com.mchange.v1.cachedstore.NoCleanupCachedStore Maven / Gradle / Ivy
/*
* 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.util.HashMap;
import java.util.Map;
import java.util.Iterator;
class NoCleanupCachedStore implements TweakableCachedStore
{
final static boolean DEBUG = true;
protected Map cache = new HashMap();
CachedStore.Manager manager;
public NoCleanupCachedStore(CachedStore.Manager manager)
{ this.manager = manager; }
// be careful if you modify this! subclasses depend upon this
// exact implementation when overriding methods for key / value
// transformations!
public Object find(Object key) throws CachedStoreException
{
try
{
Object out = getCachedValue( key );
if (out == null || manager.isDirty(key, out))
{
out = manager.recreateFromKey(key);
if (out != null)
setCachedValue(key, out);
}
return out;
}
catch (CachedStoreException e)
{ throw e; }
catch (Exception e)
{
if (DEBUG)
e.printStackTrace();
throw new CachedStoreException(e);
}
}
//overridden by subclasses!
public Object getCachedValue(Object key)
{ return cache.get( key ); }
//overridden by subclasses!
public void removeFromCache(Object key)
throws CachedStoreException
{ cache.remove( key ); }
//overridden by subclasses!
public void setCachedValue(Object key, Object value)
throws CachedStoreException
{ cache.put(key, value); }
//overridden by subclasses!
public Iterator cachedKeys() throws CachedStoreException
{ return cache.keySet().iterator(); }
public void reset()
{ cache.clear(); }
}