1 |
| |
2 |
| |
3 |
| |
4 |
| |
5 |
| package com.opensymphony.oscache.plugins.diskpersistence; |
6 |
| |
7 |
| import com.opensymphony.oscache.base.Config; |
8 |
| import com.opensymphony.oscache.base.persistence.PersistenceListener; |
9 |
| |
10 |
| import java.security.MessageDigest; |
11 |
| import java.security.NoSuchAlgorithmException; |
12 |
| |
13 |
| |
14 |
| |
15 |
| |
16 |
| |
17 |
| |
18 |
| |
19 |
| |
20 |
| |
21 |
| |
22 |
| public class HashDiskPersistenceListener extends AbstractDiskPersistenceListener { |
23 |
| public final static String HASH_ALGORITHM_KEY = "cache.persistence.disk.hash.algorithm"; |
24 |
| public final static String DEFAULT_HASH_ALGORITHM = "MD5"; |
25 |
| protected MessageDigest md = null; |
26 |
| |
27 |
| |
28 |
| |
29 |
| |
30 |
| |
31 |
| |
32 |
0
| public PersistenceListener configure(Config config) {
|
33 |
0
| try {
|
34 |
0
| if (config.getProperty(HashDiskPersistenceListener.HASH_ALGORITHM_KEY) != null) {
|
35 |
0
| try {
|
36 |
0
| md = MessageDigest.getInstance(config.getProperty(HashDiskPersistenceListener.HASH_ALGORITHM_KEY));
|
37 |
| } catch (NoSuchAlgorithmException e) { |
38 |
0
| md = MessageDigest.getInstance(HashDiskPersistenceListener.DEFAULT_HASH_ALGORITHM);
|
39 |
| } |
40 |
| } else { |
41 |
0
| md = MessageDigest.getInstance(HashDiskPersistenceListener.DEFAULT_HASH_ALGORITHM);
|
42 |
| } |
43 |
| } catch (NoSuchAlgorithmException e) { |
44 |
0
| e.printStackTrace();
|
45 |
0
| throw new RuntimeException("No hash algorithm available for disk persistence", e);
|
46 |
| } |
47 |
| |
48 |
0
| return super.configure(config);
|
49 |
| } |
50 |
| |
51 |
| |
52 |
| |
53 |
| |
54 |
| |
55 |
| |
56 |
| |
57 |
| |
58 |
0
| protected synchronized char[] getCacheFileName(String key) {
|
59 |
0
| if ((key == null) || (key.length() == 0)) {
|
60 |
0
| throw new IllegalArgumentException("Invalid key '" + key + "' specified to getCacheFile.");
|
61 |
| } |
62 |
| |
63 |
0
| byte[] digest = md.digest(key.getBytes());
|
64 |
| |
65 |
0
| return byteArrayToHexString(digest).toCharArray();
|
66 |
| } |
67 |
| |
68 |
| |
69 |
| |
70 |
| |
71 |
| |
72 |
| |
73 |
| |
74 |
0
| static String byteArrayToHexString(byte[] in) {
|
75 |
0
| if ((in == null) || (in.length <= 0)) {
|
76 |
0
| return null;
|
77 |
| } |
78 |
| |
79 |
0
| StringBuffer out = new StringBuffer(in.length * 2);
|
80 |
| |
81 |
0
| for (int i = 0; i < in.length; i++) {
|
82 |
0
| byte ch = (byte) (in[i] & 0xF0);
|
83 |
0
| ch = (byte) (ch >>> 4);
|
84 |
| |
85 |
| |
86 |
0
| ch = (byte) (ch & 0x0F);
|
87 |
| |
88 |
| |
89 |
0
| out.append(PSEUDO[(int) ch]);
|
90 |
0
| ch = (byte) (in[i] & 0x0F);
|
91 |
0
| out.append(PSEUDO[(int) ch]);
|
92 |
0
| i++;
|
93 |
| } |
94 |
| |
95 |
0
| return out.toString();
|
96 |
| } |
97 |
| |
98 |
| static final String[] PSEUDO = { |
99 |
| "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "A", "B", "C", "D", |
100 |
| "E", "F" |
101 |
| }; |
102 |
| |
103 |
| } |