01: /*
02: * Distributed as part of c3p0 v.0.9.1.2
03: *
04: * Copyright (C) 2005 Machinery For Change, Inc.
05: *
06: * Author: Steve Waldman <swaldman@mchange.com>
07: *
08: * This library is free software; you can redistribute it and/or modify
09: * it under the terms of the GNU Lesser General Public License version 2.1, as
10: * published by the Free Software Foundation.
11: *
12: * This software is distributed in the hope that it will be useful,
13: * but WITHOUT ANY WARRANTY; without even the implied warranty of
14: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15: * GNU Lesser General Public License for more details.
16: *
17: * You should have received a copy of the GNU Lesser General Public License
18: * along with this software; see the file LICENSE. If not, write to the
19: * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
20: * Boston, MA 02111-1307, USA.
21: */
22:
23: package com.mchange.v2.holders;
24:
25: import java.io.*;
26: import com.mchange.v2.ser.UnsupportedVersionException;
27:
28: public final class ChangeNotifyingSynchronizedIntHolder implements
29: ThreadSafeIntHolder, Serializable {
30: transient int value;
31: transient boolean notify_all;
32:
33: public ChangeNotifyingSynchronizedIntHolder(int value,
34: boolean notify_all) {
35: this .value = value;
36: this .notify_all = notify_all;
37: }
38:
39: public ChangeNotifyingSynchronizedIntHolder() {
40: this (0, true);
41: }
42:
43: public synchronized int getValue() {
44: return value;
45: }
46:
47: public synchronized void setValue(int value) {
48: if (value != this .value) {
49: this .value = value;
50: doNotify();
51: }
52: }
53:
54: public synchronized void increment() {
55: ++value;
56: doNotify();
57: }
58:
59: public synchronized void decrement() {
60: --value;
61: doNotify();
62: }
63:
64: //must be called from a sync'ed block...
65: private void doNotify() {
66: if (notify_all)
67: this .notifyAll();
68: else
69: this .notify();
70: }
71:
72: //Serialization
73: static final long serialVersionUID = 1; //override to take control of versioning
74: private final static short VERSION = 0x0001;
75:
76: private void writeObject(ObjectOutputStream out) throws IOException {
77: out.writeShort(VERSION);
78: out.writeInt(value);
79: out.writeBoolean(notify_all);
80: }
81:
82: private void readObject(ObjectInputStream in) throws IOException {
83: short version = in.readShort();
84: switch (version) {
85: case 0x0001:
86: this .value = in.readInt();
87: this .notify_all = in.readBoolean();
88: break;
89: default:
90: throw new UnsupportedVersionException(this, version);
91: }
92: }
93: }
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