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Cristal-ise is a description-driven software platform originally developed to track the construction of the CMS ECAL detector of the LHC at CERN. This is its core library, known as the kernel, which manages business objects called Items. Items are entirely configured from data, called descriptions, held in other Items. Every change of a state in an Item is a consequence of an execution of an activity in that Item's lifecycle, meaning that Cristal-ise applications are completely traceable, even in their design. It also supports extensive versioning of Item description data, giving the system a high level of flexibility.

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/**
 * This file is part of the CRISTAL-iSE kernel.
 * Copyright (c) 2001-2015 The CRISTAL Consortium. All rights reserved.
 *
 * 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 3 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; with out 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.
 *
 * http://www.fsf.org/licensing/licenses/lgpl.html
 */
package org.cristalise.kernel.entity.proxy;

import org.cristalise.kernel.entity.C2KLocalObject;



public interface ProxyObserver
{
   /**************************************************************************
    * Subscribed items are broken apart and fed one by one to these methods.
    * Replacement after an event is done by feeding the new memberbase with the same id.
    * ID could be an XPath?
    **************************************************************************/
    public void add(V contents);

   /**************************************************************************
    * the 'type' parameter should be an indication of the type of object
    * supplied so that the subscriber can associate the call back with
    * one of its subscriptions. If we go with an Xpath subscription form,
    * then the id will probably be sufficient.
    * Should be comparable (substring whatever) with the parameter given to
    * the subscribe method of ItemProxy.
    **************************************************************************/
    public void remove(String id);
    
    public void control(String control, String msg);
}