1 /*
2 * The contents of this file are subject to the BT "ZEUS" Open Source
3 * Licence (L77741), Version 1.0 (the "Licence"); you may not use this file
4 * except in compliance with the Licence. You may obtain a copy of the Licence
5 * from $ZEUS_INSTALL/licence.html or alternatively from
6 * http://www.labs.bt.com/projects/agents/zeus/licence.htm
7 *
8 * Except as stated in Clause 7 of the Licence, software distributed under the
9 * Licence is distributed WITHOUT WARRANTY OF ANY KIND, either express or
10 * implied. See the Licence for the specific language governing rights and
11 * limitations under the Licence.
12 *
13 * The Original Code is within the package zeus.*.
14 * The Initial Developer of the Original Code is British Telecommunications
15 * public limited company, whose registered office is at 81 Newgate Street,
16 * London, EC1A 7AJ, England. Portions created by British Telecommunications
17 * public limited company are Copyright 1996-9. All Rights Reserved.
18 *
19 * THIS NOTICE MUST BE INCLUDED ON ANY COPY OF THIS FILE
20 */
21
22 /*
23 * @(#)s0.java 1.03b
24 */
25
26
27 package zeus.actors.graphs;
28
29 import java.util.*;
30 import zeus.util.*;
31 import zeus.concepts.*;
32 import zeus.actors.*;
33 import zeus.actors.rtn.*;
34 import zeus.actors.rtn.util.*;
35
36 public class s0 extends Node {
37
38 // ST 050500 1.03bB node description due to CVB
39 private String node_desc = "do/analyse goal";
40
41
42 public final String getDesc()
43 {return node_desc;}
44
45
46 public final void setDesc(String node_desc)
47 {this.node_desc = node_desc;}
48 // ST 050500 1.03bE
49
50 public s0() {
51 super("s0");
52 }
53
54 protected int exec() {
55 // prepare output
56 Planner table = context.Planner();
57 Engine engine = context.getEngine();
58 GraphStruct gs = (GraphStruct) input;
59 //1.3
60 // debug ("before sync planner");
61 // Core.DEBUG(3, "entering sync -exec");
62 //synchronized (table) {//1.3
63 // debug ("before sync engine");
64 synchronized (engine) {
65
66 PlannerQueryStruct struct = table.canAchieve(gs.goal,gs.key);
67 gs.internal = struct.internal;
68 gs.external = struct.external;
69 gs.decompositions = struct.decompositions;
70 gs.timeout = struct.timeout;
71 }
72 //}
73 Core.DEBUG(3, "out of sync -exec");
74 output = input;
75 return OK;
76 }
77 //sync table?
78
79 protected void reset() {
80 // reset any state changed by exec()
81 Planner table = context.Planner();
82 Engine engine = context.getEngine();
83 Core.DEBUG(3, "entering sync -reset");
84 // synchronized (table) { //1.3
85 synchronized (engine) {
86
87 GraphStruct gs = (GraphStruct) input;
88 table.reject(gs.goal,gs.internal);
89 gs.internal = null;
90 gs.external = null;
91 gs.decompositions = null;
92 }
93 //}
94 Core.DEBUG(3, "out of sync - reset");
95 }
96
97
98 public void debug (String str) {
99 System.out.println("S0>> " + str);
100 }
101
102
103 }