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SPTRecommender.php
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1 <?PHP
2 #
3 # FILE: SPTRecommender.php
4 #
5 # Part of the Collection Workflow Integration System (CWIS)
6 # Copyright 2011-2013 Edward Almasy and Internet Scout Research Group
7 # http://scout.wisc.edu/cwis/
8 #
9
10 class SPTRecommender extends Recommender
11 {
12
16 public function __construct()
17 {
18 # set up recommender configuration values for SPT
19 $ItemTableName = "Resources";
20 $ItemIdFieldName = "ResourceId";
21 $RatingTableName = "ResourceRatings";
22 $UserIdFieldName = "UserId";
23 $RatingFieldName = "Rating";
24
25 # build field info from SPT metadata schema
26 $this->Schema = new MetadataSchema();
27 $Fields = $this->Schema->GetFields();
28 foreach ($Fields as $Field)
29 {
30 if ($Field->Enabled() && $Field->IncludeInKeywordSearch())
31 {
32 $FieldName = $Field->Name();
33 $FieldInfo[$FieldName]["DBFieldName"] = $Field->DBFieldName();
34 $FieldInfo[$FieldName]["Weight"] = $Field->SearchWeight();
35 switch ($Field->Type())
36 {
37 case MetadataSchema::MDFTYPE_TEXT:
38 case MetadataSchema::MDFTYPE_PARAGRAPH:
39 case MetadataSchema::MDFTYPE_USER:
40 case MetadataSchema::MDFTYPE_URL:
41 $FieldInfo[$FieldName]["FieldType"] =
42 Recommender::CONTENTFIELDTYPE_TEXT;
43 break;
44
45 case MetadataSchema::MDFTYPE_TREE:
46 case MetadataSchema::MDFTYPE_CONTROLLEDNAME:
47 case MetadataSchema::MDFTYPE_OPTION:
48 $FieldInfo[$FieldName]["FieldType"] =
49 Recommender::CONTENTFIELDTYPE_TEXT;
50 break;
51
52 case MetadataSchema::MDFTYPE_NUMBER:
53 case MetadataSchema::MDFTYPE_FLAG:
54 $FieldInfo[$FieldName]["FieldType"] =
55 Recommender::CONTENTFIELDTYPE_NUMERIC;
56 break;
57
58 case MetadataSchema::MDFTYPE_DATE:
59 $FieldInfo[$FieldName]["FieldType"] =
60 Recommender::CONTENTFIELDTYPE_DATERANGE;
61 break;
62
63 case MetadataSchema::MDFTYPE_TIMESTAMP:
64 $FieldInfo[$FieldName]["FieldType"] =
65 Recommender::CONTENTFIELDTYPE_DATE;
66 break;
67
68 case MetadataSchema::MDFTYPE_IMAGE:
69 # (for images we use their alt text)
70 $FieldInfo[$FieldName]["FieldType"] =
71 Recommender::CONTENTFIELDTYPE_TEXT;
72 break;
73
74 case MetadataSchema::MDFTYPE_FILE:
75 # (for files we use the file name)
76 $FieldInfo[$FieldName]["FieldType"] =
77 Recommender::CONTENTFIELDTYPE_TEXT;
78 break;
79 }
80 }
81 }
82
83 # create our own schema object and tell it to cache values
84 $this->Schema = new MetadataSchema();
85 $this->Schema->CacheData(TRUE);
86
87 # create a database connection for recommender to use
88 $DB = new Database();
89
90 # pass configuration info to real recommender object
91 parent::__construct($DB, $ItemTableName, $RatingTableName,
92 $ItemIdFieldName, $UserIdFieldName, $RatingFieldName,
93 $FieldInfo);
94 }
95
102 public function GetFieldValue($ItemId, $FieldName)
103 {
104 static $Resources;
105
106 # if resource not already loaded
107 if (!isset($Resources[$ItemId]))
108 {
109 # get resource object
110 $Resources[$ItemId] = new Resource($ItemId);
111
112 # if cached resource limit exceeded
113 if (count($Resources) > 100)
114 {
115 # dump oldest resource
116 reset($Resources);
117 list($DumpedItemId, $DumpedResources) = each($Resources);
118 unset($Resources[$DumpedItemId]);
119 }
120 }
121
122 # retrieve field value from resource object and return to caller
123 $FieldValue = $Resources[$ItemId]->Get($FieldName);
124 return $FieldValue;
125 }
126
133 public function QueueUpdateForItem($ItemOrItemId, $TaskPriority = NULL)
134 {
135 if (is_numeric($ItemOrItemId))
136 {
137 $ItemId = $ItemOrItemId;
138 $Item = new Resource($ItemId);
139 }
140 else
141 {
142 $Item = $ItemOrItemId;
143 $ItemId = $Item->Id();
144 }
145
146 # if no proirity was provided, use the default
147 if ($TaskPriority === NULL)
148 {
149 $TaskPriority = self::$TaskPriority;
150 }
151
152 $TaskDescription = "Update recommender data for"
153 ." <a href=\"r".$ItemId."\"><i>"
154 .$Item->GetMapped("Title")."</i></a>";
155 $GLOBALS["AF"]->QueueUniqueTask(array(__CLASS__, "RunUpdateForItem"),
156 array(intval($ItemId), 0), $TaskPriority);
157 }
158
164 public static function RunUpdateForItem($SourceItemId, $StartingIndex)
165 {
166 # check that resource still exists
167 $RFactory = new ResourceFactory();
168 if (!$RFactory->ItemExists($SourceItemId)) { return; }
169
170 # load recommender engine
171 static $Recommender;
172 if (!isset($Recommender)) { $Recommender = new SPTRecommender(); }
173
174 # if starting update for source item
175 if ($StartingIndex == 0)
176 {
177 # clear data for item
178 $Recommender->DropItem($SourceItemId);
179 }
180
181 # load array of item IDs and pare down to those in same schema as source item
182 $TargetItemIds = $Recommender->GetItemIds();
183 $SourceSchemaIds = $RFactory->GetItemIds();
184 $TargetItemIds = array_values(array_intersect(
185 $TargetItemIds, $SourceSchemaIds));
186 $TargetCount = count($TargetItemIds);
187
188 # while not last item ID and not out of time
189 for ($Index = $StartingIndex; $Index < $TargetCount; $Index++)
190 {
191 # if target ID points to non-temporary entry
192 if ($TargetItemIds[$Index] >= 0)
193 {
194 # update correlation for source item and current item
195 $StartTime = microtime(TRUE);
196 $Recommender->UpdateContentCorrelation(
197 $SourceItemId, $TargetItemIds[$Index]);
198 $ExecutionTime = microtime(TRUE) - $StartTime;
199
200 # clear all caches if memory has run low
201 if ($GLOBALS["AF"]->GetFreeMemory() < 8000000)
202 {
203 Database::Caching(FALSE);
204 Database::Caching(TRUE);
205 self::ClearCaches();
206 if (function_exists("gc_collect_cycles"))
207 {
208 gc_collect_cycles();
209 }
210 }
211
212 # bail out if out of memory or not enough time for another update
213 if (($GLOBALS["AF"]->GetSecondsBeforeTimeout() < ($ExecutionTime * 2))
214 || ($GLOBALS["AF"]->GetFreeMemory() < 8000000))
215 {
216 break;
217 }
218 }
219 }
220
221 # if all correlations completed for source item
222 if ($Index >= $TargetCount)
223 {
224 # periodically prune correlations if enough time remaining
225 if (($GLOBALS["AF"]->GetSecondsBeforeTimeout() > 20)
226 && (rand(1, 10) == 1))
227 {
228 $Recommender->PruneCorrelations();
229 }
230 }
231 else
232 {
233 # requeue updates for remaining items
234 $Item = new Resource($SourceItemId);
235 $TaskDescription = "Update recommender data for"
236 ." <a href=\"r".$SourceItemId."\"><i>"
237 .$Item->GetMapped("Title")."</i></a>";
238 $GLOBALS["AF"]->QueueUniqueTask(array(__CLASS__, "RunUpdateForItem"),
239 array((int)$SourceItemId, $Index),
240 ApplicationFramework::PRIORITY_LOW);
241 }
242 }
243
249 public static function SetUpdatePriority($NewPriority)
250 {
251 self::$TaskPriority = $NewPriority;
252 }
253
254 # ---- PRIVATE INTERFACE -------------------------------------------------
255
256 private $Schema;
257 private static $TaskPriority = ApplicationFramework::PRIORITY_BACKGROUND;
258 }
MetadataSchema\MDFTYPE_IMAGE
const MDFTYPE_IMAGE
Definition: MetadataSchema.php:31
Database\Caching
static Caching($NewSetting=NULL)
Get or set whether query result caching is currently enabled.
Definition: Database.php:235
MetadataSchema\MDFTYPE_TIMESTAMP
const MDFTYPE_TIMESTAMP
Definition: MetadataSchema.php:25
MetadataSchema\MDFTYPE_FILE
const MDFTYPE_FILE
Definition: MetadataSchema.php:32
MetadataSchema
Metadata schema (in effect a Factory class for MetadataField).
Definition: MetadataSchema.php:13
Recommender\CONTENTFIELDTYPE_DATE
const CONTENTFIELDTYPE_DATE
Definition: Recommender.php:18
Database
SQL database abstraction object with smart query caching.
Definition: Database.php:22
SPTRecommender\__construct
__construct()
SPTRecommender object constructor.
Definition: SPTRecommender.php:16
MetadataSchema\MDFTYPE_NUMBER
const MDFTYPE_NUMBER
Definition: MetadataSchema.php:23
SPTRecommender\GetFieldValue
GetFieldValue($ItemId, $FieldName)
Get value for a given field.
Definition: SPTRecommender.php:102
Recommender\CONTENTFIELDTYPE_NUMERIC
const CONTENTFIELDTYPE_NUMERIC
Definition: Recommender.php:16
MetadataSchema\MDFTYPE_TREE
const MDFTYPE_TREE
Definition: MetadataSchema.php:27
SPTRecommender
Definition: SPTRecommender.php:10
MetadataSchema\MDFTYPE_OPTION
const MDFTYPE_OPTION
Definition: MetadataSchema.php:29
MetadataSchema\MDFTYPE_FLAG
const MDFTYPE_FLAG
Definition: MetadataSchema.php:26
MetadataSchema\MDFTYPE_CONTROLLEDNAME
const MDFTYPE_CONTROLLEDNAME
Definition: MetadataSchema.php:28
PHP
PHP
Definition: RSSClient--Test.php:12
SPTRecommender\RunUpdateForItem
static RunUpdateForItem($SourceItemId, $StartingIndex)
Perform recommender db updates for a specified item (usually in the background)
Definition: SPTRecommender.php:164
SPTRecommender\QueueUpdateForItem
QueueUpdateForItem($ItemOrItemId, $TaskPriority=NULL)
Queue a background update for a specified item.
Definition: SPTRecommender.php:133
Recommender\CONTENTFIELDTYPE_TEXT
const CONTENTFIELDTYPE_TEXT
Definition: Recommender.php:15
MetadataSchema\MDFTYPE_PARAGRAPH
const MDFTYPE_PARAGRAPH
Definition: MetadataSchema.php:22
MetadataSchema\MDFTYPE_DATE
const MDFTYPE_DATE
Definition: MetadataSchema.php:24
Resource
Represents a "resource" in CWIS.
Definition: Resource.php:13
MetadataSchema\MDFTYPE_URL
const MDFTYPE_URL
Definition: MetadataSchema.php:33
SPTRecommender\SetUpdatePriority
static SetUpdatePriority($NewPriority)
Set the default priority for background tasks.
Definition: SPTRecommender.php:249
MetadataSchema\MDFTYPE_TEXT
const MDFTYPE_TEXT
Definition: MetadataSchema.php:21
MetadataSchema\MDFTYPE_USER
const MDFTYPE_USER
Definition: MetadataSchema.php:30
Recommender
Definition: Recommender.php:11
ResourceFactory
Factory for Resource objects.
Definition: ResourceFactory.php:13