J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2005-2006 Sun Microsystems, Inc. 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. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | package com.sun.jmx.mbeanserver; |
| 27 | |
| 28 | import static com.sun.jmx.mbeanserver.Util.*; |
| 29 | |
| 30 | import java.lang.reflect.InvocationHandler; |
| 31 | import java.lang.reflect.Method; |
| 32 | import java.util.Map; |
| 33 | |
| 34 | import javax.management.Attribute; |
| 35 | import javax.management.MBeanServerConnection; |
| 36 | import javax.management.NotCompliantMBeanException; |
| 37 | import javax.management.ObjectName; |
| 38 | |
| 39 | /** |
| 40 | <p>Helper class for an {@link InvocationHandler} that forwards methods from an |
| 41 | MXBean interface to a named |
| 42 | MXBean in an MBean Server and handles translation between the |
| 43 | arbitrary Java types in the interface and the Open Types used |
| 44 | by the MXBean.</p> |
| 45 | |
| 46 | @since 1.6 |
| 47 | */ |
| 48 | public class MXBeanProxy { |
| 49 | public MXBeanProxy(Class<?> mxbeanInterface) |
| 50 | throws IllegalArgumentException { |
| 51 | |
| 52 | if (mxbeanInterface == null) |
| 53 | throw new IllegalArgumentException("Null parameter"); |
| 54 | |
| 55 | final MBeanAnalyzer<ConvertingMethod> analyzer; |
| 56 | try { |
| 57 | analyzer = |
| 58 | MXBeanIntrospector.getInstance().getAnalyzer(mxbeanInterface); |
| 59 | } catch (NotCompliantMBeanException e) { |
| 60 | throw new IllegalArgumentException(e); |
| 61 | } |
| 62 | analyzer.visit(new Visitor()); |
| 63 | } |
| 64 | |
| 65 | private class Visitor implements MBeanAnalyzer.MBeanVisitor<ConvertingMethod> { |
| 66 | public void visitAttribute(String attributeName, |
| 67 | ConvertingMethod getter, |
| 68 | ConvertingMethod setter) { |
| 69 | if (getter != null) { |
| 70 | getter.checkCallToOpen(); |
| 71 | Method getterMethod = getter.getMethod(); |
| 72 | handlerMap.put(getterMethod, |
| 73 | new GetHandler(attributeName, getter)); |
| 74 | } |
| 75 | if (setter != null) { |
| 76 | // return type is void, no need for checkCallToOpen |
| 77 | Method setterMethod = setter.getMethod(); |
| 78 | handlerMap.put(setterMethod, |
| 79 | new SetHandler(attributeName, setter)); |
| 80 | } |
| 81 | } |
| 82 | |
| 83 | public void visitOperation(String operationName, |
| 84 | ConvertingMethod operation) { |
| 85 | operation.checkCallToOpen(); |
| 86 | Method operationMethod = operation.getMethod(); |
| 87 | String[] sig = operation.getOpenSignature(); |
| 88 | handlerMap.put(operationMethod, |
| 89 | new InvokeHandler(operationName, sig, operation)); |
| 90 | } |
| 91 | } |
| 92 | |
| 93 | private static abstract class Handler { |
| 94 | Handler(String name, ConvertingMethod cm) { |
| 95 | this.name = name; |
| 96 | this.convertingMethod = cm; |
| 97 | } |
| 98 | |
| 99 | String getName() { |
| 100 | return name; |
| 101 | } |
| 102 | |
| 103 | ConvertingMethod getConvertingMethod() { |
| 104 | return convertingMethod; |
| 105 | } |
| 106 | |
| 107 | abstract Object invoke(MBeanServerConnection mbsc, |
| 108 | ObjectName name, Object[] args) throws Exception; |
| 109 | |
| 110 | private final String name; |
| 111 | private final ConvertingMethod convertingMethod; |
| 112 | } |
| 113 | |
| 114 | private static class GetHandler extends Handler { |
| 115 | GetHandler(String attributeName, ConvertingMethod cm) { |
| 116 | super(attributeName, cm); |
| 117 | } |
| 118 | |
| 119 | @Override |
| 120 | Object invoke(MBeanServerConnection mbsc, ObjectName name, Object[] args) |
| 121 | throws Exception { |
| 122 | assert(args == null || args.length == 0); |
| 123 | return mbsc.getAttribute(name, getName()); |
| 124 | } |
| 125 | } |
| 126 | |
| 127 | private static class SetHandler extends Handler { |
| 128 | SetHandler(String attributeName, ConvertingMethod cm) { |
| 129 | super(attributeName, cm); |
| 130 | } |
| 131 | |
| 132 | @Override |
| 133 | Object invoke(MBeanServerConnection mbsc, ObjectName name, Object[] args) |
| 134 | throws Exception { |
| 135 | assert(args.length == 1); |
| 136 | Attribute attr = new Attribute(getName(), args[0]); |
| 137 | mbsc.setAttribute(name, attr); |
| 138 | return null; |
| 139 | } |
| 140 | } |
| 141 | |
| 142 | private static class InvokeHandler extends Handler { |
| 143 | InvokeHandler(String operationName, String[] signature, |
| 144 | ConvertingMethod cm) { |
| 145 | super(operationName, cm); |
| 146 | this.signature = signature; |
| 147 | } |
| 148 | |
| 149 | Object invoke(MBeanServerConnection mbsc, ObjectName name, Object[] args) |
| 150 | throws Exception { |
| 151 | return mbsc.invoke(name, getName(), args, signature); |
| 152 | } |
| 153 | |
| 154 | private final String[] signature; |
| 155 | } |
| 156 | |
| 157 | public Object invoke(MBeanServerConnection mbsc, ObjectName name, |
| 158 | Method method, Object[] args) |
| 159 | throws Throwable { |
| 160 | |
| 161 | Handler handler = handlerMap.get(method); |
| 162 | ConvertingMethod cm = handler.getConvertingMethod(); |
| 163 | MXBeanLookup lookup = MXBeanLookup.lookupFor(mbsc); |
| 164 | Object[] openArgs = cm.toOpenParameters(lookup, args); |
| 165 | Object result = handler.invoke(mbsc, name, openArgs); |
| 166 | return cm.fromOpenReturnValue(lookup, result); |
| 167 | } |
| 168 | |
| 169 | private final Map<Method, Handler> handlerMap = newMap(); |
| 170 | } |