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package sun.tools.jstatd;

import java.util.*;
import java.nio.*;
import java.io.*;
import java.net.*;
import java.rmi.*;
import java.rmi.server.*;
import sun.jvmstat.monitor.*;
import sun.jvmstat.monitor.event.*;
import sun.jvmstat.monitor.remote.*;

Concrete implementation of the RemoteHost interface for the HotSpot PerfData rmi: protocol.

This class provides remote access to the instrumentation exported by HotSpot Java Virtual Machines through the PerfData shared memory interface.

Author:Brian Doherty
Since:1.5
/** * Concrete implementation of the RemoteHost interface for the HotSpot * PerfData <em>rmi:</em> protocol. * <p> * This class provides remote access to the instrumentation exported * by HotSpot Java Virtual Machines through the PerfData shared memory * interface. * * @author Brian Doherty * @since 1.5 */
public class RemoteHostImpl implements RemoteHost, HostListener { private MonitoredHost monitoredHost; private Set<Integer> activeVms; public RemoteHostImpl() throws MonitorException { try { monitoredHost = MonitoredHost.getMonitoredHost("localhost"); } catch (URISyntaxException e) { } activeVms = monitoredHost.activeVms(); monitoredHost.addHostListener(this); } public RemoteVm attachVm(int lvmid, String mode) throws RemoteException, MonitorException { Integer v = new Integer(lvmid); RemoteVm stub = null; StringBuffer sb = new StringBuffer(); sb.append("local://").append(lvmid).append("@localhost"); if (mode != null) { sb.append("?mode=" + mode); } String vmidStr = sb.toString(); try { VmIdentifier vmid = new VmIdentifier(vmidStr); MonitoredVm mvm = monitoredHost.getMonitoredVm(vmid); RemoteVmImpl rvm = new RemoteVmImpl((BufferedMonitoredVm)mvm); stub = (RemoteVm) UnicastRemoteObject.exportObject(rvm, 0); } catch (URISyntaxException e) { throw new RuntimeException("Malformed VmIdentifier URI: " + vmidStr, e); } return stub; } public void detachVm(RemoteVm rvm) throws RemoteException { rvm.detach(); } public int[] activeVms() throws MonitorException { Object[] vms = null; int[] vmids = null; vms = monitoredHost.activeVms().toArray(); vmids = new int[vms.length]; for (int i = 0; i < vmids.length; i++) { vmids[i] = ((Integer)vms[i]).intValue(); } return vmids; } public void vmStatusChanged(VmStatusChangeEvent ev) { synchronized(this.activeVms) { activeVms.retainAll(ev.getActive()); } } public void disconnected(HostEvent ev) { // we only monitor the local host, so this event shouldn't occur. } }