com.threerings.presents.dobj.Subscriber Maven / Gradle / Ivy
//
// $Id: Subscriber.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.presents.dobj;
/**
* A subscriber is an entity that has access to a distributed object. The
* process of obtaining access to a distributed object is an asynchronous
* one, and changes made to an object are delivered asynchronously. By
* registering as a subscriber to an object, an entity can react to
* changes made to an object and ensure that their object is kept up to
* date.
*
* To actually receive callbacks when events are dispatched on a
* distributed object, an entity should register itself as a listener on
* the object once it has received its object reference.
*
* @see EventListener
* @see AttributeChangeListener
* @see SetListener
* @see OidListListener
*
* @param the type object being subscribed to.
*/
public interface Subscriber
{
/**
* Called when a subscription request has succeeded and the object is
* available. If the object was requested for subscription, the
* subscriber can subsequently receive notifications by registering
* itself as a listener of some sort (see {@link
* DObject#addListener}).
*
* @see DObjectManager#subscribeToObject
*/
void objectAvailable (T object);
/**
* Called when a subscription request has failed. The nature of the
* failure will be communicated via the supplied
* ObjectAccessException.
*
* @see DObjectManager#subscribeToObject
*/
void requestFailed (int oid, ObjectAccessException cause);
}