ActiveMQ example source code file (ConsumerEvent.java)

This example ActiveMQ source code file (ConsumerEvent.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 - ActiveMQ tags/keywords

consumerevent, consumerevent, consumereventsource, consumereventsource, consumerid, consumerid, destination, destination, eventobject, util

The ActiveMQ ConsumerEvent.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.activemq.advisory;

import java.util.EventObject;

import javax.jms.Destination;

import org.apache.activemq.command.ConsumerId;

/**
 * An event when the number of consumers on a given destination changes.
 * 
 * 
 */
public abstract class ConsumerEvent extends EventObject {
    private static final long serialVersionUID = 2442156576867593780L;
    private final Destination destination;
    private final ConsumerId consumerId;
    private final int consumerCount;

    public ConsumerEvent(ConsumerEventSource source, Destination destination, ConsumerId consumerId, int consumerCount) {
        super(source);
        this.destination = destination;
        this.consumerId = consumerId;
        this.consumerCount = consumerCount;
    }

    public ConsumerEventSource getAdvisor() {
        return (ConsumerEventSource) getSource();
    }

    public Destination getDestination() {
        return destination;
    }

    /**
     * Returns the current number of consumers active at the time this advisory was sent.
     * 
     * Note that this is not the number of consumers active when the consumer started consuming.
     * It is usually more vital to know how many consumers there are now - rather than historically
     * how many there were when a consumer started. So if you create a {@link ConsumerListener}
     * after many consumers have started, you will receive a ConsumerEvent for each consumer. However the
     * {@link #getConsumerCount()} method will always return the current active consumer count on each event.
     */
    public int getConsumerCount() {
        return consumerCount;
    }

    public ConsumerId getConsumerId() {
        return consumerId;
    }

    public abstract boolean isStarted();
}