/* * 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.*;import org.apache.log4j.spi.HierarchyEventListener;import org.apache.log4j.spi.LoggerRepository;import org.apache.log4j.helpers.OptionConverter;import java.util.Vector;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.NotificationBroadcasterSupport;import javax.management.NotificationBroadcaster;import javax.management.Notification;import javax.management.NotificationListener;import javax.management.NotificationFilter;import javax.management.NotificationFilterSupport;import javax.management.ListenerNotFoundException;public class HierarchyDynamicMBean extends AbstractDynamicMBean                                   implements HierarchyEventListener,                                              NotificationBroadcaster {  static final String ADD_APPENDER = "addAppender.";  static final String THRESHOLD = "threshold";  private MBeanConstructorInfo[] dConstructors = new MBeanConstructorInfo[1];  private MBeanOperationInfo[] dOperations = new MBeanOperationInfo[1];  private Vector vAttributes = new Vector();  private String dClassName = this.getClass().getName();  private String dDescription =     "This MBean acts as a management facade for org.apache.log4j.Hierarchy.";  private NotificationBroadcasterSupport nbs = new NotificationBroadcasterSupport();  private LoggerRepository hierarchy;  private static Logger log = Logger.getLogger(HierarchyDynamicMBean.class);  public HierarchyDynamicMBean() {    hierarchy = LogManager.getLoggerRepository();    buildDynamicMBeanInfo();  }  private  void buildDynamicMBeanInfo() {    Constructor[] constructors = this.getClass().getConstructors();    dConstructors[0] = new MBeanConstructorInfo(         "HierarchyDynamicMBean(): Constructs a HierarchyDynamicMBean instance",	 constructors[0]);    vAttributes.add(new MBeanAttributeInfo(THRESHOLD,					   "java.lang.String",					   "The \"threshold\" state of the hiearchy.",					   true,					   true,					   false));    MBeanParameterInfo[] params = new MBeanParameterInfo[1];    params[0] = new MBeanParameterInfo("name", "java.lang.String",				       "Create a logger MBean" );    dOperations[0] = new MBeanOperationInfo("addLoggerMBean",				    "addLoggerMBean(): add a loggerMBean",				    params ,				    "javax.management.ObjectName",				    MBeanOperationInfo.ACTION);  }  public  ObjectName addLoggerMBean(String name) {    Logger cat = LogManager.exists(name);    if(cat != null) {      return addLoggerMBean(cat);    } else {      return null;    }  }  ObjectName addLoggerMBean(Logger logger) {    String name = logger.getName();    ObjectName objectName = null;    try {      LoggerDynamicMBean loggerMBean = new LoggerDynamicMBean(logger);      objectName = new ObjectName("log4j", "logger", name);      server.registerMBean(loggerMBean, objectName);      NotificationFilterSupport nfs = new NotificationFilterSupport();      nfs.enableType(ADD_APPENDER+logger.getName());      log.debug("---Adding logger ["+name+"] as listener.");      nbs.addNotificationListener(loggerMBean, nfs, null);      vAttributes.add(new MBeanAttributeInfo("logger="+name,					     "javax.management.ObjectName",					     "The "+name+" logger.",					     true,					     true, // this makes the object					     // clickable					     false));    } catch(Exception e) {      log.error("Could not add loggerMBean for ["+name+"].", e);    }    return objectName;  }  public  void addNotificationListener(NotificationListener listener,			       NotificationFilter filter,			       java.lang.Object handback) {    nbs.addNotificationListener(listener, filter, handback);  }  protected  Logger getLogger() {    return log;  }  public  MBeanInfo getMBeanInfo() {    //cat.debug("getMBeanInfo called.");    MBeanAttributeInfo[] attribs = new MBeanAttributeInfo[vAttributes.size()];    vAttributes.toArray(attribs);    return new MBeanInfo(dClassName,			 dDescription,			 attribs,			 dConstructors,			 dOperations,			 new MBeanNotificationInfo[0]);  }  public  MBeanNotificationInfo[] getNotificationInfo(){    return nbs.getNotificationInfo();  }  public  Object invoke(String operationName,		Object params[],		String signature[]) throws MBeanException,                                           ReflectionException {    if (operationName == null) {      throw new RuntimeOperationsException(        new IllegalArgumentException("Operation name cannot be null"),	"Cannot invoke a null operation in " + dClassName);    }    // Check for a recognized operation name and call the corresponding operation    if(operationName.equals("addLoggerMBean")) {      return addLoggerMBean((String)params[0]);    } else {      throw new ReflectionException(	    new NoSuchMethodException(operationName),	    "Cannot find the operation " + operationName + " in " + dClassName);    }  }  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");    }    log.debug("Called getAttribute with ["+attributeName+"].");    // Check for a recognized attributeName and call the corresponding getter    if (attributeName.equals(THRESHOLD)) {      return hierarchy.getThreshold();    } else if(attributeName.startsWith("logger")) {      int k = attributeName.indexOf("%3D");      String val = attributeName;      if(k > 0) {	val = attributeName.substring(0, k)+'='+ attributeName.substring(k+3);      }      try {	return new ObjectName("log4j:"+val);      } catch(Exception e) {	log.error("Could not create ObjectName" + val);      }    }    // If attributeName has not been recognized throw an AttributeNotFoundException    throw(new AttributeNotFoundException("Cannot find " + attributeName +					 " attribute in " + dClassName));  }  public  void addAppenderEvent(Category logger, Appender appender) {    log.debug("addAppenderEvent called: logger="+logger.getName()+	      ", appender="+appender.getName());    Notification n = new Notification(ADD_APPENDER+logger.getName(), this, 0);    n.setUserData(appender);    log.debug("sending notification.");    nbs.sendNotification(n);  } public  void removeAppenderEvent(Category cat, Appender appender) {    log.debug("removeAppenderCalled: logger="+cat.getName()+	      ", appender="+appender.getName());  }  public  void postRegister(java.lang.Boolean registrationDone) {    log.debug("postRegister is called.");    hierarchy.addHierarchyEventListener(this);    Logger root = hierarchy.getRootLogger();    addLoggerMBean(root);  }  public  void removeNotificationListener(NotificationListener listener)                                         throws ListenerNotFoundException {    nbs.removeNotificationListener(listener);  }  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(THRESHOLD)) {      Level l = OptionConverter.toLevel((String) value,					   hierarchy.getThreshold());      hierarchy.setThreshold(l);    }  }}