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Java > Open Source Codes > org > apache > activemq > broker > region > policy > PrefetchRatePendingMessageLimitStrategy


1 /**
2  *
3  * Licensed to the Apache Software Foundation (ASF) under one or more
4  * contributor license agreements. See the NOTICE file distributed with
5  * this work for additional information regarding copyright ownership.
6  * The ASF licenses this file to You under the Apache License, Version 2.0
7  * (the "License"); you may not use this file except in compliance with
8  * the License. You may obtain a copy of the License at
9  *
10  * http://www.apache.org/licenses/LICENSE-2.0
11  *
12  * Unless required by applicable law or agreed to in writing, software
13  * distributed under the License is distributed on an "AS IS" BASIS,
14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15  * See the License for the specific language governing permissions and
16  * limitations under the License.
17  */
18 package org.apache.activemq.broker.region.policy;
19
20 import org.apache.activemq.broker.region.TopicSubscription;
21
22 /**
23  * This PendingMessageLimitStrategy sets the maximum pending message limit value to be
24  * a multiplier of the prefetch limit of the subscription.
25  *
26  * @org.apache.xbean.XBean
27  *
28  * @version $Revision: 426366 $
29  */
30 public class PrefetchRatePendingMessageLimitStrategy implements PendingMessageLimitStrategy {
31
32     private double multiplier = 0.5;
33
34     public int getMaximumPendingMessageLimit(TopicSubscription subscription) {
35         int prefetchSize = subscription.getConsumerInfo().getPrefetchSize();
36         return (int) (prefetchSize * multiplier);
37     }
38
39     public double getMultiplier() {
40         return multiplier;
41     }
42
43     /**
44      * Sets the multiplier of the prefetch size which will be used to define the maximum number of pending
45      * messages for non-durable topics before messages are discarded.
46      */
47     public void setMultiplier(double rate) {
48         this.multiplier = rate;
49     }
50
51 }
52
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