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Source file | Conditionals | Statements | Methods | TOTAL | |||||||||||||||
RecencyConflictResolver.java | - | 100% | 100% | 100% |
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1 | package org.drools.conflict; | |
2 | ||
3 | /* | |
4 | * $Id: RecencyConflictResolver.java,v 1.5 2004/12/06 23:07:37 dbarnett Exp $ | |
5 | * | |
6 | * Copyright 2001-2004 (C) The Werken Company. All Rights Reserved. | |
7 | * | |
8 | * Redistribution and use of this software and associated documentation | |
9 | * ("Software"), with or without modification, are permitted provided that the | |
10 | * following conditions are met: | |
11 | * | |
12 | * 1. Redistributions of source code must retain copyright statements and | |
13 | * notices. Redistributions must also contain a copy of this document. | |
14 | * | |
15 | * 2. Redistributions in binary form must reproduce the above copyright notice, | |
16 | * this list of conditions and the following disclaimer in the documentation | |
17 | * and/or other materials provided with the distribution. | |
18 | * | |
19 | * 3. The name "drools" must not be used to endorse or promote products derived | |
20 | * from this Software without prior written permission of The Werken Company. | |
21 | * For written permission, please contact bob@werken.com. | |
22 | * | |
23 | * 4. Products derived from this Software may not be called "drools" nor may | |
24 | * "drools" appear in their names without prior written permission of The Werken | |
25 | * Company. "drools" is a registered trademark of The Werken Company. | |
26 | * | |
27 | * 5. Due credit should be given to The Werken Company. | |
28 | * (http://drools.werken.com/). | |
29 | * | |
30 | * THIS SOFTWARE IS PROVIDED BY THE WERKEN COMPANY AND CONTRIBUTORS ``AS IS'' | |
31 | * AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
32 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
33 | * ARE DISCLAIMED. IN NO EVENT SHALL THE WERKEN COMPANY OR ITS CONTRIBUTORS BE | |
34 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
35 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
36 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
37 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
38 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
39 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
40 | * POSSIBILITY OF SUCH DAMAGE. | |
41 | * | |
42 | */ | |
43 | ||
44 | import org.drools.spi.Activation; | |
45 | import org.drools.spi.ConflictResolver; | |
46 | ||
47 | /** | |
48 | * <code>ConflictResolver</code> that uses the mostRecentFactTimeStamp of | |
49 | * rules to resolve conflict. | |
50 | * | |
51 | * @see #getInstance | |
52 | * @see org.drools.spi.Tuple#getMostRecentFactTimeStamp | |
53 | * | |
54 | * @author <a href="mailto:bob@werken.com">bob mcwhirter </a> | |
55 | * @author <a href="mailto:simon@redhillconsulting.com.au">Simon Harris </a> | |
56 | */ | |
57 | public class RecencyConflictResolver extends AbstractConflictResolver | |
58 | { | |
59 | // ---------------------------------------------------------------------- | |
60 | // Class members | |
61 | // ---------------------------------------------------------------------- | |
62 | ||
63 | /** Singleton instance. */ | |
64 | private static final RecencyConflictResolver INSTANCE = new RecencyConflictResolver( ); | |
65 | ||
66 | // ---------------------------------------------------------------------- | |
67 | // Class methods | |
68 | // ---------------------------------------------------------------------- | |
69 | ||
70 | /** | |
71 | * Retrieve the singleton instance. | |
72 | * | |
73 | * @return The singleton instance. | |
74 | */ | |
75 | 25 | public static ConflictResolver getInstance( ) |
76 | { | |
77 | 25 | return INSTANCE; |
78 | } | |
79 | ||
80 | // ---------------------------------------------------------------------- | |
81 | // Constructors | |
82 | // ---------------------------------------------------------------------- | |
83 | ||
84 | /** | |
85 | * Construct. | |
86 | */ | |
87 | 21 | public RecencyConflictResolver( ) |
88 | { | |
89 | // intentionally left blank | |
90 | } | |
91 | ||
92 | // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - | |
93 | ||
94 | /** | |
95 | * @see ConflictResolver | |
96 | */ | |
97 | 46824 | public int compare( Activation lhs, |
98 | Activation rhs ) | |
99 | { | |
100 | 46824 | return ( int ) ( lhs.getTuple( ).getMostRecentFactTimeStamp( ) |
101 | - rhs.getTuple( ).getMostRecentFactTimeStamp( ) ); | |
102 | } | |
103 | } |
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