1 /* 2 * Copyright (c) 2016, 2018, 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 jdk.management.jfr.internal; 27 28 import java.util.Collections; 29 import java.util.List; 30 import java.util.Map; 31 import java.util.Set; 32 import java.util.concurrent.Callable; 33 34 import jdk.jfr.internal.management.ManagementSupport; 35 import jdk.management.jfr.FlightRecorderMXBean; 36 import jdk.management.jfr.SettingDescriptorInfo; 37 import sun.management.spi.PlatformMBeanProvider; 38 39 public final class FlightRecorderMXBeanProvider extends PlatformMBeanProvider { 40 41 private final static class SingleMBeanComponent 42 implements PlatformComponent<FlightRecorderMXBean> { 43 private final String objectName; 44 private final Class<FlightRecorderMXBean> mbeanInterface; 45 46 public SingleMBeanComponent(String objectName, 47 Class<FlightRecorderMXBean> mbeanInterface) { 48 this.objectName = objectName; 49 this.mbeanInterface = mbeanInterface; 50 } 51 52 @Override 53 public Set<String> mbeanInterfaceNames() { 54 return Collections.singleton(mbeanInterface.getName()); 55 } 56 57 @Override 58 public Map<String, FlightRecorderMXBean> nameToMBeanMap() { 59 FlightRecorderMXBean bean = getFlightRecorderMXBean(); 60 if (bean != null) { 61 return Collections.singletonMap(objectName, bean); 62 } else { 63 return Collections.emptyMap(); 64 } 65 } 66 67 @Override 68 public String getObjectNamePattern() { 69 return objectName; 70 } 71 72 @Override 73 public Set<Class<? extends FlightRecorderMXBean>> mbeanInterfaces() { 74 return Collections.singleton(mbeanInterface); 75 } 76 } 77 78 private static Callable<FlightRecorderMXBean> flightRecorderMXBeanFactory; 79 80 private static volatile FlightRecorderMXBean flightRecorderMXBean; 81 82 private static FlightRecorderMXBean getFlightRecorderMXBean() { 83 FlightRecorderMXBean bean = flightRecorderMXBean; 84 if (bean == null) { 85 SettingDescriptorInfo.from(null); // Sets flightRecorderMXBeanFactory under <clinit> lock 86 synchronized (flightRecorderMXBeanFactory) { 87 bean = flightRecorderMXBean; 88 if (bean != null) { 89 return bean; 90 } 91 try { 92 bean = flightRecorderMXBean = flightRecorderMXBeanFactory.call(); 93 } catch (Exception e) { 94 ManagementSupport.logError("Could not create Flight Recorder " 95 + "instance for MBeanServer. " + e.getMessage()); 96 } 97 } 98 } 99 return bean; 100 } 101 102 public static void setFlightRecorderMXBeanFactory(Callable<FlightRecorderMXBean> factory) { 103 flightRecorderMXBeanFactory = factory; 104 } 105 106 @Override 107 public List<PlatformComponent<?>> getPlatformComponentList() { 108 String objectName = FlightRecorderMXBean.MXBEAN_NAME; 109 Class<FlightRecorderMXBean> mbeanInterface = FlightRecorderMXBean.class; 110 return Collections.singletonList(new SingleMBeanComponent(objectName, mbeanInterface)); 111 } 112 }