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da86f150ab
This organizes all urls to be loaded in separate queues for each host. Each host separates the crawl depth into it's own queue. The primary rule for urls taken from any queue is, that the crawl depth is minimal. This produces a crawl depth which is identical to the clickdepth. Furthermorem the crawl is able to create a much better balancing over all hosts which is fair to all hosts that are in the queue. This process will create a very large number of files for wide crawls in the QUEUES folder: for each host a directory, for each crawl depth a file inside the directory. A crawl with maxdepth = 4 will be able to create 10.000s of files. To be able to use that many file readers, it was necessary to implement a new index data structure which opens the file only if an access is wanted (OnDemandOpenFileIndex). The usage of such on-demand file reader shall prevent that the number of file pointers is over the system limit, which is usually about 10.000 open files. Some parts of YaCy had to be adopted to handle the crawl depth number correctly. The logging and the IndexCreateQueues servlet had to be adopted to show the crawl queues differently, because the host name is attached to the port on the host to differentiate between http, https, and ftp services.
109 lines
4.0 KiB
Java
109 lines
4.0 KiB
Java
//bzipParser.java
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//------------------------
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//part of YaCy
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//(C) by Michael Peter Christen; mc@yacy.net
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//first published on http://www.anomic.de
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//Frankfurt, Germany, 2005
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//
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//this file is contributed by Martin Thelian
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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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//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 net.yacy.document.parser;
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import java.io.File;
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import java.io.FileOutputStream;
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import java.io.InputStream;
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import net.yacy.cora.document.id.AnchorURL;
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import net.yacy.document.AbstractParser;
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import net.yacy.document.Document;
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import net.yacy.document.Parser;
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import net.yacy.document.TextParser;
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import net.yacy.kelondro.util.FileUtils;
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import org.apache.commons.compress.compressors.bzip2.BZip2CompressorInputStream;
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public class bzipParser extends AbstractParser implements Parser {
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public bzipParser() {
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super("Bzip 2 UNIX Compressed File Parser");
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this.SUPPORTED_EXTENSIONS.add("bz2");
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this.SUPPORTED_EXTENSIONS.add("tbz");
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this.SUPPORTED_EXTENSIONS.add("tbz2");
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this.SUPPORTED_MIME_TYPES.add("application/x-bzip2");
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this.SUPPORTED_MIME_TYPES.add("application/bzip2");
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this.SUPPORTED_MIME_TYPES.add("application/x-bz2");
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this.SUPPORTED_MIME_TYPES.add("application/x-bzip");
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this.SUPPORTED_MIME_TYPES.add("application/x-stuffit");
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}
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@Override
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public Document[] parse(final AnchorURL location, final String mimeType,
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final String charset, final InputStream source)
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throws Parser.Failure, InterruptedException {
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File tempFile = null;
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Document[] docs;
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try {
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/*
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* First we have to consume the first two char from the stream. Otherwise
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* the bzip decompression will fail with a nullpointerException!
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*/
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int b = source.read();
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if (b != 'B') {
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throw new Exception("Invalid bz2 content.");
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}
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b = source.read();
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if (b != 'Z') {
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throw new Exception("Invalid bz2 content.");
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}
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int read = 0;
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final byte[] data = new byte[1024];
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final BZip2CompressorInputStream zippedContent = new BZip2CompressorInputStream(source);
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tempFile = File.createTempFile("bunzip","tmp");
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tempFile.deleteOnExit();
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// creating a temp file to store the uncompressed data
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final FileOutputStream out = new FileOutputStream(tempFile);
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// reading gzip file and store it uncompressed
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while((read = zippedContent.read(data, 0, 1024)) != -1) {
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out.write(data, 0, read);
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}
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zippedContent.close();
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out.close();
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// creating a new parser class to parse the unzipped content
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docs = TextParser.parseSource(location, null, null, 999, tempFile);
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} catch (final Exception e) {
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if (e instanceof InterruptedException) throw (InterruptedException) e;
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if (e instanceof Parser.Failure) throw (Parser.Failure) e;
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throw new Parser.Failure("Unexpected error while parsing bzip file. " + e.getMessage(),location);
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} finally {
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if (tempFile != null) FileUtils.deletedelete(tempFile);
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}
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return docs;
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}
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}
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