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package org.apache.tomcat.util.modeler;
Special NotificationFilter that allows modeler to optimize its notifications. This class is immutable - after you construct it it'll filter based on a fixed set of notification names. The JMX specification requires the filters to be called before the notifications are sent. We can call this filter well in advance, when the listener is added. Based on the result we can maintain separate channels for each notification - and reduce the overhead.

Costin Manolache
public class FixedNotificationFilter implements NotificationFilter {

The set of attribute names that are accepted by this filter. If this list is empty, all attribute names are accepted.
    private HashSet names = new HashSet();
    String namesA[]=null;

Construct a new filter that accepts only the specified notification names.

names Names of the notification types
    public FixedNotificationFilter(String names[]) {

Return the set of names that are accepted by this filter. If this filter accepts all attribute names, a zero length array will be returned.
    public String[] getNames() {
        synchronized () {
            return ((String[]) .toArray(new String[.size()]));


Test whether notification enabled for this event. Return true if:

  • Either the set of accepted names is empty (implying that all attribute names are of interest) or the set of accepted names includes the name of the attribute in this notification
    public boolean isNotificationEnabled(Notification notification) {
        if (notification == null)
            return (false);
        synchronized () {
            if (.size() < 1)
                return (true);
                return (.contains(notification.getType()));
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