001    /**
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements.  See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache License, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License.  You may obtain a copy of the License at
008     *
009     *      http://www.apache.org/licenses/LICENSE-2.0
010     *
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS,
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     * See the License for the specific language governing permissions and
015     * limitations under the License.
016     */
017    package org.apache.activemq.advisory;
018    
019    import java.util.EventObject;
020    
021    import javax.jms.Destination;
022    
023    import org.apache.activemq.command.ProducerId;
024    
025    /**
026     * An event when the number of producers on a given destination changes.
027     * 
028     * 
029     */
030    public abstract class ProducerEvent extends EventObject {
031        private static final long serialVersionUID = 2442156576867593780L;
032        private final Destination destination;
033        private final ProducerId producerId;
034        private final int producerCount;
035    
036        public ProducerEvent(ProducerEventSource source, Destination destination, ProducerId producerId, int producerCount) {
037            super(source);
038            this.destination = destination;
039            this.producerId = producerId;
040            this.producerCount = producerCount;
041        }
042    
043        public ProducerEventSource getAdvisor() {
044            return (ProducerEventSource) getSource();
045        }
046    
047        public Destination getDestination() {
048            return destination;
049        }
050    
051        /**
052         * Returns the current number of producers active at the time this advisory was sent.
053         * 
054         */
055        public int getProducerCount() {
056            return producerCount;
057        }
058    
059        public ProducerId getProducerId() {
060            return producerId;
061        }
062    
063        public abstract boolean isStarted();
064    }