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EjbContainerChangeHandler.javaAPI DocGlassfish v2 API8966Fri May 04 22:24:20 BST 2007com.sun.enterprise.admin.monitor.registry.spi.reconfig

EjbContainerChangeHandler

public class EjbContainerChangeHandler extends Object implements ChangeHandler
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
Kedar Mhaswade
since
S1AS8.0
version
$Revision: 1.5 $

Fields Summary
private final ChangeHandler
successor
private final com.sun.enterprise.admin.monitor.registry.spi.ValueListMap
listeners
private static final Logger
logger
Constructors Summary
EjbContainerChangeHandler(ChangeHandler successor, com.sun.enterprise.admin.monitor.registry.spi.ValueListMap listeners)


	    
		this.successor	= successor;
		this.listeners	= listeners;
	
Methods Summary
public voidhandleChange(com.sun.enterprise.admin.monitor.registry.MonitoredObjectType t, com.sun.enterprise.admin.monitor.registry.MonitoringLevel from, com.sun.enterprise.admin.monitor.registry.MonitoringLevel to)

		if (isEjbContainerType(t)) {
			handleChange(from, to, t);
		}
		else {
			successor.handleChange(t, from, to);
		}
	
private voidhandleChange(com.sun.enterprise.admin.monitor.registry.MonitoringLevel from, com.sun.enterprise.admin.monitor.registry.MonitoringLevel to, com.sun.enterprise.admin.monitor.registry.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 booleanhigh2Low(com.sun.enterprise.admin.monitor.registry.MonitoringLevel from, com.sun.enterprise.admin.monitor.registry.MonitoringLevel to)

		return ( from == MonitoringLevel.HIGH && to == MonitoringLevel.LOW );
	
private booleanhigh2Off(com.sun.enterprise.admin.monitor.registry.MonitoringLevel from, com.sun.enterprise.admin.monitor.registry.MonitoringLevel to)

 
		return ( from == MonitoringLevel.HIGH && to == MonitoringLevel.OFF );
	
private booleanisEjbContainerType(com.sun.enterprise.admin.monitor.registry.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 booleanlow2High(com.sun.enterprise.admin.monitor.registry.MonitoringLevel from, com.sun.enterprise.admin.monitor.registry.MonitoringLevel to)

 
		return ( from == MonitoringLevel.LOW && to == MonitoringLevel.HIGH);
	
private booleanlow2Off(com.sun.enterprise.admin.monitor.registry.MonitoringLevel from, com.sun.enterprise.admin.monitor.registry.MonitoringLevel to)

 
		return ( from == MonitoringLevel.LOW && to == MonitoringLevel.OFF);
	
private voidnotifyListeners(com.sun.enterprise.admin.monitor.registry.MonitoringLevel from, com.sun.enterprise.admin.monitor.registry.MonitoringLevel to, com.sun.enterprise.admin.monitor.registry.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 booleanoff2High(com.sun.enterprise.admin.monitor.registry.MonitoringLevel from, com.sun.enterprise.admin.monitor.registry.MonitoringLevel to)

 
		return ( from == MonitoringLevel.OFF && to == MonitoringLevel.HIGH );
	
private booleanoff2Low(com.sun.enterprise.admin.monitor.registry.MonitoringLevel from, com.sun.enterprise.admin.monitor.registry.MonitoringLevel to)

 
		return ( from == MonitoringLevel.OFF && to == MonitoringLevel.LOW );
	
private voidregisterMBeans(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 voidregisterMethodMBeans()

		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 voidunregisterMBeans(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 voidunregisterMethodMBeans()

		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());
		}