J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 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.management; |
| 27 | |
| 28 | import java.nio.ByteBuffer; |
| 29 | import java.util.ArrayList; |
| 30 | import java.util.List; |
| 31 | import java.util.Iterator; |
| 32 | import java.util.Set; |
| 33 | import java.io.IOException; |
| 34 | |
| 35 | import sun.misc.Perf; |
| 36 | import sun.management.counter.Units; |
| 37 | import sun.management.counter.Counter; |
| 38 | import sun.management.counter.perf.PerfInstrumentation; |
| 39 | |
| 40 | /** |
| 41 | * A utility class to support the exporting and importing of the address |
| 42 | * of a connector server using the instrumentation buffer. |
| 43 | * |
| 44 | * @since 1.5 |
| 45 | */ |
| 46 | public class ConnectorAddressLink { |
| 47 | |
| 48 | private static final String CONNECTOR_ADDRESS_COUNTER = |
| 49 | "sun.management.JMXConnectorServer.address"; |
| 50 | |
| 51 | /** |
| 52 | * Exports the specified connector address to the instrumentation buffer |
| 53 | * so that it can be read by this or other Java virtual machines running |
| 54 | * on the same system. |
| 55 | * |
| 56 | * @param address The connector address. |
| 57 | */ |
| 58 | public static void export(String address) { |
| 59 | if (address == null || address.length() == 0) { |
| 60 | throw new IllegalArgumentException("address not specified"); |
| 61 | } |
| 62 | Perf perf = Perf.getPerf(); |
| 63 | perf.createString(CONNECTOR_ADDRESS_COUNTER, 1, Units.STRING.intValue(), address); |
| 64 | } |
| 65 | |
| 66 | /** |
| 67 | * Imports the connector address from the instrument buffer |
| 68 | * of the specified Java virtual machine. |
| 69 | * |
| 70 | * @param vmid an identifier that uniquely identifies a local |
| 71 | * Java virtual machine, or <code>0</code> to indicate |
| 72 | * the current Java virtual machine. |
| 73 | * |
| 74 | * @return the value of the connector address, or <code>null</code> |
| 75 | * if the target VM has not exported a connector address. |
| 76 | * |
| 77 | * @throws IOException An I/O error occurred while trying to acquire |
| 78 | * the instrumentation buffer. |
| 79 | */ |
| 80 | public static String importFrom(int vmid) throws IOException { |
| 81 | Perf perf = Perf.getPerf(); |
| 82 | ByteBuffer bb; |
| 83 | try { |
| 84 | bb = perf.attach(vmid, "r"); |
| 85 | } catch (IllegalArgumentException iae) { |
| 86 | throw new IOException(iae.getMessage()); |
| 87 | } |
| 88 | List counters = (new PerfInstrumentation(bb)).findByPattern(CONNECTOR_ADDRESS_COUNTER); |
| 89 | Iterator i = counters.iterator(); |
| 90 | if (i.hasNext()) { |
| 91 | Counter c = (Counter)i.next(); |
| 92 | return (String)c.getValue(); |
| 93 | } else { |
| 94 | return null; |
| 95 | } |
| 96 | } |
| 97 | |
| 98 | } |