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Source file | Conditionals | Statements | Methods | TOTAL | |||||||||||||||
Scheduler.java | 0% | 80% | 77.8% | 74.2% |
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1 | package org.drools.reteoo; | |
2 | ||
3 | /* | |
4 | * $Id: Scheduler.java,v 1.16 2005/02/02 00:23:22 mproctor Exp $ | |
5 | * | |
6 | * Copyright 2001-2003 (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 trademark of The Werken Company. | |
26 | * | |
27 | * 5. Due credit should be given to The Werken Company. (http://werken.com/) | |
28 | * | |
29 | * THIS SOFTWARE IS PROVIDED BY THE WERKEN COMPANY AND CONTRIBUTORS ``AS IS'' | |
30 | * AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
31 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
32 | * ARE DISCLAIMED. IN NO EVENT SHALL THE WERKEN COMPANY OR ITS CONTRIBUTORS BE | |
33 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
34 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
35 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
36 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
37 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
38 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
39 | * POSSIBILITY OF SUCH DAMAGE. | |
40 | * | |
41 | */ | |
42 | ||
43 | import java.util.Date; | |
44 | import java.util.HashMap; | |
45 | import java.util.Map; | |
46 | import java.util.Timer; | |
47 | import java.util.TimerTask; | |
48 | ||
49 | import org.drools.spi.AsyncExceptionHandler; | |
50 | import org.drools.spi.ConsequenceException; | |
51 | ||
52 | /** | |
53 | * Scheduler for rules requiring truth duration. | |
54 | * | |
55 | * @author <a href="mailto:bob@werken.com">bob mcwhirter </a> | |
56 | */ | |
57 | final class Scheduler | |
58 | { | |
59 | // ------------------------------------------------------------ | |
60 | // Class members | |
61 | // ------------------------------------------------------------ | |
62 | ||
63 | /** Singleton instance. */ | |
64 | private static final Scheduler INSTANCE = new Scheduler( ); | |
65 | ||
66 | // ------------------------------------------------------------ | |
67 | // Class methods | |
68 | // ------------------------------------------------------------ | |
69 | ||
70 | /** | |
71 | * Retrieve the singleton instance. | |
72 | * | |
73 | * @return The singleton instance. | |
74 | */ | |
75 | 4 | static Scheduler getInstance() |
76 | { | |
77 | 4 | return INSTANCE; |
78 | } | |
79 | ||
80 | // ------------------------------------------------------------ | |
81 | // Instance members | |
82 | // ------------------------------------------------------------ | |
83 | ||
84 | /** Alarm manager. */ | |
85 | private final Timer scheduler; | |
86 | ||
87 | /** Scheduled tasks. */ | |
88 | private final Map tasks; | |
89 | ||
90 | private AsyncExceptionHandler exceptionHandler; | |
91 | // ------------------------------------------------------------ | |
92 | // Constructors | |
93 | // ------------------------------------------------------------ | |
94 | ||
95 | /** | |
96 | * Construct. | |
97 | */ | |
98 | 1 | private Scheduler() |
99 | { | |
100 | 1 | this.scheduler = new Timer( true ); |
101 | ||
102 | 1 | this.tasks = new HashMap( ); |
103 | } | |
104 | ||
105 | /** | |
106 | * Schedule an agenda item. | |
107 | * | |
108 | * @param item | |
109 | * The item to schedule. | |
110 | * @param workingMemory | |
111 | * The working memory session. | |
112 | */ | |
113 | 2 | void scheduleAgendaItem(AgendaItem item, |
114 | WorkingMemoryImpl workingMemory) | |
115 | { | |
116 | 2 | Date now = new Date( ); |
117 | ||
118 | 2 | Date then = new Date( now.getTime( ) + (item.getRule( ).getDuration( ).getDuration( item.getTuple( ) ) * 1000) ); |
119 | ||
120 | 2 | TimerTask task = new AgendaItemFireListener( item, |
121 | workingMemory ); | |
122 | ||
123 | 2 | this.scheduler.schedule( task, |
124 | then ); | |
125 | ||
126 | 2 | this.tasks.put( item, |
127 | task ); | |
128 | } | |
129 | ||
130 | /** | |
131 | * Cancel an agenda item. | |
132 | * | |
133 | * @param item | |
134 | * The item to cancle. | |
135 | */ | |
136 | 0 | void cancelAgendaItem(AgendaItem item) |
137 | { | |
138 | 0 | TimerTask task = (TimerTask) this.tasks.remove( item ); |
139 | ||
140 | 0 | if ( task != null ) |
141 | { | |
142 | 0 | task.cancel( ); |
143 | } | |
144 | } | |
145 | ||
146 | 1 | void setAsyncExceptionHandler(AsyncExceptionHandler handler) |
147 | { | |
148 | 1 | this.exceptionHandler = handler; |
149 | } | |
150 | ||
151 | 1 | AsyncExceptionHandler getAsyncExceptionHandler() |
152 | { | |
153 | 1 | return this.exceptionHandler; |
154 | } | |
155 | ||
156 | 0 | public int size() |
157 | { | |
158 | 0 | return this.tasks.size(); |
159 | } | |
160 | ||
161 | /** | |
162 | * Fire listener. | |
163 | * | |
164 | * @author <a href="mailto:bob@eng.werken.com">bob mcwhirter </a> | |
165 | */ | |
166 | ||
167 | class AgendaItemFireListener extends TimerTask | |
168 | { | |
169 | // ------------------------------------------------------------ | |
170 | // Instance members | |
171 | // ------------------------------------------------------------ | |
172 | ||
173 | /** The agenda item. */ | |
174 | private AgendaItem item; | |
175 | ||
176 | /** The working-memory session. */ | |
177 | private WorkingMemoryImpl workingMemory; | |
178 | ||
179 | // ------------------------------------------------------------ | |
180 | // Constructors | |
181 | // ------------------------------------------------------------ | |
182 | ||
183 | /** | |
184 | * Construct. | |
185 | * | |
186 | * @param item | |
187 | * The agenda item. | |
188 | * @param workingMemory | |
189 | * The working memory session. | |
190 | */ | |
191 | 2 | AgendaItemFireListener(AgendaItem item, |
192 | WorkingMemoryImpl workingMemory) | |
193 | { | |
194 | 2 | this.item = item; |
195 | 2 | this.workingMemory = workingMemory; |
196 | } | |
197 | ||
198 | // ------------------------------------------------------------ | |
199 | // Instance methods | |
200 | // ------------------------------------------------------------ | |
201 | ||
202 | // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - | |
203 | // fr.dyade.jdring.AlarmListener | |
204 | // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - | |
205 | ||
206 | /** | |
207 | * Handle the firing of an alarm. | |
208 | */ | |
209 | 2 | public void run() |
210 | { | |
211 | 2 | try |
212 | { | |
213 | 2 | this.item.fire( this.workingMemory ); |
214 | 1 | Scheduler.this.tasks.remove( item ); |
215 | } | |
216 | catch ( ConsequenceException e ) | |
217 | { | |
218 | ||
219 | 1 | Scheduler.getInstance().getAsyncExceptionHandler().handleException( this.workingMemory, e); |
220 | } | |
221 | } | |
222 | } | |
223 | } |
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