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.tools.jstatd;

    27 

    28 import java.util.*;

    29 import java.nio.*;

    30 import java.io.*;

    31 import java.net.*;

    32 import java.rmi.*;

    33 import java.rmi.server.*;

    34 import sun.jvmstat.monitor.*;

    35 import sun.jvmstat.monitor.event.*;

    36 import sun.jvmstat.monitor.remote.*;

    37 

    38 /**

    39  * Concrete implementation of the RemoteHost interface for the HotSpot

    40  * PerfData <em>rmi:</em> protocol.

    41  * <p>

    42  * This class provides remote access to the instrumentation exported

    43  * by HotSpot Java Virtual Machines through the PerfData shared memory

    44  * interface.

    45  *

    46  * @author Brian Doherty

    47  * @since 1.5

    48  */

    49 public class RemoteHostImpl implements RemoteHost, HostListener {

    50 

    51     private MonitoredHost monitoredHost;

    52     private Set<Integer> activeVms;

    53 

    54     public RemoteHostImpl() throws MonitorException {

    55         try {

    56             monitoredHost = MonitoredHost.getMonitoredHost("localhost");

    57         } catch (URISyntaxException e) { }

    58 

    59         activeVms = monitoredHost.activeVms();

    60         monitoredHost.addHostListener(this);

    61     }

    62 

    63     public RemoteVm attachVm(int lvmid, String mode)

    64                     throws RemoteException, MonitorException {

    65         Integer v = lvmid;

    66         RemoteVm stub = null;

    67         StringBuilder sb = new StringBuilder();

    68 

    69         sb.append("local://").append(lvmid).append("@localhost");

    70         if (mode != null) {

    71             sb.append("?mode=").append(mode);

    72         }

    73 

    74         String vmidStr = sb.toString();

    75 

    76         try {

    77             VmIdentifier vmid = new VmIdentifier(vmidStr);

    78             MonitoredVm mvm = monitoredHost.getMonitoredVm(vmid);

    79             RemoteVmImpl rvm = new RemoteVmImpl((BufferedMonitoredVm)mvm);

    80             stub = (RemoteVm) UnicastRemoteObject.exportObject(rvm, 0);

    81         }

    82         catch (URISyntaxException e) {

    83             throw new RuntimeException("Malformed VmIdentifier URI: "

    84                                        + vmidStr, e);

    85         }

    86         return stub;

    87     }

    88 

    89     public void detachVm(RemoteVm rvm) throws RemoteException {

    90         rvm.detach();

    91     }

    92 

    93     public int[] activeVms() throws MonitorException {

    94         Object[] vms = null;

    95         int[] vmids = null;

    96 

    97         vms = monitoredHost.activeVms().toArray();

    98         vmids = new int[vms.length];

    99 

   100         for (int i = 0; i < vmids.length; i++) {

   101             vmids[i] = ((Integer)vms[i]).intValue();

   102         }

   103         return vmids;

   104     }

   105 

   106     public void vmStatusChanged(VmStatusChangeEvent ev) {

   107         synchronized(this.activeVms) {

   108             activeVms.retainAll(ev.getActive());

   109         }

   110     }

   111 

   112     public void disconnected(HostEvent ev) {

   113         // we only monitor the local host, so this event shouldn't occur.

   114     }

   115 }