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/*
* Copyright 2004-2005 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
package com.sun.enterprise.web.monitor.impl;
import java.io.ObjectInputStream;
import java.util.Hashtable;
import java.util.ArrayList;
import java.util.logging.Level;
import javax.management.ObjectName;
import javax.management.MBeanServerFactory;
import javax.management.MBeanServer;
import com.sun.enterprise.web.monitor.PwcServletStats;
public class PwcServletStatsImpl implements PwcServletStats {
private transient MBeanServer server;
private ObjectName servletObjName;
/**
* Constructor.
*
* The ObjectName of the Servlet MBean follows this pattern:
*
* <domain>:j2eeType=Servlet,name=<servlet/jsp name>,
* WebModule=<webmodule name>,J2EEApplication=<application name>,
* J2EEServer=<server name>
*
* Example: com.sun.appserv:j2eeType=Servlet,name=default,
* WebModule=//server/,J2EEApplication=null,J2EEServer=server
*
* @param domain Domain in which the Servlet MBean is registered
* @param vsId Id of the virtual-server for which servlet monitoring
* is being enabled
* @param contextPath Context path of the webmodule
* @param servletName Name of the Servlet/JSP
* @param appName Name of the J2EE App to which the web module belongs, or
* null if web module is standalone
* @param serverName Name of the server instance
*/
public PwcServletStatsImpl(String domain,
String vsId,
String contextPath,
String servletName,
String appName,
String serverName) {
// Get an instance of the MBeanServer
ArrayList servers = MBeanServerFactory.findMBeanServer(null);
if(servers != null && !servers.isEmpty())
server = (MBeanServer)servers.get(0);
else
server = MBeanServerFactory.createMBeanServer();
// Construct the ObjectName of the Servlet MBean
String objNameStr = domain
+ ":j2eeType=Servlet"
+ ",name=" + servletName
+ ",WebModule=" + createTomcatWebModuleName(vsId, contextPath)
+ ",J2EEApplication=" + appName
+ ",J2EEServer=" + serverName;
try {
servletObjName = new ObjectName(objNameStr);
} catch (Throwable t) {
MonitorUtil.log(Level.SEVERE,
"pwc.monitoring.objectNameCreationError",
new Object[] { objNameStr },
t);
}
}
/**
* Gets the maximum request processing time of the servlet being
* monitored.
*
* @return Maximum request processing time
*/
public long getMaxTimeMillis() {
return getLongValue(queryStatistic(servletObjName, "maxTimeMillis"));
}
/**
* Gets the minimum request processing time of the servlet being monitored.
*
* @return Minimum request processing time
*/
public long getMinTimeMillis() {
return getLongValue(queryStatistic(servletObjName, "minTimeMillis"));
}
/**
* Gets the total execution time of the service method of the servlet being
* monitored.
*
* @return Execution time of the servlet's service method
*/
public long getProcessingTimeMillis() {
return getLongValue(queryStatistic(servletObjName,
"processingTimeMillis"));
}
/**
* Gets the number of requests processed by the servlet being monitored.
*
* @return Number of processed requests
*/
public int getRequestCount() {
return getIntValue(queryStatistic(servletObjName, "requestCount"));
}
/**
* Gets the number of requests processed by the servlet being monitored
* that resulted in errors.
*
* @return Error count
*/
public int getErrorCount() {
return getIntValue(queryStatistic(servletObjName, "errorCount"));
}
/*
* Queries the MBeanServer for an attribute.
*
* @param on The ObjectName of the MBean being queried
* @param attrName The name of the attribute whose value is to be
* returned
*
* @return The value corresponding to the given attribute name
*/
private Object queryStatistic(ObjectName on, String attrName) {
Object resultObj = null;
try {
resultObj = server.getAttribute(on, attrName);
} catch (Throwable t) {
MonitorUtil.log(Level.SEVERE,
"pwc.monitoring.queryError",
new Object[] { attrName, on },
t);
}
return resultObj;
}
/*
* Constructs the WebModule component of the Servlet MBean ObjectName.
*
* @param vsId The id of the virtual server on which the webmodule has been
* deployed
* @param contextPath The contextPath of the webmodule
*
* @return WebModule component of the Servlet MBean ObjectName
*/
private String createTomcatWebModuleName(String vsId, String contextPath) {
final String PREFIX = "//";
String tcWebModuleName;
if ((contextPath != null) && (!contextPath.equals(""))) {
tcWebModuleName = PREFIX + vsId + contextPath;
} else {
tcWebModuleName = PREFIX + vsId + "/";
}
return tcWebModuleName;
}
private long getLongValue(Object resultObj) {
long result = 0;
if (resultObj != null) {
Long countObj = (Long)resultObj;
result = countObj.longValue();
}
return result;
}
private int getIntValue(Object resultObj) {
int result = 0;
if (resultObj != null) {
Integer countObj = (Integer)resultObj;
result = countObj.intValue();
}
return result;
}
/*
* Restores this object's state from a stream.
*
* @param ois Stream from which to restore this object's state
*/
private void readObject(ObjectInputStream ois)
throws java.io.IOException, ClassNotFoundException {
ois.defaultReadObject();
// Get an instance of the MBeanServer
ArrayList servers = MBeanServerFactory.findMBeanServer(null);
if (servers != null && !servers.isEmpty()) {
server = (MBeanServer)servers.get(0);
} else {
server = MBeanServerFactory.createMBeanServer();
}
}
}
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