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package com.sun.enterprise.web.stats;
import java.util.Iterator;
import java.util.logging.Logger;
import java.util.logging.Level;
import java.text.MessageFormat;
import javax.management.MBeanServer;
import javax.management.ObjectName;
import com.sun.logging.LogDomains;
/**
* Utility class for retrieving and manipulating stats.
*/
public final class StatsUtil {
private static final Logger _logger =
LogDomains.getLogger(LogDomains.WEB_LOGGER);
/**
* Queries the MBean with the given object name for the value of the
* attribute with the given name.
*
* @param server MBean server
* @param on MBean object name
* @param attrName Attribute name
*
* @return Attribute value
*/
static Object getStatistic(MBeanServer server, ObjectName on,
String attrName) {
Object resultObj = null;
try {
resultObj = server.getAttribute(on, attrName);
} catch (Throwable t) {
String msg = _logger.getResourceBundle().getString(
"webcontainer.mbeanQueryError");
msg = MessageFormat.format(msg, new Object[] { attrName, on });
_logger.log(Level.WARNING, msg, t);
}
return resultObj;
}
/**
* Queries the first MBeans corresponding to the given (wildcard)
* object name for the value of the attribute with the given name, and
* returns it.
*
* This method assumes that the given attribute name has the same value
* for all MBeans corresponding to the given wildcard object name.
*
* @param server MBean server
* @param on MBean object name
* @param attrName Attribute name
*
* @return Attribute values
*/
static int getConstant(MBeanServer server, ObjectName on,
String attrName) {
int result = 0;
Iterator iter = server.queryNames(on, null).iterator();
if (iter.hasNext()) {
Object obj = StatsUtil.getStatistic(server,
(ObjectName) iter.next(),
attrName);
result = getIntValue(obj);
}
return result;
}
/**
* Queries the MBeans corresponding to the given (wildcard) object name
* for the value of the attribute with the given name, and returns the
* aggregated attribute values.
*
* @param server MBean server
* @param on MBean object name
* @param attrName Attribute name
*
* @return Aggregated attribute values
*/
static int getAggregateStatistic(MBeanServer server, ObjectName on,
String attrName) {
int result = 0;
Iterator iter = server.queryNames(on, null).iterator();
while (iter.hasNext()) {
Object obj = StatsUtil.getStatistic(server,
(ObjectName) iter.next(),
attrName);
if (obj != null) {
result += getIntValue(obj);
}
}
return result;
}
/**
* Queries the MBeans corresponding to the given (wildcard) object name
* for the value of the attribute with the given name, and returns the
* aggregated attribute values.
*
* @param server MBean server
* @param on MBean object name
* @param attrName Attribute name
*
* @return Aggregated attribute values
*/
static long getAggregateLongStatistic(MBeanServer server, ObjectName on,
String attrName) {
long result = 0;
Iterator iter = server.queryNames(on, null).iterator();
while (iter.hasNext()) {
Object obj = StatsUtil.getStatistic(server,
(ObjectName) iter.next(),
attrName);
if (obj != null) {
result += getLongValue(obj);
}
}
return result;
}
/**
* Queries the MBeans corresponding to the given (wildcard) object name
* for the value of the attribute with the given name, and returns the
* largest attribute value.
*
* @param server MBean server
* @param on MBean object name
* @param attrName Attribute name
*
* @return Largest attribute value
*/
static int getMaxStatistic(MBeanServer server, ObjectName on,
String attrName) {
int max = 0;
Iterator iter = server.queryNames(on, null).iterator();
while (iter.hasNext()) {
Object obj = StatsUtil.getStatistic(server,
(ObjectName) iter.next(),
attrName);
int result = getIntValue(obj);
if (result > max) {
max = result;
}
}
return max;
}
/**
* Queries the MBeans corresponding to the given (wildcard) object name
* for the value of the attribute with the given name, and returns the
* average attribute value.
*
* @param server MBean server
* @param on MBean object name
* @param attrName Attribute name
*
* @return Average attribute value
*/
static int getAverageStatistic(MBeanServer server, ObjectName on,
String attrName) {
int total = 0;
int num = 0;
Iterator iter = server.queryNames(on, null).iterator();
while (iter.hasNext()) {
Object obj = StatsUtil.getStatistic(server,
(ObjectName) iter.next(),
attrName);
if (obj != null) {
total += getIntValue(obj);
num++;
}
}
return total/num;
}
static int getIntValue(Object resultObj) {
int result = 0;
if (resultObj instanceof Integer) {
Integer countObj = (Integer)resultObj;
result = countObj.intValue();
}
return result;
}
static long getLongValue(Object resultObj) {
long result = 0;
if (resultObj instanceof Long) {
result = ((Long)resultObj).longValue();
} else if (resultObj instanceof Integer) {
result = ((Integer)resultObj).intValue();
}
return result;
}
/**
* Queries the MBeans corresponding to the given (wildcard) object name
* for the value of the attribute with the given name, and returns the
* largest attribute value.
*
* @param server MBean server
* @param on MBean object name
* @param attrName Attribute name
*
* @return Largest attribute value
*/
static long getMaxLongStatistic(MBeanServer server, ObjectName on,
String attrName) {
long max = 0;
Iterator iter = server.queryNames(on, null).iterator();
while (iter.hasNext()) {
Object obj = StatsUtil.getStatistic(server,
(ObjectName) iter.next(),
attrName);
long result = getLongValue(obj);
if (result > max) {
max = result;
}
}
return max;
}
}
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