com.mchange.v1.cachedstore.ManualCleanupSoftKeyCachedStore Maven / Gradle / Ivy

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Enables C3P0 with Hibernate connections in the GuicedPersistence provider Requires JDK 8 and up

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/*
 * Distributed as part of mchange-commons-java 0.2.11
 *
 * Copyright (C) 2015 Machinery For Change, Inc.
 *
 * Author: Steve Waldman 
 *
 * This library is free software; you can redistribute it and/or modify
 * it under the terms of EITHER:
 *
 *     1) The GNU Lesser General Public License (LGPL), version 2.1, as 
 *        published by the Free Software Foundation
 *
 * OR
 *
 *     2) The Eclipse Public License (EPL), version 1.0
 *
 * You may choose which license to accept if you wish to redistribute
 * or modify this work. You may offer derivatives of this work
 * under the license you have chosen, or you may provide the same
 * choice of license which you have been offered here.
 *
 * This software 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.
 *
 * You should have received copies of both LGPL v2.1 and EPL v1.0
 * along with this software; see the files LICENSE-EPL and LICENSE-LGPL.
 * If not, the text of these licenses are currently available at
 *
 * LGPL v2.1: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
 *  EPL v1.0: http://www.eclipse.org/org/documents/epl-v10.php 
 * 
 */

package com.mchange.v1.cachedstore;

import java.lang.ref.ReferenceQueue;

class ManualCleanupSoftKeyCachedStore extends KeyTransformingCachedStore implements Vacuumable
{
    ReferenceQueue queue = new ReferenceQueue();

    public ManualCleanupSoftKeyCachedStore(CachedStore.Manager manager)
    { super( manager ); }

    protected Object toUserKey( Object cachePutKey )
    { return ((SoftKey) cachePutKey).get(); }

    protected Object toCacheFetchKey( Object userKey )
    { return new SoftKey( userKey, null ); }

    protected Object toCachePutKey( Object userKey )
    { return new SoftKey( userKey, queue ); }

    public void vacuum() throws CachedStoreException
    { 
	SoftKey key;
	while ((key = (SoftKey) queue.poll()) != null)
	    {
		//System.err.println("Vacuuming Key ---> " + key);
		this.removeByTransformedKey( key );
	    }
    }
}