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ea6c9e9b07
(they are typically small compared to idx allowing to use smaller buffersize -> set to 16k records)
118 lines
3.6 KiB
Java
118 lines
3.6 KiB
Java
// Gap.java
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// (C) 2008 by Michael Peter Christen; mc@yacy.net, Frankfurt a. M., Germany
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// first published 30.12.2008 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 net.yacy.kelondro.blob;
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import java.io.BufferedInputStream;
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import java.io.BufferedOutputStream;
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import java.io.DataInputStream;
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import java.io.DataOutputStream;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.util.Iterator;
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import java.util.Map;
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import java.util.TreeMap;
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/**
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* this is an extension of a set of {seek, size} pairs
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* it is used to denote the position and space of free records
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* The class provides methods to dump such a set to a file and read it again
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*/
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public class Gap extends TreeMap<Long, Integer> {
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private static final long serialVersionUID = 1L;
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public Gap() {
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super();
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}
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/**
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* initialize a kelondroBLOBGap with the content of a dump
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* @param file
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* @throws IOException
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* @throws IOException
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*/
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public Gap(final File file) throws IOException {
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super();
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// read the index dump and fill the index
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DataInputStream is;
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try {
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is = new DataInputStream(new BufferedInputStream(new FileInputStream(file), (Integer.SIZE + Long.SIZE) * 1024)); // equals 16*1024*recordsize
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} catch (final OutOfMemoryError e) {
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is = new DataInputStream(new FileInputStream(file));
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}
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long p;
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int l;
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while (true) {
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try {
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p = is.readLong();
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l = is.readInt();
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this.put(Long.valueOf(p), Integer.valueOf(l));
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} catch (final IOException e) {
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break;
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}
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}
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is.close();
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is = null;
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}
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/**
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* dump the set to a file
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* @param file
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* @return
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* @throws IOException
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*/
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public int dump(File file) throws IOException {
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File tmp = new File(file.getParentFile(), file.getName() + ".prt");
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Iterator<Map.Entry<Long, Integer>> i = this.entrySet().iterator();
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DataOutputStream os;
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try {
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os = new DataOutputStream(new BufferedOutputStream(new FileOutputStream(tmp), (Integer.SIZE + Long.SIZE) * 1024)); // = 16*1024*recordsize
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} catch (final OutOfMemoryError e) {
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os = new DataOutputStream(new FileOutputStream(tmp));
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}
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int c = 0;
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Map.Entry<Long, Integer> e;
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while (i.hasNext()) {
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e = i.next();
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os.writeLong(e.getKey().longValue());
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os.writeInt(e.getValue().intValue());
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c++;
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}
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os.flush();
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os.close();
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tmp.renameTo(file);
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assert file.exists() : file.toString();
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assert !tmp.exists() : tmp.toString();
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return c;
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}
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}
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