The SocketNode class is a part of the Logback library that can be used as a part of a logging infrastructure that uses multiple nodes to send log events over a socket.

A typical usage scenario would be having a central Logback instance, that acts as the master, and several other Logback instances, which are the slaves. The slaves send log events to the master over a socket connection, and the master then processes the log events.

Here is an example of how you might use the SocketNode class in a Java program as a slave node to send log events to a master node:

import ch.qos.logback.classic.Logger;
import ch.qos.logback.classic.net.SimpleSocketServer;
import ch.qos.logback.classic.net.SocketNode;

public class LoggingSlave {
    public static void main(String[] args) {
        Logger logger = (Logger) LoggerFactory.getLogger(LoggingSlave.class);

        SocketNode socketNode = new SocketNode("127.0.0.1", 4560);
        socketNode.start();

        logger.info("This is a test log message sent to the master node.");

        socketNode.stop();
    }
}

In this example, a SocketNode object is created and configured to connect to the master node on IP address "127.0.0.1" and port 4560. The SocketNode is then started to open the socket connection to the master node. After that, a log event is sent to the master node, and the SocketNode is stopped.

It's important to notice that this example is only creating the slave side, you still have to have a master node running and ready to receive the logs.

You can check logback documentation for more information and options available, such as SSL support, reconnection delay and other such features.