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1
52
53 package com.go.trove.util;
54
55 import java.util.*;
56
57
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 }
147 |
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