01: /*
02: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
03: *
04: * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
05: *
06: * The contents of this file are subject to the terms of either the GNU
07: * General Public License Version 2 only ("GPL") or the Common
08: * Development and Distribution License("CDDL") (collectively, the
09: * "License"). You may not use this file except in compliance with the
10: * License. You can obtain a copy of the License at
11: * http://www.netbeans.org/cddl-gplv2.html
12: * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the
13: * specific language governing permissions and limitations under the
14: * License. When distributing the software, include this License Header
15: * Notice in each file and include the License file at
16: * nbbuild/licenses/CDDL-GPL-2-CP. Sun designates this
17: * particular file as subject to the "Classpath" exception as provided
18: * by Sun in the GPL Version 2 section of the License file that
19: * accompanied this code. If applicable, add the following below the
20: * License Header, with the fields enclosed by brackets [] replaced by
21: * your own identifying information:
22: * "Portions Copyrighted [year] [name of copyright owner]"
23: *
24: * Contributor(s):
25: *
26: * The Original Software is NetBeans. The Initial Developer of the Original
27: * Software is Sun Microsystems, Inc. Portions Copyright 1997-2007 Sun
28: * Microsystems, Inc. All Rights Reserved.
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30: * If you wish your version of this file to be governed by only the CDDL
31: * or only the GPL Version 2, indicate your decision by adding
32: * "[Contributor] elects to include this software in this distribution
33: * under the [CDDL or GPL Version 2] license." If you do not indicate a
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35: * your version of this file under either the CDDL, the GPL Version 2 or
36: * to extend the choice of license to its licensees as provided above.
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38: * Version 2 license, then the option applies only if the new code is
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40: */
41:
42: package org.netbeans.modules.cnd.modelimpl.memory;
43:
44: /**
45: * Allows to register listener that are notified in the case of low memory.
46: * Singleton.
47: * @author Vladimir Kvashin
48: */
49: public abstract class LowMemoryNotifier {
50:
51: /** proetcted constructor to prevent external creation */
52: protected LowMemoryNotifier() {
53: }
54:
55: public static LowMemoryNotifier instance() {
56: return instance;
57: }
58:
59: /** Registers low memory lstener */
60: public abstract void addListener(LowMemoryListener listener);
61:
62: /** Unregisters low memory lstener */
63: public abstract void removeListener(LowMemoryListener listener);
64:
65: /**
66: * Sets the memory usage percentage threshold to the given value
67: * @param percentage the new threshold value in percents
68: */
69: public abstract void setThresholdPercentage(double percentage);
70:
71: private static LowMemoryNotifier instance = new LowMemoryNotifierImpl();
72: }
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