1 /*
2 * Copyright (c) 1998-2002 The Jgroup Team.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU Lesser General Public License version 2 as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU Lesser General Public License for more details.
12 *
13 * You should have received a copy of the GNU Lesser General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
16 *
17 */
18
19 package jgroup.core;
20
21 import java.io.Externalizable;
22
23 /**
24 * Instances of classes that implement this interface uniquely identify
25 * invocations issued by a client. Each invocation identifier is
26 * composed by a virtual machine identifier, which identifies the
27 * client, and a progressive counter used to distinguish among
28 * invocations performed by the same client.
29 *
30 * @author Alberto Montresor
31 * @since Jgroup 0.9
32 */
33 public interface IID
34 extends Externalizable
35 {
36
37 /**
38 * Returns the <code>VMID</code> identifier of the virtual machine
39 * that generated this invocation.
40 */
41 public VMID getVmid();
42
43
44 /**
45 * Returns the sequential counter identifying this particular
46 * invocation.
47 */
48 public int getCounter();
49
50 } // END IID