// Fulltext.java
// (C) 2006 by Michael Peter Christen; mc@yacy.net, Frankfurt a. M., Germany
// first published 2006 as part of 'plasmaCrawlLURL.java' on http://yacy.net
//
// This is a part of YaCy, a peer-to-peer based web search engine
//
// 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 net.yacy.search.index;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.TreeSet;
import net.yacy.cora.date.GenericFormatter;
import net.yacy.cora.document.ASCII;
import net.yacy.cora.document.MultiProtocolURI;
import net.yacy.cora.federate.solr.YaCySchema;
import net.yacy.cora.federate.solr.connector.EmbeddedSolrConnector;
import net.yacy.cora.federate.solr.connector.MirrorSolrConnector;
import net.yacy.cora.federate.solr.connector.SolrConnector;
import net.yacy.cora.order.CloneableIterator;
import net.yacy.cora.sorting.ConcurrentScoreMap;
import net.yacy.cora.sorting.ScoreMap;
import net.yacy.cora.storage.HandleSet;
import net.yacy.cora.storage.ZIPReader;
import net.yacy.cora.storage.ZIPWriter;
import net.yacy.cora.util.SpaceExceededException;
import net.yacy.document.parser.html.CharacterCoding;
import net.yacy.kelondro.data.meta.DigestURI;
import net.yacy.kelondro.data.meta.URIMetadata;
import net.yacy.kelondro.data.meta.URIMetadataNode;
import net.yacy.kelondro.data.meta.URIMetadataRow;
import net.yacy.kelondro.data.word.WordReference;
import net.yacy.kelondro.index.Cache;
import net.yacy.kelondro.index.Index;
import net.yacy.kelondro.index.Row;
import net.yacy.kelondro.logging.Log;
import net.yacy.kelondro.table.SplitTable;
import net.yacy.kelondro.util.MemoryControl;
import net.yacy.kelondro.util.MergeIterator;
import net.yacy.search.Switchboard;
import org.apache.lucene.util.Version;
import org.apache.solr.client.solrj.util.ClientUtils;
import org.apache.solr.common.SolrDocument;
import org.apache.solr.common.SolrException;
import org.apache.solr.common.SolrInputDocument;
public final class Fulltext implements Iterable<byte[]> {
// class objects
private final File location;
private Index urlIndexFile;
private Export exportthread; // will have a export thread assigned if exporter is running
private String tablename;
private ArrayList<HostStat> statsDump;
private final MirrorSolrConnector solr;
private final SolrConfiguration solrScheme;
public Fulltext(final File path, final SolrConfiguration solrScheme) {
this.location = path;
this.tablename = null;
this.urlIndexFile = null;
this.exportthread = null; // will have a export thread assigned if exporter is running
this.statsDump = null;
this.solr = new MirrorSolrConnector(10000, 10000, 1000);
this.solrScheme = solrScheme;
}
public boolean connectedUrlDb() {
return this.urlIndexFile != null;
}
public void connectUrlDb(final String tablename, final boolean useTailCache, final boolean exceed134217727) {
if (this.urlIndexFile != null) return;
this.tablename = tablename;
this.urlIndexFile = new SplitTable(this.location, tablename, URIMetadataRow.rowdef, useTailCache, exceed134217727);
}
public void disconnectUrlDb() {
if (this.urlIndexFile == null) return;
this.urlIndexFile.close();
this.urlIndexFile = null;
}
public SolrConfiguration getSolrScheme() {
return this.solrScheme;
}
public boolean connectedSolr() {
return this.solr.isConnected0() || this.solr.isConnected1();
}
public boolean connectedLocalSolr() {
return this.solr.isConnected0();
}
public void connectLocalSolr(final int commitWithin) throws IOException {
File solrLocation = this.location;
if (solrLocation.getName().equals("default")) solrLocation = solrLocation.getParentFile();
String solrPath = "solr_36";
solrLocation = new File(solrLocation, solrPath); // the number should be identical to the number in the property luceneMatchVersion in solrconfig.xml
EmbeddedSolrConnector esc = new EmbeddedSolrConnector(solrLocation, new File(new File(Switchboard.getSwitchboard().appPath, "defaults"), "solr"));
esc.setCommitWithinMs(commitWithin);
Version luceneVersion = esc.getConfig().getLuceneVersion("luceneMatchVersion");
String lvn = luceneVersion.name();
int p = lvn.indexOf('_');
assert solrPath.endsWith(lvn.substring(p)) : "luceneVersion = " + lvn + ", solrPath = " + solrPath + ", p = " + p;
Log.logInfo("MetadataRepository", "connected solr in " + solrLocation.toString() + ", lucene version " + lvn);
this.solr.connect0(esc);
}
public void disconnectLocalSolr() {
this.solr.disconnect0();
}
public boolean connectedRemoteSolr() {
return this.solr.isConnected1();
}
public void connectRemoteSolr(final SolrConnector rs) {
this.solr.connect1(rs);
}
public void disconnectRemoteSolr() {
this.solr.disconnect1();
}
public SolrConnector getLocalSolr() {
return this.solr.getSolr0();
}
public SolrConnector getRemoteSolr() {
return this.solr.getSolr1();
}
public SolrConnector getSolr() {
return this.solr;
}
public void clearCache() {
if (this.urlIndexFile != null && this.urlIndexFile instanceof Cache) ((Cache) this.urlIndexFile).clearCache();
if (this.statsDump != null) this.statsDump.clear();
this.statsDump = null;
this.solr.clearCache();
}
public void clear() throws IOException {
if (this.exportthread != null) this.exportthread.interrupt();
if (this.urlIndexFile == null) {
SplitTable.delete(this.location, this.tablename);
} else {
this.urlIndexFile.clear();
}
this.solr.clear();
// the remote solr is not cleared here because that shall be done separately
this.statsDump = null;
}
public int size() {
int size = 0;
size += this.urlIndexFile == null ? 0 : this.urlIndexFile.size();
size += this.solr.getSize();
return size;
}
public void close() {
this.statsDump = null;
if (this.urlIndexFile != null) {
this.urlIndexFile.close();
this.urlIndexFile = null;
}
this.solr.close();
}
/**
* generates an plasmaLURLEntry using the url hash
* if the url cannot be found, this returns null
* @param obrwi
* @return
*/
public URIMetadata getMetadata(WordReference wre, long weight) {
if (wre == null) return null; // all time was already wasted in takeRWI to get another element
return getMetadata(wre.urlhash(), wre, weight);
}
public URIMetadata getMetadata(final byte[] urlHash) {
if (urlHash == null) return null;
return getMetadata(urlHash, null, 0);
}
private URIMetadata getMetadata(final byte[] urlHash, WordReference wre, long weight) {
// get the metadata from Solr
try {
SolrDocument doc = this.solr.get(ASCII.String(urlHash));
if (doc != null) {
if (this.urlIndexFile != null) this.urlIndexFile.remove(urlHash);
return new URIMetadataNode(doc, wre, weight);
}
} catch (IOException e) {
Log.logException(e);
}
// get the metadata from the old metadata index
if (this.urlIndexFile != null) try {
if (this.connectedSolr()) {
// slow migration to solr
final Row.Entry entry = this.urlIndexFile.remove(urlHash);
if (entry == null) return null;
URIMetadataRow row = new URIMetadataRow(entry, wre, weight);
this.putDocument(this.solrScheme.metadata2solr(row));
return row;
}
final Row.Entry entry = this.urlIndexFile.get(urlHash, false);
if (entry != null) return new URIMetadataRow(entry, wre, weight);
} catch (final IOException e) {
Log.logException(e);
}
return null;
}
public SolrDocument getDocument(WordReference wre, long weight) {
if (wre == null) return null; // all time was already wasted in takeRWI to get another element
return getDocument(wre.urlhash(), wre, weight);
}
public SolrDocument getDocument(final byte[] urlHash) {
if (urlHash == null) return null;
return getDocument(urlHash, null, 0);
}
private SolrDocument getDocument(final byte[] urlHash, WordReference wre, long weight) {
// get the document from Solr
try {
SolrDocument doc = this.solr.get(ASCII.String(urlHash));
if (doc != null) {
if (this.urlIndexFile != null) this.urlIndexFile.remove(urlHash);
return doc;
}
} catch (IOException e) {
Log.logException(e);
}
// get the document from the old metadata index
if (this.urlIndexFile != null) try {
if (this.connectedSolr()) {
// slow migration to solr
final Row.Entry entry = this.urlIndexFile.remove(urlHash);
if (entry == null) return null;
URIMetadataRow row = new URIMetadataRow(entry, wre, weight);
this.putDocument(this.solrScheme.metadata2solr(row));
return ClientUtils.toSolrDocument(getSolrScheme().metadata2solr(row));
}
final Row.Entry entry = this.urlIndexFile.get(urlHash, false);
if (entry == null) return null;
return ClientUtils.toSolrDocument(getSolrScheme().metadata2solr(new URIMetadataRow(entry, wre, weight)));
} catch (final IOException e) {
Log.logException(e);
}
return null;
}
public void putDocument(final SolrInputDocument doc) throws IOException {
String id = (String) doc.getFieldValue(YaCySchema.id.name());
byte[] idb = ASCII.getBytes(id);
if (this.connectedSolr()) {
try {
if (this.urlIndexFile != null) this.urlIndexFile.remove(idb);
SolrDocument sd = this.solr.get(id);
if (sd == null || this.solrScheme.getDate(sd, YaCySchema.last_modified).before(this.solrScheme.getDate(doc, YaCySchema.last_modified))) {
if (this.solrScheme.contains(YaCySchema.ip_s)) {
// ip_s needs a dns lookup which causes blockings during search here
this.solr.add(doc);
} else synchronized (this.solr) {
this.solr.add(doc);
}
}
} catch (SolrException e) {
throw new IOException(e.getMessage(), e);
}
} else if (this.urlIndexFile != null) {
URIMetadata oldEntry = null;
try {
final Row.Entry oe = this.urlIndexFile.get(idb, false);
oldEntry = (oe == null) ? null : new URIMetadataRow(oe, null, 0);
} catch (final Throwable e) {
Log.logException(e);
oldEntry = null;
}
URIMetadataNode entry = new URIMetadataNode(ClientUtils.toSolrDocument(doc));
if (oldEntry == null || oldEntry.isOlder(entry)) {
try {
this.urlIndexFile.put(entry.toRow().toRowEntry());
} catch (final SpaceExceededException e) {
throw new IOException("RowSpaceExceededException in " + this.urlIndexFile.filename() + ": " + e.getMessage());
}
}
}
this.statsDump = null;
if (MemoryControl.shortStatus()) clearCache();
}
public void putMetadata(final URIMetadata entry) throws IOException {
if (entry instanceof URIMetadataNode) {
putDocument(ClientUtils.toSolrInputDocument(((URIMetadataNode) entry).getDocument()));
}
assert entry instanceof URIMetadataRow;
URIMetadataRow row = (URIMetadataRow) entry;
byte[] idb = row.hash();
String id = ASCII.String(idb);
if (this.connectedSolr()) {
try {
if (this.urlIndexFile != null) this.urlIndexFile.remove(idb);
SolrDocument sd = this.solr.get(id);
if (sd == null || (new URIMetadataNode(sd)).isOlder(row)) {
if (this.solrScheme.contains(YaCySchema.ip_s)) {
// ip_s needs a dns lookup which causes blockings during search here
this.solr.add(getSolrScheme().metadata2solr(row));
} else synchronized (this.solr) {
this.solr.add(getSolrScheme().metadata2solr(row));
}
}
} catch (SolrException e) {
throw new IOException(e.getMessage(), e);
}
} else if (this.urlIndexFile != null) {
URIMetadata oldEntry = null;
try {
final Row.Entry oe = this.urlIndexFile.get(idb, false);
oldEntry = (oe == null) ? null : new URIMetadataRow(oe, null, 0);
} catch (final Throwable e) {
Log.logException(e);
oldEntry = null;
}
if (oldEntry == null || oldEntry.isOlder(row)) {
try {
this.urlIndexFile.put(row.toRowEntry());
} catch (final SpaceExceededException e) {
throw new IOException("RowSpaceExceededException in " + this.urlIndexFile.filename() + ": " + e.getMessage());
}
}
}
this.statsDump = null;
if (MemoryControl.shortStatus()) clearCache();
}
public boolean remove(final byte[] urlHash) {
if (urlHash == null) return false;
try {
synchronized (this.solr) {
this.solr.delete(ASCII.String(urlHash));
}
} catch (final Throwable e) {
Log.logException(e);
}
if (this.urlIndexFile != null) try {
final Row.Entry r = this.urlIndexFile.remove(urlHash);
if (r != null) this.statsDump = null;
return r != null;
} catch (final IOException e) {
return false;
}
return false;
}
public boolean exists(final byte[] urlHash) {
if (urlHash == null) return false;
if (this.urlIndexFile != null && this.urlIndexFile.has(urlHash)) return true;
try {
if (this.solr.exists(ASCII.String(urlHash))) return true;
} catch (final Throwable e) {
Log.logException(e);
}
return false;
}
@Override
public Iterator<byte[]> iterator() {
CloneableIterator<byte[]> a = null;
if (this.urlIndexFile != null) try {a = this.urlIndexFile.keys(true, null);} catch (IOException e) {}
final Iterator<String> idi = this.solr.iterator();
CloneableIterator<byte[]> b = new CloneableIterator<byte[]>() {
@Override
public boolean hasNext() {
return idi.hasNext();
}
@Override
public byte[] next() {
String s = idi.next();
return s == null ? null : ASCII.getBytes(s);
}
@Override
public void remove() {
throw new UnsupportedOperationException();
}
@Override
public CloneableIterator<byte[]> clone(Object modifier) {
return this;
}
@Override
public void close() {
}
};
if (a == null) return b;
return new MergeIterator<byte[]>(a, b,
URIMetadataRow.rowdef.objectOrder,
MergeIterator.simpleMerge,
true);
}
public CloneableIterator<URIMetadata> entries() {
// enumerates entry elements
final Iterator<byte[]> ids = iterator();
return new CloneableIterator<URIMetadata>() {
@Override
public CloneableIterator<URIMetadata> clone(final Object secondHash) {
return this;
}
@Override
public final boolean hasNext() {
return ids.hasNext();
}
@Override
public final URIMetadata next() {
byte[] id = ids.next();
if (id == null) return null;
return getMetadata(id);
}
@Override
public final void remove() {
ids.remove();
}
@Override
public void close() {
}
};
}
public List<File> dumpFiles() {
EmbeddedSolrConnector esc = (EmbeddedSolrConnector) this.solr.getSolr0();
File storagePath = esc.getStoragePath().getParentFile();
ArrayList<File> zips = new ArrayList<File>();
for (String p: storagePath.list()) {
if (p.endsWith("zip")) zips.add(new File(storagePath, p));
}
return zips;
}
/**
* create a dump file from the current solr directory
* @return
*/
public File dumpSolr() {
EmbeddedSolrConnector esc = (EmbeddedSolrConnector) this.solr.getSolr0();
int commitWithin = esc.getCommitWithinMs();
File storagePath = esc.getStoragePath();
File zipOut = new File(storagePath.toString() + "_" + GenericFormatter.SHORT_DAY_FORMATTER.format() + ".zip");
synchronized (this.solr) {
this.disconnectLocalSolr();
try {
ZIPWriter.zip(storagePath, zipOut);
} catch (IOException e) {
Log.logException(e);
} finally {
try {
this.connectLocalSolr(commitWithin);
} catch (IOException e) {
Log.logException(e);
}
}
}
return zipOut;
}
/**
* restore a solr dump to the current solr directory
* @param solrDumpZipFile
*/
public void restoreSolr(File solrDumpZipFile) {
EmbeddedSolrConnector esc = (EmbeddedSolrConnector) this.solr.getSolr0();
int commitWithin = esc.getCommitWithinMs();
File storagePath = esc.getStoragePath();
synchronized (this.solr) {
this.disconnectLocalSolr();
try {
ZIPReader.unzip(solrDumpZipFile, storagePath);
} catch (IOException e) {
Log.logException(e);
} finally {
try {
this.connectLocalSolr(commitWithin);
} catch (IOException e) {
Log.logException(e);
}
}
}
}
// export methods
public Export export(final File f, final String filter, final HandleSet set, final int format, final boolean dom) {
if ((this.exportthread != null) && (this.exportthread.isAlive())) {
Log.logWarning("LURL-EXPORT", "cannot start another export thread, already one running");
return this.exportthread;
}
this.exportthread = new Export(f, filter, set, format, dom);
this.exportthread.start();
return this.exportthread;
}
public Export export() {
return this.exportthread;
}
public class Export extends Thread {
private final File f;
private final String filter;
private int count;
private String failure;
private final int format;
private final boolean dom;
private final HandleSet set;
public Export(final File f, final String filter, final HandleSet set, final int format, boolean dom) {
// format: 0=text, 1=html, 2=rss/xml
this.f = f;
this.filter = filter;
this.count = 0;
this.failure = null;
this.format = format;
this.dom = dom;
this.set = set;
if ((dom) && (format == 2)) dom = false;
}
@Override
public void run() {
try {
final File parentf = this.f.getParentFile();
if (parentf != null) parentf.mkdirs();
final PrintWriter pw = new PrintWriter(new BufferedOutputStream(new FileOutputStream(this.f)));
if (this.format == 1) {
pw.println("<html><head></head><body>");
}
if (this.format == 2) {
pw.println("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
pw.println("<?xml-stylesheet type='text/xsl' href='/yacysearch.xsl' version='1.0'?>");
pw.println("<rss version=\"2.0\" xmlns:yacy=\"http://www.yacy.net/\" xmlns:opensearch=\"http://a9.com/-/spec/opensearch/1.1/\" xmlns:atom=\"http://www.w3.org/2005/Atom\">");
pw.println("<channel>");
pw.println("<title>YaCy Peer-to-Peer - Web-Search LURL Export</title>");
pw.println("<description></description>");
pw.println("<link>http://yacy.net</link>");
}
if (this.dom) {
final TreeSet<String> set = domainNameCollector(-1, domainSampleCollector());
for (final String host: set) {
if (!host.matches(this.filter)) continue;
if (this.format == 0) pw.println(host);
if (this.format == 1) pw.println("<a href=\"http://" + host + "\">" + host + "</a><br>");
this.count++;
}
} else {
final Iterator<URIMetadata> i = entries(); // iterates indexURLEntry objects
URIMetadata entry;
String url;
while (i.hasNext()) {
entry = i.next();
if (this.set != null && !this.set.has(entry.hash())) continue;
url = entry.url().toNormalform(true, false);
if (!url.matches(this.filter)) continue;
if (this.format == 0) {
pw.println(url);
}
if (this.format == 1) {
pw.println("<a href=\"" + url + "\">" + CharacterCoding.unicode2xml(entry.dc_title(), true) + "</a><br>");
}
if (this.format == 2) {
pw.println("<item>");
pw.println("<title>" + CharacterCoding.unicode2xml(entry.dc_title(), true) + "</title>");
pw.println("<link>" + MultiProtocolURI.escape(url) + "</link>");
if (!entry.dc_creator().isEmpty()) pw.println("<author>" + CharacterCoding.unicode2xml(entry.dc_creator(), true) + "</author>");
if (!entry.dc_subject().isEmpty()) pw.println("<description>" + CharacterCoding.unicode2xml(entry.dc_subject(), true) + "</description>");
pw.println("<pubDate>" + entry.moddate().toString() + "</pubDate>");
pw.println("<yacy:size>" + entry.size() + "</yacy:size>");
pw.println("<guid isPermaLink=\"false\">" + ASCII.String(entry.hash()) + "</guid>");
pw.println("</item>");
}
this.count++;
}
}
if (this.format == 1) {
pw.println("</body></html>");
}
if (this.format == 2) {
pw.println("</channel>");
pw.println("</rss>");
}
pw.close();
} catch (final IOException e) {
Log.logException(e);
this.failure = e.getMessage();
} catch (final Exception e) {
Log.logException(e);
this.failure = e.getMessage();
}
// terminate process
}
public File file() {
return this.f;
}
public String failed() {
return this.failure;
}
public int count() {
return this.count;
}
}
/**
* collect domain samples: all url hashes from the metadata database is listed and the domain part
* of the url hashes is used to count how many of these domain hashes appear
* @return a map from domain hashes to hash statistics
* @throws IOException
*/
public Map<String, URLHashCounter> domainSampleCollector() throws IOException {
final Map<String, URLHashCounter> map = new HashMap<String, URLHashCounter>();
// first collect all domains and calculate statistics about it
synchronized (this) {
final Iterator<byte[]> i = this.iterator();
String hosthash;
byte[] urlhashb;
URLHashCounter ds;
if (i != null) while (i.hasNext()) {
urlhashb = i.next();
hosthash = ASCII.String(urlhashb, 6, 6);
ds = map.get(hosthash);
if (ds == null) {
ds = new URLHashCounter(urlhashb);
map.put(hosthash, ds);
} else {
ds.count++;
}
}
}
return map;
}
/**
* create a list of domain names in this database
* @param count number of entries or -1 for all
* @param domainSamples a map from domain hashes to hash statistics
* @return a set of domain names, ordered by name of the domains
*/
public TreeSet<String> domainNameCollector(int count, final Map<String, URLHashCounter> domainSamples) {
// collect hashes from all domains
// fetch urls from the database to determine the host in clear text
URIMetadata urlref;
if (count < 0 || count > domainSamples.size()) count = domainSamples.size();
this.statsDump = new ArrayList<HostStat>();
final TreeSet<String> set = new TreeSet<String>();
for (final URLHashCounter hs: domainSamples.values()) {
if (hs == null) continue;
urlref = this.getMetadata(hs.urlhashb);
if (urlref == null || urlref.url() == null || urlref.url().getHost() == null) continue;
set.add(urlref.url().getHost());
count--;
if (count == 0) break;
}
return set;
}
/**
* calculate a score map for url hash samples: each sample is a single url hash
* that stands for all entries for the corresponding domain. The map counts the number
* of occurrences of the domain
* @param domainSamples a map from domain hashes to hash statistics
* @return a map from url hash samples to counters
*/
public ScoreMap<String> urlSampleScores(final Map<String, URLHashCounter> domainSamples) {
final ScoreMap<String> urlSampleScore = new ConcurrentScoreMap<String>();
for (final Map.Entry<String, URLHashCounter> e: domainSamples.entrySet()) {
urlSampleScore.inc(ASCII.String(e.getValue().urlhashb), e.getValue().count);
}
return urlSampleScore;
}
/**
* calculate all domain names for all domain hashes
* @param domainSamples a map from domain hashes to hash statistics
* @return a map from domain hashes to host stats including domain names
*/
public Map<String, HostStat> domainHashResolver(final Map<String, URLHashCounter> domainSamples) {
final HashMap<String, HostStat> hostMap = new HashMap<String, HostStat>();
URIMetadata urlref;
final ScoreMap<String> hosthashScore = new ConcurrentScoreMap<String>();
for (final Map.Entry<String, URLHashCounter> e: domainSamples.entrySet()) {
hosthashScore.inc(ASCII.String(e.getValue().urlhashb, 6, 6), e.getValue().count);
}
DigestURI url;
for (final Map.Entry<String, URLHashCounter> e: domainSamples.entrySet()) {
urlref = this.getMetadata(e.getValue().urlhashb);
url = urlref.url();
hostMap.put(e.getKey(), new HostStat(url.getHost(), url.getPort(), e.getKey(), hosthashScore.get(e.getKey())));
}
return hostMap;
}
public Iterator<HostStat> statistics(int count, final ScoreMap<String> domainScore) {
// prevent too heavy IO.
if (this.statsDump != null && count <= this.statsDump.size()) return this.statsDump.iterator();
// fetch urls from the database to determine the host in clear text
final Iterator<String> j = domainScore.keys(false); // iterate urlhash-examples in reverse order (biggest first)
URIMetadata urlref;
String urlhash;
count += 10; // make some more to prevent that we have to do this again after deletions too soon.
if (count < 0 || domainScore.sizeSmaller(count)) count = domainScore.size();
this.statsDump = new ArrayList<HostStat>();
DigestURI url;
while (j.hasNext()) {
urlhash = j.next();
if (urlhash == null) continue;
urlref = this.getMetadata(ASCII.getBytes(urlhash));
if (urlref == null || urlref.url() == null || urlref.url().getHost() == null) continue;
if (this.statsDump == null) return new ArrayList<HostStat>().iterator(); // some other operation has destroyed the object
url = urlref.url();
this.statsDump.add(new HostStat(url.getHost(), url.getPort(), urlhash.substring(6), domainScore.get(urlhash)));
count--;
if (count == 0) break;
}
// finally return an iterator for the result array
return (this.statsDump == null) ? new ArrayList<HostStat>().iterator() : this.statsDump.iterator();
}
private static class URLHashCounter {
public byte[] urlhashb;
public int count;
public URLHashCounter(final byte[] urlhashb) {
this.urlhashb = urlhashb;
this.count = 1;
}
}
public static class HostStat {
public String hostname, hosthash;
public int port;
public int count;
public HostStat(final String host, final int port, final String urlhashfragment, final int count) {
assert urlhashfragment.length() == 6;
this.hostname = host;
this.port = port;
this.hosthash = urlhashfragment;
this.count = count;
}
}
/**
* using a fragment of the url hash (5 bytes: bytes 6 to 10) it is possible to address all urls from a specific domain
* here such a fragment can be used to delete all these domains at once
* @param hosthash
* @return number of deleted domains
* @throws IOException
*/
public int deleteDomain(final String hosthash) throws IOException {
// first collect all url hashes that belong to the domain
assert hosthash.length() == 6;
// delete in solr
synchronized (this.solr) {
this.solr.deleteByQuery(YaCySchema.host_id_s.name() + ":\"" + hosthash + "\"");
}
// delete in old metadata structure
final ArrayList<String> l = new ArrayList<String>();
synchronized (this) {
final CloneableIterator<byte[]> i = this.urlIndexFile.keys(true, null);
String hash;
while (i != null && i.hasNext()) {
hash = ASCII.String(i.next());
if (hosthash.equals(hash.substring(6))) l.add(hash);
}
}
// then delete the urls using this list
int cnt = 0;
for (final String h: l) {
if (this.urlIndexFile.delete(ASCII.getBytes(h))) cnt++;
}
// finally remove the line with statistics
if (this.statsDump != null) {
final Iterator<HostStat> hsi = this.statsDump.iterator();
HostStat hs;
while (hsi.hasNext()) {
hs = hsi.next();
if (hs.hosthash.equals(hosthash)) {
hsi.remove();
break;
}
}
}
return cnt;
}
}