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: * The Original Software is NetBeans. The Initial Developer of the Original
26: * Software is Sun Microsystems, Inc. Portions Copyright 1997-2006 Sun
27: * Microsystems, Inc. All Rights Reserved.
28: *
29: * If you wish your version of this file to be governed by only the CDDL
30: * or only the GPL Version 2, indicate your decision by adding
31: * "[Contributor] elects to include this software in this distribution
32: * under the [CDDL or GPL Version 2] license." If you do not indicate a
33: * single choice of license, a recipient has the option to distribute
34: * your version of this file under either the CDDL, the GPL Version 2 or
35: * to extend the choice of license to its licensees as provided above.
36: * However, if you add GPL Version 2 code and therefore, elected the GPL
37: * Version 2 license, then the option applies only if the new code is
38: * made subject to such option by the copyright holder.
39: */
40:
41: package org.netbeans.lib.profiler.server.system;
42:
43: /**
44: * Provides methods for monitoring GC activities.
45: *
46: * @author Misha Dmitriev
47: */
48: public class GC {
49: //~ Static fields/initializers -----------------------------------------------------------------------------------------------
50:
51: public static final int OBSERVED_PERIODS = 10; // must match OBSERVED_PERIODS in GC.c
52:
53: //~ Methods ------------------------------------------------------------------------------------------------------------------
54:
55: public static native int getCurrentGCEpoch();
56:
57: /**
58: * Returns the following two numbers:
59: * metrics[0] - (Sum GC pause time for the last 10 periods) / (Total execution time for the last 10 periods) * 1000
60: * metrics[1] - last GC pause in microseconds
61: */
62: public static native void getGCRelativeTimeMetrics(long[] metrics);
63:
64: public static native void getGCStartFinishTimes(long[] start,
65: long[] finish);
66:
67: public static native void activateGCEpochCounter(boolean activate);
68:
69: /** Should be called at earliest possible time */
70: public static void initialize() {
71: // Doesn't do anything in this version
72: }
73:
74: /**
75: * Returns true if two instances of class Object are adjacent in memory.
76: * Used by our memory leak monitoring mechanism.
77: * Doesn't work (always returns true) in vanilla JDK 1.5
78: */
79: public static native boolean objectsAdjacent(Object o1, Object o2);
80:
81: public static native void resetGCEpochCounter();
82:
83: public static native void runGC();
84: }
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