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ad47bd4c RK |
1 | /* |
2 | * This file is part of DisOrder | |
3 | * Copyright (C) 2008 Richard Kettlewell | |
4 | * | |
e7eb3a27 | 5 | * This program is free software: you can redistribute it and/or modify |
ad47bd4c | 6 | * it under the terms of the GNU General Public License as published by |
e7eb3a27 | 7 | * the Free Software Foundation, either version 3 of the License, or |
ad47bd4c RK |
8 | * (at your option) any later version. |
9 | * | |
e7eb3a27 RK |
10 | * This program is distributed in the hope that it will be useful, |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
ad47bd4c | 15 | * You should have received a copy of the GNU General Public License |
e7eb3a27 | 16 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
ad47bd4c | 17 | */ |
132a5a4a RK |
18 | /** @file disobedience/lookup.c |
19 | * @brief Disobedience server lookups and caching | |
20 | */ | |
ad47bd4c RK |
21 | #include "disobedience.h" |
22 | ||
23 | static int namepart_lookups_outstanding; | |
24 | static const struct cache_type cachetype_string = { 3600 }; | |
25 | static const struct cache_type cachetype_integer = { 3600 }; | |
26 | ||
27 | /** @brief Called when a namepart lookup has completed or failed | |
28 | * | |
29 | * When there are no lookups in flight a redraw is provoked. This might well | |
30 | * provoke further lookups. | |
31 | */ | |
32 | static void namepart_completed_or_failed(void) { | |
33 | --namepart_lookups_outstanding; | |
34 | if(!namepart_lookups_outstanding) | |
35 | /* When all lookups complete, we update any displays that care */ | |
36 | event_raise("lookups-completed", 0); | |
37 | } | |
38 | ||
39 | /** @brief Called when a namepart lookup has completed */ | |
abf99697 | 40 | static void namepart_completed(void *v, const char *err, const char *value) { |
ad47bd4c | 41 | D(("namepart_completed")); |
abf99697 RK |
42 | if(err) { |
43 | gtk_label_set_text(GTK_LABEL(report_label), err); | |
ad47bd4c RK |
44 | value = "?"; |
45 | } | |
46 | const char *key = v; | |
47 | ||
48 | cache_put(&cachetype_string, key, value); | |
49 | namepart_completed_or_failed(); | |
50 | } | |
51 | ||
52 | /** @brief Called when a length lookup has completed */ | |
abf99697 | 53 | static void length_completed(void *v, const char *err, long l) { |
ad47bd4c | 54 | D(("length_completed")); |
abf99697 RK |
55 | if(err) { |
56 | gtk_label_set_text(GTK_LABEL(report_label), err); | |
ad47bd4c RK |
57 | l = -1; |
58 | } | |
59 | const char *key = v; | |
60 | long *value; | |
61 | ||
62 | D(("namepart_completed")); | |
63 | value = xmalloc(sizeof *value); | |
64 | *value = l; | |
65 | cache_put(&cachetype_integer, key, value); | |
66 | namepart_completed_or_failed(); | |
67 | } | |
68 | ||
69 | /** @brief Arrange to fill in a namepart cache entry */ | |
70 | static void namepart_fill(const char *track, | |
71 | const char *context, | |
72 | const char *part, | |
73 | const char *key) { | |
74 | D(("namepart_fill %s %s %s %s", track, context, part, key)); | |
ad47bd4c RK |
75 | ++namepart_lookups_outstanding; |
76 | D(("namepart_lookups_outstanding -> %d\n", namepart_lookups_outstanding)); | |
77 | disorder_eclient_namepart(client, namepart_completed, | |
78 | track, context, part, (void *)key); | |
79 | } | |
80 | ||
81 | /** @brief Look up a namepart | |
82 | * @param track Track name | |
83 | * @param context Context | |
84 | * @param part Name part | |
ad47bd4c RK |
85 | * |
86 | * If it is in the cache then just return its value. If not then look it up | |
87 | * and arrange for the queues to be updated when its value is available. */ | |
88 | const char *namepart(const char *track, | |
89 | const char *context, | |
90 | const char *part) { | |
91 | char *key; | |
92 | const char *value; | |
93 | ||
94 | D(("namepart %s %s %s", track, context, part)); | |
95 | byte_xasprintf(&key, "namepart context=%s part=%s track=%s", | |
96 | context, part, track); | |
97 | value = cache_get(&cachetype_string, key); | |
98 | if(!value) { | |
99 | D(("deferring...")); | |
100 | namepart_fill(track, context, part, key); | |
101 | value = "?"; | |
102 | } | |
103 | return value; | |
104 | } | |
105 | ||
106 | /** @brief Called from @ref disobedience/properties.c when we know a name part has changed */ | |
107 | void namepart_update(const char *track, | |
108 | const char *context, | |
109 | const char *part) { | |
110 | char *key; | |
111 | ||
112 | byte_xasprintf(&key, "namepart context=%s part=%s track=%s", | |
113 | context, part, track); | |
114 | /* Only refetch if it's actually in the cache. */ | |
115 | if(cache_get(&cachetype_string, key)) | |
116 | namepart_fill(track, context, part, key); | |
117 | } | |
118 | ||
119 | /** @brief Look up a track length | |
120 | * | |
121 | * If it is in the cache then just return its value. If not then look it up | |
122 | * and arrange for the queues to be updated when its value is available. */ | |
123 | long namepart_length(const char *track) { | |
124 | char *key; | |
125 | const long *value; | |
126 | ||
127 | D(("getlength %s", track)); | |
128 | byte_xasprintf(&key, "length track=%s", track); | |
129 | value = cache_get(&cachetype_integer, key); | |
130 | if(value) | |
131 | return *value; | |
132 | D(("deferring..."));; | |
133 | ++namepart_lookups_outstanding; | |
134 | D(("namepart_lookups_outstanding -> %d\n", namepart_lookups_outstanding)); | |
135 | disorder_eclient_length(client, length_completed, track, key); | |
136 | return -1; | |
137 | } | |
138 | ||
68110302 RK |
139 | /** @brief Resolve a track name |
140 | * | |
141 | * Returns the supplied track name if it doesn't have the answer yet. | |
142 | */ | |
143 | char *namepart_resolve(const char *track) { | |
144 | char *key; | |
145 | ||
146 | byte_xasprintf(&key, "resolve track=%s", track); | |
147 | const char *value = cache_get(&cachetype_string, key); | |
148 | if(!value) { | |
149 | D(("deferring...")); | |
150 | ++namepart_lookups_outstanding; | |
151 | D(("namepart_lookups_outstanding -> %d\n", namepart_lookups_outstanding)); | |
152 | disorder_eclient_resolve(client, namepart_completed, | |
153 | track, (void *)key); | |
154 | value = track; | |
155 | } | |
156 | return xstrdup(value); | |
157 | } | |
ad47bd4c RK |
158 | |
159 | /* | |
160 | Local Variables: | |
161 | c-basic-offset:2 | |
162 | comment-column:40 | |
163 | fill-column:79 | |
164 | indent-tabs-mode:nil | |
165 | End: | |
166 | */ |