@Override
    public void close() throws GuacamoleException {
        getSocket().close();
    }
Relinquishes exclusive write access to the Guacamole instruction
stream. This function should be called whenever a thread finishes using
a GuacamoleTunnel's GuacamoleWriter.
guacamole-common/src/main/java/org/apache/guacamole/net/AbstractGuacamoleTunnel.java