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// plasmaSearchRankingProcess.java
// (C) 2007 by Michael Peter Christen; mc@yacy.net, Frankfurt a. M., Germany
// first published 07.11.2007 on http://yacy.net
//
// This is a part of YaCy, a peer-to-peer based web search engine
//
// $LastChangedDate: 2006-04-02 22:40:07 +0200 (So, 02 Apr 2006) $
// $LastChangedRevision: 1986 $
// $LastChangedBy: orbiter $
//
// LICENSE
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
package de.anomic.plasma;
import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import java.util.TreeMap;
import java.util.TreeSet;
import de.anomic.htmlFilter.htmlFilterContentScraper;
import de.anomic.index.indexContainer;
import de.anomic.index.indexRWIEntry;
import de.anomic.index.indexRWIEntryOrder;
import de.anomic.index.indexRWIRowEntry;
import de.anomic.index.indexURLEntry;
import de.anomic.kelondro.kelondroBinSearch;
import de.anomic.kelondro.kelondroMScoreCluster;
import de.anomic.server.serverCodings;
import de.anomic.server.serverFileUtils;
import de.anomic.server.serverProfiling;
public final class plasmaSearchRankingProcess {
public static kelondroBinSearch[] ybrTables = null; // block-rank tables
private static boolean useYBR = true;
private TreeMap<Object, indexRWIRowEntry> sortedRWIEntries; // key = ranking (Long); value = indexRWIEntry; if sortorder < 2 then key is instance of String
private HashMap<String, TreeMap<Object, indexRWIRowEntry>> doubleDomCache; // key = domhash (6 bytes); value = TreeMap like sortedRWIEntries
private HashMap<String, String> handover; // key = urlhash, value = urlstring; used for double-check of urls that had been handed over to search process
private plasmaSearchQuery query;
private int sortorder;
private int maxentries;
private int remote_peerCount, remote_indexCount, remote_resourceSize, local_resourceSize;
private indexRWIEntryOrder order;
private HashMap<String, Object> urlhashes; // map for double-check; String/Long relation, addresses ranking number (backreference for deletion)
private kelondroMScoreCluster<String> ref; // reference score computation for the commonSense heuristic
private int[] flagcount; // flag counter
private TreeSet<String> misses; // contains url-hashes that could not been found in the LURL-DB
private plasmaWordIndex wordIndex;
private Map<String, indexContainer>[] localSearchContainerMaps;
public plasmaSearchRankingProcess(plasmaWordIndex wordIndex, plasmaSearchQuery query, int sortorder, int maxentries) {
// we collect the urlhashes and construct a list with urlEntry objects
// attention: if minEntries is too high, this method will not terminate within the maxTime
// sortorder: 0 = hash, 1 = url, 2 = ranking
this.localSearchContainerMaps = null;
this.sortedRWIEntries = new TreeMap<Object, indexRWIRowEntry>();
this.doubleDomCache = new HashMap<String, TreeMap<Object, indexRWIRowEntry>>();
this.handover = new HashMap<String, String>();
this.order = null;
this.query = query;
this.maxentries = maxentries;
this.remote_peerCount = 0;
this.remote_indexCount = 0;
this.remote_resourceSize = 0;
this.local_resourceSize = 0;
this.urlhashes = new HashMap<String, Object>();
this.ref = new kelondroMScoreCluster<String>();
this.misses = new TreeSet<String>();
this.wordIndex = wordIndex;
this.sortorder = sortorder;
this.flagcount = new int[32];
for (int i = 0; i < 32; i++) {this.flagcount[i] = 0;}
}
public void execQuery() {
long timer = System.currentTimeMillis();
this.localSearchContainerMaps = wordIndex.localSearchContainers(query, null);
serverProfiling.update("SEARCH", new plasmaProfiling.searchEvent(query.id(true), plasmaSearchEvent.COLLECTION, this.localSearchContainerMaps[0].size(), System.currentTimeMillis() - timer));
// join and exclude the local result
timer = System.currentTimeMillis();
indexContainer index =
(this.localSearchContainerMaps == null) ?
plasmaWordIndex.emptyContainer(null, 0) :
indexContainer.joinExcludeContainers(
this.localSearchContainerMaps[0].values(),
this.localSearchContainerMaps[1].values(),
query.maxDistance);
serverProfiling.update("SEARCH", new plasmaProfiling.searchEvent(query.id(true), plasmaSearchEvent.JOIN, index.size(), System.currentTimeMillis() - timer));
int joincount = index.size();
if ((index == null) || (joincount == 0)) {
return;
}
if (sortorder == 2) {
insertRanked(index, true, index.size());
} else {
insertNoOrder(index, true, index.size());
}
}
private void insertNoOrder(indexContainer index, boolean local, int fullResource) {
final Iterator<indexRWIRowEntry> en = index.entries();
// generate a new map where the urls are sorted (not by hash but by the url text)
if (local) {
this.local_resourceSize += fullResource;
} else {
this.remote_resourceSize += fullResource;
this.remote_peerCount++;
this.remote_indexCount += index.size();
}
indexRWIRowEntry ientry;
indexURLEntry uentry;
String u;
loop: while (en.hasNext()) {
ientry = en.next();
// check constraints
if (!testFlags(ientry)) continue loop;
// increase flag counts
for (int i = 0; i < 32; i++) {
if (ientry.flags().get(i)) {flagcount[i]++;}
}
// load url
if (sortorder == 0) {
this.sortedRWIEntries.put(ientry.urlHash(), ientry);
this.urlhashes.put(ientry.urlHash(), ientry.urlHash());
} else {
uentry = wordIndex.loadedURL.load(ientry.urlHash(), ientry, 0);
if (uentry == null) {
this.misses.add(ientry.urlHash());
} else {
u = uentry.comp().url().toNormalform(false, true);
this.sortedRWIEntries.put(u, ientry);
this.urlhashes.put(ientry.urlHash(), u);
}
}
// interrupt if we have enough
if ((query.neededResults() > 0) && (this.misses.size() + this.sortedRWIEntries.size() > query.neededResults())) break loop;
} // end loop
}
public void insertRanked(indexContainer index, boolean local, int fullResource) {
// we collect the urlhashes and construct a list with urlEntry objects
// attention: if minEntries is too high, this method will not terminate within the maxTime
assert (index != null);
if (index.size() == 0) return;
if (local) {
this.local_resourceSize += fullResource;
} else {
this.remote_resourceSize += fullResource;
this.remote_peerCount++;
}
long timer = System.currentTimeMillis();
if (this.order == null) {
this.order = new indexRWIEntryOrder(query.ranking);
}
this.order.normalizeWith(index);
serverProfiling.update("SEARCH", new plasmaProfiling.searchEvent(query.id(true), plasmaSearchEvent.NORMALIZING, index.size(), System.currentTimeMillis() - timer));
// normalize entries and get ranking
timer = System.currentTimeMillis();
Iterator<indexRWIRowEntry> i = index.entries();
indexRWIRowEntry iEntry, l;
long biggestEntry = 0;
//long s0 = System.currentTimeMillis();
Long r;
while (i.hasNext()) {
iEntry = i.next();
if (iEntry.urlHash().length() != index.row().primaryKeyLength) continue;
// increase flag counts
for (int j = 0; j < 32; j++) {
if (iEntry.flags().get(j)) {flagcount[j]++;}
}
// kick out entries that are too bad according to current findings
r = new Long(order.cardinal(iEntry));
if ((maxentries >= 0) && (sortedRWIEntries.size() >= maxentries) && (r.longValue() > biggestEntry)) continue;
// check constraints
if (!testFlags(iEntry)) continue;
if (query.contentdom != plasmaSearchQuery.CONTENTDOM_TEXT) {
if ((query.contentdom == plasmaSearchQuery.CONTENTDOM_AUDIO) && (!(iEntry.flags().get(plasmaCondenser.flag_cat_hasaudio)))) continue;
if ((query.contentdom == plasmaSearchQuery.CONTENTDOM_VIDEO) && (!(iEntry.flags().get(plasmaCondenser.flag_cat_hasvideo)))) continue;
if ((query.contentdom == plasmaSearchQuery.CONTENTDOM_IMAGE) && (!(iEntry.flags().get(plasmaCondenser.flag_cat_hasimage)))) continue;
if ((query.contentdom == plasmaSearchQuery.CONTENTDOM_APP ) && (!(iEntry.flags().get(plasmaCondenser.flag_cat_hasapp )))) continue;
}
if ((maxentries < 0) || (sortedRWIEntries.size() < maxentries)) {
if (urlhashes.containsKey(iEntry.urlHash())) continue;
while (sortedRWIEntries.containsKey(r)) r = new Long(r.longValue() + 1);
sortedRWIEntries.put(r, iEntry);
} else {
if (r.longValue() > biggestEntry) {
continue;
} else {
if (urlhashes.containsKey(iEntry.urlHash())) continue;
l = sortedRWIEntries.remove((Long) sortedRWIEntries.lastKey());
urlhashes.remove(l.urlHash());
while (sortedRWIEntries.containsKey(r)) r = new Long(r.longValue() + 1);
sortedRWIEntries.put(r, iEntry);
biggestEntry = order.cardinal(sortedRWIEntries.get(sortedRWIEntries.lastKey()));
}
}
// increase counter for statistics
if (!local) this.remote_indexCount++;
}
//if ((query.neededResults() > 0) && (container.size() > query.neededResults())) remove(true, true);
serverProfiling.update("SEARCH", new plasmaProfiling.searchEvent(query.id(true), plasmaSearchEvent.PRESORT, index.size(), System.currentTimeMillis() - timer));
}
private boolean testFlags(indexRWIEntry ientry) {
if (query.constraint == null) return true;
// test if ientry matches with filter
// if all = true: let only entries pass that has all matching bits
// if all = false: let all entries pass that has at least one matching bit
if (query.allofconstraint) {
for (int i = 0; i < 32; i++) {
if ((query.constraint.get(i)) && (!ientry.flags().get(i))) return false;
}
return true;
}
for (int i = 0; i < 32; i++) {
if ((query.constraint.get(i)) && (ientry.flags().get(i))) return true;
}
return false;
}
public synchronized Map<String, indexContainer>[] searchContainerMaps() {
// direct access to the result maps is needed for abstract generation
// this is only available if execQuery() was called before
return localSearchContainerMaps;
}
// todo:
// - remove redundant urls (sub-path occurred before)
// - move up shorter urls
// - root-domain guessing to prefer the root domain over other urls if search word appears in domain name
private synchronized Object[] /*{Object, indexRWIEntry}*/ bestRWI(boolean skipDoubleDom) {
// returns from the current RWI list the best entry and removed this entry from the list
Object bestEntry;
TreeMap<Object, indexRWIRowEntry> m;
indexRWIRowEntry rwi;
while (sortedRWIEntries.size() > 0) {
bestEntry = sortedRWIEntries.firstKey();
rwi = sortedRWIEntries.remove(bestEntry);
if (!skipDoubleDom) return new Object[]{bestEntry, rwi};
// check doubledom
String domhash = rwi.urlHash().substring(6);
m = this.doubleDomCache.get(domhash);
if (m == null) {
// first appearance of dom
m = new TreeMap<Object, indexRWIRowEntry>();
this.doubleDomCache.put(domhash, m);
return new Object[]{bestEntry, rwi};
}
// second appearances of dom
m.put(bestEntry, rwi);
}
// no more entries in sorted RWI entries. Now take Elements from the doubleDomCache
// find best entry from all caches
Iterator<TreeMap<Object, indexRWIRowEntry>> i = this.doubleDomCache.values().iterator();
bestEntry = null;
Object o;
indexRWIRowEntry bestrwi = null;
while (i.hasNext()) {
m = i.next();
if (m.size() == 0) continue;
if (bestEntry == null) {
bestEntry = m.firstKey();
bestrwi = m.remove(bestEntry);
continue;
}
o = m.firstKey();
rwi = m.remove(o);
if (o instanceof Long) {
if (((Long) o).longValue() < ((Long) bestEntry).longValue()) {
bestEntry = o;
bestrwi = rwi;
}
}
if (o instanceof String) {
if (((String) o).compareTo((String) bestEntry) < 0) {
bestEntry = o;
bestrwi = rwi;
}
}
}
if (bestrwi == null) return null;
// finally remove the best entry from the doubledom cache
m = this.doubleDomCache.get(bestrwi.urlHash().substring(6));
m.remove(bestEntry);
return new Object[]{bestEntry, bestrwi};
}
public synchronized indexURLEntry bestURL(boolean skipDoubleDom) {
// returns from the current RWI list the best URL entry and removed this entry from the list
while ((sortedRWIEntries.size() > 0) || (size() > 0)) {
Object[] obrwi = bestRWI(skipDoubleDom);
Object bestEntry = obrwi[0];
indexRWIRowEntry ientry = (indexRWIRowEntry) obrwi[1];
long ranking = (bestEntry instanceof Long) ? ((Long) bestEntry).longValue() : 0;
indexURLEntry u = wordIndex.loadedURL.load(ientry.urlHash(), ientry, ranking);
if (u != null) {
indexURLEntry.Components comp = u.comp();
if (comp.url() != null) this.handover.put(u.hash(), comp.url().toNormalform(true, false)); // remember that we handed over this url
return u;
}
misses.add(ientry.urlHash());
}
return null;
}
public synchronized int size() {
//assert sortedRWIEntries.size() == urlhashes.size() : "sortedRWIEntries.size() = " + sortedRWIEntries.size() + ", urlhashes.size() = " + urlhashes.size();
int c = sortedRWIEntries.size();
Iterator<TreeMap<Object, indexRWIRowEntry>> i = this.doubleDomCache.values().iterator();
while (i.hasNext()) c += i.next().size();
return c;
}
public int[] flagCount() {
return flagcount;
}
// "results from a total number of <remote_resourceSize + local_resourceSize> known (<local_resourceSize> local, <remote_resourceSize> remote), <remote_indexCount> links from <remote_peerCount> other YaCy peers."
public int filteredCount() {
// the number of index entries that are considered as result set
return this.sortedRWIEntries.size();
}
public int getRemoteIndexCount() {
// the number of result contributions from all the remote peers
return this.remote_indexCount;
}
public int getRemotePeerCount() {
// the number of remote peers that have contributed
return this.remote_peerCount;
}
public int getRemoteResourceSize() {
// the number of all hits in all the remote peers
return this.remote_resourceSize;
}
public int getLocalResourceSize() {
// the number of hits in the local peer (index size, size of the collection in the own index)
return this.local_resourceSize;
}
public indexRWIEntry remove(String urlHash) {
Object r = (Long) urlhashes.get(urlHash);
if (r == null) return null;
assert sortedRWIEntries.containsKey(r);
indexRWIEntry iEntry = (indexRWIEntry) sortedRWIEntries.remove(r);
urlhashes.remove(urlHash);
return iEntry;
}
public Iterator<String> miss() {
return this.misses.iterator();
}
public Set<String> getReferences(int count) {
// create a list of words that had been computed by statistics over all
// words that appeared in the url or the description of all urls
Object[] refs = ref.getScores(count, false, 2, Integer.MAX_VALUE);
TreeSet<String> s = new TreeSet<String>(String.CASE_INSENSITIVE_ORDER);
for (int i = 0; i < refs.length; i++) {
s.add((String) refs[i]);
}
return s;
}
public void addReferences(String[] words) {
String word;
for (int i = 0; i < words.length; i++) {
word = words[i].toLowerCase();
if ((word.length() > 2) &&
("http_html_php_ftp_www_com_org_net_gov_edu_index_home_page_for_usage_the_and_".indexOf(word) < 0) &&
(!(query.queryHashes.contains(plasmaCondenser.word2hash(word)))))
ref.incScore(word);
}
}
protected void addReferences(plasmaSearchEvent.ResultEntry resultEntry) {
// take out relevant information for reference computation
if ((resultEntry.url() == null) || (resultEntry.title() == null)) return;
String[] urlcomps = htmlFilterContentScraper.urlComps(resultEntry.url().toNormalform(true, true)); // word components of the url
String[] descrcomps = resultEntry.title().toLowerCase().split(htmlFilterContentScraper.splitrex); // words in the description
// add references
addReferences(urlcomps);
addReferences(descrcomps);
}
public indexRWIEntryOrder getOrder() {
return this.order;
}
public static void loadYBR(File rankingPath, int count) {
// load ranking tables
if (rankingPath.exists()) {
ybrTables = new kelondroBinSearch[count];
String ybrName;
File f;
try {
for (int i = 0; i < count; i++) {
ybrName = "YBR-4-" + serverCodings.encodeHex(i, 2) + ".idx";
f = new File(rankingPath, ybrName);
if (f.exists()) {
ybrTables[i] = new kelondroBinSearch(serverFileUtils.read(f), 6);
} else {
ybrTables[i] = null;
}
}
} catch (IOException e) {
ybrTables = null;
}
} else {
ybrTables = null;
}
}
public static boolean canUseYBR() {
return ybrTables != null;
}
public static boolean isUsingYBR() {
return useYBR;
}
public static void switchYBR(boolean usage) {
useYBR = usage;
}
public static int ybr(String urlHash) {
// returns the YBR value in a range of 0..15, where 0 means best ranking and 15 means worst ranking
if (ybrTables == null) return 15;
if (!(useYBR)) return 15;
final String domHash = urlHash.substring(6);
for (int i = 0; i < ybrTables.length; i++) {
if ((ybrTables[i] != null) && (ybrTables[i].contains(domHash.getBytes()))) {
//System.out.println("YBR FOUND: " + urlHash + " (" + i + ")");
return i;
}
}
//System.out.println("NOT FOUND: " + urlHash);
return 15;
}
public long postRanking(
Set<String> topwords,
plasmaSearchEvent.ResultEntry rentry,
int position) {
long r = (255 - position) << 8;
// for media search: prefer pages with many links
if (query.contentdom == plasmaSearchQuery.CONTENTDOM_IMAGE) r += rentry.limage() << query.ranking.coeff_cathasimage;
if (query.contentdom == plasmaSearchQuery.CONTENTDOM_AUDIO) r += rentry.laudio() << query.ranking.coeff_cathasaudio;
if (query.contentdom == plasmaSearchQuery.CONTENTDOM_VIDEO) r += rentry.lvideo() << query.ranking.coeff_cathasvideo;
if (query.contentdom == plasmaSearchQuery.CONTENTDOM_APP ) r += rentry.lapp() << query.ranking.coeff_cathasapp;
// prefer hit with 'prefer' pattern
if (rentry.url().toNormalform(true, true).matches(query.prefer)) r += 256 << query.ranking.coeff_prefer;
if (rentry.title().matches(query.prefer)) r += 256 << query.ranking.coeff_prefer;
// apply 'common-sense' heuristic using references
String urlstring = rentry.url().toNormalform(true, true);
String[] urlcomps = htmlFilterContentScraper.urlComps(urlstring);
String[] descrcomps = rentry.title().toLowerCase().split(htmlFilterContentScraper.splitrex);
for (int j = 0; j < urlcomps.length; j++) {
if (topwords.contains(urlcomps[j])) r += Math.max(1, 256 - urlstring.length()) << query.ranking.coeff_urlcompintoplist;
}
for (int j = 0; j < descrcomps.length; j++) {
if (topwords.contains(descrcomps[j])) r += Math.max(1, 256 - rentry.title().length()) << query.ranking.coeff_descrcompintoplist;
}
// apply query-in-result matching
Set<String> urlcomph = plasmaCondenser.words2hashSet(urlcomps);
Set<String> descrcomph = plasmaCondenser.words2hashSet(descrcomps);
Iterator<String> shi = query.queryHashes.iterator();
String queryhash;
while (shi.hasNext()) {
queryhash = shi.next();
if (urlcomph.contains(queryhash)) r += 256 << query.ranking.coeff_appurl;
if (descrcomph.contains(queryhash)) r += 256 << query.ranking.coeff_appdescr;
}
return r;
}
}
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