-Alan
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