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Commons Modeler example source code file (FixedNotificationFilter.java)
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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