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We need static factory creation methods on java.nio.channels.SocketChannel and java.nio.channels.ServerSocketChannel which take a ProtocolFamily public class SocketChannel { public static SocketChannel open(ProtocolFamily family) throws IOException } public class ServerSocketChannel { public static ServerSocketChannel open(ProtocolFamily family) throws IOException } together with supporting spi methods in SelectorProvider. The behavior should be equivalent to the similar existing method on DatagramChannel, which is to support: StandardProtocolFamily.INET => an IPv4 only channel StandardProtocolFamily.INET6 => a dual stack IPv4/IPv6 channel on dual stack systems, and an IPv6 only channel on an IPv6 only system This will also facilitate the support of Unix domain as another standard protocol family. A prototype of this work is available in the JDK sandbox repo in the `JDK-8238770-branch` (note the different bug id).
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