yacy_search_server/source/de/anomic/kelondro/kelondroIndex.java

// kelondroIndex.java
// ------------------
// part of the Kelondro Database
// (C) by Michael Peter Christen; mc@anomic.de
// first published on http://www.anomic.de
// Frankfurt, Germany, 2005
// created: 26.10.2005
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
//
// Using this software in any meaning (reading, learning, copying, compiling,
// running) means that you agree that the Author(s) is (are) not responsible
// for cost, loss of data or any harm that may be caused directly or indirectly
// by usage of this softare or this documentation. The usage of this software
// is on your own risk. The installation and usage (starting/running) of this
// software may allow other people or application to access your computer and
// any attached devices and is highly dependent on the configuration of the
// software which must be done by the user of the software; the author(s) is
// (are) also not responsible for proper configuration and usage of the
// software, even if provoked by documentation provided together with
// the software.
//
// Any changes to this file according to the GPL as documented in the file
// gpl.txt aside this file in the shipment you received can be done to the
// lines that follows this copyright notice here, but changes must not be
// done inside the copyright notive above. A re-distribution must contain
// the intact and unchanged copyright notice.
// Contributions and changes to the program code must be marked as such.

/* A kelondroIndex is a table with indexed access on the first column
   Elements may be selected from the table with logarithmic computation time
   using the get-method. Inserts have also the same computation order and
   can be done with the put-method.
 
   The kelondro Database provides two implementations of this interface:
   kelondroTree and kelondroHashtable
 */

package de.anomic.kelondro;

import java.io.IOException;
import java.util.Date;
import java.util.Iterator;

public interface kelondroIndex {

    public int size() throws IOException;
    public kelondroProfile profile();
    public kelondroRow row() throws IOException;
    public boolean has(byte[] key) throws IOException; // use this only if there is no get in case that has returns true
    public kelondroRow.Entry get(byte[] key) throws IOException;
    public kelondroRow.Entry put(kelondroRow.Entry row) throws IOException;
    public kelondroRow.Entry put(kelondroRow.Entry row, Date entryDate) throws IOException;
    public void addUnique(kelondroRow.Entry row) throws IOException; // no double-check
    public void addUnique(kelondroRow.Entry row, Date entryDate) throws IOException; // no double-check
    public kelondroRow.Entry remove(byte[] key) throws IOException;
    public kelondroRow.Entry removeOne() throws IOException;
    public Iterator rows(boolean up, boolean rotating, byte[] firstKey) throws IOException;
    public void close() throws IOException;
    
    // statistics for node caches
    public int cacheNodeChunkSize(); // the size that the node cache uses for a single entry
    public int[] cacheNodeStatus(); // a collection of different node cache status values
    
    // statistics for object caches
    public int cacheObjectChunkSize(); // the size of an object entry
    public long[] cacheObjectStatus(); // a collection of different object cache status values
}