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 // XXX TODO
  38 //import sun.management.spi.PlatformMBeanProvider;
  39 
  40 public final class FlightRecorderMXBeanProvider /*extends PlatformMBeanProvider */{
  41 
  42     private final static class SingleMBeanComponent
  43             /*implements PlatformComponent<FlightRecorderMXBean>*/ {
  44         private final String objectName;
  45         private final Class<FlightRecorderMXBean> mbeanInterface;
  46 
  47         public SingleMBeanComponent(String objectName,
  48                                     Class<FlightRecorderMXBean> mbeanInterface) {
  49             this.objectName = objectName;
  50             this.mbeanInterface = mbeanInterface;
  51         }
  52 
  53 //        @Override
  54 //        public Set<String> mbeanInterfaceNames() {
  55 //            return Collections.singleton(mbeanInterface.getName());
  56 //        }
  57 //
  58 //        @Override
  59 //        public Map<String, FlightRecorderMXBean> nameToMBeanMap() {
  60 //            FlightRecorderMXBean bean = getFlightRecorderMXBean();
  61 //            if (bean != null) {
  62 //                return Collections.singletonMap(objectName, bean);
  63 //            } else {
  64 //                return Collections.emptyMap();
  65 //            }
  66 //        }
  67 //
  68 //        @Override
  69 //        public String getObjectNamePattern() {
  70 //            return objectName;
  71 //        }
  72 //
  73 //        @Override
  74 //        public Set<Class<? extends FlightRecorderMXBean>> mbeanInterfaces() {
  75 //            return Collections.singleton(mbeanInterface);
  76 //        }
  77     }
  78 
  79     private static Callable<FlightRecorderMXBean> flightRecorderMXBeanFactory;
  80 
  81     private static volatile FlightRecorderMXBean flightRecorderMXBean;
  82 
  83     public static FlightRecorderMXBean getFlightRecorderMXBean() {
  84         FlightRecorderMXBean bean = flightRecorderMXBean;
  85         if (bean == null) {
  86             SettingDescriptorInfo.from(null); // Sets flightRecorderMXBeanFactory under <clinit> lock
  87             synchronized (flightRecorderMXBeanFactory) {
  88                 bean = flightRecorderMXBean;
  89                 if (bean != null) {
  90                     return bean;
  91                 }
  92                 try {
  93                     bean = flightRecorderMXBean = flightRecorderMXBeanFactory.call();
  94                 } catch (Exception e) {
  95                     ManagementSupport.logError("Could not create Flight Recorder "
  96                             + "instance for MBeanServer. " + e.getMessage());
  97                 }
  98             }
  99         }
 100         return bean;
 101     }
 102 
 103     public static void setFlightRecorderMXBeanFactory(Callable<FlightRecorderMXBean> factory) {
 104         flightRecorderMXBeanFactory = factory;
 105     }
 106 
 107 //    @Override
 108 //    public List<PlatformComponent<?>> getPlatformComponentList() {
 109 //        String objectName = FlightRecorderMXBean.MXBEAN_NAME;
 110 //        Class<FlightRecorderMXBean> mbeanInterface = FlightRecorderMXBean.class;
 111 //        return Collections.singletonList(new SingleMBeanComponent(objectName, mbeanInterface));
 112 //    }
 113 }