001 /* 002 * hammurapi-rules @mesopotamia.version@ 003 * Hammurapi rules engine. 004 * Copyright (C) 2005 Hammurapi Group 005 * 006 * This program is free software; you can redistribute it and/or 007 * modify it under the terms of the GNU Lesser General Public 008 * License as published by the Free Software Foundation; either 009 * version 2 of the License, or (at your option) any later version. 010 * 011 * This program is distributed in the hope that it will be useful, 012 * but WITHOUT ANY WARRANTY; without even the implied warranty of 013 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 014 * Lesser General Public License for more details. 015 * 016 * You should have received a copy of the GNU Lesser General Public 017 * License along with this library; if not, write to the Free Software 018 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 019 * 020 * URL: http://http://www.hammurapi.biz 021 * e-Mail: support@hammurapi.biz 022 */ 023 package biz.hammurapi.rules; 024 025 import java.util.Collection; 026 027 /** 028 * Implementations manage collections for rules. 029 * Rules itself shall not maintain collections of 030 * facts and objects, but use CollectionManager. 031 * 032 * @author Pavel Vlasov 033 * @version ${Revision} 034 */ 035 public interface CollectionManager extends Negatable { 036 037 /** 038 * Retrieves collection from the manager. 039 * If a collection for this name doesn't exist it 040 * should be created. 041 * @param ruleName Name of the rule this collection belongs to. 042 * @param collectionName Name of the collection withing the rule. 043 * @return Collection, never null. 044 * @param lock Collection monitor for synchronization. 045 */ 046 Collection get(String ruleName, String collectionName, Object lock); 047 048 049 /** 050 * Clears all collections. 051 */ 052 void clear(); 053 }