Source Code Cross Referenced for AttributeDispatcher.java in  » EJB-Server-JBoss-4.2.1 » jmx » org » jboss » mx » interceptor » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » EJB Server JBoss 4.2.1 » jmx » org.jboss.mx.interceptor 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * JBoss, Home of Professional Open Source.
003:         * Copyright 2006, Red Hat Middleware LLC, and individual contributors
004:         * as indicated by the @author tags. See the copyright.txt file in the
005:         * distribution for a full listing of individual contributors.
006:         *
007:         * This is free software; you can redistribute it and/or modify it
008:         * under the terms of the GNU Lesser General Public License as
009:         * published by the Free Software Foundation; either version 2.1 of
010:         * the License, or (at your option) any later version.
011:         *
012:         * This software is distributed in the hope that it will be useful,
013:         * but WITHOUT ANY WARRANTY; without even the implied warranty of
014:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
015:         * Lesser General Public License for more details.
016:         *
017:         * You should have received a copy of the GNU Lesser General Public
018:         * License along with this software; if not, write to the Free
019:         * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
020:         * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
021:         */
022:        package org.jboss.mx.interceptor;
023:
024:        import java.lang.reflect.Method;
025:
026:        import javax.management.Descriptor;
027:        import javax.management.InvalidAttributeValueException;
028:        import javax.management.MBeanException;
029:        import javax.management.ServiceNotFoundException;
030:        import javax.management.modelmbean.InvalidTargetObjectTypeException;
031:
032:        import org.jboss.mx.modelmbean.ModelMBeanConstants;
033:        import org.jboss.mx.server.Invocation;
034:        import org.jboss.mx.server.MBeanInvoker;
035:
036:        /** A dispatcher used by the AbstractMBeanInvoker class for the attribute
037:         * getter and setter dispatch.
038:         * 
039:         * @author Scott.Stark@jboss.org
040:         * @version $Revision: 57200 $
041:         */
042:        public class AttributeDispatcher extends ReflectedDispatcher {
043:            private Method getter;
044:            private Method setter;
045:
046:            public AttributeDispatcher(Method getter, Method setter,
047:                    boolean dynamic) {
048:                super (dynamic);
049:                setName("Attribute Dispatcher");
050:                this .getter = getter;
051:                this .setter = setter;
052:            }
053:
054:            /** Dispatch the attribute set or get. A get is identified by a dispatch
055:             * with a null args value.
056:             * 
057:             * @return the result of the attribute accessor invocation
058:             * @throws InvocationException
059:             */
060:            public Object invoke(Invocation invocation) throws Throwable {
061:                Object target = invocation.getTarget();
062:
063:                Object value = null;
064:                Object[] args = invocation.getArgs();
065:                // Getter
066:                if (args == null) {
067:                    Method getMethod = getter;
068:                    if (dynamic) {
069:                        Descriptor d = invocation.getDescriptor();
070:                        if (d != null) {
071:                            Object descriptorTarget = d
072:                                    .getFieldValue(ModelMBeanConstants.TARGET_OBJECT);
073:                            if (descriptorTarget != null) {
074:                                String targetType = (String) d
075:                                        .getFieldValue(ModelMBeanConstants.TARGET_TYPE);
076:                                if (ModelMBeanConstants.OBJECT_REF
077:                                        .equalsIgnoreCase(targetType) == false)
078:                                    throw new InvalidTargetObjectTypeException(
079:                                            "Target type is " + targetType);
080:                                target = descriptorTarget;
081:                            }
082:                            String getMethodString = (String) d
083:                                    .getFieldValue(ModelMBeanConstants.GET_METHOD);
084:                            if (getMethodString != null
085:                                    && (getMethod == null || getMethodString
086:                                            .equals(getMethod.getName()) == false)) {
087:                                MBeanInvoker invoker = invocation.getInvoker();
088:                                Object object = invoker.invoke(getMethodString,
089:                                        new Object[0], new String[0]);
090:                                checkAssignable(getMethodString, invocation
091:                                        .getAttributeTypeClass(), object);
092:                                return object;
093:                            }
094:                        }
095:                    }
096:                    if (target == null)
097:                        throw new MBeanException(new ServiceNotFoundException(
098:                                "No Target"));
099:                    try {
100:                        value = getMethod.invoke(target, args);
101:                    } catch (Throwable t) {
102:                        handleInvocationExceptions(t);
103:                        return null;
104:                    }
105:                }
106:                // Setter
107:                else {
108:                    Method setMethod = setter;
109:                    if (dynamic) {
110:                        Descriptor d = invocation.getDescriptor();
111:                        if (d != null) {
112:                            Object descriptorTarget = d
113:                                    .getFieldValue(ModelMBeanConstants.TARGET_OBJECT);
114:                            if (descriptorTarget != null) {
115:                                String targetType = (String) d
116:                                        .getFieldValue(ModelMBeanConstants.TARGET_TYPE);
117:                                if (ModelMBeanConstants.OBJECT_REF
118:                                        .equalsIgnoreCase(targetType) == false)
119:                                    throw new InvalidTargetObjectTypeException(
120:                                            "Target type is " + targetType);
121:                                target = descriptorTarget;
122:                            }
123:                            String setMethodString = (String) d
124:                                    .getFieldValue(ModelMBeanConstants.SET_METHOD);
125:                            if (setMethodString != null
126:                                    && (setMethod == null || setMethodString
127:                                            .equals(setMethod.getName()) == false)) {
128:                                MBeanInvoker invoker = invocation.getInvoker();
129:                                return invoker.invoke(setMethodString,
130:                                        new Object[] { args[0] },
131:                                        new String[] { invocation
132:                                                .getAttributeType() });
133:                            }
134:                        }
135:                    }
136:                    if (target == null)
137:                        throw new MBeanException(new ServiceNotFoundException(
138:                                "No Target"));
139:                    try {
140:                        value = setMethod.invoke(target, args);
141:                    } catch (Throwable t) {
142:                        handleInvocationExceptions(t);
143:                        return null;
144:                    }
145:                }
146:                return value;
147:            }
148:
149:            protected void checkAssignable(String context, Class clazz,
150:                    Object value) throws InvalidAttributeValueException,
151:                    ClassNotFoundException {
152:                if (value != null
153:                        && clazz.isAssignableFrom(value.getClass()) == false)
154:                    throw new InvalidAttributeValueException(context
155:                            + " has class " + value.getClass()
156:                            + " loaded from "
157:                            + value.getClass().getClassLoader()
158:                            + " that is not assignable to attribute class "
159:                            + clazz + " loaded from " + clazz.getClassLoader());
160:            }
161:        }
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