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java.lang.Object org.apache.nutch.scoring.opic.OPICScoringFilter
public class OPICScoringFilter
This plugin implements a variant of an Online Page Importance Computation (OPIC) score, described in this paper: Abiteboul, Serge and Preda, Mihai and Cobena, Gregory (2003), Adaptive On-Line Page Importance Computation .
Field Summary |
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Fields inherited from interface org.apache.nutch.scoring.ScoringFilter |
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X_POINT_ID |
Constructor Summary | |
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OPICScoringFilter()
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Method Summary | |
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CrawlDatum |
distributeScoreToOutlinks(Text fromUrl,
ParseData parseData,
Collection<Map.Entry<Text,CrawlDatum>> targets,
CrawlDatum adjust,
int allCount)
Get a float value from Fetcher.SCORE_KEY, divide it by the number of outlinks and apply. |
float |
generatorSortValue(Text url,
CrawlDatum datum,
float initSort)
Use CrawlDatum.getScore() . |
Configuration |
getConf()
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float |
indexerScore(Text url,
NutchDocument doc,
CrawlDatum dbDatum,
CrawlDatum fetchDatum,
Parse parse,
Inlinks inlinks,
float initScore)
Dampen the boost value by scorePower. |
void |
initialScore(Text url,
CrawlDatum datum)
Set to 0.0f (unknown value) - inlink contributions will bring it to a correct level. |
void |
injectedScore(Text url,
CrawlDatum datum)
Set an initial score for newly injected pages. |
void |
passScoreAfterParsing(Text url,
Content content,
Parse parse)
Copy the value from Content metadata under Fetcher.SCORE_KEY to parseData. |
void |
passScoreBeforeParsing(Text url,
CrawlDatum datum,
Content content)
Store a float value of CrawlDatum.getScore() under Fetcher.SCORE_KEY. |
void |
setConf(Configuration conf)
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void |
updateDbScore(Text url,
CrawlDatum old,
CrawlDatum datum,
List inlinked)
Increase the score by a sum of inlinked scores. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public OPICScoringFilter()
Method Detail |
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public Configuration getConf()
getConf
in interface Configurable
public void setConf(Configuration conf)
setConf
in interface Configurable
public void injectedScore(Text url, CrawlDatum datum) throws ScoringFilterException
ScoringFilter
injectedScore
in interface ScoringFilter
url
- url of the pagedatum
- new datum. Filters will modify it in-place.
ScoringFilterException
public void initialScore(Text url, CrawlDatum datum) throws ScoringFilterException
initialScore
in interface ScoringFilter
url
- url of the pagedatum
- new datum. Filters will modify it in-place.
ScoringFilterException
public float generatorSortValue(Text url, CrawlDatum datum, float initSort) throws ScoringFilterException
CrawlDatum.getScore()
.
generatorSortValue
in interface ScoringFilter
url
- url of the pagedatum
- page's datum, should not be modifiedinitSort
- initial sort value, or a value from previous filters in chain
ScoringFilterException
public void updateDbScore(Text url, CrawlDatum old, CrawlDatum datum, List inlinked) throws ScoringFilterException
updateDbScore
in interface ScoringFilter
url
- url of the pageold
- original datum, with original score. May be null if this is a newly
discovered page. If not null, filters should use score values from this parameter
as the starting values - the datum
parameter may contain values that are
no longer valid, if other updates occured between generation and this update.datum
- the new datum, with the original score saved at the time when
fetchlist was generated. Filters should update this in-place, and it will be saved in
the crawldb.inlinked
- (partial) list of CrawlDatum-s (with their scores) from
links pointing to this page, found in the current update batch.
ScoringFilterException
public void passScoreBeforeParsing(Text url, CrawlDatum datum, Content content)
passScoreBeforeParsing
in interface ScoringFilter
url
- url of the pagedatum
- source datum. NOTE: modifications to this value are not persisted.content
- instance of content. Implementations may modify this
in-place, primarily by setting some metadata properties.public void passScoreAfterParsing(Text url, Content content, Parse parse)
passScoreAfterParsing
in interface ScoringFilter
url
- page urlcontent
- original content. NOTE: modifications to this value are not persisted.parse
- target instance to copy the score information to. Implementations
may modify this in-place, primarily by setting some metadata properties.public CrawlDatum distributeScoreToOutlinks(Text fromUrl, ParseData parseData, Collection<Map.Entry<Text,CrawlDatum>> targets, CrawlDatum adjust, int allCount) throws ScoringFilterException
distributeScoreToOutlinks
in interface ScoringFilter
fromUrl
- url of the source pageparseData
- ParseData instance, which stores relevant score value(s)
in its metadata. NOTE: filters may modify this in-place, all changes will
be persisted.targets
- <url, CrawlDatum> pairs. NOTE: filters can modify this in-place,
all changes will be persisted.adjust
- a CrawlDatum instance, initially null, which implementations
may use to pass adjustment values to the original CrawlDatum. When creating
this instance, set its status to CrawlDatum.STATUS_LINKED
.allCount
- number of all collected outlinks from the source page
CrawlDatum.STATUS_LINKED
, which contains adjustments
to be applied to the original CrawlDatum score(s) and metadata. This can
be null if not needed.
ScoringFilterException
public float indexerScore(Text url, NutchDocument doc, CrawlDatum dbDatum, CrawlDatum fetchDatum, Parse parse, Inlinks inlinks, float initScore) throws ScoringFilterException
indexerScore
in interface ScoringFilter
url
- url of the pagedoc
- Lucene document. NOTE: this already contains all information collected
by indexing filters. Implementations may modify this instance, in order to store/remove
some information.dbDatum
- current page from CrawlDb. NOTE: changes made to this instance
are not persisted.fetchDatum
- datum from FetcherOutput (containing among others the fetching status)parse
- parsing result. NOTE: changes made to this instance are not persisted.inlinks
- current inlinks from LinkDb. NOTE: changes made to this instance are
not persisted.initScore
- initial boost value for the Lucene document.
ScoringFilterException
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