1 | /** |
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2 | * Licensed to the Apache Software Foundation (ASF) under one |
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3 | * or more contributor license agreements. See the NOTICE file |
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4 | * distributed with this work for additional information |
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5 | * regarding copyright ownership. The ASF licenses this file |
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6 | * to you under the Apache License, Version 2.0 (the |
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7 | * "License"); you may not use this file except in compliance |
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8 | * with the License. You may obtain a copy of the License at |
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9 | * |
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10 | * http://www.apache.org/licenses/LICENSE-2.0 |
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11 | * |
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12 | * Unless required by applicable law or agreed to in writing, software |
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13 | * distributed under the License is distributed on an "AS IS" BASIS, |
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14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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15 | * See the License for the specific language governing permissions and |
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16 | * limitations under the License. |
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17 | */ |
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18 | package org.apache.hadoop.metrics.util; |
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19 | |
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20 | import java.lang.management.ManagementFactory; |
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21 | |
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22 | import javax.management.InstanceNotFoundException; |
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23 | import javax.management.MBeanServer; |
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24 | import javax.management.MalformedObjectNameException; |
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25 | import javax.management.ObjectName; |
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26 | import javax.management.InstanceAlreadyExistsException; |
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27 | |
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28 | |
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29 | /** |
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30 | * This util class provides a method to register an MBean using |
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31 | * our standard naming convention as described in the doc |
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32 | * for {link {@link #registerMBean(String, String, Object)} |
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33 | * |
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34 | */ |
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35 | public class MBeanUtil { |
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36 | |
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37 | /** |
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38 | * Register the MBean using our standard MBeanName format |
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39 | * "hadoop:service=<serviceName>,name=<nameName>" |
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40 | * Where the <serviceName> and <nameName> are the supplied parameters |
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41 | * |
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42 | * @param serviceName |
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43 | * @param nameName |
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44 | * @param theMbean - the MBean to register |
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45 | * @return the named used to register the MBean |
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46 | */ |
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47 | static public ObjectName registerMBean(final String serviceName, |
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48 | final String nameName, |
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49 | final Object theMbean) { |
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50 | final MBeanServer mbs = ManagementFactory.getPlatformMBeanServer(); |
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51 | ObjectName name = getMBeanName(serviceName, nameName); |
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52 | try { |
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53 | mbs.registerMBean(theMbean, name); |
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54 | return name; |
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55 | } catch (InstanceAlreadyExistsException ie) { |
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56 | // Ignore if instance already exists |
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57 | } catch (Exception e) { |
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58 | e.printStackTrace(); |
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59 | } |
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60 | return null; |
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61 | } |
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62 | |
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63 | static public void unregisterMBean(ObjectName mbeanName) { |
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64 | final MBeanServer mbs = ManagementFactory.getPlatformMBeanServer(); |
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65 | if (mbeanName == null) |
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66 | return; |
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67 | try { |
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68 | mbs.unregisterMBean(mbeanName); |
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69 | } catch (InstanceNotFoundException e ) { |
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70 | // ignore |
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71 | } catch (Exception e) { |
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72 | e.printStackTrace(); |
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73 | } |
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74 | } |
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75 | |
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76 | static private ObjectName getMBeanName(final String serviceName, |
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77 | final String nameName) { |
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78 | ObjectName name = null; |
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79 | try { |
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80 | name = new ObjectName("hadoop:" + |
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81 | "service=" + serviceName + ",name=" + nameName); |
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82 | } catch (MalformedObjectNameException e) { |
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83 | e.printStackTrace(); |
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84 | } |
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85 | return name; |
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86 | } |
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87 | } |
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