gozirra-ws/src/main/java/com/hi3project/vineyard/comm/stomp/gozirraws/Stomp.java
public void unsubscribe( String name, Listener l ) {
    synchronized (_listeners) {
      List list = (List)_listeners.get( name );
      if (list != null) {
        list.remove( l );
        if (list.size() == 0) {
          unsubscribe( name );
        }
      }
    }
  }
public void unsubscribe( String name, Listener l ) {
    synchronized (_listeners) {
      List list = (List)_listeners.get( name );
      if (list != null) {
        list.remove( l );
        if (list.size() == 0) {
          unsubscribe( name );
        }
      }
    }
  }
Unsubscribe a single listener from a channel.  This does not
send a message to the server unless the listener is the only
listener of this channel.

@param name The name of the channel to unsubscribe from.
@param l The listener to unsubscribe