| /* |
| * Copyright 2004 Sun Microsystems, Inc. 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. Sun designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| * CA 95054 USA or visit www.sun.com if you need additional information or |
| * have any questions. |
| */ |
| |
| package sun.management; |
| |
| import java.nio.ByteBuffer; |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.Iterator; |
| import java.util.Set; |
| import java.io.IOException; |
| |
| import sun.misc.Perf; |
| import sun.management.counter.Units; |
| import sun.management.counter.Counter; |
| import sun.management.counter.perf.PerfInstrumentation; |
| |
| /** |
| * A utility class to support the exporting and importing of the address |
| * of a connector server using the instrumentation buffer. |
| * |
| * @since 1.5 |
| */ |
| public class ConnectorAddressLink { |
| |
| private static final String CONNECTOR_ADDRESS_COUNTER = |
| "sun.management.JMXConnectorServer.address"; |
| |
| /** |
| * Exports the specified connector address to the instrumentation buffer |
| * so that it can be read by this or other Java virtual machines running |
| * on the same system. |
| * |
| * @param address The connector address. |
| */ |
| public static void export(String address) { |
| if (address == null || address.length() == 0) { |
| throw new IllegalArgumentException("address not specified"); |
| } |
| Perf perf = Perf.getPerf(); |
| perf.createString(CONNECTOR_ADDRESS_COUNTER, 1, Units.STRING.intValue(), address); |
| } |
| |
| /** |
| * Imports the connector address from the instrument buffer |
| * of the specified Java virtual machine. |
| * |
| * @param vmid an identifier that uniquely identifies a local |
| * Java virtual machine, or <code>0</code> to indicate |
| * the current Java virtual machine. |
| * |
| * @return the value of the connector address, or <code>null</code> |
| * if the target VM has not exported a connector address. |
| * |
| * @throws IOException An I/O error occurred while trying to acquire |
| * the instrumentation buffer. |
| */ |
| public static String importFrom(int vmid) throws IOException { |
| Perf perf = Perf.getPerf(); |
| ByteBuffer bb; |
| try { |
| bb = perf.attach(vmid, "r"); |
| } catch (IllegalArgumentException iae) { |
| throw new IOException(iae.getMessage()); |
| } |
| List counters = (new PerfInstrumentation(bb)).findByPattern(CONNECTOR_ADDRESS_COUNTER); |
| Iterator i = counters.iterator(); |
| if (i.hasNext()) { |
| Counter c = (Counter)i.next(); |
| return (String)c.getValue(); |
| } else { |
| return null; |
| } |
| } |
| |
| } |