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Java > Open Source Codes > org > apache > activemq > transport > udp > DefaultBufferPool


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.transport.udp;
19
20 import java.nio.ByteBuffer JavaDoc;
21 import java.util.ArrayList JavaDoc;
22 import java.util.List JavaDoc;
23
24 /**
25  * A default implementation of {@link BufferPool} which keeps a pool of direct
26  * byte buffers.
27  *
28  * @version $Revision: 426366 $
29  */
30 public class DefaultBufferPool extends SimpleBufferPool implements ByteBufferPool {
31
32     private List JavaDoc buffers = new ArrayList JavaDoc();
33     private Object JavaDoc lock = new Object JavaDoc();
34
35     public DefaultBufferPool() {
36         super(true);
37     }
38
39     public DefaultBufferPool(boolean useDirect) {
40         super(useDirect);
41     }
42
43     public synchronized ByteBuffer JavaDoc borrowBuffer() {
44         synchronized (lock) {
45             int size = buffers.size();
46             if (size > 0) {
47                 return (ByteBuffer JavaDoc) buffers.remove(size - 1);
48             }
49         }
50         return createBuffer();
51     }
52
53     public void returnBuffer(ByteBuffer JavaDoc buffer) {
54         synchronized (lock) {
55             buffers.add(buffer);
56         }
57     }
58
59     public void start() throws Exception JavaDoc {
60     }
61
62     public void stop() throws Exception JavaDoc {
63         synchronized (lock) {
64             /*
65              * for (Iterator iter = buffers.iterator(); iter.hasNext();) {
66              * ByteBuffer buffer = (ByteBuffer) iter.next(); }
67              */
68             buffers.clear();
69         }
70     }
71
72 }
73
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