Source Code Cross Referenced for ObjectServer.java in  » Database-DBMS » db4o-6.4 » com » db4o » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database DBMS » db4o 6.4 » com.db4o 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /* Copyright (C) 2004 - 2007  db4objects Inc.  http://www.db4o.com
02:
03:        This file is part of the db4o open source object database.
04:
05:        db4o is free software; you can redistribute it and/or modify it under
06:        the terms of version 2 of the GNU General Public License as published
07:        by the Free Software Foundation and as clarified by db4objects' GPL 
08:        interpretation policy, available at
09:        http://www.db4o.com/about/company/legalpolicies/gplinterpretation/
10:        Alternatively you can write to db4objects, Inc., 1900 S Norfolk Street,
11:        Suite 350, San Mateo, CA 94403, USA.
12:
13:        db4o is distributed in the hope that it will be useful, but WITHOUT ANY
14:        WARRANTY; without even the implied warranty of MERCHANTABILITY or
15:        FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
16:        for more details.
17:
18:        You should have received a copy of the GNU General Public License along
19:        with this program; if not, write to the Free Software Foundation, Inc.,
20:        59 Temple Place - Suite 330, Boston, MA  02111-1307, USA. */
21:        package com.db4o;
22:
23:        import com.db4o.config.Configuration;
24:        import com.db4o.ext.*;
25:
26:        /**
27:         * the db4o server interface.
28:         * <br><br>- db4o servers can be opened with {@link Db4o#openServer(String, int)}.<br>
29:         * - Direct in-memory connections to servers can be made with {@link #openClient()} <br>
30:         * - TCP connections are available through {@link Db4o#openClient(String, int, String, String)}.
31:         * <br><br>Before connecting clients over TCP, you have to 
32:         * {@link #grantAccess(String, String)} to the username and password combination
33:         * that you want to use. 
34:         * @see Db4o#openServer(java.lang.String, int) Db4o.openServer
35:         * @see ExtObjectServer ExtObjectServer for extended functionality
36:         */
37:        public interface ObjectServer {
38:
39:            /**
40:             * closes the {@link ObjectServer } and writes all cached data.
41:             * <br><br>
42:             * @return true - denotes that the last instance connected to the
43:             * used database file was closed.
44:             */
45:            public boolean close();
46:
47:            /**
48:             * returns an  {@link ObjectServer } with extended functionality.
49:             * <br><br>Use this method as a convenient accessor to extended methods. 
50:             * Every  {@link ObjectServer } can be casted to an {@link com.db4o.ext.ExtObjectServer}.
51:             * <br><br>The functionality is split to two interfaces to allow newcomers to
52:             * focus on the essential methods.
53:             */
54:            public ExtObjectServer ext();
55:
56:            /**
57:             * grants client access to the specified user with the specified password.
58:             * <br><br>If the user already exists, the password is changed to 
59:             * the specified password.<br><br>
60:             * @param userName the name of the user
61:             * @param password the password to be used
62:             */
63:            public void grantAccess(String userName, String password);
64:
65:            /**
66:             * opens a client against this server.
67:             * 
68:             * <br><br>A client opened with this method operates within the same VM
69:             * as the server. Since an embedded client can use direct communication, without
70:             * an in-between socket connection, performance will be better than a client
71:             * opened with 
72:             * {@link Db4o#openClient(java.lang.String, int, java.lang.String, java.lang.String)}
73:             * 
74:             * <br><br>Every client has it's own transaction and uses it's own cache
75:             * for it's own version of all peristent objects.  
76:             * 
77:             */
78:            public ObjectContainer openClient();
79:
80:            /**
81:             * See {@link #openClient()}
82:             * 
83:             * @param config a custom {@link Configuration Configuration} instance to be obtained via {@link Db4o#newConfiguration()}
84:             * @return an open {@link ObjectContainer ObjectContainer}
85:             */
86:            public ObjectContainer openClient(Configuration config);
87:
88:        }
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