Java example source code file (MonitoredHostProvider.java)

This example Java source code file (MonitoredHostProvider.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

default_polling_interval, filemonitoredvm, hashset, monitoredhostprovider, monitoredvm, monitorexception, net, network, util

The MonitoredHostProvider.java Java example source code

/*
 * 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
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

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: 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: 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: protocol silently ignores the
     * <tt>interval 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: 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: 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: 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);
    }
}