/*
* Copyright (C) The Apache Software Foundation. All rights reserved.
*
* This software is published under the terms of the Apache Software
* License version 1.1, a copy of which has been included with this
* distribution in the LICENSE.txt file. */
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("Couls not add loggerMBean for ["+name+"].");
}
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);
}
}
}
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