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/* EjbContainerChangeHandler.java
* $Id: EjbContainerChangeHandler.java,v 1.5 2007/05/05 05:24:19 tcfujii Exp $
* $Revision: 1.5 $
* $Date: 2007/05/05 05:24:19 $
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package com.sun.enterprise.admin.monitor.registry.spi.reconfig;
import java.util.Iterator;
import java.util.Map;
import java.util.logging.Logger;
import com.sun.enterprise.admin.monitor.registry.MonitoringLevel;
import com.sun.enterprise.admin.monitor.registry.MonitoredObjectType;
import com.sun.enterprise.admin.monitor.registry.StatsHolder;
import com.sun.enterprise.admin.monitor.registry.MonitoringLevelListener;
import com.sun.enterprise.admin.monitor.registry.spi.ValueListMap;
import com.sun.enterprise.admin.monitor.registry.spi.MonitoringRegistrationHelper;
import com.sun.enterprise.admin.common.constant.AdminConstants;
/**
* Provides for dynamic reconfiguration of ejb container and related components like
* cache, pool, methods. This class decides the actions to take when there are
* changes to the monitoring level through administrative interfaces.
* @author <a href="mailto:Kedar.Mhaswade@sun.com">Kedar Mhaswade</a>
* @since S1AS8.0
* @version $Revision: 1.5 $
*/
class EjbContainerChangeHandler implements ChangeHandler {
private final ChangeHandler successor;
private final ValueListMap listeners;
private static final Logger logger = Logger.getLogger(AdminConstants.kLoggerName);
EjbContainerChangeHandler(ChangeHandler successor, ValueListMap listeners) {
this.successor = successor;
this.listeners = listeners;
}
public void handleChange(MonitoredObjectType t, MonitoringLevel from, MonitoringLevel to) {
if (isEjbContainerType(t)) {
handleChange(from, to, t);
}
else {
successor.handleChange(t, from, to);
}
}
private boolean isEjbContainerType(MonitoredObjectType t) {
return (
t == MonitoredObjectType.BEAN_CACHE ||
t == MonitoredObjectType.BEAN_METHOD ||
t == MonitoredObjectType.BEAN_POOL ||
t == MonitoredObjectType.ENTITY_BEAN ||
t == MonitoredObjectType.STATEFUL_BEAN ||
t == MonitoredObjectType.STATELESS_BEAN ||
t == MonitoredObjectType.MESSAGE_DRIVEN_BEAN );
}
private void handleChange(MonitoringLevel from, MonitoringLevel to, MonitoredObjectType t) {
if (off2Low(from, to) || off2High(from, to)) {
boolean includeMethods = false;
notifyListeners(from, to, t);
// register the ejb method mbeans only if the "to" level is HIGH
if(to == MonitoringLevel.HIGH)
includeMethods = true;
registerMBeans(includeMethods);
}
if (low2Off(from, to) || high2Off(from, to)) {
boolean includeMethods = false;
// need to include the ejb method mbeans, if the "from" level is HIGH
if(from == MonitoringLevel.HIGH)
includeMethods = true;
unregisterMBeans(includeMethods);
notifyListeners(from, to, t);
}
if (low2High(from, to)) {
// register the ejb method mbeans
notifyListeners(from, to, t);
registerMethodMBeans();
}
if (high2Low(from, to)) {
// unregister the ejb method mbeans
unregisterMethodMBeans();
notifyListeners(from, to, t);
}
}
private void notifyListeners(MonitoringLevel from, MonitoringLevel to, MonitoredObjectType t) {
logger.finer("DynamicReconfigurator: Now notifying the listeners for ejb stats --- from = " + from.toString() + " to = " + to.toString());
final Map l = (Map)listeners.get(t); // map of listeners;
if (l == null)
return; //do nothing
final Iterator it = l.keySet().iterator();
while (it.hasNext()) {
final MonitoringLevelListener ml = (MonitoringLevelListener)it.next();
ml.changeLevel(from, to, t);
}
}
private void registerMBeans(boolean includeMethods) {
final MonitoringRegistrationHelper registryImpl =
(MonitoringRegistrationHelper) MonitoringRegistrationHelper.getInstance();
//note that the above refers to the actual implementation rather than interface.
//registers MBeans pertaining to ejbs, pools, caches, methods
final Iterator iter = registryImpl.getEjbContainerNodes(includeMethods).iterator();
while (iter.hasNext()) {
final StatsHolder c = (StatsHolder) iter.next();
c.registerMBean();
logger.finer("DynamicReconfigurator: Now Registering MBean for --- " + c.getName());
}
}
private void unregisterMBeans(boolean includeMethods) {
final MonitoringRegistrationHelper registryImpl =
(MonitoringRegistrationHelper) MonitoringRegistrationHelper.getInstance();
//note that the above refers to the actual implementation rather than interface.
final Iterator iter = registryImpl.getEjbContainerNodes(includeMethods).iterator();
while (iter.hasNext()) {
final StatsHolder c = (StatsHolder) iter.next();
c.unregisterMBean();
logger.finer("DynamicReconfigurator: Now UnRegistering MBean for --- " + c.getName());
}
}
private void registerMethodMBeans() {
final MonitoringRegistrationHelper registryImpl =
(MonitoringRegistrationHelper) MonitoringRegistrationHelper.getInstance();
final Iterator iter = registryImpl.getEjbMethodNodes().iterator();
while (iter.hasNext()) {
final StatsHolder c = (StatsHolder) iter.next();
c.registerMBean();
logger.finer("DynamicReconfigurator: Now Registering MBean for --- " + c.getName());
}
}
private void unregisterMethodMBeans() {
final MonitoringRegistrationHelper registryImpl =
(MonitoringRegistrationHelper) MonitoringRegistrationHelper.getInstance();
final Iterator iter = registryImpl.getEjbMethodNodes().iterator();
while (iter.hasNext()) {
final StatsHolder c = (StatsHolder) iter.next();
c.unregisterMBean();
logger.finer("DynamicReconfigurator: Now UnRegistering MBean for --- " + c.getName());
}
}
private boolean off2Low(MonitoringLevel from, MonitoringLevel to) {
return ( from == MonitoringLevel.OFF && to == MonitoringLevel.LOW );
}
private boolean off2High(MonitoringLevel from, MonitoringLevel to) {
return ( from == MonitoringLevel.OFF && to == MonitoringLevel.HIGH );
}
private boolean low2Off(MonitoringLevel from, MonitoringLevel to) {
return ( from == MonitoringLevel.LOW && to == MonitoringLevel.OFF);
}
private boolean high2Off(MonitoringLevel from, MonitoringLevel to) {
return ( from == MonitoringLevel.HIGH && to == MonitoringLevel.OFF );
}
private boolean low2High(MonitoringLevel from, MonitoringLevel to) {
return ( from == MonitoringLevel.LOW && to == MonitoringLevel.HIGH);
}
private boolean high2Low(MonitoringLevel from, MonitoringLevel to) {
return ( from == MonitoringLevel.HIGH && to == MonitoringLevel.LOW );
}
}
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