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    1   /**
    2    * Licensed to the Apache Software Foundation (ASF) under one or more
    3    * contributor license agreements.  See the NOTICE file distributed with
    4    * this work for additional information regarding copyright ownership.
    5    * The ASF licenses this file to You under the Apache License, Version 2.0
    6    * (the "License"); you may not use this file except in compliance with
    7    * the License.  You may obtain a copy of the License at
    8    *
    9    *      http://www.apache.org/licenses/LICENSE-2.0
   10    *
   11    * Unless required by applicable law or agreed to in writing, software
   12    * distributed under the License is distributed on an "AS IS" BASIS,
   13    * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   14    * See the License for the specific language governing permissions and
   15    * limitations under the License.
   16    */
   17   package org.apache.activemq.broker.region.policy;
   18   
   19   import org.apache.activemq.broker.region.TopicSubscription;
   20   
   21   /**
   22    * This PendingMessageLimitStrategy sets the maximum pending message limit value to be
   23    * a multiplier of the prefetch limit of the subscription.
   24    * 
   25    * @org.apache.xbean.XBean
   26    * 
   27    * @version $Revision: 563921 $
   28    */
   29   public class PrefetchRatePendingMessageLimitStrategy implements PendingMessageLimitStrategy {
   30   
   31       private double multiplier = 0.5;
   32   
   33       public int getMaximumPendingMessageLimit(TopicSubscription subscription) {
   34           int prefetchSize = subscription.getConsumerInfo().getPrefetchSize();
   35           return (int) (prefetchSize * multiplier);
   36       }
   37   
   38       public double getMultiplier() {
   39           return multiplier;
   40       }
   41   
   42       /**
   43        * Sets the multiplier of the prefetch size which will be used to define the maximum number of pending
   44        * messages for non-durable topics before messages are discarded.
   45        */
   46       public void setMultiplier(double rate) {
   47           this.multiplier = rate;
   48       }
   49   
   50   }

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