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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
84 $this->Schema = new MetadataSchema();
85
86 # create a database connection for recommender to use
87 $DB = new Database();
88
89 # pass configuration info to real recommender object
90 parent::__construct($DB, $ItemTableName, $RatingTableName,
91 $ItemIdFieldName, $UserIdFieldName, $RatingFieldName,
92 $FieldInfo);
93 }
94
101 public function GetFieldValue($ItemId, $FieldName)
102 {
103 static $Resources;
104
105 # if resource not already loaded
106 if (!isset($Resources[$ItemId]))
107 {
108 # get resource object
109 $Resources[$ItemId] = new Resource($ItemId);
110
111 # if cached resource limit exceeded
112 if (count($Resources) > 100)
113 {
114 # dump oldest resource
115 reset($Resources);
116 list($DumpedItemId, $DumpedResources) = each($Resources);
117 unset($Resources[$DumpedItemId]);
118 }
119 }
120
121 # retrieve field value from resource object and return to caller
122 $FieldValue = $Resources[$ItemId]->Get($FieldName);
123 return $FieldValue;
124 }
125
132 public function QueueUpdateForItem($ItemOrItemId, $TaskPriority = NULL)
133 {
134 if (is_numeric($ItemOrItemId))
135 {
136 $ItemId = $ItemOrItemId;
137 $Item = new Resource($ItemId);
138 }
139 else
140 {
141 $Item = $ItemOrItemId;
142 $ItemId = $Item->Id();
143 }
144
145 # if no proirity was provided, use the default
146 if ($TaskPriority === NULL)
147 {
148 $TaskPriority = self::$TaskPriority;
149 }
150
151 $TaskDescription = "Update recommender data for"
152 ." <a href=\"r".$ItemId."\"><i>"
153 .$Item->GetMapped("Title")."</i></a>";
154 $GLOBALS["AF"]->QueueUniqueTask(array(__CLASS__, "RunUpdateForItem"),
155 array(intval($ItemId), 0), $TaskPriority, $TaskDescription);
156 }
157
163 public static function RunUpdateForItem($SourceItemId, $StartingIndex)
164 {
165 # check that resource still exists
166 $RFactory = new ResourceFactory();
167 if (!$RFactory->ItemExists($SourceItemId)) { return; }
168
169 # load recommender engine
170 static $Recommender;
171 if (!isset($Recommender)) { $Recommender = new SPTRecommender(); }
172
173 # if starting update for source item
174 if ($StartingIndex == 0)
175 {
176 # clear data for item
177 $Recommender->DropItem($SourceItemId);
178 }
179
180 # load array of item IDs and pare down to those in same schema as source item
181 $TargetItemIds = $Recommender->GetItemIds();
182 $SourceSchemaIds = $RFactory->GetItemIds();
183 $TargetItemIds = array_values(array_intersect(
184 $TargetItemIds, $SourceSchemaIds));
185 $TargetCount = count($TargetItemIds);
186
187 # while not last item ID and not out of time
188 for ($Index = $StartingIndex; $Index < $TargetCount; $Index++)
189 {
190 # if target ID points to non-temporary entry
191 if ($TargetItemIds[$Index] >= 0)
192 {
193 # update correlation for source item and current item
194 $StartTime = microtime(TRUE);
195 $Recommender->UpdateContentCorrelation(
196 $SourceItemId, $TargetItemIds[$Index]);
197 $ExecutionTime = microtime(TRUE) - $StartTime;
198
199 # clear all caches if memory has run low
200 if ($GLOBALS["AF"]->GetFreeMemory() < 8000000)
201 {
202 Database::Caching(FALSE);
203 Database::Caching(TRUE);
204 self::ClearCaches();
205 if (function_exists("gc_collect_cycles"))
206 {
207 gc_collect_cycles();
208 }
209 }
210
211 # bail out if out of memory or not enough time for another update
212 if (($GLOBALS["AF"]->GetSecondsBeforeTimeout() < ($ExecutionTime * 2))
213 || ($GLOBALS["AF"]->GetFreeMemory() < 8000000))
214 {
215 break;
216 }
217 }
218 }
219
220 # if all correlations completed for source item
221 if ($Index >= $TargetCount)
222 {
223 # periodically prune correlations if enough time remaining
224 if (($GLOBALS["AF"]->GetSecondsBeforeTimeout() > 20)
225 && (rand(1, 10) == 1))
226 {
227 $Recommender->PruneCorrelations();
228 }
229 }
230 else
231 {
232 # requeue updates for remaining items
233 $Item = new Resource($SourceItemId);
234 $TaskDescription = "Update recommender data for"
235 ." <a href=\"r".$SourceItemId."\"><i>"
236 .$Item->GetMapped("Title")."</i></a>";
237 $GLOBALS["AF"]->QueueUniqueTask(array(__CLASS__, "RunUpdateForItem"),
238 array((int)$SourceItemId, $Index),
239 ApplicationFramework::PRIORITY_LOW);
240 }
241 }
242
248 public static function SetUpdatePriority($NewPriority)
249 {
250 self::$TaskPriority = $NewPriority;
251 }
252
253 # ---- PRIVATE INTERFACE -------------------------------------------------
254
255 private $Schema;
256 private static $TaskPriority = ApplicationFramework::PRIORITY_BACKGROUND;
257 }
MetadataSchema\MDFTYPE_IMAGE
const MDFTYPE_IMAGE
Definition: MetadataSchema.php:31
Database\Caching
static Caching($NewSetting=NULL)
Get or set whether query result caching is currently enabled.
Definition: Database.php:259
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:21
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, $FieldName)
Get value for a given field.
Definition: SPTRecommender.php:101
Recommender\CONTENTFIELDTYPE_NUMERIC
const CONTENTFIELDTYPE_NUMERIC
Definition: Recommender.php:19
MetadataSchema\MDFTYPE_TREE
const MDFTYPE_TREE
Definition: MetadataSchema.php:27
SPTRecommender
Definition: SPTRecommender.php:10
MetadataSchema\MDFTYPE_OPTION
const MDFTYPE_OPTION
Definition: MetadataSchema.php:29
MetadataSchema\MDFTYPE_FLAG
const MDFTYPE_FLAG
Definition: MetadataSchema.php:26
MetadataSchema\MDFTYPE_CONTROLLEDNAME
const MDFTYPE_CONTROLLEDNAME
Definition: MetadataSchema.php:28
PHP
PHP
Definition: RSSClient--Test.php:12
SPTRecommender\RunUpdateForItem
static RunUpdateForItem($SourceItemId, $StartingIndex)
Perform recommender db updates for a specified item (usually in the background)
Definition: SPTRecommender.php:163
SPTRecommender\QueueUpdateForItem
QueueUpdateForItem($ItemOrItemId, $TaskPriority=NULL)
Queue a background update for a specified item.
Definition: SPTRecommender.php:132
Recommender\CONTENTFIELDTYPE_TEXT
const CONTENTFIELDTYPE_TEXT
Definition: Recommender.php:18
MetadataSchema\MDFTYPE_PARAGRAPH
const MDFTYPE_PARAGRAPH
Definition: MetadataSchema.php:22
MetadataSchema\MDFTYPE_DATE
const MDFTYPE_DATE
Definition: MetadataSchema.php:24
Resource
Represents a "resource" in CWIS.
Definition: Resource.php:13
MetadataSchema\MDFTYPE_URL
const MDFTYPE_URL
Definition: MetadataSchema.php:33
SPTRecommender\SetUpdatePriority
static SetUpdatePriority($NewPriority)
Set the default priority for background tasks.
Definition: SPTRecommender.php:248
MetadataSchema\MDFTYPE_TEXT
const MDFTYPE_TEXT
Definition: MetadataSchema.php:21
MetadataSchema\MDFTYPE_USER
const MDFTYPE_USER
Definition: MetadataSchema.php:30
Recommender
Recommendation engine.
Definition: Recommender.php:13
ResourceFactory
Factory for Resource objects.
Definition: ResourceFactory.php:13