1 /* Reattore HTTP Server
2
3 Copyright (C) 2002 Michael Hope <michaelh@juju.net.nz>
4
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
9
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18
19 $Id: ByteBufferPool.java,v 1.7 2003/02/22 04:29:52 michaelh Exp $
20 */
21
22 package juju.reattore.io.impl;
23
24 import java.nio.ByteBuffer;
25 import java.util.*;
26
27 import juju.reattore.util.GaugeStat;
28
29 /*** A pool for a set of ByteBuffers. Primitive.
30
31 @todo Minor: Replace with library.
32 */
33 public class ByteBufferPool {
34
35 private static GaugeStat allocStat = new GaugeStat(ByteBufferPool.class, "Alloc");
36
37 private static List pool = new LinkedList();
38
39 /*** Allocate a buffer of at least minSize in size.
40
41 @param minSize The minimum capacity of the buffer.
42 @return A new, usable buffer.
43 */
44 public static ByteBuffer allocate(int minSize) {
45 allocStat.inc();
46
47 if (pool.size() > 0) {
48 for (Iterator i = pool.iterator(); i.hasNext();) {
49 ByteBuffer bb = (ByteBuffer)i.next();
50
51 if (bb.capacity() >= minSize) {
52 i.remove();
53
54 return bb;
55 }
56 }
57 }
58
59 /* Didn't find one so create */
60 return ByteBuffer.allocateDirect(minSize);
61 }
62
63 /*** Return a buffer to the pool.
64
65 @param bb The buffer to return.
66 */
67 public static void release(ByteBuffer bb) {
68 bb.clear();
69 pool.add(bb);
70
71 allocStat.dec();
72 }
73 }
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