[patch] Adds a test before register a MBean

LoggerDynamicMBean.java (text/plain), 8.33 KB, created by Francesco Dalan on 2007-04-02 03:46:31 UTC

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Description: Adds a test before register a MBean

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Creator: Francesco Dalan

Created: 2007-04-02 03:46:31 UTC

Size: 8.33 KB

patch

obsolete

>/* > * Copyright 1999-2005 The Apache Software Foundation. > * > * Licensed under the Apache License, Version 2.0 (the "License"); > * you may not use this file except in compliance with the License. > * You may obtain a copy of the License at > * > * http://www.apache.org/licenses/LICENSE-2.0 > * > * Unless required by applicable law or agreed to in writing, software > * distributed under the License is distributed on an "AS IS" BASIS, > * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. > * See the License for the specific language governing permissions and > * limitations under the License. > */ > >package org.apache.log4j.jmx; > >import java.lang.reflect.Constructor; >import org.apache.log4j.Logger; >import org.apache.log4j.Level; >import org.apache.log4j.Appender; >import org.apache.log4j.helpers.OptionConverter; > >import java.util.Vector; >import java.util.Enumeration; > >import javax.management.MBeanAttributeInfo; >import javax.management.MBeanConstructorInfo; >import javax.management.MBeanNotificationInfo; >import javax.management.MBeanOperationInfo; >import javax.management.MBeanParameterInfo; >import javax.management.ObjectName; >import javax.management.MBeanInfo; >import javax.management.Attribute; > >import javax.management.MBeanException; >import javax.management.AttributeNotFoundException; >import javax.management.RuntimeOperationsException; >import javax.management.ReflectionException; >import javax.management.InvalidAttributeValueException; >import javax.management.NotificationListener; >import javax.management.Notification; > >public class LoggerDynamicMBean extends AbstractDynamicMBean > implements NotificationListener { > > private MBeanConstructorInfo[] dConstructors = new MBeanConstructorInfo[1]; > private MBeanOperationInfo[] dOperations = new MBeanOperationInfo[1]; > > private Vector dAttributes = new Vector(); > private String dClassName = this.getClass().getName(); > > private String dDescription = > "This MBean acts as a management facade for a org.apache.log4j.Logger instance."; > > // This Logger instance is for logging. > private static Logger cat = Logger.getLogger(LoggerDynamicMBean.class); > > // We wrap this Logger instance. > private Logger logger; > > public LoggerDynamicMBean(Logger logger) { > this.logger = logger; > buildDynamicMBeanInfo(); > } > > public > void handleNotification(Notification notification, Object handback) { > cat.debug("Received notification: "+notification.getType()); > registerAppenderMBean((Appender) notification.getUserData() ); > > > } > > private > void buildDynamicMBeanInfo() { > Constructor[] constructors = this.getClass().getConstructors(); > dConstructors[0] = new MBeanConstructorInfo( > "HierarchyDynamicMBean(): Constructs a HierarchyDynamicMBean instance", > constructors[0]); > > dAttributes.add(new MBeanAttributeInfo("name", > "java.lang.String", > "The name of this Logger.", > true, > false, > false)); > > dAttributes.add(new MBeanAttributeInfo("priority", > "java.lang.String", > "The priority of this logger.", > true, > true, > false)); > > > > > > MBeanParameterInfo[] params = new MBeanParameterInfo[2]; > params[0] = new MBeanParameterInfo("class name", "java.lang.String", > "add an appender to this logger"); > params[1] = new MBeanParameterInfo("appender name", "java.lang.String", > "name of the appender"); > > dOperations[0] = new MBeanOperationInfo("addAppender", > "addAppender(): add an appender", > params, > "void", > MBeanOperationInfo.ACTION); > } > > protected > Logger getLogger() { > return logger; > } > > > public > MBeanInfo getMBeanInfo() { > //cat.debug("getMBeanInfo called."); > > MBeanAttributeInfo[] attribs = new MBeanAttributeInfo[dAttributes.size()]; > dAttributes.toArray(attribs); > > MBeanInfo mb = new MBeanInfo(dClassName, > dDescription, > attribs, > dConstructors, > dOperations, > new MBeanNotificationInfo[0]); > //cat.debug("getMBeanInfo exit."); > return mb; > } > > public > Object invoke(String operationName, Object params[], String signature[]) > throws MBeanException, > ReflectionException { > > if(operationName.equals("addAppender")) { > addAppender((String) params[0], (String) params[1]); > return "Hello world."; > } > > return null; > } > > > public > Object getAttribute(String attributeName) throws AttributeNotFoundException, > MBeanException, > ReflectionException { > > // Check attributeName is not null to avoid NullPointerException later on > if (attributeName == null) { > throw new RuntimeOperationsException(new IllegalArgumentException( > "Attribute name cannot be null"), > "Cannot invoke a getter of " + dClassName + " with null attribute name"); > } > > // Check for a recognized attributeName and call the corresponding getter > if (attributeName.equals("name")) { > return logger.getName(); > } else if(attributeName.equals("priority")) { > Level l = logger.getLevel(); > if(l == null) { > return null; > } else { > return l.toString(); > } > } else if(attributeName.startsWith("appender=")) { > try { > return new ObjectName("log4j:"+attributeName ); > } catch(Exception e) { > cat.error("Could not create ObjectName" + attributeName); > } > } > > > // If attributeName has not been recognized throw an AttributeNotFoundException > throw(new AttributeNotFoundException("Cannot find " + attributeName + > " attribute in " + dClassName)); > > } > > > void addAppender(String appenderClass, String appenderName) { > cat.debug("addAppender called with "+appenderClass+", "+appenderName); > Appender appender = (Appender) > OptionConverter.instantiateByClassName(appenderClass, > org.apache.log4j.Appender.class, > null); > appender.setName(appenderName); > logger.addAppender(appender); > > //appenderMBeanRegistration(); > > } > > > public > void setAttribute(Attribute attribute) throws AttributeNotFoundException, > InvalidAttributeValueException, > MBeanException, > ReflectionException { > > // Check attribute is not null to avoid NullPointerException later on > if (attribute == null) { > throw new RuntimeOperationsException( > new IllegalArgumentException("Attribute cannot be null"), > "Cannot invoke a setter of " + dClassName + > " with null attribute"); > } > String name = attribute.getName(); > Object value = attribute.getValue(); > > if (name == null) { > throw new RuntimeOperationsException( > new IllegalArgumentException("Attribute name cannot be null"), > "Cannot invoke the setter of "+dClassName+ > " with null attribute name"); > } > > > if(name.equals("priority")) { > if (value instanceof String) { > String s = (String) value; > Level p = logger.getLevel(); > if(s.equalsIgnoreCase("NULL")) { > p = null; > } else { > p = OptionConverter.toLevel(s, p); > } > logger.setLevel(p); > } > } else { > throw(new AttributeNotFoundException("Attribute " + name + > " not found in " + > this.getClass().getName())); > } > } > > void appenderMBeanRegistration() { > Enumeration enumeration = logger.getAllAppenders(); > while(enumeration.hasMoreElements()) { > Appender appender = (Appender) enumeration.nextElement(); > registerAppenderMBean(appender); > } > } > > void registerAppenderMBean(Appender appender) { > String name = appender.getName(); > cat.debug("Adding AppenderMBean for appender named "+name); > ObjectName objectName = null; > try { > AppenderDynamicMBean appenderMBean = new AppenderDynamicMBean(appender); > objectName = new ObjectName("log4j", "appender", name); > > if (!server.isRegistered(objectName)) {//patch > server.registerMBean(appenderMBean, objectName); > > dAttributes.add(new MBeanAttributeInfo("appender="+name, > "javax.management.ObjectName", > "The "+name+" appender.", > true, > true, > false)); > } //patch > > } catch(Exception e) { > cat.error("Could not add appenderMBean for ["+name+"].", e); > } > } > > public > void postRegister(java.lang.Boolean registrationDone) { > appenderMBeanRegistration(); > } >} View Attachment As Diff View Attachment As Raw

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