/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.nutch.scoring;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map.Entry;
import org.apache.nutch.crawl.CrawlDatum;
import org.apache.nutch.crawl.Inlinks;
import org.apache.nutch.indexer.NutchDocument;
import org.apache.nutch.parse.Parse;
import org.apache.nutch.parse.ParseData;
import org.apache.nutch.plugin.Extension;
import org.apache.nutch.plugin.ExtensionPoint;
import org.apache.nutch.plugin.PluginRuntimeException;
import org.apache.nutch.plugin.PluginRepository;
import org.apache.nutch.protocol.Content;
import org.apache.nutch.util.ObjectCache;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.io.Text;
/**
* Creates and caches {@link ScoringFilter} implementing plugins.
*
* @author Andrzej Bialecki
*/
public class ScoringFilters extends Configured implements ScoringFilter {
private ScoringFilter[] filters;
public ScoringFilters(Configuration conf) {
super(conf);
ObjectCache objectCache = ObjectCache.get(conf);
String order = conf.get("scoring.filter.order");
this.filters = (ScoringFilter[]) objectCache.getObject(ScoringFilter.class.getName());
if (this.filters == null) {
String[] orderedFilters = null;
if (order != null && !order.trim().equals("")) {
orderedFilters = order.split("\\s+");
}
try {
ExtensionPoint point = PluginRepository.get(conf).getExtensionPoint(ScoringFilter.X_POINT_ID);
if (point == null) throw new RuntimeException(ScoringFilter.X_POINT_ID + " not found.");
Extension[] extensions = point.getExtensions();
HashMap<String, ScoringFilter> filterMap =
new HashMap<String, ScoringFilter>();
for (int i = 0; i < extensions.length; i++) {
Extension extension = extensions[i];
ScoringFilter filter = (ScoringFilter) extension.getExtensionInstance();
if (!filterMap.containsKey(filter.getClass().getName())) {
filterMap.put(filter.getClass().getName(), filter);
}
}
if (orderedFilters == null) {
objectCache.setObject(ScoringFilter.class.getName(), filterMap.values().toArray(new ScoringFilter[0]));
} else {
ScoringFilter[] filter = new ScoringFilter[orderedFilters.length];
for (int i = 0; i < orderedFilters.length; i++) {
filter[i] = filterMap.get(orderedFilters[i]);
}
objectCache.setObject(ScoringFilter.class.getName(), filter);
}
} catch (PluginRuntimeException e) {
throw new RuntimeException(e);
}
this.filters = (ScoringFilter[]) objectCache.getObject(ScoringFilter.class.getName());
}
}
/** Calculate a sort value for Generate. */
public float generatorSortValue(Text url, CrawlDatum datum, float initSort) throws ScoringFilterException {
for (int i = 0; i < this.filters.length; i++) {
initSort = this.filters[i].generatorSortValue(url, datum, initSort);
}
return initSort;
}
/** Calculate a new initial score, used when adding newly discovered pages. */
public void initialScore(Text url, CrawlDatum datum) throws ScoringFilterException {
for (int i = 0; i < this.filters.length; i++) {
this.filters[i].initialScore(url, datum);
}
}
/** Calculate a new initial score, used when injecting new pages. */
public void injectedScore(Text url, CrawlDatum datum) throws ScoringFilterException {
for (int i = 0; i < this.filters.length; i++) {
this.filters[i].injectedScore(url, datum);
}
}
/** Calculate updated page score during CrawlDb.update(). */
public void updateDbScore(Text url, CrawlDatum old, CrawlDatum datum, List<CrawlDatum> inlinked) throws ScoringFilterException {
for (int i = 0; i < this.filters.length; i++) {
this.filters[i].updateDbScore(url, old, datum, inlinked);
}
}
public void passScoreBeforeParsing(Text url, CrawlDatum datum, Content content) throws ScoringFilterException {
for (int i = 0; i < this.filters.length; i++) {
this.filters[i].passScoreBeforeParsing(url, datum, content);
}
}
public void passScoreAfterParsing(Text url, Content content, Parse parse) throws ScoringFilterException {
for (int i = 0; i < this.filters.length; i++) {
this.filters[i].passScoreAfterParsing(url, content, parse);
}
}
public CrawlDatum distributeScoreToOutlinks(Text fromUrl, ParseData parseData, Collection<Entry<Text, CrawlDatum>> targets, CrawlDatum adjust, int allCount) throws ScoringFilterException {
for (int i = 0; i < this.filters.length; i++) {
adjust = this.filters[i].distributeScoreToOutlinks(fromUrl, parseData, targets, adjust, allCount);
}
return adjust;
}
public float indexerScore(Text url, NutchDocument doc, CrawlDatum dbDatum, CrawlDatum fetchDatum, Parse parse, Inlinks inlinks, float initScore) throws ScoringFilterException {
for (int i = 0; i < this.filters.length; i++) {
initScore = this.filters[i].indexerScore(url, doc, dbDatum, fetchDatum, parse, inlinks, initScore);
}
return initScore;
}
}