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263 lines
11 KiB
263 lines
11 KiB
// Request.java
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// (C) 2007 by Michael Peter Christen; mc@yacy.net, Frankfurt a. M., Germany
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// first published 14.03.2007 on http://yacy.net
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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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// $LastChangedDate$
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// $LastChangedRevision$
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// $LastChangedBy$
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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.retrieval;
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import java.io.IOException;
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import java.util.Date;
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import net.yacy.cora.document.UTF8;
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import net.yacy.kelondro.data.meta.DigestURI;
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import net.yacy.kelondro.data.word.Word;
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import net.yacy.kelondro.index.Row;
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import net.yacy.kelondro.order.Base64Order;
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import net.yacy.kelondro.order.Bitfield;
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import net.yacy.kelondro.order.NaturalOrder;
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import net.yacy.kelondro.workflow.WorkflowJob;
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public class Request extends WorkflowJob {
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// row definition for balancer-related NURL-entries
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public final static Row rowdef = new Row(
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"String urlhash-" + Word.commonHashLength + ", " + // the url's hash
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"String initiator-" + Word.commonHashLength + ", " + // the crawling initiator
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"String urlstring-256, " + // the url as string
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"String refhash-" + Word.commonHashLength + ", " + // the url's referrer hash
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"String urlname-80, " + // the name of the url, from anchor tag <a>name</a>
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"Cardinal appdate-8 {b256}, " + // the date of the resource; either file date or first appearance
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"String profile-" + Word.commonHashLength + ", " + // the name of the prefetch profile handle
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"Cardinal depth-2 {b256}, " + // the prefetch depth so far, starts at 0
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"Cardinal parentbr-3 {b256}, " + // number of anchors of the parent
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"Cardinal forkfactor-4 {b256}, " + // sum of anchors of all ancestors
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"byte[] flags-4, " + // flags
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"Cardinal handle-4 {b256}, " + // handle (NOT USED)
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"Cardinal loaddate-8 {b256}, " + // NOT USED
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"Cardinal lastmodified-8 {b256}, " + // NOT USED
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"Cardinal size-8 {b256}", // size of resource in bytes (if known) or 0 if not known
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Base64Order.enhancedCoder
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);
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private byte[] initiator; // the initiator hash, is NULL or "" if it is the own proxy;
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// if this is generated by a crawl, the own peer hash in entered
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private byte[] refhash; // the url's referrer hash
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private DigestURI url; // the url as string
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private String name; // the name of the url, from anchor tag <a>name</a>
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private long appdate; // the time when the url was first time appeared.
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private String profileHandle; // the name of the fetch profile
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private int depth; // the prefetch depth so far, starts at 0
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private int anchors; // number of anchors of the parent
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private int forkfactor; // sum of anchors of all ancestors
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private Bitfield flags;
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private long size; // size of resource in bytes (if known) or 0 if not known
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private String statusMessage;
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private int initialHash; // to provide a object hash that does not change even if the url changes because of redirection
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/**
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* convenience method for 'full' request object
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* @param url
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* @param referrerhash
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*/
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public Request(final DigestURI url, final byte[] referrerhash) {
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this(null, url, referrerhash, null, null, null, 0, 0, 0, 0);
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}
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/**
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* A Request Entry is a object that is created to provide
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* all information to load a specific resource.
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*
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* @param initiator the hash of the initiator peer
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* @param url the {@link URL} to crawl
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* @param referrer the hash of the referrer URL
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* @param name the name of the document to crawl
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* @param appdate the time when the url was first time appeared
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* @param profileHandle the name of the prefetch profile. This must not be null!
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* @param depth the crawling depth of the entry
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* @param anchors number of anchors of the parent
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* @param forkfactor sum of anchors of all ancestors
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*/
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public Request(
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final byte[] initiator,
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final DigestURI url,
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final byte[] referrerhash,
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final String name,
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final Date appdate,
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final String profileHandle,
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final int depth,
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final int anchors,
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final int forkfactor,
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final long size
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) {
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// create new entry and store it into database
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assert url != null;
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assert profileHandle == null || profileHandle.length() == Word.commonHashLength : profileHandle + " != " + Word.commonHashLength;
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url.removeRef(); // remove anchor reference
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this.initiator = (initiator == null) ? null : ((initiator.length == 0) ? null : initiator);
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this.url = url;
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this.refhash = referrerhash;
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this.name = (name == null) ? "" : name;
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this.appdate = (appdate == null) ? 0 : appdate.getTime();
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this.profileHandle = profileHandle; // must not be null
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this.depth = depth;
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this.anchors = anchors;
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this.forkfactor = forkfactor;
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this.flags = new Bitfield(rowdef.width(10));
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this.statusMessage = "loaded(args)";
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this.initialHash = url.hashCode();
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this.status = WorkflowJob.STATUS_INITIATED;
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this.size = size;
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}
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public Request(final Row.Entry entry) throws IOException {
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assert (entry != null);
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insertEntry(entry);
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}
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private void insertEntry(final Row.Entry entry) throws IOException {
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final String urlstring = entry.getColString(2);
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if (urlstring == null) throw new IOException ("url string is null");
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this.initiator = entry.getColBytes(1, true);
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this.initiator = (initiator == null) ? null : ((initiator.length == 0) ? null : initiator);
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this.url = new DigestURI(urlstring, entry.getPrimaryKeyBytes());
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this.refhash = (entry.empty(3)) ? null : entry.getColBytes(3, true);
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this.name = (entry.empty(4)) ? "" : entry.getColString(4).trim();
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this.appdate = entry.getColLong(5);
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this.profileHandle = (entry.empty(6)) ? null : entry.getColString(6).trim();
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this.depth = (int) entry.getColLong(7);
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this.anchors = (int) entry.getColLong(8);
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this.forkfactor = (int) entry.getColLong(9);
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this.flags = new Bitfield(entry.getColBytes(10, true));
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//this.loaddate = entry.getColLong(12);
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//this.lastmodified = entry.getColLong(13);
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this.size = entry.getColLong(14);
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this.statusMessage = "loaded(kelondroRow.Entry)";
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this.initialHash = url.hashCode();
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return;
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}
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public int hashCode() {
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// overloads Object.hashCode()
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return this.initialHash;
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}
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public void setStatus(final String s, int code) {
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//System.out.println("***DEBUG*** crawler status " + s + ", " + code + " for " + this.url.toNormalform(true, false));
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this.statusMessage = s;
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this.status = code;
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}
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public String getStatus() {
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return this.statusMessage;
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}
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public Row.Entry toRow() {
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final byte[] appdatestr = NaturalOrder.encodeLong(appdate, rowdef.width(5));
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final byte[] loaddatestr = NaturalOrder.encodeLong(0 /*loaddate*/, rowdef.width(12));
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final byte[] serverdatestr = NaturalOrder.encodeLong(0 /*lastmodified*/, rowdef.width(13));
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final byte[] sizestr = NaturalOrder.encodeLong(this.size, rowdef.width(14));
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// store the hash in the hash cache
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byte[] namebytes;
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namebytes = UTF8.getBytes(this.name);
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final byte[][] entry = new byte[][] {
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this.url.hash(),
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initiator,
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this.url.toString().getBytes(),
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this.refhash,
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namebytes,
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appdatestr,
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(this.profileHandle == null) ? null : this.profileHandle.getBytes(),
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NaturalOrder.encodeLong(this.depth, rowdef.width(7)),
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NaturalOrder.encodeLong(this.anchors, rowdef.width(8)),
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NaturalOrder.encodeLong(this.forkfactor, rowdef.width(9)),
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this.flags.bytes(),
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NaturalOrder.encodeLong(0, rowdef.width(11)),
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loaddatestr,
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serverdatestr,
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sizestr};
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return rowdef.newEntry(entry);
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}
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public DigestURI url() {
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// the url
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return url;
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}
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public void redirectURL(final DigestURI redirectedURL) {
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// replace old URL by new one. This should only be used in case of url redirection
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this.url = redirectedURL;
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}
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public byte[] referrerhash() {
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// the urlhash of a referer url
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return this.refhash;
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}
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public byte[] initiator() {
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// returns the hash of the initiating peer
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return initiator;
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}
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public boolean proxy() {
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// true when the url was retrieved using the proxy
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return (initiator() == null || initiator().length == 0);
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}
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public Date appdate() {
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// the date when the url appeared first
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return new Date(this.appdate);
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}
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/*
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public Date loaddate() {
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// the date when the url was loaded
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return new Date(this.loaddate);
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}
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public Date lastmodified() {
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// the date that the server returned as document date
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return new Date(this.lastmodified);
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}
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*/
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public long size() {
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// the date that the client (browser) send as ifModifiedSince in proxy mode
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return this.size;
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}
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public String name() {
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// return the anchor name (text inside <a> tag)
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return this.name;
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}
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public int depth() {
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// crawl depth where the url appeared
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return this.depth;
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}
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public String profileHandle() {
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// the handle of the crawl profile
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assert profileHandle.length() == Word.commonHashLength : profileHandle + " != " + Word.commonHashLength;
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return this.profileHandle;
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}
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} |