2
|
1 |
/*
|
|
2 |
* Copyright 2004 Sun Microsystems, Inc. All Rights Reserved.
|
|
3 |
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
|
|
4 |
*
|
|
5 |
* This code is free software; you can redistribute it and/or modify it
|
|
6 |
* under the terms of the GNU General Public License version 2 only, as
|
|
7 |
* published by the Free Software Foundation. Sun designates this
|
|
8 |
* particular file as subject to the "Classpath" exception as provided
|
|
9 |
* 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.misc.Perf;
|
|
29 |
import sun.jvmstat.monitor.*;
|
|
30 |
import java.util.*;
|
|
31 |
import java.io.*;
|
|
32 |
import java.lang.reflect.*;
|
|
33 |
import java.nio.ByteBuffer;
|
|
34 |
|
|
35 |
/**
|
|
36 |
* Abstraction for the HotSpot PerfData instrumentation buffer. This class
|
|
37 |
* is responsible for acquiring access to the instrumentation buffer for
|
|
38 |
* a target HotSpot Java Virtual Machine and providing method level access
|
|
39 |
* to its contents.
|
|
40 |
*
|
|
41 |
* @author Brian Doherty
|
|
42 |
* @since 1.5
|
|
43 |
*/
|
|
44 |
public abstract class AbstractPerfDataBuffer {
|
|
45 |
|
|
46 |
/**
|
|
47 |
* Reference to the concrete instance created by the
|
|
48 |
* {@link #createPerfDataBuffer} method.
|
|
49 |
*/
|
|
50 |
protected PerfDataBufferImpl impl;
|
|
51 |
|
|
52 |
/**
|
|
53 |
* Get the Local Java Virtual Machine Identifier, or <em>lvmid</em>
|
|
54 |
* for the target JVM associated with this instrumentation buffer.
|
|
55 |
*
|
|
56 |
* @return int - the lvmid
|
|
57 |
*/
|
|
58 |
public int getLocalVmId() {
|
|
59 |
return impl.getLocalVmId();
|
|
60 |
}
|
|
61 |
|
|
62 |
/**
|
|
63 |
* Get a copy of the raw instrumentation data.
|
|
64 |
* This method is used to get a copy of the current bytes in the
|
|
65 |
* instrumentation buffer. It is generally used for transporting
|
|
66 |
* those bytes over the network.
|
|
67 |
*
|
|
68 |
* @return byte[] - a copy of the bytes in the instrumentation buffer.
|
|
69 |
*/
|
|
70 |
public byte[] getBytes() {
|
|
71 |
return impl.getBytes();
|
|
72 |
}
|
|
73 |
|
|
74 |
/**
|
|
75 |
* Get the capacity of the instrumentation buffer.
|
|
76 |
*
|
|
77 |
* @return int - the capacity, or size, of the instrumentation buffer.
|
|
78 |
*/
|
|
79 |
public int getCapacity() {
|
|
80 |
return impl.getCapacity();
|
|
81 |
}
|
|
82 |
|
|
83 |
/**
|
|
84 |
* Find a named Instrumentation object.
|
|
85 |
*
|
|
86 |
* This method will look for the named instrumentation object in the
|
|
87 |
* instrumentation exported by this Java Virtual Machine. If an
|
|
88 |
* instrumentation object with the given name exists, a Monitor interface
|
|
89 |
* to that object will be return. Otherwise, the method returns
|
|
90 |
* <tt>null</tt>.
|
|
91 |
*
|
|
92 |
* @param name the name of the Instrumentation object to find.
|
|
93 |
* @return Monitor - the {@link Monitor} object that can be used to
|
|
94 |
* monitor the the named instrumentation object, or
|
|
95 |
* <tt>null</tt> if the named object doesn't exist.
|
|
96 |
* @throws MonitorException Thrown if an error occurs while communicating
|
|
97 |
* with the target Java Virtual Machine.
|
|
98 |
*/
|
|
99 |
public Monitor findByName(String name) throws MonitorException {
|
|
100 |
return impl.findByName(name);
|
|
101 |
}
|
|
102 |
|
|
103 |
/**
|
|
104 |
* Find all Instrumentation objects with names matching the given pattern.
|
|
105 |
*
|
|
106 |
* This method returns a {@link List} of Monitor objects such that
|
|
107 |
* the name of each object matches the given pattern.
|
|
108 |
*
|
|
109 |
* @param patternString a string containing a pattern as described in
|
|
110 |
* {@link java.util.regex.Pattern}.
|
|
111 |
* @return List<Monitor> - a List of {@link Monitor} objects that can be used to
|
|
112 |
* monitor the instrumentation objects whose names match
|
|
113 |
* the given pattern. If no instrumentation objects have`
|
|
114 |
* names matching the given pattern, then an empty List
|
|
115 |
* is returned.
|
|
116 |
* @throws MonitorException Thrown if an error occurs while communicating
|
|
117 |
* with the target Java Virtual Machine.
|
|
118 |
* @see java.util.regex.Pattern
|
|
119 |
*/
|
|
120 |
public List<Monitor> findByPattern(String patternString) throws MonitorException {
|
|
121 |
return impl.findByPattern(patternString);
|
|
122 |
}
|
|
123 |
|
|
124 |
/**
|
|
125 |
* Get a list of the inserted and removed monitors since last called.
|
|
126 |
*
|
|
127 |
* @return MonitorStatus - the status of available Monitors for the
|
|
128 |
* target Java Virtual Machine.
|
|
129 |
* @throws MonitorException Thrown if communications errors occur
|
|
130 |
* while communicating with the target.
|
|
131 |
*/
|
|
132 |
public MonitorStatus getMonitorStatus() throws MonitorException {
|
|
133 |
return impl.getMonitorStatus();
|
|
134 |
}
|
|
135 |
|
|
136 |
/**
|
|
137 |
* Get the ByteBuffer containing the instrumentation data.
|
|
138 |
*
|
|
139 |
* @return ByteBuffer - a ByteBuffer object that refers to the
|
|
140 |
* instrumentation data.
|
|
141 |
*/
|
|
142 |
public ByteBuffer getByteBuffer() {
|
|
143 |
return impl.getByteBuffer();
|
|
144 |
}
|
|
145 |
|
|
146 |
/**
|
|
147 |
* Create the perfdata instrumentation buffer for the given lvmid
|
|
148 |
* using the given ByteBuffer object as the source of the instrumentation
|
|
149 |
* data. This method parses the instrumentation buffer header to determine
|
|
150 |
* key characteristics of the instrumentation buffer and then dynamically
|
|
151 |
* loads the appropriate class to handle the particular instrumentation
|
|
152 |
* version.
|
|
153 |
*
|
|
154 |
* @param bb the ByteBuffer that references the instrumentation data.
|
|
155 |
* @param lvmid the Local Java Virtual Machine identifier for this
|
|
156 |
* instrumentation buffer.
|
|
157 |
*
|
|
158 |
* @throws MonitorException
|
|
159 |
*/
|
|
160 |
protected void createPerfDataBuffer(ByteBuffer bb, int lvmid)
|
|
161 |
throws MonitorException {
|
|
162 |
int majorVersion = AbstractPerfDataBufferPrologue.getMajorVersion(bb);
|
|
163 |
int minorVersion = AbstractPerfDataBufferPrologue.getMinorVersion(bb);
|
|
164 |
|
|
165 |
// instantiate the version specific class
|
|
166 |
String classname = "sun.jvmstat.perfdata.monitor.v"
|
|
167 |
+ majorVersion + "_" + minorVersion
|
|
168 |
+ ".PerfDataBuffer";
|
|
169 |
|
|
170 |
try {
|
|
171 |
Class<?> implClass = Class.forName(classname);
|
|
172 |
Constructor cons = implClass.getConstructor(new Class[] {
|
|
173 |
Class.forName("java.nio.ByteBuffer"),
|
|
174 |
Integer.TYPE
|
|
175 |
});
|
|
176 |
|
|
177 |
impl = (PerfDataBufferImpl)cons.newInstance(new Object[] {
|
|
178 |
bb, new Integer(lvmid)
|
|
179 |
});
|
|
180 |
|
|
181 |
} catch (ClassNotFoundException e) {
|
|
182 |
// from Class.forName();
|
|
183 |
throw new IllegalArgumentException(
|
|
184 |
"Could not find " + classname + ": " + e.getMessage(), e);
|
|
185 |
|
|
186 |
} catch (NoSuchMethodException e) {
|
|
187 |
// from Class.getConstructor();
|
|
188 |
throw new IllegalArgumentException(
|
|
189 |
"Expected constructor missing in " + classname + ": "
|
|
190 |
+ e.getMessage(), e);
|
|
191 |
|
|
192 |
} catch (IllegalAccessException e) {
|
|
193 |
// from Constructor.newInstance()
|
|
194 |
throw new IllegalArgumentException(
|
|
195 |
"Unexpected constructor access in " + classname + ": "
|
|
196 |
+ e.getMessage(), e);
|
|
197 |
|
|
198 |
} catch (InstantiationException e) {
|
|
199 |
throw new IllegalArgumentException(
|
|
200 |
classname + "is abstract: " + e.getMessage(), e);
|
|
201 |
|
|
202 |
} catch (InvocationTargetException e) {
|
|
203 |
Throwable cause = e.getCause();
|
|
204 |
if (cause instanceof MonitorException) {
|
|
205 |
throw (MonitorException)cause;
|
|
206 |
}
|
|
207 |
throw new RuntimeException("Unexpected exception: "
|
|
208 |
+ e.getMessage() , e);
|
|
209 |
}
|
|
210 |
}
|
|
211 |
}
|