mirror of
https://github.com/yacy/yacy_search_server.git
synced 2024-09-21 00:00:13 +02:00
194da25a2f
git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@6393 6c8d7289-2bf4-0310-a012-ef5d649a1542
72 lines
2.1 KiB
Java
72 lines
2.1 KiB
Java
// ARC.java
|
|
// an interface for Adaptive Replacement Caches
|
|
// (C) 2009 by Michael Peter Christen; mc@yacy.net, Frankfurt a. M., Germany
|
|
// first published 29.08.2009 on http://yacy.net
|
|
//
|
|
// $LastChangedDate: 2006-04-02 22:40:07 +0200 (So, 02 Apr 2006) $
|
|
// $LastChangedRevision: 1986 $
|
|
// $LastChangedBy: orbiter $
|
|
//
|
|
// LICENSE
|
|
//
|
|
// 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
|
|
|
|
package net.yacy.kelondro.index;
|
|
|
|
/**
|
|
* This is a simple cache using two generations of hashtables to store the content with a LFU strategy.
|
|
* The Algorithm is described in a slightly more complex version as Adaptive Replacement Cache, "ARC".
|
|
* For details see http://www.almaden.ibm.com/cs/people/dmodha/ARC.pdf
|
|
* or http://en.wikipedia.org/wiki/Adaptive_Replacement_Cache
|
|
* This version omits the ghost entry handling which is described in ARC, and keeps both cache levels
|
|
* at the same size.
|
|
*/
|
|
|
|
public interface ARC<K, V> {
|
|
|
|
/**
|
|
* put a value to the cache.
|
|
* @param s
|
|
* @param v
|
|
*/
|
|
public void put(K s, V v);
|
|
|
|
/**
|
|
* get a value from the cache.
|
|
* @param s
|
|
* @return the value
|
|
*/
|
|
public V get(K s);
|
|
|
|
/**
|
|
* check if the map contains the key
|
|
* @param s
|
|
* @return
|
|
*/
|
|
public boolean containsKey(K s);
|
|
|
|
/**
|
|
* remove an entry from the cache
|
|
* @param s
|
|
* @return the old value
|
|
*/
|
|
public V remove(K s);
|
|
|
|
/**
|
|
* clear the cache
|
|
*/
|
|
public void clear();
|
|
}
|