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Java > Open Source Codes > org > mr > core > util > byteable > IncomingByteBufferPool


1 /*
2  * Copyright 2002 by
3  * <a HREF="http://www.coridan.com">Coridan</a>
4  * <a HREF="mailto: support@coridan.com ">support@coridan.com</a>
5  *
6  * The contents of this file are subject to the Mozilla Public License Version
7  * 1.1 (the "License"); you may not use this file except in compliance with the
8  * License. You may obtain a copy of the License at
9  * http://www.mozilla.org/MPL/
10  *
11  * Software distributed under the License is distributed on an "AS IS" basis,
12  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
13  * for the specific language governing rights and limitations under the
14  * License.
15  *
16  * The Original Code is "MantaRay" (TM).
17  *
18  * The Initial Developer of the Original Code is Amir Shevat.
19  * Portions created by the Initial Developer are Copyright (C) 2006
20  * Coridan Inc. All Rights Reserved.
21  *
22  * Contributor(s): all the names of the contributors are added in the source
23  * code where applicable.
24  *
25  * Alternatively, the contents of this file may be used under the terms of the
26  * LGPL license (the "GNU LESSER GENERAL PUBLIC LICENSE"), in which case the
27  * provisions of LGPL are applicable instead of those above. If you wish to
28  * allow use of your version of this file only under the terms of the LGPL
29  * License and not to allow others to use your version of this file under
30  * the MPL, indicate your decision by deleting the provisions above and
31  * replace them with the notice and other provisions required by the LGPL.
32  * If you do not delete the provisions above, a recipient may use your version
33  * of this file under either the MPL or the GNU LESSER GENERAL PUBLIC LICENSE.
34  
35  *
36  * This library is free software; you can redistribute it and/or modify it
37  * under the terms of the MPL as stated above or under the terms of the GNU
38  * Lesser General Public License as published by the Free Software Foundation;
39  * either version 2.1 of the License, or any later version.
40  *
41  * This library is distributed in the hope that it will be useful, but WITHOUT
42  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
43  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
44  * License for more details.
45  */
46
47 /*
48  * Created on 22/02/2004
49  * Manta LTD
50  */
51 package org.mr.core.util.byteable;
52
53 import java.nio.ByteBuffer JavaDoc;
54
55 //import java.nio.HeapByteBuffer;
56
57
58
59 import org.mr.core.util.SynchronizedQueue;
60
61
62 /**
63  * ByteBufferPool butebuffer pool for incoming network traffic
64  * Created 22/02/2004
65  * Ver 1.0
66  * @author Amir Shevat
67  *
68  */
69 public class IncomingByteBufferPool implements ByteBufferFactory {
70     
71     
72     static final int SMALL_SIZE_BUFFER = 2048;
73     static final int MEDIUM_SIZE_BUFFER = 6120;
74     static final int LARGE_SIZE_BUFFER = 10240;
75     
76     private static IncomingByteBufferPool instance = new IncomingByteBufferPool();
77     private SynchronizedQueue small = new SynchronizedQueue();
78     private SynchronizedQueue medium = new SynchronizedQueue();
79     private SynchronizedQueue large = new SynchronizedQueue();
80     
81     
82     
83     public final static IncomingByteBufferPool getInstance(){
84         return instance;
85     }//getInstance
86
87
88     /**
89      * Constructor
90      */
91     private IncomingByteBufferPool() {
92         
93         for (int i = 0; i < ByteBufferPool.numInSmallPool; i++) {
94             small.enqueue(ByteBuffer.allocate(ByteBufferPool.SMALL_SIZE_BUFFER));
95         }//for
96
97         for (int i = 0; i < ByteBufferPool.numInMediumPool; i++) {
98             medium.enqueue(ByteBuffer.allocate(ByteBufferPool.MEDIUM_SIZE_BUFFER));
99         }//for
100
101         for (int i = 0; i < ByteBufferPool.numInLargePool; i++) {
102             large.enqueue(ByteBuffer.allocate(ByteBufferPool.LARGE_SIZE_BUFFER));
103         }//for
104 }//ByteBufferPool
105
106     
107     public final ByteBuffer JavaDoc getBuffer(int size){
108         
109         ByteBuffer JavaDoc result = null;
110         if(size <= ByteBufferPool.SMALL_SIZE_BUFFER){
111             result= (ByteBuffer JavaDoc)small.dequeue();
112         }else if(size <= ByteBufferPool.MEDIUM_SIZE_BUFFER){
113             result= (ByteBuffer JavaDoc)medium.dequeue();
114         }else if(size <= ByteBufferPool.LARGE_SIZE_BUFFER){
115             result= (ByteBuffer JavaDoc)large.dequeue();
116         }else{
117 // this buffer can not be found in pool return new
118 result= ByteBuffer.allocate(size);
119         }
120
121         result.limit(size);
122         return result;
123     }//getBuffer
124
125     
126     public final void release(ByteBuffer JavaDoc buffer){
127
128         // we do not need bad buffers here in our pool
129 if(buffer==null)
130             return;
131         
132         buffer.position(0);
133         buffer.limit(buffer.capacity());
134         buffer.mark();
135         int size = buffer.capacity();
136         
137         if(size == ByteBufferPool.SMALL_SIZE_BUFFER && small.size() < ByteBufferPool.numInSmallPool)
138             small.enqueue(buffer);
139         else if(size == ByteBufferPool.MEDIUM_SIZE_BUFFER)
140             medium.enqueue(buffer);
141         else if(size == ByteBufferPool.LARGE_SIZE_BUFFER)
142             large.enqueue(buffer);
143     }//release
144
145
146     /* (non-Javadoc)
147      * @see org.mr.core.util.byteable.ByteBufferFactory#getSmallBufferSize()
148      */
149     public int getSmallBufferSize() {
150         // TODO Auto-generated method stub
151 return ByteBufferPool.SMALL_SIZE_BUFFER;
152     }
153 }
154
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