/*

 * Copyright (c) 2004, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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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 <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 = lvmid;

        RemoteVm stub = null;

        StringBuilder sb = new StringBuilder();

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

        if (mode != null) {

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

    }

}