Source Code Cross Referenced for IntrospectionBasedDynamicBean.java in  » Web-Server » xsocket » distributedcache » management » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Web Server » xsocket » distributedcache.management 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        // $Id: IntrospectionBasedDynamicBean.java 1037 2007-03-20 06:45:01Z grro $
002:        /*
003:         *  Copyright (c) xsocket.org, 2006 - 2007. All rights reserved.
004:         *
005:         *  This library is free software; you can redistribute it and/or
006:         *  modify it under the terms of the GNU Lesser General Public
007:         *  License as published by the Free Software Foundation; either
008:         *  version 2.1 of the License, or (at your option) any later version.
009:         *
010:         *  This library is distributed in the hope that it will be useful,
011:         *  but WITHOUT ANY WARRANTY; without even the implied warranty of
012:         *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
013:         *  Lesser General Public License for more details.
014:         *
015:         *  You should have received a copy of the GNU Lesser General Public
016:         *  License along with this library; if not, write to the Free Software
017:         *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
018:         *
019:         * Please refer to the LGPL license at: http://www.gnu.org/copyleft/lesser.txt
020:         * The latest copy of this software may be found on http://www.xsocket.org/
021:         */
022:        package distributedcache.management;
023:
024:        import java.lang.reflect.Method;
025:        import java.util.HashMap;
026:        import java.util.List;
027:        import java.util.Map;
028:
029:        import javax.management.Attribute;
030:        import javax.management.AttributeList;
031:        import javax.management.AttributeNotFoundException;
032:        import javax.management.DynamicMBean;
033:        import javax.management.InvalidAttributeValueException;
034:        import javax.management.MBeanAttributeInfo;
035:        import javax.management.MBeanException;
036:        import javax.management.MBeanInfo;
037:        import javax.management.ReflectionException;
038:
039:        /**
040:         * introspection based dynamic mbean, which exposes the getter and setter methods 
041:         * (all visibilities) of the underlying object by using introspection
042:         * 
043:         * @author grro@xsocket.org
044:         */
045:        final class IntrospectionBasedDynamicBean implements  DynamicMBean {
046:
047:            private Object obj = null;
048:
049:            private final Map<String, Info> properties = new HashMap<String, Info>();
050:
051:            /**
052:             * constructore
053:             *  
054:             * @param obj  the object to create a mbean for
055:             */
056:            IntrospectionBasedDynamicBean(Object obj) {
057:                this .obj = obj;
058:            }
059:
060:            /**
061:             * @see javax.management.DynamicMBean#getAttribute(java.lang.String)
062:             */
063:            public Object getAttribute(String attribute)
064:                    throws AttributeNotFoundException, MBeanException,
065:                    ReflectionException {
066:                String methodName = "get" + attribute;
067:                try {
068:                    Method method = getMethod(obj.getClass(), methodName,
069:                            new Class[0]);
070:                    method.setAccessible(true);
071:                    return method.invoke(obj, new Object[0]);
072:                } catch (Exception e) {
073:                    throw new ReflectionException(e);
074:                }
075:            }
076:
077:            @SuppressWarnings("unchecked")
078:            private Method getMethod(Class clazz, String methodname,
079:                    Class[] params) {
080:                do {
081:                    try {
082:                        Method method = clazz.getDeclaredMethod(methodname,
083:                                params);
084:                        method.setAccessible(true);
085:                        return method;
086:                    } catch (Exception ignore) {
087:                    }
088:
089:                    for (Class interf : clazz.getInterfaces()) {
090:                        getMethod(interf, methodname, params);
091:                    }
092:
093:                    clazz = clazz.getSuperclass();
094:
095:                } while (clazz != null);
096:
097:                return null;
098:            }
099:
100:            /**
101:             * {@inheritDoc}
102:             */
103:            public AttributeList getAttributes(String[] attributes) {
104:                AttributeList list = new AttributeList();
105:                for (String attribute : attributes) {
106:                    try {
107:                        list.add(new Attribute(attribute,
108:                                getAttribute(attribute)));
109:                    } catch (Exception ignore) {
110:                    }
111:                }
112:                return list;
113:            }
114:
115:            /**
116:             * {@inheritDoc}
117:             */
118:            public void setAttribute(Attribute attribute)
119:                    throws AttributeNotFoundException,
120:                    InvalidAttributeValueException, MBeanException,
121:                    ReflectionException {
122:                String methodName = "set" + attribute.getName();
123:
124:                Info info = getInfo(attribute.getName());
125:
126:                try {
127:                    Method method = getMethod(obj.getClass(), methodName,
128:                            new Class[] { info.propertyType });
129:                    method.setAccessible(true);
130:                    method.invoke(obj, new Object[] { attribute.getValue() });
131:                } catch (Exception e) {
132:                    throw new ReflectionException(e);
133:                }
134:            }
135:
136:            /**
137:             * {@inheritDoc}
138:             */
139:            public AttributeList setAttributes(AttributeList attributes) {
140:                AttributeList result = new AttributeList();
141:
142:                Attribute[] attrs = (Attribute[]) attributes
143:                        .toArray(new Attribute[attributes.size()]);
144:                for (Attribute attr : attrs) {
145:                    try {
146:                        setAttribute(attr);
147:                        result.add(new Attribute(attr.getName(), attr
148:                                .getValue()));
149:                    } catch (Exception ignore) {
150:                    }
151:                }
152:                return result;
153:            }
154:
155:            /**
156:             * {@inheritDoc}
157:             */
158:            public Object invoke(String actionName, Object[] params,
159:                    String[] signature) throws MBeanException,
160:                    ReflectionException {
161:                // TODO Auto-generated method stub
162:                return null;
163:            }
164:
165:            /**
166:             * {@inheritDoc}
167:             */
168:            public synchronized MBeanInfo getMBeanInfo() {
169:
170:                analyze(obj);
171:
172:                String[] attributes = properties.keySet().toArray(
173:                        new String[properties.size()]);
174:                MBeanAttributeInfo[] attrs = new MBeanAttributeInfo[attributes.length];
175:                for (int i = 0; i < attrs.length; i++) {
176:                    attrs[i] = properties.get(attributes[i])
177:                            .asbMBeanAttributeInfo();
178:                }
179:
180:                return new MBeanInfo(obj.getClass().getName(), "", attrs, null, // constructors
181:                        null, null); // notifications
182:            }
183:
184:            private void analyze(Object obj) {
185:                Class clazz = obj.getClass();
186:                do {
187:                    analyzeType(clazz);
188:
189:                    for (Class interf : clazz.getInterfaces()) {
190:                        analyzeType(interf);
191:                    }
192:
193:                    clazz = clazz.getSuperclass();
194:
195:                } while (clazz != null);
196:            }
197:
198:            private void analyzeType(Class clazz) {
199:                for (Method method : clazz.getDeclaredMethods()) {
200:                    String name = method.getName();
201:
202:                    if ((name.length() > 3) && name.startsWith("get")) {
203:                        if (method.getParameterTypes().length == 0) {
204:                            Class propertyType = method.getReturnType();
205:
206:                            if (isAcceptedPropertyType(propertyType)) {
207:                                Info info = registerInfo(name.substring(3, name
208:                                        .length()));
209:                                info.isReadable = true;
210:                                info.propertyType = propertyType;
211:                            }
212:                        }
213:                    }
214:
215:                    if ((name.length() > 3) && name.startsWith("set")) {
216:                        if (method.getParameterTypes().length == 1) {
217:                            Class propertyType = method.getParameterTypes()[0];
218:
219:                            if (isAcceptedPropertyType(propertyType)) {
220:                                Info info = registerInfo(name.substring(3, name
221:                                        .length()));
222:                                info.isWriteable = true;
223:                                info.propertyType = propertyType;
224:                            }
225:                        }
226:                    }
227:                }
228:            }
229:
230:            private Info registerInfo(String name) {
231:                Info info = properties.get(name);
232:                if (info == null) {
233:                    info = new Info();
234:                    info.propertyName = name;
235:                    info.propertyDescription = "Property " + info.propertyName;
236:                    properties.put(name, info);
237:                }
238:                return info;
239:            }
240:
241:            private Info getInfo(String name) {
242:                Info info = properties.get(name);
243:                if (info == null) {
244:                    info = new Info();
245:                    info.propertyName = name;
246:                    info.propertyDescription = "Property " + info.propertyName;
247:                }
248:                return info;
249:            }
250:
251:            @SuppressWarnings("unchecked")
252:            private boolean isAcceptedPropertyType(Class clazz) {
253:                if (clazz.isAssignableFrom(List.class)) {
254:                    return true;
255:                }
256:                if (clazz.isArray()) {
257:                    return true;
258:                }
259:
260:                String name = clazz.getName();
261:                return name.equals("int") || name.equals("java.lang.Integer")
262:                        || name.equals("long") || name.equals("java.lang.Long")
263:                        || name.equals("double")
264:                        || name.equals("java.lang.Double")
265:                        || name.equals("boolean")
266:                        || name.equals("java.lang.Boolean")
267:                        || name.equals("float")
268:                        || name.equals("java.lang.String")
269:                        || name.equals("java.lang.Float");
270:            }
271:
272:            private static class Info {
273:                String propertyName = null;
274:                Class propertyType = null;
275:                String propertyDescription = null;
276:                boolean isReadable = false;
277:                boolean isWriteable = false;
278:                boolean isIs = false;
279:
280:                MBeanAttributeInfo asbMBeanAttributeInfo() {
281:                    return new MBeanAttributeInfo(propertyName, propertyType
282:                            .getName(), propertyDescription, isReadable,
283:                            isWriteable, isIs);
284:                }
285:            }
286:        }
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