Mercurial > hg > blitz_condensed
comparison src/com/go/trove/util/DeflaterPool.java @ 0:3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 21 Mar 2009 11:00:06 +0000 |
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-1:000000000000 | 0:3dc0c5604566 |
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1 /* ==================================================================== | |
2 * Trove - Copyright (c) 1997-2001 Walt Disney Internet Group | |
3 * ==================================================================== | |
4 * The Tea Software License, Version 1.1 | |
5 * | |
6 * Copyright (c) 2000 Walt Disney Internet Group. All rights reserved. | |
7 * | |
8 * Redistribution and use in source and binary forms, with or without | |
9 * modification, are permitted provided that the following conditions | |
10 * are met: | |
11 * | |
12 * 1. Redistributions of source code must retain the above copyright | |
13 * notice, this list of conditions and the following disclaimer. | |
14 * | |
15 * 2. Redistributions in binary form must reproduce the above copyright | |
16 * notice, this list of conditions and the following disclaimer in | |
17 * the documentation and/or other materials provided with the | |
18 * distribution. | |
19 * | |
20 * 3. The end-user documentation included with the redistribution, | |
21 * if any, must include the following acknowledgment: | |
22 * "This product includes software developed by the | |
23 * Walt Disney Internet Group (http://opensource.go.com/)." | |
24 * Alternately, this acknowledgment may appear in the software itself, | |
25 * if and wherever such third-party acknowledgments normally appear. | |
26 * | |
27 * 4. The names "Tea", "TeaServlet", "Kettle", "Trove" and "BeanDoc" must | |
28 * not be used to endorse or promote products derived from this | |
29 * software without prior written permission. For written | |
30 * permission, please contact opensource@dig.com. | |
31 * | |
32 * 5. Products derived from this software may not be called "Tea", | |
33 * "TeaServlet", "Kettle" or "Trove", nor may "Tea", "TeaServlet", | |
34 * "Kettle", "Trove" or "BeanDoc" appear in their name, without prior | |
35 * written permission of the Walt Disney Internet Group. | |
36 * | |
37 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED | |
38 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
39 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
40 * DISCLAIMED. IN NO EVENT SHALL THE WALT DISNEY INTERNET GROUP OR ITS | |
41 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | |
42 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
43 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | |
44 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY | |
45 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
46 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
47 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
48 * ==================================================================== | |
49 * | |
50 * For more information about Tea, please see http://opensource.go.com/. | |
51 */ | |
52 | |
53 package com.go.trove.util; | |
54 | |
55 import java.util.*; | |
56 | |
57 /****************************************************************************** | |
58 * Since {@link Deflater Deflaters} can be expensive to allocate, re-use them | |
59 * with this pool. | |
60 * | |
61 * @author Brian S O'Neill | |
62 * @version | |
63 * <!--$$Revision: 1.1 $-->, <!--$$JustDate:--> 01/06/14 <!-- $--> | |
64 */ | |
65 public class DeflaterPool { | |
66 private static final int LIMIT; | |
67 | |
68 private static List cPool; | |
69 private static List cNoWrapPool; | |
70 | |
71 static { | |
72 LIMIT = Integer.getInteger("com.go.trove.util.DeflaterPool.LIMIT", 8).intValue(); | |
73 } | |
74 | |
75 public static synchronized void clear() { | |
76 if (cPool != null) { | |
77 Iterator it = cPool.iterator(); | |
78 while (it.hasNext()) { | |
79 ((Deflater)it.next()).end(); | |
80 } | |
81 cPool = null; | |
82 } | |
83 if (cNoWrapPool != null) { | |
84 Iterator it = cNoWrapPool.iterator(); | |
85 while (it.hasNext()) { | |
86 ((Deflater)it.next()).end(); | |
87 } | |
88 cNoWrapPool = null; | |
89 } | |
90 } | |
91 | |
92 public static synchronized Deflater get(int level, boolean nowrap) { | |
93 List pool; | |
94 | |
95 if (nowrap) { | |
96 if ((pool = cNoWrapPool) == null) { | |
97 return new Deflater(level, true); | |
98 } | |
99 } | |
100 else { | |
101 if ((pool = cPool) == null) { | |
102 return new Deflater(level, false); | |
103 } | |
104 } | |
105 | |
106 if (pool.isEmpty()) { | |
107 return new Deflater(level, nowrap); | |
108 } | |
109 | |
110 Deflater d = (Deflater)pool.remove(pool.size() - 1); | |
111 d.setLevel(level); | |
112 d.setStrategy(Deflater.DEFAULT_STRATEGY); | |
113 return d; | |
114 } | |
115 | |
116 public static Deflater get(int level) { | |
117 return get(level, false); | |
118 } | |
119 | |
120 public static Deflater get() { | |
121 return get(Deflater.DEFAULT_COMPRESSION, false); | |
122 } | |
123 | |
124 public static synchronized void put(Deflater d) { | |
125 d.reset(); | |
126 List pool; | |
127 | |
128 if (d.isNoWrap()) { | |
129 if ((pool = cNoWrapPool) == null) { | |
130 pool = cNoWrapPool = new ArrayList(LIMIT); | |
131 } | |
132 } | |
133 else { | |
134 if ((pool = cPool) == null) { | |
135 pool = cPool = new ArrayList(LIMIT); | |
136 } | |
137 } | |
138 | |
139 if (pool.size() < LIMIT) { | |
140 pool.add(d); | |
141 } | |
142 else { | |
143 d.end(); | |
144 } | |
145 } | |
146 } |