/*

 * 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.jvmstat.perfdata.monitor.protocol.file;

import sun.jvmstat.monitor.*;

import sun.jvmstat.monitor.event.HostListener;

import sun.jvmstat.perfdata.monitor.*;

import java.util.*;

import java.net.*;

/**

 * Concrete implementation of the MonitoredHost interface for the

 * <em>file:</em> protocol of the HotSpot PerfData monitoring implementation.

 *

 * @author Brian Doherty

 * @since 1.5

 */

public class MonitoredHostProvider extends MonitoredHost {

    /**

     * The default polling interval. Not used by the <em>file:</em> protocol.

     */

    public static final int DEFAULT_POLLING_INTERVAL = 0;

    /**

     * Create a MonitoredHostProvider instance using the given HostIdentifier.

     *

     * @param hostId the host identifier for this MonitoredHost

     */

    public MonitoredHostProvider(HostIdentifier hostId) {

        this.hostId = hostId;

    }

    /**

     * {@inheritDoc}

     */

    public MonitoredVm getMonitoredVm(VmIdentifier vmid)

                       throws MonitorException {

        return getMonitoredVm(vmid, DEFAULT_POLLING_INTERVAL);

    }

    /**

     * {@inheritDoc}.

     * <p>

     * Note - the <em>file:</em> protocol silently ignores the

     * <tt>interval</tt> parameter.

     */

    public MonitoredVm getMonitoredVm(VmIdentifier vmid, int interval)

                       throws MonitorException {

        // don't attempt to resolve 'file:' based vmid

        return new FileMonitoredVm(vmid, interval);

    }

    /**

     * {@inheritDoc}

     */

    public void detach(MonitoredVm vm) {

        vm.detach();

    }

    /**

     * {@inheritDoc}.

     * <p>

     * Note - the <em>file:</em> protocol currenly does not support

     * registration or notification of event listeners. This method

     * silently ignores the add request.

     */

    public void addHostListener(HostListener listener) {

        // no HostListener support for 'file:' based VmIdentifiers

    }

    /**

     * {@inheritDoc}.

     * <p>

     * Note - the <em>file:</em> protocol currenly does not support

     * registration or notification of event listeners. This method

     * silently ignores the remove request.

     */

    public void removeHostListener(HostListener listener) {

        // no HostListener support for 'file:' based VmIdentifiers

    }

    /**

     * {@inheritDoc}.

     * <p>

     * Note - the <em>file:</em> protocol currently does not support the

     * notion of tracking active or inactive Java Virtual Machines. This

     * method currently returns an empty set.

     */

    public Set<Integer> activeVms() {

        return new HashSet<Integer>(0);

    }

}