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package com.sun.enterprise.admin.alert;
import javax.management.NotificationListener;
import javax.management.NotificationFilter;
import javax.management.MBeanServer;
import javax.management.ObjectName;
import java.lang.reflect.Method;
import java.lang.reflect.Field;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.List;
import java.util.ArrayList;
import java.util.StringTokenizer;
import java.util.logging.ErrorManager;
import java.util.logging.Logger;
import java.util.logging.Level;
import com.sun.enterprise.admin.server.core.AdminService;
import com.sun.enterprise.server.ServerContext;
import com.sun.enterprise.server.ApplicationServer;
import com.sun.enterprise.config.serverbeans.ElementProperty;
import com.sun.enterprise.config.serverbeans.AlertService;
import com.sun.enterprise.config.serverbeans.AlertSubscription;
import com.sun.enterprise.config.serverbeans.ServerBeansFactory;
import com.sun.enterprise.config.serverbeans.ListenerConfig;
import com.sun.enterprise.config.serverbeans.FilterConfig;
import com.sun.enterprise.server.logging.LogMBean;
import com.sun.appserv.management.alert.LogDomains;
/**
* AlertConfigurator reads the domain.xml entries and configures the
* NotificationListeners and NotificationFilters and keeps it ready to
* subscribe (add) to the Target MBeans(Monitors) to recieve alerts.
*
* @AUTHOR: Hemanth Puttaswamy
*/
public class AlertConfigurator {
// A standard name for MBeanServerDelegate
private static final String MBEAN_SERVER_DELEGATE_OBJECT_NAME =
"JMImplementation:type=MBeanServerDelegate";
// A standard name for MBeanServerDelegate
private static final String DEFAULT_FILTER_CLASS_NAME =
"com.sun.appserv.management.alert.MailFilter";
// A standard name for MBeanServerDelegate
private static final String LOG_MBEAN_NAME = "LogMBean";
private static final AlertConfigurator instance = new AlertConfigurator( );
/**
* A Singleton Accessor method.
*/
public static AlertConfigurator getAlertConfigurator( ) {
return instance;
}
private AlertConfigurator( ) { }
/**
* Get AlertService config from domain.xml
*/
private AlertService getAlertService( ) {
try {
ServerContext sc = ApplicationServer.getServerContext();
if( sc == null ) {
return null;
}
return ServerBeansFactory.getConfigBean(
sc.getConfigContext()).getAlertService( );
} catch( Exception e ) {
new ErrorManager().error( "Error In getAlertService ", e,
ErrorManager.GENERIC_FAILURE );
}
return null;
}
/**
* Configure will be called only once to read the domain.xml entries
* and configure the Notification Listener and Filter. It will also
* create a list of AlertSubscription objects and creates
* MBeanServerRegistrationEventListener to listen to RegisterMBean events
* and add the Notification Listener if required.
*/
public void configure( ) {
Logger logger = LogDomains.getAlertLogger( );
if( logger.isLoggable( Level.FINE ) ) {
logger.log( Level.FINE, "AlertConfigurator.configure called.." );
}
AlertService alertService = getAlertService( );
if( alertService != null ) {
int count = alertService.sizeAlertSubscription( );
if( count == 0 ) return;
List alertSubscriptionList = new ArrayList( );
for( int i = 0; i < count; i++ ) {
AlertSubscription subscription =
alertService.getAlertSubscription( i );
NotificationListener listener = configureNotificationListener(
subscription.getListenerConfig( ) );
NotificationFilter filter = configureNotificationFilter(
subscription.getFilterConfig( ) );
alertSubscriptionList.add( new AlertSubscriptionInfo(
subscription.getListenerConfig().getSubscribeListenerWith( ),
listener, filter ));
String monitorNames = subscription.getListenerConfig(
).getSubscribeListenerWith( );
if( logger.isLoggable( Level.FINE ) ) {
logger.log( Level.FINE,
"AlertConfigurator.configure monitorNames.." +
monitorNames );
}
StringTokenizer tokenizer = new StringTokenizer( monitorNames,
"," );
// If we are interested in listening to LogMBean event
// event as well. Subscribe it with an explicit call
// as LogMBean would've been registered already by now and
// will never recieve the LogMBean registered notification.
while( tokenizer.hasMoreTokens( ) ) {
String token = tokenizer.nextToken().trim();
if( token.equals( LOG_MBEAN_NAME ) ) {
LogMBean.getInstance( ).addNotificationListener(
listener, filter, null );
}
}
}
// Now, we have read all the domain.xml alert subscriptions.
// We can register a Notification Listener to listen to
// MBean registered event and then we can introspect the name
// to see if it matches to add the Listeners capable of
// emitting alerts.
MBeanRegistrationEventListener registrationListener =
new MBeanRegistrationEventListener( alertSubscriptionList );
readyForMBeanRegistrationEvent( registrationListener );
}
}
/**
* Initializes the NotificationListener based on ListenerConfig in
* domain.xml .
*/
private NotificationListener configureNotificationListener(
ListenerConfig listenerConfig )
{
Logger alertLogger = LogDomains.getAlertLogger( );
if( alertLogger.isLoggable( Level.FINE ) ) {
alertLogger.log( Level.FINE,
"ConfigureNotificationListener called with className ..." +
listenerConfig.getListenerClassName( ) );
}
NotificationListener listener = null;
try {
listener = (NotificationListener) instantiateAndConfigure(
listenerConfig.getListenerClassName( ),
listenerConfig.getElementProperty( ) );
} catch( Exception e ) {
new ErrorManager().error(
"Error In Notification Listener Config ", e,
ErrorManager.GENERIC_FAILURE );
}
return listener;
}
/**
* Initializes the NotificationFilter based on FilterConfig in domain.xml .
*/
private NotificationFilter configureNotificationFilter(
FilterConfig filterConfig )
{
String filterClassName = DEFAULT_FILTER_CLASS_NAME;
ElementProperty[] properties = null;
if( filterConfig != null ) {
filterClassName = filterConfig.getFilterClassName();
properties = filterConfig.getElementProperty();
}
NotificationFilter filter = null;
try {
filter = (NotificationFilter) instantiateAndConfigure(
filterClassName, properties );
} catch( Exception e ) {
new ErrorManager().error(
"Error In Notification Filter Config ", e,
ErrorManager.GENERIC_FAILURE );
}
return filter;
}
/**
* Utility method to set properties to the instantiated Object.
*/
private void setProperties( Object o, ElementProperty[] properties ) {
if( properties == null ) return;
Method[] methods = null;
try {
methods = getDeclaredMethods( o.getClass( ) );
for( int i = 0; i < properties.length; i++ ) {
ElementProperty property = properties[i];
String propertyName = property.getName( ).toLowerCase( );
String propertyValue = property.getValue( );
for( int j = 0; j < methods.length; j++ ) {
String methodName = methods[j].getName().toLowerCase();
if ( ( methodName.startsWith( "set" ) )
&& ( methodName.endsWith( propertyName ) ) )
{
Class[] parameterTypes = methods[j].getParameterTypes( );
if( parameterTypes.length != 1 ) {
new ErrorManager().error(
"Only one Parameter is allowed for the setter " +
" Method: " + methodName +
" has invalid signature", new Exception(),
ErrorManager.GENERIC_FAILURE );
}
String parameterType = parameterTypes[0].getName();
Object[] parameters = new Object[1];
if( parameterType.equals( "java.lang.String") ) {
parameters[0] = propertyValue;
} else if( parameterType.equals( "byte" ) ) {
parameters[0] =
new Byte( propertyValue.getBytes()[0]);
} else if( parameterType.equals( "int" ) ) {
parameters[0] = new Integer(propertyValue);
} else if( parameterType.equals( "float" ) ) {
parameters[0] = new Float(propertyValue);
} else if( parameterType.equals( "double") ) {
parameters[0] = new Double(propertyValue);
} else if( parameterType.equals( "char" ) ) {
parameters[0] =
new Character(propertyValue.charAt(0));
} else if( parameterType.equals("boolean") ) {
parameters[0] = new Boolean(propertyValue);
} else if( parameterType.equals("long") ) {
parameters[0] = new Long(propertyValue);
} else if( parameterType.equals("short") ) {
parameters[0] = new Short(propertyValue);
} else {
new ErrorManager().error(
"Only the basic primitive types can be set " +
"as properties to NotificationListener and " +
" NotificationFilter ", new Exception(),
ErrorManager.GENERIC_FAILURE );
continue;
}
methods[j].invoke( o, parameters );
}
}
}
} catch( Exception e ) {
new ErrorManager().error(
"Error While Setting properties to Notification Listener or " +
" Filter ", e, ErrorManager.GENERIC_FAILURE );
}
}
/**
* A Utility method to instantiate a class and set the properties.
*/
private Object instantiateAndConfigure( String className,
ElementProperty[] properties )
{
Logger alertLogger = LogDomains.getAlertLogger();
if( alertLogger.isLoggable( Level.FINE ) ) {
alertLogger.log( Level.FINE,
"instantiateAndConfigure called with className.." +
className );
}
Object o = getInstance( className );
if( ( o != null )
&&( properties != null ) )
{
if( alertLogger.isLoggable( Level.FINE ) ) {
alertLogger.log( Level.FINE,
"instantiateAndConfigure setting Properties.." );
}
setProperties( o, properties );
}
return o;
}
/**
* A Utility method to get an instance of the class.
* _REVISIT_: Check to see if there is a utility method to do this.
* If yes, this method can be taken out.
*/
private Object getInstance( final String className ) {
if( className == null ) return null;
return AccessController.doPrivileged( new PrivilegedAction() {
public Object run() {
try {
ClassLoader cl =
Thread.currentThread().getContextClassLoader();
if (cl == null)
cl = ClassLoader.getSystemClassLoader();
return Class.forName( className, true, cl).newInstance(); } catch( Exception e ) {
new ErrorManager().error(
"Error In Instantiating Class " + className, e,
ErrorManager.GENERIC_FAILURE );
}
return null;
}
}
);
}
/**
* Utility method to get the declared fields.
*/
private final Method[] getDeclaredMethods(final Class clz) {
return (Method[]) AccessController.doPrivileged(new PrivilegedAction() { public Object run() {
return clz.getDeclaredMethods();
}
});
}
/**
* Registers the MBeanRegistrationEventListener with MBean Server Delegate.
*/
private void readyForMBeanRegistrationEvent(
NotificationListener registrationListener )
{
try {
MBeanServer mbeanServer =
AdminService.getAdminService().getAdminContext(
).getMBeanServer();
mbeanServer.addNotificationListener(
new ObjectName( MBEAN_SERVER_DELEGATE_OBJECT_NAME ),
registrationListener, (NotificationFilter) null,(Object) null );
} catch( Exception e ) {
new ErrorManager().error(
"Error In registerning MBeanServerNotificationListener ", e,
ErrorManager.GENERIC_FAILURE );
}
}
}
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