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1e6d12f146
- introduced a new BLOB file format: kelondroBLOBHeap. This is a flat file with an index in RAM. very similar to the eco-tables, but with flexible value sizes. It will replace the kelondroBLOBTree, which is based on a kelondroTree, a file-AVL-based index data structure. - the HTCACHE header file was replaced by the new blob heap file structure - the robots.txt file was replaced by the new blob heap file structure - the robots parser was enhanced (bugfixing for double-loading of the same robots.txt) - other BLOB-dependent data structures were prepared to use also the new BLOB heap - fixed a bug in the snippet fetch process: the file header was not written to the header index There should now be less IO during snippet fetch and during crawling git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@4978 6c8d7289-2bf4-0310-a012-ef5d649a1542
106 lines
2.8 KiB
Java
106 lines
2.8 KiB
Java
// kelondroBLOB.java
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// (C) 2008 by Michael Peter Christen; mc@yacy.net, Frankfurt a. M., Germany
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// first published 08.06.2008 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: 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.kelondro;
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import java.io.IOException;
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public interface kelondroBLOB {
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/**
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* ask for the length of the primary key
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* @return the length of the key
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*/
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public int keylength();
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/**
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* clears the content of the database
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* @throws IOException
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*/
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public void clear() throws IOException;
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/**
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* ask for the number of entries
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* @return the number of entries in the table
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*/
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public int size();
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/**
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* iterator over all keys
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* @param up
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* @param rotating
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* @return
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* @throws IOException
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*/
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public kelondroCloneableIterator<byte[]> keys(boolean up, boolean rotating) throws IOException;
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/**
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* iterate over all keys
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* @param up
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* @param firstKey
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* @return
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* @throws IOException
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*/
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public kelondroCloneableIterator<byte[]> keys(boolean up, byte[] firstKey) throws IOException;
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/**
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* check if a specific key is in the database
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* @param key the primary key
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* @return
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* @throws IOException
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*/
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public boolean has(byte[] key) throws IOException;
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/**
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* retrieve the whole BLOB from the table
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* @param key the primary key
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* @return
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* @throws IOException
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*/
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public byte[] get(byte[] key) throws IOException;
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/**
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* write a whole byte array as BLOB to the table
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* @param key the primary key
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* @param b
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* @throws IOException
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*/
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public void put(byte[] key, byte[] b) throws IOException;
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/**
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* remove a BLOB
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* @param key the primary key
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* @throws IOException
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*/
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public void remove(byte[] key) throws IOException;
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/**
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* close the BLOB table
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*/
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public void close();
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}
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