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/* HttpServiceChangeHandler.java
* $Id: HttpServiceChangeHandler.java,v 1.4 2007/05/05 05:24:20 tcfujii Exp $
* $Revision: 1.4 $
* $Date: 2007/05/05 05:24:20 $
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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.MonitoringLevelListener;
import com.sun.enterprise.admin.monitor.registry.MonitoredObjectType;
import com.sun.enterprise.admin.monitor.registry.StatsHolder;
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 http service and related components like http-listener and virtual server.
* 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: 1.4 $
*/
class HttpServiceChangeHandler implements ChangeHandler {
private final ChangeHandler successor;
private final ValueListMap listeners;
private static final Logger logger = Logger.getLogger(AdminConstants.kLoggerName);
HttpServiceChangeHandler(ChangeHandler successor, ValueListMap listeners) {
this.successor = successor;
this.listeners = listeners;
}
public void handleChange(MonitoredObjectType t, MonitoringLevel from, MonitoringLevel to) {
if (isHttpServiceType(t)) {
handleChange(from, to, t);
}
else {
successor.handleChange(t, from, to);
}
}
private boolean isHttpServiceType(MonitoredObjectType t) {
return ( t == MonitoredObjectType.HTTP_LISTENER ||
t == MonitoredObjectType.VIRTUAL_SERVER ||
t == MonitoredObjectType.HTTP_SERVICE );
}
private void handleChange(MonitoringLevel from, MonitoringLevel to, MonitoredObjectType t) {
final Map lsnrs = (Map) listeners.get(t);
if (off2Low(from, to) || off2High(from, to)) {
if(lsnrs != null)
notifyListeners(from, to, t);
registerMBeans();
}
if (low2Off(from, to) || high2Off(from, to)) {
if(lsnrs != null)
notifyListeners(from, to, t);
else
unregisterMBeans();
}
if (low2High(from, to) || high2Low(from, to)) {
//currently do nothing.
}
}
private void notifyListeners(MonitoringLevel from, MonitoringLevel to, MonitoredObjectType t) {
logger.finer("DynamicReconfigurator: Now notifying the listeners for http service --- 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() {
final MonitoringRegistrationHelper registryImpl =
(MonitoringRegistrationHelper) MonitoringRegistrationHelper.getInstance();
//note that the above refers to the actual implementation rather than interface.
//registers MBeans pertaining to http-listeners
final Iterator iter = registryImpl.getHttpServiceNodes().iterator();
while (iter.hasNext()) {
final StatsHolder c = (StatsHolder) iter.next();
c.registerMBean();
logger.finer("DynamicReconfigurator: Now Registering MBean for --- " + c.getName());
}
}
private void unregisterMBeans() {
final MonitoringRegistrationHelper registryImpl =
(MonitoringRegistrationHelper) MonitoringRegistrationHelper.getInstance();
//note that the above refers to the actual implementation rather than interface.
final Iterator iter = registryImpl.getHttpServiceNodes().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 );
}
}