WIP: Add unix socket support?

[javaarchive]

Works on my machine borrowing most of the code from the tcp adapter. Has some implementation issues that I'll be putting as a list here:

• peer and remote address is set to a filler value because there is a different SocketAddr type than required, not sure how I can convert between the two.
• As seen in #171 , the path of the unix socket is currently hacked in via other options and the SocketAddr is completley ignored, considering using an Option here.
• Throughput has no native UnixSocket test yet.

[javaarchive]

Tested in release, websocket is only slow in debug for some reason, here is an output from the same computer for reference:

Sending 1GB in chunks of 65507 bytes:

message-io Udp:  	Throughput: 9.24 GB/s
message-io Tcp:  	Throughput: 5.68 GB/s
message-io FramedTcp:  	Throughput: 4.49 GB/s
message-io Ws:  	Throughput: 1.85 GB/s
message-io UnixSocket:  	Throughput: 9.61 GB/s

native Udp: 		Throughput: 10.24 GB/s
native Tcp: 		Throughput: 6.08 GB/s
native FramedTcp: 	Throughput: 4.78 GB/s
native Ws: 		Throughput: 1.94 GB/s

[javaarchive]

Discovered implementation issue where messages sent after each other without a sleep are dropped.

Edit: this is fine for the stream based protocol

[javaarchive]

Datagram support throughput (in debug). For release: I'm still finding it odd that the stream based transport slows down in release but that might just be variation while I'm testing this.

[javaarchive]

Due to unix datagram sockets not really having an IPv4 or IPv6 that fits in the SocketAddr struct, the implementation is partially broken for now. I may see if I can change the types on a separate branch as an experiment.

[lemunozm]

Hi @javaarchive, Mmmm... interesting the throughput issue. At such speeds could be noise in the runs. Is it always faster in debug or sometimes?