Source Code Cross Referenced for UserCache.java in  » Database-ORM » Speedo_1.4.5 » org » objectweb » speedo » usercache » api » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database ORM » Speedo_1.4.5 » org.objectweb.speedo.usercache.api 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /**
02:         * Copyright (C) 2001-2004 France Telecom R&D
03:         *
04:         * This library is free software; you can redistribute it and/or
05:         * modify it under the terms of the GNU Lesser General Public
06:         * License as published by the Free Software Foundation; either
07:         * version 2 of the License, or (at your option) any later version.
08:         *
09:         * This library is distributed in the hope that it will be useful,
10:         * but WITHOUT ANY WARRANTY; without even the implied warranty of
11:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12:         * Lesser General Public License for more details.
13:         *
14:         * You should have received a copy of the GNU Lesser General Public
15:         * License along with this library; if not, write to the Free Software
16:         * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
17:         */package org.objectweb.speedo.usercache.api;
18:
19:        /**
20:         * Defines an user cache of persistent objects. The user cache maintains 
21:         * bindings between an object identifier and the user key. This cache can be
22:         * implemented such as a coherent double map (oid=>key and key=>oid). 
23:         * The user cache entry can be removed (unbound) from the user key or from the
24:         * object identifier. Indeed when an object is removed from the real cache, the
25:         * persistent object is no more availlable, its user key too.
26:         * 
27:         * @author S.Chassande-Barrioz
28:         */
29:        public interface UserCache {
30:
31:            /**
32:             * Look for an identifier of persistent instance from an user key 
33:             * @param key is the user key of the searched persistent instance (not null)
34:             * @return the identifier of the persistent instance corresponding to the
35:             * user key. If not found, a null value is returned.
36:             */
37:            Object lookup(Object key);
38:
39:            /**
40:             * Adds an entry into user cache. If an entry already exists with the same
41:             * identifier or the same key, it has been replaced. 
42:             * 
43:             * @param key is the user key the user of the persistent instance (not null)
44:             * @param oid is the identifier of the persistent instance (not null)
45:             * 
46:             * @return the previous associated identifier of a persistent instance 
47:             * associated to the specified user key. The null value is returned if no 
48:             * entry was previously bound.
49:             */
50:            Object bind(Object key, Object oid);
51:
52:            /**
53:             * Forces the eviction of an entry from an user key
54:             * @param key is the user key of a persistent instance (not null)
55:             * @return the object identifier if found, otherwise null
56:             */
57:            Object unbindFromKey(Object key);
58:
59:            /**
60:             * Forces the eviction of an entry from an object identifier
61:             * @param oid is the identifier of a persistent instance (not null)
62:             * @return the user key if found, otherwise null
63:             */
64:            Object unbindFromOID(Object oid);
65:
66:            String getName();
67:
68:            int getId();
69:
70:            boolean isActive();
71:
72:            String[] getIndexFieldNames();
73:
74:        }
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