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/* GeneratedMonitoringMBeanImpl.java
* $Id: GeneratedMonitoringMBeanImpl.java,v 1.7 2007/05/05 05:24:19 tcfujii Exp $
* $Revision: 1.7 $
* $Date: 2007/05/05 05:24:19 $
* Indentation Information:
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* 2. In vi/vim -
* :set tabstop=4 :set shiftwidth=4 :set softtabstop=4
* 3. In S1 Studio -
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*/
package com.sun.enterprise.admin.monitor.registry.spi;
//import com.sun.enterprise.admin.monitor.registry.StatsHolder;
import javax.management.*;
import javax.management.j2ee.statistics.Stats;
import javax.management.j2ee.statistics.*;
import java.util.*;
import java.util.logging.*;
import java.lang.reflect.*;
import java.lang.*;
/**
* A generic dynamic mbean implementation for Monitoring which instruments a
* JSR77 compliant Stats object to be managed by this JMX managed object.
* @author <a href=mailto:shreedhar.ganapathy@sun.com>Shreedhar Ganapathy</a>
*/
public class GeneratedMonitoringMBeanImpl implements DynamicMBean {
volatile MBeanInfo mbeanInfo;
final Stats resourceInstance;
public static final String LOGGER_NAME="this.is.console";
final Logger logger;
final HashSet<String> attributeSet;
//StatsHolder statsHolder = null;
/**
* constructs a monitoring mbean that manages an underlying Stats resource
*/
public GeneratedMonitoringMBeanImpl(Stats stats) {
logger = Logger.getLogger(LOGGER_NAME);
this.resourceInstance=stats;
attributeSet=new HashSet<String>();
}
/**
* introspects the underlying Stats resource and generates an MBeanInfo object
* and populates attributes internally for later use culled from the
* Statistic objects returned by the Stats object.
* @param javax.management.j2ee.statistics.Stats
* @param javax.management.MBeanInfo
*/
final MBeanInfo introspect(){
// !!! 'mbeanInfo' must be 'volatile' !!!
// this is thread-safe, not the double-null-check idiom so long as
// 'mbeanInfo' is 'volatile'
if ( mbeanInfo != null ) {
return mbeanInfo;
}
synchronized( this ) {
if ( mbeanInfo == null ) {
ManagedResourceIntrospector mri = new ManagedResourceIntrospector(this);
mbeanInfo = mri.introspect(this.resourceInstance);
setUpAttributeSet();
}
}
return mbeanInfo;
}
/**
* sets up the internal data structure to hold attributes derived from
* Statistic objects returned by the Stats object.
*/
private void setUpAttributeSet(){
MBeanAttributeInfo[] attrInfo = mbeanInfo.getAttributes();
String attr =null;
for(int i=0;i<attrInfo.length;i++){
attr = attrInfo[i].getName();
attributeSet.add(attr);
}
}
/**
* Implementation of DynamicMBean interface's method. Parses the passed in
* attribute into two portions.
* One portion invokes the corresponding method in the Stats object and
* the second portion is used to invoke the underlying method in the
* Statistic object returned by the Stats object in the first invocation.
* Example of an attribute pattern: For JVMStats, HeapSize_UpperBound would
* translate into JVMStats.getHeapSize() which returns a BoundedRangeStatistic
* object. The BoundedRangeStatistic.getUpperBound() method is invoked
* to return the value of the attribute to the client.
* @param java.lang.String
* @return java.lang.Object
* @throws javax.management.AttributeNotFoundException
* @throws javax.management.MBeanException
* @throws javax.management.ReflectionException
*/
public Object getAttribute(String str)
throws javax.management.AttributeNotFoundException,
javax.management.MBeanException, javax.management.ReflectionException {
if(str == null){
throw new NullPointerException("An attribute needs to be specified to get value");
}
introspect();
if(!isValidAttribute(str)){
throw new AttributeNotFoundException("The requested attribute is not recognized");
}
Statistic a = null;
Object retval=null;
String[] attrParts = AttributeStringHelper.splitAttribute(str);
logger.log(Level.INFO,"accessing the Stats object with attr="+attrParts[0]);
a = (Statistic)resourceInstance.getStatistic(attrParts[0]);
if(a == null){
try{
a = (Statistic)resourceInstance.getClass().
getMethod("get"+str).
invoke(resourceInstance);
}
catch(Exception e){
logger.log(Level.INFO,e.getLocalizedMessage());
}
}
//note: do not change this to an "else{ }" block
if(a != null){
try{
retval = a.getClass().getMethod("get"+attrParts[1]).invoke(a);
}
catch(Exception e){
logger.log(Level.INFO,e.getLocalizedMessage());
logger.log(Level.FINE,e.getStackTrace().toString());
}
}
return retval;
}
/**
* checks if the passed in string is a recognized attribute
* @param java.lang.String
* @return boolean
*/
private boolean isValidAttribute(String str){
if(attributeSet.contains(str))
return true;
return false;
}
/**
* Implementation of DynamicMBean interface's method. Loops through the
* passed in String[] and calls getAttribute(str) for each element.
* @param java.lang.String[]
* @return javax.management.AttributeList
*/
public javax.management.AttributeList getAttributes(String[] str) {
introspect();
AttributeList list = new AttributeList();
try{
for(int i=0; i<str.length;i++){
list.add(i, new Attribute(str[i],getAttribute(str[i])));
}
}
catch(Exception e){
logger.log(Level.INFO,e.getMessage()+"\n"+e.getCause().toString());
}
return list;
}
/**
* Implementation of DynamicMBean interface's method. Returns the MBeanInfo
* object that was generated during introspection of the underlying Stats
* resource.
* @return javax.management.MBeanInfo
*/
public javax.management.MBeanInfo getMBeanInfo() {
introspect();
return mbeanInfo;
}
public Object invoke(String str, Object[] obj, String[] str2) throws
javax.management.MBeanException, javax.management.ReflectionException{
introspect();
Object a =null;
Class[] c = new Class[]{};
for(int i=0; i<str2.length;i++){
c[i] = str2[i].getClass();
}
try{
a = (Object) resourceInstance.getClass().getMethod(str, c).invoke(resourceInstance, obj);
}
catch(Exception e){
logger.log(Level.INFO,e.getLocalizedMessage());
logger.log(Level.FINE,e.getStackTrace().toString());
}
return a;
}
/**
* Implementation of DynamicMBean interface's method - NO-OP.
* @param javax.management.Attribute
* @throws javax.management.AttributeNotFoundException
* @throws javax.management.InvalidAttributeValueException
* @throws javax.management.MBeanException
* @throws javax.management.ReflectionException
*/
public void setAttribute(javax.management.Attribute attribute) throws
javax.management.AttributeNotFoundException,
javax.management.InvalidAttributeValueException,
javax.management.MBeanException,
javax.management.ReflectionException { }
/**
* Implementation of DynamicMBean interface's method. Sets a list of attributes.
* Iterates through the list and calls setAttribute() for each element.
* @param javax.management.AttributeList
* @return javax.management.AttributeList
*/
public javax.management.AttributeList setAttributes(
javax.management.AttributeList attributeList) {
return new AttributeList();
}
/**
* Returns String[] of attribute names.
* @return String[]
*/
public String[] listAttributes(){
String[] array = new String[attributeSet.size()];
attributeSet.toArray(array);
return array;
}
}
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