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=" + 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 }