Added Unix Domain Socket support.

[0xIO32]

It adds Unix Domain Socket support, so that it don't require a tcp port to be binded to work.

[astei]

This is a pretty clear API breakage (not to mention the fact it requires us to expose internal implementation details to plugins), and while it's been planned for the next major revision of Velocity, it's not been a high priority for a few reasons (mainly due to lack of time on my part).

[0xIO32]

I think it shouldn't break the api. In the only class in the api that i modified, i only added methods or modified private fields and added constructors, but removed or modified no existing components (except for the "ServerInfo" constructor to use the SocketAddress type as parameter and not the InetSocketAddress type, which shouldn't break something, because the type InetSocketAddress extends from it)

[astei]

Modifying the existing 2-ary constructor of ServerInfo constitutes API breakage. The class specifically asks for InetSocketAddress. While this is source code compatible (I can compile against this change), it's not binary compatible.

In addition, getAddress() is now broken - it's now possible that a ClassCastException can be thrown by the JVM, since you cannot cast DomainSocketAddress to an InetSocketAddress.

[0xIO32]

Yes i could add a third constructor with this type and for the getAddress() method, i could add a change, that the InetAddress.getLoopbackAddress() ( "127.0.0.1" ), will be used when it is a DomainSocketAddress. That would than break nothing?

[hugmanrique]

I don't see how to avoid the getAddress breakage sensibly. We will have to wait a bit, iirc I've seen some talks about a near-future major release launch in Discord.

I would prefer to see the commit mentioned in the other comment backported, since astei already tested those changes (the address parsing portion of this PR is a perfect candidate for some unit tests).

[0xIO32]

Now i removed the getAddress method, the AddressType enum and the constructor which was only used for not breaking the api.