/*

 * Copyright (c) 2014, 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.management;

import java.lang.reflect.InvocationTargetException;

import java.util.Collection;

import java.util.Collections;

import java.util.List;

import java.lang.management.PlatformManagedObject;

import java.lang.reflect.Method;

/**

 * Class to allow for an extended set of platform MXBeans

 */

public final class ExtendedPlatformComponent {

    private ExtendedPlatformComponent() {} // Don't create any instances

    /**

     * Get the extended set of platform MXBeans that should be registered in the

     * platform MBeanServer, or an empty list if there are no such MXBeans.

     */

    public static List<? extends PlatformManagedObject> getMXBeans() {

        PlatformManagedObject o = getFlightRecorderBean();

        if (o != null) {

            return Collections.singletonList(o);

        } else {

            return Collections.emptyList();

        }

    }

    /**

     * Returns the extended platform MXBean implementing the given

     * mxbeanInterface, or null if there is no such MXBean.

     */

    public static <T extends PlatformManagedObject>

            T getMXBean(Class<T> mxbeanInterface) {

        if ("jdk.management.jfr.FlightRecorderMXBean".equals(mxbeanInterface.getName())) {

            return (T)getFlightRecorderBean();

        }

        return null;

    }

    private static PlatformManagedObject getFlightRecorderBean() {

        PlatformManagedObject object = null;

        try {

            Class provider = Class.forName("jdk.management.jfr.internal.FlightRecorderMXBeanProvider");

            Method m = provider.getDeclaredMethod("getFlightRecorderMXBean");

            object =  (PlatformManagedObject)m.invoke(null);

        } catch (ClassNotFoundException | NoSuchMethodException | IllegalAccessException | InvocationTargetException e) {

            // no jfr?

        }

        return object;

    }

}