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 26package sun.jvmstat.perfdata.monitor.protocol.rmi; 27 28import java.util.*; 29import java.util.regex.*; 30import java.io.*; 31import java.rmi.RemoteException; 32import sun.jvmstat.monitor.*; 33import sun.jvmstat.monitor.event.*; 34import sun.jvmstat.monitor.remote.*; 35 36/** 37 * Class for managing the RemoteMonitoredVm instances on a remote system. 38 * <p> 39 * This class is responsible for the mechanism that detects the active 40 * HotSpot Java Virtual Machines on the remote host and possibly for a 41 * specific user. The ability to detect all possible HotSpot Java Virtual 42 * Machines on the remote host may be limited by the permissions of the 43 * principal running the RMI server application on the remote host. 44 * 45 * @author Brian Doherty 46 * @since 1.5 47 */ 48public class RemoteVmManager { 49 50 private RemoteHost remoteHost; 51 private String user; 52 53 /** 54 * Creates a RemoteVmManager instance for the remote system. 55 * <p> 56 * Manages RemoteMonitordVm instances for which the principal 57 * running the remote server has appropriate permissions. 58 * 59 * @param remoteHost the remote proxy object to the RMI server on 60 * the remote system. 61 */ 62 public RemoteVmManager(RemoteHost remoteHost) { 63 this(remoteHost, null); 64 } 65 66 /** 67 * Creates a RemoteVmManager instance for the given user. 68 * <p> 69 * Manages RemoteMonitoredVm instances for all remote Java Virtual 70 * machines owned by the specified user on the remote system. The 71 * RMI server on the remote system must have the appropriate permissions 72 * to access the named users Java Virtual Machines. 73 * 74 * @param remoteHost the remote proxy object to the RMI server on 75 * the remote system. 76 * @param user the name of the user 77 */ 78 public RemoteVmManager(RemoteHost remoteHost, String user) { 79 this.user = user; 80 this.remoteHost = remoteHost; 81 } 82 83 /** 84 * Return the current set of monitorable Java Virtual Machines. 85 * <p> 86 * The set returned by this method depends on the user name passed 87 * to the constructor. If no user name was specified, then this 88 * method will return all candidate JVMs on the system. Otherwise, 89 * only the JVMs for the given user will be returned. This assumes 90 * that the RMI server process has the appropriate permissions to 91 * access the target set of JVMs. 92 * 93 * @return Set - the Set of monitorable Java Virtual Machines 94 */ 95 public Set<Integer> activeVms() throws MonitorException { 96 int[] active = null; 97 98 try { 99 active = remoteHost.activeVms(); 100 101 } catch (RemoteException e) { 102 throw new MonitorException("Error communicating with remote host: " 103 + e.getMessage(), e); 104 } 105 106 Set<Integer> activeSet = new HashSet<Integer>(active.length); 107 108 for (int i = 0; i < active.length; i++) { 109 activeSet.add(active[i]); 110 } 111 112 return activeSet; 113 } 114} 115