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Commons Modeler example source code file (FixedNotificationFilter.java)

This example Commons Modeler source code file (FixedNotificationFilter.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Commons Modeler tags/keywords

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

The Commons Modeler FixedNotificationFilter.java 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
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */


package org.apache.commons.modeler;


import java.util.HashSet;

import javax.management.Notification;
import javax.management.NotificationFilter;


/**
 * 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[]) {
        super();
    }

    /**
     * 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);
            else
                return (names.contains(notification.getType()));
        }

    }


}

Other Commons Modeler examples (source code examples)

Here is a short list of links related to this Commons Modeler FixedNotificationFilter.java source code file:

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