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Java > Open Source Codes > org > apache > activemq > memory > buffer > MessageBuffer


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
19 package org.apache.activemq.memory.buffer;
20
21 /**
22  * Represents a collection of MessageQueue instances which are all bound by the
23  * same memory buffer to fix the amount of RAM used to some uppper bound.
24  *
25  * @version $Revision: 1.1 $
26  */
27 public interface MessageBuffer {
28
29     public int getSize();
30
31     /**
32      * Creates a new message queue instance
33      */
34     public MessageQueue createMessageQueue();
35
36     /**
37      * After a message queue has changed we may need to perform some evictions
38      *
39      * @param delta
40      * @param queueSize
41      */
42     public void onSizeChanged(MessageQueue queue, int delta, int queueSize);
43
44     public void clear();
45
46 }
47
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