/*
* 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.Layout;
import org.apache.log4j.helpers.OptionConverter;
import org.apache.log4j.spi.OptionHandler;
import java.util.Vector;
import java.util.Hashtable;
import java.lang.reflect.Method;
import javax.management.MBeanAttributeInfo;
import javax.management.MBeanConstructorInfo;
import javax.management.MBeanNotificationInfo;
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.MBeanOperationInfo;
import javax.management.MBeanParameterInfo;
import java.beans.Introspector;
import java.beans.BeanInfo;
import java.beans.PropertyDescriptor;
import java.beans.IntrospectionException;
public class LayoutDynamicMBean extends AbstractDynamicMBean {
private MBeanConstructorInfo[] dConstructors = new MBeanConstructorInfo[1];
private Vector dAttributes = new Vector();
private String dClassName = this.getClass().getName();
private Hashtable dynamicProps = new Hashtable(5);
private MBeanOperationInfo[] dOperations = new MBeanOperationInfo[1];
private String dDescription =
"This MBean acts as a management facade for log4j layouts.";
// This category instance is for logging.
private static Logger cat = Logger.getLogger(LayoutDynamicMBean.class);
// We wrap this layout instance.
private Layout layout;
public LayoutDynamicMBean(Layout layout) throws IntrospectionException {
this.layout = layout;
buildDynamicMBeanInfo();
}
private
void buildDynamicMBeanInfo() throws IntrospectionException {
Constructor[] constructors = this.getClass().getConstructors();
dConstructors[0] = new MBeanConstructorInfo(
"LayoutDynamicMBean(): Constructs a LayoutDynamicMBean instance",
constructors[0]);
BeanInfo bi = Introspector.getBeanInfo(layout.getClass());
PropertyDescriptor[] pd = bi.getPropertyDescriptors();
int size = pd.length;
for(int i = 0; i < size; i++) {
String name = pd[i].getName();
Method readMethod = pd[i].getReadMethod();
Method writeMethod = pd[i].getWriteMethod();
if(readMethod != null) {
Class returnClass = readMethod.getReturnType();
if(isSupportedType(returnClass)) {
String returnClassName;
if(returnClass.isAssignableFrom(Level.class)) {
returnClassName = "java.lang.String";
} else {
returnClassName = returnClass.getName();
}
dAttributes.add(new MBeanAttributeInfo(name,
returnClassName,
"Dynamic",
true,
writeMethod != null,
false));
dynamicProps.put(name, new MethodUnion(readMethod, writeMethod));
}
}
}
MBeanParameterInfo[] params = new MBeanParameterInfo[0];
dOperations[0] = new MBeanOperationInfo("activateOptions",
"activateOptions(): add an layout",
params,
"void",
MBeanOperationInfo.ACTION);
}
private
boolean isSupportedType(Class clazz) {
if(clazz.isPrimitive()) {
return true;
}
if(clazz == String.class) {
return true;
}
if(clazz.isAssignableFrom(Level.class)) {
return true;
}
return false;
}
public
MBeanInfo getMBeanInfo() {
cat.debug("getMBeanInfo called.");
MBeanAttributeInfo[] attribs = new MBeanAttributeInfo[dAttributes.size()];
dAttributes.toArray(attribs);
return new MBeanInfo(dClassName,
dDescription,
attribs,
dConstructors,
dOperations,
new MBeanNotificationInfo[0]);
}
public
Object invoke(String operationName, Object params[], String signature[])
throws MBeanException,
ReflectionException {
if(operationName.equals("activateOptions") &&
layout instanceof OptionHandler) {
OptionHandler oh = (OptionHandler) layout;
oh.activateOptions();
return "Options activated.";
}
return null;
}
protected
Logger getLogger() {
return cat;
}
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");
}
MethodUnion mu = (MethodUnion) dynamicProps.get(attributeName);
cat.debug("----name="+attributeName+", mu="+mu);
if(mu != null && mu.readMethod != null) {
try {
return mu.readMethod.invoke(layout, null);
} catch(Exception e) {
return null;
}
}
// If attributeName has not been recognized throw an AttributeNotFoundException
throw(new AttributeNotFoundException("Cannot find " + attributeName +
" attribute in " + dClassName));
}
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");
}
MethodUnion mu = (MethodUnion) dynamicProps.get(name);
if(mu != null && mu.writeMethod != null) {
Object[] o = new Object[1];
Class[] params = mu.writeMethod.getParameterTypes();
if(params[0] == org.apache.log4j.Priority.class) {
value = OptionConverter.toLevel((String) value,
(Level) getAttribute(name));
}
o[0] = value;
try {
mu.writeMethod.invoke(layout, o);
} catch(Exception e) {
cat.error("FIXME", e);
}
} else {
throw(new AttributeNotFoundException("Attribute " + name +
" not found in " +
this.getClass().getName()));
}
}
}