01: /*
02: * Copyright 2004 Sun Microsystems, Inc. All Rights Reserved.
03: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
04: *
05: * This code is free software; you can redistribute it and/or modify it
06: * under the terms of the GNU General Public License version 2 only, as
07: * published by the Free Software Foundation. Sun designates this
08: * particular file as subject to the "Classpath" exception as provided
09: * by Sun in the LICENSE file that accompanied this code.
10: *
11: * This code is distributed in the hope that it will be useful, but WITHOUT
12: * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13: * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14: * version 2 for more details (a copy is included in the LICENSE file that
15: * accompanied this code).
16: *
17: * You should have received a copy of the GNU General Public License version
18: * 2 along with this work; if not, write to the Free Software Foundation,
19: * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20: *
21: * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
22: * CA 95054 USA or visit www.sun.com if you need additional information or
23: * have any questions.
24: */
25:
26: package sun.jvmstat.perfdata.monitor;
27:
28: import sun.jvmstat.monitor.*;
29: import sun.management.counter.Variability;
30: import java.nio.ByteBuffer;
31:
32: /**
33: * Class for monitoring a constant PerfData String instrument. The
34: * value associated with a constant string instrument is fixed at
35: * the string instrument's creation time. Its value and length never
36: * change.
37: *
38: * @author Brian Doherty
39: * @version 1.8, 05/05/07
40: * @since 1.5
41: */
42: public class PerfStringConstantMonitor extends PerfStringMonitor {
43:
44: /**
45: * The cached value of the string instrument.
46: */
47: String data;
48:
49: /**
50: * Constructor to create a StringMonitor object for the constant string
51: * instrument object represented by the data in the given buffer.
52: *
53: * @param name the name of the instrumentation object
54: * @param supported support level indicator
55: * @param bb the buffer containing the string instrument data
56: */
57: public PerfStringConstantMonitor(String name, boolean supported,
58: ByteBuffer bb) {
59: super (name, Variability.CONSTANT, supported, bb);
60: this .data = super .stringValue();
61: }
62:
63: /**
64: * {@inheritDoc}
65: */
66: public Object getValue() {
67: return data; // return the cached string
68: }
69:
70: /**
71: * {@inheritDoc}
72: */
73: public String stringValue() {
74: return data; // return the cached string
75: }
76: }
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