package ch.usi.da.paxos.storage;
import java.util.LinkedHashMap;
import java.util.Map;
import ch.usi.da.paxos.api.StableStorage;
/*
* Copyright (c) 2013 Università della Svizzera italiana (USI)
*
* This file is part of URingPaxos.
*
* URingPaxos 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 3 of the License, or
* (at your option) any later version.
*
* URingPaxos 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 URingPaxos. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* Name: NoStorage<br>
* Description: <br>
*
* Creation date: Feb 7, 2013<br>
* $Id$
*
* @author Samuel Benz benz@geoid.ch
*/
public class NoStorage implements StableStorage {
//private final static Logger logger = Logger.getLogger(NoStorage.class);
private final Map<Long, Integer> promised = new LinkedHashMap<Long,Integer>(10000,0.75F,false){
private static final long serialVersionUID = -2704400128020327063L;
protected boolean removeEldestEntry(Map.Entry<Long, Integer> eldest) {
return size() > 15000; // hold only 15'000 values in memory !
}};
private long last_trimmed_instance = 0;
@Override
public void putBallot(Long instance, int ballot) {
promised.put(instance, ballot);
}
@Override
public int getBallot(Long instance) {
return promised.get(instance);
}
@Override
public synchronized boolean containsBallot(Long instance) {
return promised.containsKey(instance);
}
@Override
public void putDecision(Long instance, Decision decision) {
/*if(logger.isDebugEnabled()){
logger.debug("add " + decision + " to stable storage");
}*/
}
@Override
public Decision getDecision(Long instance) {
return null;
}
@Override
public boolean containsDecision(Long instance) {
/*if(logger.isDebugEnabled()){
logger.debug("check if " + instance + " exists in stable storage");
}*/
return false;
}
@Override
public boolean trim(Long instance) {
last_trimmed_instance = instance;
return true;
}
@Override
public Long getLastTrimInstance() {
return last_trimmed_instance;
}
@Override
public void close(){
}
}