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Tomcat example source code file (

This example Tomcat source code file ( is included in the "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Tomcat tags/keywords

fixednotificationfilter, fixednotificationfilter, hashset, hashset, management, notificationfilter, notificationfilter, string, string, util

The Tomcat source code

 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.

package org.apache.tomcat.util.modeler;

import java.util.HashSet;


 * 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.
 * @author 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.
     * @param 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 (names) {
            return ((String[]) names.toArray(new String[names.size()]));

     * <p>Test whether notification enabled for this event.
     * Return true if:</p>
     * <ul>
     * <li>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</li>
     * </ul>
    public boolean isNotificationEnabled(Notification notification) {

        if (notification == null)
            return (false);
        synchronized (names) {
            if (names.size() < 1)
                return (true);
                return (names.contains(notification.getType()));



Other Tomcat examples (source code examples)

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