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ActiveMQ example source code file (PendingMessageLimitStrategy.java)

This example ActiveMQ source code file (PendingMessageLimitStrategy.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

pendingmessagelimitstrategy, pendingmessagelimitstrategy

The ActiveMQ PendingMessageLimitStrategy.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.broker.region.policy;

import org.apache.activemq.broker.region.TopicSubscription;

/**
 * A pluggable strategy to calculate the maximum number of messages that are allowed to be pending on 
 * consumers (in addition to their prefetch sizes).
 * 
 * Once the limit is reached, non-durable topics can then start discarding old messages.
 * This allows us to keep dispatching messages to slow consumers while not blocking fast consumers
 * and discarding the messages oldest first.
 *  
 * 
 */
public interface PendingMessageLimitStrategy {

    /**
     * Calculate the maximum number of pending messages (in excess of the prefetch size)
     * for the given subscription
     * 
     * @return the maximum or -1 if there is no maximum
     */
    int getMaximumPendingMessageLimit(TopicSubscription subscription);

}

Other ActiveMQ examples (source code examples)

Here is a short list of links related to this ActiveMQ PendingMessageLimitStrategy.java source code file:

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