1 /* |
|
2 * Copyright (c) 2004, Oracle and/or its affiliates. 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. Oracle designates this |
|
8 * particular file as subject to the "Classpath" exception as provided |
|
9 * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
|
22 * or visit www.oracle.com if you need additional information or have any |
|
23 * questions. |
|
24 */ |
|
25 |
|
26 package sun.jvmstat.perfdata.monitor.protocol.rmi; |
|
27 |
|
28 import sun.jvmstat.monitor.*; |
|
29 import sun.jvmstat.monitor.remote.*; |
|
30 import sun.jvmstat.perfdata.monitor.*; |
|
31 import java.io.*; |
|
32 import java.rmi.RemoteException; |
|
33 import java.nio.ByteBuffer; |
|
34 |
|
35 /** |
|
36 * The concrete PerfDataBuffer implementation for the <em>rmi:</em> |
|
37 * protocol for the HotSpot PerfData monitoring implementation. |
|
38 * <p> |
|
39 * This class is responsible for acquiring the instrumentation buffer |
|
40 * data for a remote target HotSpot Java Virtual Machine. |
|
41 * |
|
42 * @author Brian Doherty |
|
43 * @since 1.5 |
|
44 */ |
|
45 public class PerfDataBuffer extends AbstractPerfDataBuffer { |
|
46 |
|
47 private RemoteVm rvm; |
|
48 |
|
49 /** |
|
50 * Create a PerfDataBuffer instance for accessing the specified |
|
51 * instrumentation buffer. |
|
52 * |
|
53 * @param rvm the proxy to the remote MonitredVm object |
|
54 * @param lvmid the local Java Virtual Machine Identifier of the |
|
55 * remote target. |
|
56 * |
|
57 * @throws MonitorException |
|
58 */ |
|
59 public PerfDataBuffer(RemoteVm rvm, int lvmid) throws MonitorException { |
|
60 |
|
61 this.rvm = rvm; |
|
62 try { |
|
63 ByteBuffer buffer = ByteBuffer.allocate(rvm.getCapacity()); |
|
64 sample(buffer); |
|
65 createPerfDataBuffer(buffer, lvmid); |
|
66 |
|
67 } catch (RemoteException e) { |
|
68 throw new MonitorException("Could not read data for remote JVM " |
|
69 + lvmid, e); |
|
70 } |
|
71 } |
|
72 |
|
73 /** |
|
74 * Get a copy of the remote instrumentation buffer. |
|
75 *<p> |
|
76 * The data in the remote instrumentation buffer is copied into |
|
77 * the local byte buffer. |
|
78 * |
|
79 * @param buffer the buffer to receive the copy of the remote |
|
80 * instrumentation buffer. |
|
81 * @throws RemoteException Thrown on any communications errors with |
|
82 * the remote system. |
|
83 */ |
|
84 public void sample(ByteBuffer buffer) throws RemoteException { |
|
85 assert buffer != null; |
|
86 assert rvm != null; |
|
87 synchronized(buffer) { |
|
88 buffer.clear(); |
|
89 buffer.put(rvm.getBytes()); |
|
90 } |
|
91 } |
|
92 } |
|