1 /* 2 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package sun.management; 27 28 import java.lang.reflect.InvocationTargetException; 29 import java.util.Collection; 30 import java.util.Collections; 31 import java.util.List; 32 import java.lang.management.PlatformManagedObject; 33 import java.lang.reflect.Method; 34 35 /** 36 * Class to allow for an extended set of platform MXBeans 37 */ 38 public final class ExtendedPlatformComponent { 39 private ExtendedPlatformComponent() {} // Don't create any instances 40 41 /** 42 * Get the extended set of platform MXBeans that should be registered in the 43 * platform MBeanServer, or an empty list if there are no such MXBeans. 44 */ 45 public static List<? extends PlatformManagedObject> getMXBeans() { 46 PlatformManagedObject o = getFlightRecorderBean(); 47 if (o != null) { 48 return Collections.singletonList(o); 49 } else { 50 return Collections.emptyList(); 51 } 52 } 53 54 /** 55 * Returns the extended platform MXBean implementing the given 56 * mxbeanInterface, or null if there is no such MXBean. 57 */ 58 public static <T extends PlatformManagedObject> 59 T getMXBean(Class<T> mxbeanInterface) { 60 61 if ("jdk.management.jfr.FlightRecorderMXBean".equals(mxbeanInterface.getName())) { 62 return (T)getFlightRecorderBean(); 63 } 64 return null; 65 } 66 67 private static PlatformManagedObject getFlightRecorderBean() { 68 PlatformManagedObject object = null; 69 try { 70 Class provider = Class.forName("jdk.management.jfr.internal.FlightRecorderMXBeanProvider"); 71 Method m = provider.getDeclaredMethod("getFlightRecorderMXBean"); 72 73 object = (PlatformManagedObject)m.invoke(null); 74 } catch (ClassNotFoundException | NoSuchMethodException | IllegalAccessException | InvocationTargetException e) { 75 // no jfr? 76 } 77 return object; 78 } 79 }