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287 lines
10 KiB
287 lines
10 KiB
// plasmaCrawlZURL.java
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// (C) 2007 by Michael Peter Christen; mc@yacy.net, Frankfurt a. M., Germany
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// first published 15.03.2007 on http://www.anomic.de
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//
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// This is a part of YaCy, a peer-to-peer based web search engine
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//
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// $LastChangedDate: 2006-04-02 22:40:07 +0200 (So, 02 Apr 2006) $
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// $LastChangedRevision: 1986 $
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// $LastChangedBy: orbiter $
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//
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// LICENSE
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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package de.anomic.crawler;
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import java.io.File;
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import java.io.IOException;
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import java.util.Date;
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import java.util.Iterator;
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import java.util.LinkedList;
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import de.anomic.kelondro.index.Row;
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import de.anomic.kelondro.index.RowSet;
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import de.anomic.kelondro.index.ObjectIndex;
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import de.anomic.kelondro.order.Base64Order;
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import de.anomic.kelondro.table.EcoTable;
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import de.anomic.kelondro.table.FlexWidthArray;
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import de.anomic.kelondro.util.FileUtils;
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import de.anomic.yacy.yacySeedDB;
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import de.anomic.yacy.yacyURL;
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public class ZURL {
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private static final int EcoFSBufferSize = 200;
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private static final int maxStackSize = 300;
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public final static Row rowdef = new Row(
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"String urlhash-" + yacySeedDB.commonHashLength + ", " + // the url's hash
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"String executor-" + yacySeedDB.commonHashLength + ", " + // the crawling executor
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"Cardinal workdate-8 {b256}, " + // the time when the url was last time tried to load
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"Cardinal workcount-4 {b256}, " + // number of load retries
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"String anycause-132, " + // string describing load failure
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"byte[] entry-" + CrawlEntry.rowdef.objectsize, // extra space
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Base64Order.enhancedCoder
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);
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// the class object
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private final ObjectIndex urlIndex;
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private final LinkedList<String> stack;
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public ZURL(final File cachePath, final String tablename, final boolean startWithEmptyFile) {
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// creates a new ZURL in a file
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cachePath.mkdirs();
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final File f = new File(cachePath, tablename);
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if (startWithEmptyFile) {
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if (f.exists()) {
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if (f.isDirectory()) FlexWidthArray.delete(cachePath, tablename); else FileUtils.deletedelete(f);
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}
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}
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this.urlIndex = new EcoTable(f, rowdef, EcoTable.tailCacheDenyUsage, EcoFSBufferSize, 0);
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//urlIndex = new kelondroFlexTable(cachePath, tablename, -1, rowdef, 0, true);
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this.stack = new LinkedList<String>();
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}
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public ZURL() {
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// creates a new ZUR in RAM
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this.urlIndex = new RowSet(rowdef, 0);
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this.stack = new LinkedList<String>();
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}
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public int size() {
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return urlIndex.size() ;
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}
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public void clear() throws IOException {
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if (urlIndex != null) urlIndex.clear();
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if (stack != null) stack.clear();
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}
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public void close() {
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try {this.clear();} catch (IOException e) {}
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if (urlIndex != null) urlIndex.close();
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}
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public synchronized Entry newEntry(
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final CrawlEntry bentry,
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final String executor,
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final Date workdate,
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final int workcount,
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String anycause) {
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assert executor != null;
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assert executor.length() > 0;
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if (anycause == null) anycause = "unknown";
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return new Entry(bentry, executor, workdate, workcount, anycause);
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}
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public boolean remove(final String hash) {
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if (hash == null) return false;
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//System.out.println("*** DEBUG ZURL " + this.urlIndex.filename() + " remove " + hash);
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try {
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urlIndex.remove(hash.getBytes());
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return true;
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} catch (final IOException e) {
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return false;
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}
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}
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public synchronized void push(final Entry e) {
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stack.add(e.hash());
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while (stack.size() > maxStackSize) stack.removeFirst();
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}
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public Entry top(final int pos) {
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String urlhash;
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synchronized (stack) {
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if (pos >= stack.size()) return null;
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urlhash = stack.get(pos);
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}
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if (urlhash == null) return null;
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return getEntry(urlhash);
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}
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public synchronized Entry getEntry(final String urlhash) {
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try {
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if (urlIndex == null) return null;
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//System.out.println("*** DEBUG ZURL " + this.urlIndex.filename() + " get " + urlhash);
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final Row.Entry entry = urlIndex.get(urlhash.getBytes());
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if (entry == null) return null;
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return new Entry(entry);
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} catch (final IOException e) {
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e.printStackTrace();
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return null;
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}
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}
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public boolean exists(final String urlHash) {
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return urlIndex.has(urlHash.getBytes());
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}
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public void clearStack() {
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stack.clear();
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}
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public int stackSize() {
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return stack.size();
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}
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public class Entry {
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CrawlEntry bentry; // the balancer entry
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private final String executor; // the crawling executor
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private final Date workdate; // the time when the url was last time tried to load
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private final int workcount; // number of tryings
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private final String anycause; // string describing reason for load fail
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private boolean stored;
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public Entry(
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final CrawlEntry bentry,
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final String executor,
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final Date workdate,
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final int workcount,
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final String anycause) {
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// create new entry
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assert bentry != null;
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assert executor != null;
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this.bentry = bentry;
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this.executor = executor;
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this.workdate = (workdate == null) ? new Date() : workdate;
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this.workcount = workcount;
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this.anycause = (anycause == null) ? "" : anycause;
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stored = false;
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}
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public Entry(final Row.Entry entry) throws IOException {
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assert (entry != null);
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this.executor = entry.getColString(1, "UTF-8");
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this.workdate = new Date(entry.getColLong(2));
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this.workcount = (int) entry.getColLong(3);
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this.anycause = entry.getColString(4, "UTF-8");
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this.bentry = new CrawlEntry(CrawlEntry.rowdef.newEntry(entry.getColBytes(5)));
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assert ((new String(entry.getColBytes(0))).equals(bentry.url().hash()));
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this.stored = true;
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return;
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}
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public void store() {
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// stores the values from the object variables into the database
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if (this.stored) return;
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if (this.bentry == null) return;
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final Row.Entry newrow = rowdef.newEntry();
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newrow.setCol(0, this.bentry.url().hash().getBytes());
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newrow.setCol(1, this.executor.getBytes());
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newrow.setCol(2, this.workdate.getTime());
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newrow.setCol(3, this.workcount);
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newrow.setCol(4, this.anycause.getBytes());
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newrow.setCol(5, this.bentry.toRow().bytes());
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try {
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//System.out.println("*** DEBUG ZURL " + urlIndex.filename() + " store " + newrow.getColString(0, "UTF-8"));
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if (urlIndex != null) urlIndex.put(newrow);
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this.stored = true;
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} catch (final IOException e) {
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System.out.println("INTERNAL ERROR AT plasmaEURL:url2hash:" + e.toString());
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}
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}
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public yacyURL url() {
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return this.bentry.url();
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}
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public String initiator() {
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return this.bentry.initiator();
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}
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public String hash() {
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// return a url-hash, based on the md5 algorithm
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// the result is a String of 12 bytes within a 72-bit space
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// (each byte has an 6-bit range)
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// that should be enough for all web pages on the world
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return this.bentry.url().hash();
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}
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public Date workdate() {
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return workdate;
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}
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public String executor() {
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// return the creator's hash
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return executor;
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}
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public String anycause() {
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return anycause;
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}
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}
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public class kiter implements Iterator<Entry> {
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// enumerates entry elements
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Iterator<Row.Entry> i;
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boolean error = false;
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public kiter(final boolean up, final String firstHash) throws IOException {
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i = urlIndex.rows(up, (firstHash == null) ? null : firstHash.getBytes());
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error = false;
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}
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public boolean hasNext() {
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if (error) return false;
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return i.hasNext();
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}
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public Entry next() throws RuntimeException {
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final Row.Entry e = i.next();
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if (e == null) return null;
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try {
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return new Entry(e);
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} catch (final IOException ex) {
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throw new RuntimeException("error '" + ex.getMessage() + "' for hash " + e.getColString(0, null));
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}
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}
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public void remove() {
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i.remove();
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}
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}
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public Iterator<Entry> entries(final boolean up, final String firstHash) throws IOException {
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// enumerates entry elements
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return new kiter(up, firstHash);
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}
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}
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