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/*
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* Copyright (c) 2005, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package com.sun.jmx.mbeanserver;
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import java.lang.reflect.InvocationTargetException;
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import java.lang.reflect.Method;
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import java.lang.reflect.Type;
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import java.util.WeakHashMap;
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import javax.management.Descriptor;
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import javax.management.ImmutableDescriptor;
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import javax.management.IntrospectionException;
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import javax.management.MBeanAttributeInfo;
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import javax.management.MBeanException;
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import javax.management.MBeanOperationInfo;
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import javax.management.NotCompliantMBeanException;
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import javax.management.NotificationBroadcaster;
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import javax.management.NotificationBroadcasterSupport;
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import sun.reflect.misc.MethodUtil;
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/**
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* @since 1.6
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*/
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class StandardMBeanIntrospector extends MBeanIntrospector<Method> {
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private static final StandardMBeanIntrospector instance =
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new StandardMBeanIntrospector();
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static StandardMBeanIntrospector getInstance() {
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return instance;
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}
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@Override
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PerInterfaceMap<Method> getPerInterfaceMap() {
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return perInterfaceMap;
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}
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@Override
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MBeanInfoMap getMBeanInfoMap() {
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return mbeanInfoMap;
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}
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@Override
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MBeanAnalyzer<Method> getAnalyzer(Class<?> mbeanInterface)
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throws NotCompliantMBeanException {
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return MBeanAnalyzer.analyzer(mbeanInterface, this);
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}
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@Override
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boolean isMXBean() {
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return false;
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}
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@Override
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Method mFrom(Method m) {
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return m;
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}
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@Override
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String getName(Method m) {
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return m.getName();
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}
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@Override
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Type getGenericReturnType(Method m) {
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return m.getGenericReturnType();
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}
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@Override
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Type[] getGenericParameterTypes(Method m) {
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return m.getGenericParameterTypes();
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}
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@Override
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String[] getSignature(Method m) {
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Class<?>[] params = m.getParameterTypes();
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String[] sig = new String[params.length];
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for (int i = 0; i < params.length; i++)
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sig[i] = params[i].getName();
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return sig;
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}
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@Override
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void checkMethod(Method m) {
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}
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@Override
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Object invokeM2(Method m, Object target, Object[] args, Object cookie)
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throws InvocationTargetException, IllegalAccessException,
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MBeanException {
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return MethodUtil.invoke(m, target, args);
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}
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@Override
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boolean validParameter(Method m, Object value, int paramNo, Object cookie) {
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return isValidParameter(m, value, paramNo);
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}
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@Override
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MBeanAttributeInfo getMBeanAttributeInfo(String attributeName,
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Method getter, Method setter) {
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final String description = "Attribute exposed for management";
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try {
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return new MBeanAttributeInfo(attributeName, description,
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getter, setter);
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} catch (IntrospectionException e) {
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throw new RuntimeException(e); // should not happen
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}
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}
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@Override
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MBeanOperationInfo getMBeanOperationInfo(String operationName,
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Method operation) {
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final String description = "Operation exposed for management";
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return new MBeanOperationInfo(description, operation);
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}
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@Override
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Descriptor getBasicMBeanDescriptor() {
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/* We don't bother saying mxbean=false, and we can't know whether
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the info is immutable until we know whether the MBean class
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(not interface) is a NotificationBroadcaster. */
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return ImmutableDescriptor.EMPTY_DESCRIPTOR;
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}
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@Override
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Descriptor getMBeanDescriptor(Class<?> resourceClass) {
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boolean immutable = isDefinitelyImmutableInfo(resourceClass);
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return new ImmutableDescriptor("mxbean=false",
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"immutableInfo=" + immutable);
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}
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/* Return true if and only if we can be sure that the given MBean implementation
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* class has immutable MBeanInfo. A Standard MBean that is a
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* NotificationBroadcaster is allowed to return different values at
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* different times from its getNotificationInfo() method, which is when
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* we might not know if it is immutable. But if it is a subclass of
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* NotificationBroadcasterSupport and does not override
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* getNotificationInfo(), then we know it won't change.
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*/
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static boolean isDefinitelyImmutableInfo(Class<?> implClass) {
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if (!NotificationBroadcaster.class.isAssignableFrom(implClass))
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return true;
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synchronized (definitelyImmutable) {
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Boolean immutable = definitelyImmutable.get(implClass);
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if (immutable == null) {
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final Class<NotificationBroadcasterSupport> nbs =
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NotificationBroadcasterSupport.class;
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if (nbs.isAssignableFrom(implClass)) {
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try {
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Method m = implClass.getMethod("getNotificationInfo");
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immutable = (m.getDeclaringClass() == nbs);
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} catch (Exception e) {
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// Too bad, we'll say no for now.
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return false;
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}
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} else
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immutable = false;
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definitelyImmutable.put(implClass, immutable);
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}
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return immutable;
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}
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}
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private static final WeakHashMap<Class<?>, Boolean> definitelyImmutable =
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new WeakHashMap<Class<?>, Boolean>();
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private static final PerInterfaceMap<Method>
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perInterfaceMap = new PerInterfaceMap<Method>();
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private static final MBeanInfoMap mbeanInfoMap = new MBeanInfoMap();
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}
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