Interface Handler

shell/src/main/java/org/apache/kafka/shell/command/Commands.java:73–79

Command handler objects are instantiated with specific arguments to execute commands.

     * execute commands.
     */
    public interface Handler {
        void run(
            Optional<InteractiveShell> shell,
            PrintWriter writer,
            MetadataShellState state
        ) throws Exception;
    }

    /**
     * An object which describes a type of command handler. This includes