com.threerings.crowd.client.LocationObserver Maven / Gradle / Ivy
//
// $Id: LocationObserver.java 6407 2011-01-01 05:02:21Z dhoover $
//
// Narya library - tools for developing networked games
// Copyright (C) 2002-2011 Three Rings Design, Inc., All Rights Reserved
// http://code.google.com/p/narya/
//
// This library is free software; you can redistribute it and/or modify it
// under the terms of the GNU Lesser General Public License as published
// by the Free Software Foundation; either version 2.1 of the License, or
// (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
package com.threerings.crowd.client;
import com.threerings.crowd.data.PlaceObject;
/**
* The location observer interface makes it possible for entities to be
* notified when the client moves to a new location. It also provides a
* means for an entity to participate in the ratification process of a new
* location. Observers may opt to reject a request to change to a new
* location, probably because something is going on in the previous
* location that should not be abandoned.
*
* Note that these location callbacks occur on the main thread and
* should execute quickly and not block under any circumstance.
*/
public interface LocationObserver
{
/**
* Called when someone has requested that we switch to a new location.
* An observer may choose to veto the location change request for some
* reason or other.
*
* @return true if it's OK for the location to change, false if the
* change request should be aborted.
*/
boolean locationMayChange (int placeId);
/**
* Called when we have switched to a new location.
*
* @param place the place object that represents the new location or
* null if we have switched to no location.
*/
void locationDidChange (PlaceObject place);
/**
* This is called on all location observers when a location change
* request is rejected by the server or fails for some other reason.
*
* @param placeId the place id to which we attempted to relocate, but
* failed.
* @param reason the reason code that explains why the location change
* request was rejected or otherwise failed.
*/
void locationChangeFailed (int placeId, String reason);
}