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284 lines
11 KiB
284 lines
11 KiB
// plasmaEURL.java
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// -----------------------
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// part of YaCy
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// (C) by Michael Peter Christen; mc@anomic.de
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// first published on http://www.anomic.de
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// Frankfurt, Germany, 2004
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// last major change: 09.08.2004
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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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//
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// Using this software in any meaning (reading, learning, copying, compiling,
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// running) means that you agree that the Author(s) is (are) not responsible
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// for cost, loss of data or any harm that may be caused directly or indirectly
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// by usage of this softare or this documentation. The usage of this software
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// is on your own risk. The installation and usage (starting/running) of this
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// software may allow other people or application to access your computer and
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// any attached devices and is highly dependent on the configuration of the
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// software which must be done by the user of the software; the author(s) is
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// (are) also not responsible for proper configuration and usage of the
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// software, even if provoked by documentation provided together with
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// the software.
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//
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// Any changes to this file according to the GPL as documented in the file
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// gpl.txt aside this file in the shipment you received can be done to the
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// lines that follows this copyright notice here, but changes must not be
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// done inside the copyright notive above. A re-distribution must contain
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// the intact and unchanged copyright notice.
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// Contributions and changes to the program code must be marked as such.
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// EURL - noticed (known but not loaded) URL's
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package de.anomic.plasma;
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import java.io.File;
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import java.io.IOException;
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import java.net.URL;
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import java.util.Date;
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import java.util.Enumeration;
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import java.util.HashMap;
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import java.util.LinkedList;
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import java.util.Iterator;
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import de.anomic.kelondro.kelondroBase64Order;
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import de.anomic.kelondro.kelondroTree;
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import de.anomic.tools.bitfield;
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public class plasmaCrawlEURL extends plasmaURL {
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private LinkedList rejectedStack = new LinkedList(); // strings: url
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public plasmaCrawlEURL(File cachePath, int bufferkb) {
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super();
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int[] ce = {
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urlHashLength, // the url's hash
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urlHashLength, // the url's referrer hash
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urlHashLength, // the crawling initiator
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urlHashLength, // the crawling executor
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urlStringLength, // the url as string
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urlNameLength, // the name of the url, from anchor tag <a>name</a>
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urlDateLength, // the time when the url was first time appeared
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urlDateLength, // the time when the url was last time tried to load
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urlRetryLength, // number of load retries
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urlErrorLength, // string describing load failure
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urlFlagLength // extra space
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};
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if (cachePath.exists()) try {
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// open existing cache
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urlHashCache = new kelondroTree(cachePath, bufferkb * 0x400, kelondroTree.defaultObjectCachePercent);
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} catch (IOException e) {
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cachePath.delete();
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urlHashCache = new kelondroTree(cachePath, bufferkb * 0x400, kelondroTree.defaultObjectCachePercent, ce, true);
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} else {
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// create new cache
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cachePath.getParentFile().mkdirs();
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urlHashCache = new kelondroTree(cachePath, bufferkb * 0x400, kelondroTree.defaultObjectCachePercent, ce, true);
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}
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}
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public synchronized Entry newEntry(URL url, String referrer, String initiator, String executor,
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String name, String failreason, bitfield flags, boolean retry) {
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if ((referrer == null) || (referrer.length() < urlHashLength)) referrer = dummyHash;
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if ((initiator == null) || (initiator.length() < urlHashLength)) initiator = dummyHash;
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if ((executor == null) || (executor.length() < urlHashLength)) executor = dummyHash;
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if (failreason == null) failreason = "unknown";
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// create a stack entry
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HashMap map = new HashMap();
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map.put("url", url);
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map.put("referrer", referrer);
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map.put("initiator", initiator);
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map.put("executor", executor);
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map.put("name", name);
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map.put("failreason", failreason);
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map.put("flags", flags);
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rejectedStack.add(map);
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Entry e = new Entry(url, referrer, initiator, executor, name, failreason, flags);
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// put in table
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if (retry) e.store();
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return e;
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}
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public synchronized Entry getEntry(String hash) throws IOException {
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return new Entry(hash);
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}
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public void clearStack() {
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rejectedStack.clear();
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}
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public int stackSize() {
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return rejectedStack.size();
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}
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public Entry getStack(int pos) {
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HashMap m = (HashMap) rejectedStack.get(pos);
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return new Entry((URL) m.get("url"), (String) m.get("referrer"), (String) m.get("initiator"), (String) m.get("executor"),
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(String) m.get("name"), (String) m.get("failreason"), (bitfield) m.get("flags"));
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}
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public class Entry {
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private String hash; // the url's hash
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private String referrer; // the url's referrer hash
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private String initiator; // the crawling initiator
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private String executor; // the crawling initiator
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private URL 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 Date initdate; // the time when the url was first time appeared
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private Date trydate; // the time when the url was last time tried to load
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private int trycount; // number of tryings
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private String failreason; // string describing reason for load fail
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private bitfield flags; // extra space
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public Entry(URL url, String referrer, String initiator, String executor, String name, String failreason, bitfield flags) {
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// create new entry and store it into database
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this.hash = urlHash(url);
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this.referrer = (referrer == null) ? dummyHash : referrer;
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this.initiator = initiator;
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this.executor = executor;
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this.url = url;
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this.name = name;
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this.initdate = new Date();
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this.trydate = new Date();
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this.trycount = 0;
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this.failreason = failreason;
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this.flags = flags;
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}
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public Entry(String hash) throws IOException {
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// generates an plasmaEURLEntry using the url hash
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// to speed up the access, the url-hashes are buffered
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// in the hash cache.
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// we have two options to find the url:
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// - look into the hash cache
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// - look into the filed properties
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// if the url cannot be found, this returns null
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this.hash = hash;
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byte[][] entry = urlHashCache.get(hash.getBytes());
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if (entry != null) {
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this.referrer = new String(entry[1], "UTF-8");
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this.initiator = new String(entry[2], "UTF-8");
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this.executor = new String(entry[3], "UTF-8");
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this.url = new URL(new String(entry[4], "UTF-8").trim());
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this.name = new String(entry[5], "UTF-8").trim();
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this.initdate = new Date(86400000 * kelondroBase64Order.enhancedCoder.decodeLong(new String(entry[6], "UTF-8")));
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this.trydate = new Date(86400000 * kelondroBase64Order.enhancedCoder.decodeLong(new String(entry[7], "UTF-8")));
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this.trycount = (int) kelondroBase64Order.enhancedCoder.decodeLong(new String(entry[8], "UTF-8"));
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this.failreason = new String(entry[9], "UTF-8");
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this.flags = new bitfield(entry[10]);
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return;
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}
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}
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private void store() {
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// stores the values from the object variables into the database
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String initdatestr = kelondroBase64Order.enhancedCoder.encodeLong(initdate.getTime() / 86400000, urlDateLength);
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String trydatestr = kelondroBase64Order.enhancedCoder.encodeLong(trydate.getTime() / 86400000, urlDateLength);
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// store the hash in the hash cache
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try {
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// even if the entry exists, we simply overwrite it
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byte[][] entry = new byte[][] {
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this.hash.getBytes(),
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this.referrer.getBytes(),
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this.initiator.getBytes(),
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this.executor.getBytes(),
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this.url.toString().getBytes(),
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this.name.getBytes(),
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initdatestr.getBytes(),
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trydatestr.getBytes(),
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kelondroBase64Order.enhancedCoder.encodeLong(this.trycount, urlRetryLength).getBytes(),
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this.failreason.getBytes(),
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this.flags.getBytes()
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};
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urlHashCache.put(entry);
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} catch (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 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.hash;
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}
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public String referrer() {
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return this.referrer;
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}
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public URL url() {
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return url;
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}
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public Date initdate() {
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return trydate;
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}
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public Date trydate() {
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return trydate;
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}
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public String initiator() {
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// return the creator's hash
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return initiator;
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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 name() {
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// return the creator's hash
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return name;
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}
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public String failreason() {
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return failreason;
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}
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}
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public class kenum implements Enumeration {
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// enumerates entry elements
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Iterator i;
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public kenum(boolean up, boolean rotating) throws IOException {
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i = urlHashCache.rows(up, rotating, null);
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}
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public boolean hasMoreElements() {
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return i.hasNext();
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}
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public Object nextElement() {
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try {
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return new Entry(new String(((byte[][]) i.next())[0]));
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} catch (IOException e) {
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return null;
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}
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}
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}
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public Enumeration elements(boolean up, boolean rotating) throws IOException {
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// enumerates entry elements
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return new kenum(up, rotating);
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}
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}
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