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WebContainerChangeHandler.javaAPI DocGlassfish v2 API7305Fri May 04 22:24:20 BST 2007com.sun.enterprise.admin.monitor.registry.spi.reconfig

WebContainerChangeHandler

public class WebContainerChangeHandler extends Object implements ChangeHandler
Provides for dynamic reconfiguration of web container and related components like servlets and web-module. 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: 1.4 $

Fields Summary
private final ChangeHandler
successor
private com.sun.enterprise.admin.monitor.registry.spi.MonitoringRegistrationHelper
registryImpl
private final com.sun.enterprise.admin.monitor.registry.spi.ValueListMap
listeners
private static final Logger
logger
Constructors Summary
WebContainerChangeHandler(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 (isWebContainerType(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)) {
			notifyListeners(from, to, t);
			registerMBeans();
		}
		if (low2Off(from, to) || high2Off(from, to)) {
			unregisterMBeans();
			notifyListeners(from, to, t);
		}
		if (low2High(from, to) || high2Low(from, to)) {
			//currently do nothing.
		}
	
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 booleanisWebContainerType(com.sun.enterprise.admin.monitor.registry.MonitoredObjectType t)

		return ( t == MonitoredObjectType.SERVLET		||
				 t == MonitoredObjectType.WEBMODULE);
	
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: Notifying the listeners for web container --- 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()

		final MonitoringRegistrationHelper registryImpl	= 
			(MonitoringRegistrationHelper) MonitoringRegistrationHelper.getInstance();
		//note that the above refers to the actual implementation rather than interface.

		//registers MBeans pertaining to web-container, servlets
		final Iterator iter = registryImpl.getWebContainerNodes().iterator();
		while (iter.hasNext()) {
			final StatsHolder c = (StatsHolder) iter.next();
			c.registerMBean();
			logger.finer("DynamicReconfigurator: Now Registering MBean for --- " + c.getName());
		}
	
private voidunregisterMBeans()

		final MonitoringRegistrationHelper registryImpl	= 
			(MonitoringRegistrationHelper) MonitoringRegistrationHelper.getInstance();
		//note that the above refers to the actual implementation rather than interface.

		final Iterator iter = registryImpl.getWebContainerNodes().iterator();
		while (iter.hasNext()) {
			final StatsHolder c = (StatsHolder) iter.next();
			c.unregisterMBean();
			logger.finer("DynamicReconfigurator: Now UnRegistering MBean for --- " + c.getName());
		}