Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
IdempotentSecureHashReceiver |
|
| 6.0;6 |
1 | /* | |
2 | * $Id: IdempotentSecureHashReceiver.java 7976 2007-08-21 14:26:13Z dirk.olmes $ | |
3 | * -------------------------------------------------------------------------------------- | |
4 | * Copyright (c) MuleSource, Inc. All rights reserved. http://www.mulesource.com | |
5 | * | |
6 | * The software in this package is published under the terms of the CPAL v1.0 | |
7 | * license, a copy of which has been included with this distribution in the | |
8 | * LICENSE.txt file. | |
9 | */ | |
10 | ||
11 | package org.mule.routing.inbound; | |
12 | ||
13 | import org.mule.transformers.simple.ByteArrayToHexString; | |
14 | import org.mule.transformers.simple.SerializableToByteArray; | |
15 | import org.mule.umo.MessagingException; | |
16 | import org.mule.umo.UMOEvent; | |
17 | import org.mule.umo.routing.RoutingException; | |
18 | import org.mule.umo.transformer.TransformerException; | |
19 | ||
20 | import java.security.MessageDigest; | |
21 | import java.security.NoSuchAlgorithmException; | |
22 | ||
23 | /** | |
24 | * <code>IdempotentSecureHashReceiver</code> ensures that only unique messages are | |
25 | * received by a component. It does this by calculating the SHA-256 hash of the | |
26 | * message itself. This provides a value with an infinitesimally small chance of a | |
27 | * collision. This can be used to filter message duplicates. Please keep in mind that | |
28 | * the hash is calculated over the entire byte array representing the message, so any | |
29 | * leading or trailing spaces or extraneous bytes (like padding) can produce | |
30 | * different hash values for the same semantic message content. Care should be taken | |
31 | * to ensure that messages do not contain extraneous bytes. This class is useful when | |
32 | * the message does not support unique identifiers. This implementation provides for | |
33 | * a persistent store of message hash values via the underlying file system and is | |
34 | * suitable in failover environments. | |
35 | */ | |
36 | ||
37 | 0 | public class IdempotentSecureHashReceiver extends IdempotentReceiver |
38 | { | |
39 | private static final String messageDigestAlgorithm = "SHA-256"; | |
40 | ||
41 | 0 | private final SerializableToByteArray objectToByteArray = new SerializableToByteArray(); |
42 | 0 | private final ByteArrayToHexString byteArrayToHexString = new ByteArrayToHexString(); |
43 | ||
44 | // @Override | |
45 | protected Object getIdForEvent(UMOEvent event) throws MessagingException | |
46 | { | |
47 | try | |
48 | { | |
49 | 0 | MessageDigest md = MessageDigest.getInstance(messageDigestAlgorithm); |
50 | 0 | return byteArrayToHexString.transform(md.digest((byte[]) objectToByteArray.transform(event.getMessage() |
51 | .getPayload()))); | |
52 | } | |
53 | 0 | catch (NoSuchAlgorithmException nsa) |
54 | { | |
55 | 0 | throw new RoutingException(event.getMessage(), event.getEndpoint(), nsa); |
56 | } | |
57 | 0 | catch (TransformerException te) |
58 | { | |
59 | 0 | throw new RoutingException(event.getMessage(), event.getEndpoint(), te); |
60 | } | |
61 | } | |
62 | } |