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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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package sun.jvmstat.perfdata.monitor.protocol.rmi;

import java.util.*;
import java.util.regex.*;
import java.io.*;
import java.rmi.RemoteException;
import sun.jvmstat.monitor.*;
import sun.jvmstat.monitor.event.*;
import sun.jvmstat.monitor.remote.*;

Class for managing the RemoteMonitoredVm instances on a remote system.

This class is responsible for the mechanism that detects the active
HotSpot Java Virtual Machines on the remote host and possibly for a
specific user. The ability to detect all possible HotSpot Java Virtual
Machines on the remote host may be limited by the permissions of the
principal running the RMI server application on the remote host.
Author:
Brian Doherty
Since:
1.5/**
 * Class for managing the RemoteMonitoredVm instances on a remote system.
 * <p>
 * This class is responsible for the mechanism that detects the active
 * HotSpot Java Virtual Machines on the remote host and possibly for a
 * specific user. The ability to detect all possible HotSpot Java Virtual
 * Machines on the remote host may be limited by the permissions of the
 * principal running the RMI server application on the remote host.
 *
 * @author Brian Doherty
 * @since 1.5
 */
public class RemoteVmManager {

    private RemoteHost remoteHost;
    private String user;

    
Creates a RemoteVmManager instance for the remote system.

Manages RemoteMonitordVm instances for which the principal
running the remote server has appropriate permissions.
Params:
remoteHost – the remote proxy object to the RMI server on
                  the remote system./**
     * Creates a RemoteVmManager instance for the remote system.
     * <p>
     * Manages RemoteMonitordVm instances for which the principal
     * running the remote server has appropriate permissions.
     *
     * @param remoteHost the remote proxy object to the RMI server on
     *                   the remote system.
     */
    public RemoteVmManager(RemoteHost remoteHost) {
        this(remoteHost, null);
    }

    
Creates a RemoteVmManager instance for the given user.

Manages RemoteMonitoredVm instances for all remote Java Virtual
machines owned by the specified user on the remote system. The
RMI server on the remote system must have the appropriate permissions
to access the named users Java Virtual Machines.
Params:
remoteHost – the remote proxy object to the RMI server on
                  the remote system.
user – the name of the user/**
     * Creates a RemoteVmManager instance for the given user.
     * <p>
     * Manages RemoteMonitoredVm instances for all remote Java Virtual
     * machines owned by the specified user on the remote system. The
     * RMI server on the remote system must have the appropriate permissions
     * to access the named users Java Virtual Machines.
     *
     * @param remoteHost the remote proxy object to the RMI server on
     *                   the remote system.
     * @param user the name of the user
     */
    public RemoteVmManager(RemoteHost remoteHost, String user) {
        this.user = user;
        this.remoteHost = remoteHost;
    }

    
Return the current set of monitorable Java Virtual Machines.

The set returned by this method depends on the user name passed
to the constructor. If no user name was specified, then this
method will return all candidate JVMs on the system. Otherwise,
only the JVMs for the given user will be returned. This assumes
that the RMI server process has the appropriate permissions to
access the target set of JVMs.
Returns:
Set - the Set of monitorable Java Virtual Machines/**
     * Return the current set of monitorable Java Virtual Machines.
     * <p>
     * The set returned by this method depends on the user name passed
     * to the constructor. If no user name was specified, then this
     * method will return all candidate JVMs on the system. Otherwise,
     * only the JVMs for the given user will be returned. This assumes
     * that the RMI server process has the appropriate permissions to
     * access the target set of JVMs.
     *
     * @return Set - the Set of monitorable Java Virtual Machines
     */
    public Set<Integer> activeVms() throws MonitorException {
        int[] active = null;

        try {
            active = remoteHost.activeVms();

        } catch (RemoteException e) {
            throw new MonitorException("Error communicating with remote host: "
                                       + e.getMessage(), e);
        }

        Set<Integer> activeSet = new HashSet<Integer>(active.length);

        for (int i = 0; i < active.length; i++) {
            activeSet.add(new Integer(active[i]));
        }

        return activeSet;
    }
}