1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
|
/*
* Copyright (c) 2004, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package sun.jvmstat.perfdata.monitor;
import sun.jvmstat.monitor.*;
import sun.management.counter.Units;
import sun.management.counter.Variability;
import java.nio.ByteBuffer;
/**
* Class for monitoring a PerfData Byte Array instrumentation object.
*
* This class is provided to support the PerfStringMonitor classes.
* Instrumentation objects of this direct type currently cannot be
* created or monitored.
*
* @author Brian Doherty
* @since 1.5
* @see sun.jvmstat.instrument.ByteArrayInstrument
*/
public class PerfByteArrayMonitor extends AbstractMonitor
implements ByteArrayMonitor {
/**
* The buffer containing the data for the byte array instrument.
*/
ByteBuffer bb;
/**
* Constructor to create a ByteArrayMonitor for the byte array instrument
* represented by the data in the given buffer.
*
* @param name the name of the instrumentation object
* @param u the units of measure attribute
* @param v the variability attribute
* @param supported support level indicator
* @param bb the buffer containing the byte array instrument data
* @param vectorLength the length of the vector.
*/
public PerfByteArrayMonitor(String name, Units u, Variability v,
boolean supported, ByteBuffer bb,
int vectorLength) {
super(name, u, v, supported, vectorLength);
this.bb = bb;
}
/**
* {@inheritDoc}
* The object returned contains a byte[] with a copy of the current
* elements of the ByteArrayInstrument.
*
* @return Object - a copy of the current value of the elements of the
* byte array instrument. The return type is guaranteed
* to be of type byte[].
*/
public Object getValue() {
return byteArrayValue();
}
/**
* Get a copy of the elements of the byte array instrument.
*
* @return byte[] - a copy of the current value of the elements of the
* byte array instrument.
*/
public byte[] byteArrayValue() {
bb.position(0);
byte[] b = new byte[bb.limit()];
// copy the bytes
bb.get(b);
return b;
}
/**
* Get the current value of an element of the byte array instrument.
*
* @return byte - a copy of the current value of the element at index
* <tt>index</tt> of the byte array instrument.
*/
public byte byteAt(int index) {
bb.position(index);
return bb.get();
}
/**
* Get the maximum length of the byte array for this byte array instrument.
*
* @return int - the maximum length of the byte array.
*/
public int getMaximumLength() {
return bb.limit();
}
}
|