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Neo4j kernel is a lightweight, embedded Java database designed to store data structured as graphs rather than tables. For more information, see http://neo4j.org.

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/**
 * Copyright (c) 2002-2013 "Neo Technology,"
 * Network Engine for Objects in Lund AB [http://neotechnology.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j 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.
 *
 * 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, see .
 */
package org.neo4j.kernel.impl.cache;

import java.util.Collection;
import java.util.List;
import java.util.concurrent.ConcurrentHashMap;

public class StrongReferenceCache implements Cache
{
    private final String name;
    private final ConcurrentHashMap cache = new ConcurrentHashMap();

    private final HitCounter counter = new HitCounter();


    public StrongReferenceCache( String name )
    {
        this.name = name;
    }

    public void clear()
    {
        cache.clear();
    }

    public E get( long key )
    {
        return counter.count( cache.get( key ) );
    }

    public String getName()
    {
        return name;
    }

    public int maxSize()
    {
        return Integer.MAX_VALUE;
    }

    public void put( E value )
    {
        cache.put( value.getId(), value );
    }

    public void putAll( List list )
    {
        for ( E entity : list )
        {
            cache.put( entity.getId(), entity );
        }
    }

    public E remove( long key )
    {
        return cache.remove( key );
    }

    @Override
    public long hitCount()
    {
        return counter.getHitsCount();
    }

    @Override
    public long missCount()
    {
        return counter.getMissCount();
    }

    public long size()
    {
        return cache.size();
    }

    @Override
    public void putAll( Collection values )
    {
        for ( E entity : values )
        {
            cache.put( entity.getId(), entity );
        }
    }

    @Override
    public void updateSize( E entity, int newSize )
    {
        // do nothing
    }
    
    @Override
    public void printStatistics()
    {
        // do nothing
    }
}