com.mchange.v1.cachedstore.CachedStoreFactory Maven / Gradle / Ivy
/*
* Distributed as part of mchange-commons-java 0.2.9
*
* 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.reflect.Method;
import java.lang.reflect.Proxy;
import java.lang.reflect.InvocationHandler;
/**
* Unless otherwise noted, implementations are to be presumed
* NOT thread safe!!! use the synchronized
* wrappers defined in CachedStoreUtils for multithreaded situations!
*
* @see CachedStoreUtils#synchronizedCachedStore
* @see CachedStoreUtils#synchronizedTweakableCachedStore
*/
public final class CachedStoreFactory
{
public static TweakableCachedStore createNoCleanupCachedStore(CachedStore.Manager manager)
{ return new NoCleanupCachedStore( manager ); }
/**
* Better to use createSynchronousCleanupSoftKeyCachedStore to prevent the build of
* cleaned SoftReferences, unless the universe of potential cacheables is small.
*/
public static TweakableCachedStore createSoftValueCachedStore(CachedStore.Manager manager)
{ return new SoftReferenceCachedStore( manager ); }
public static TweakableCachedStore createSynchronousCleanupSoftKeyCachedStore(CachedStore.Manager manager)
{
final ManualCleanupSoftKeyCachedStore inner = new ManualCleanupSoftKeyCachedStore( manager );
InvocationHandler handler = new InvocationHandler()
{
public Object invoke(Object proxy, Method m, Object[] args)
throws Throwable
{
inner.vacuum();
return m.invoke( inner, args );
}
};
return (TweakableCachedStore) Proxy.newProxyInstance( CachedStoreFactory.class.getClassLoader(),
new Class[] { TweakableCachedStore.class },
handler );
}
/**
* Always reads directly from manager, as if values are always dirty.
*/
public static TweakableCachedStore createNoCacheCachedStore( CachedStore.Manager mgr )
{ return new NoCacheCachedStore( mgr ); }
/**
* creates a WritableCachedStore implementation that uses soft keys and synchronous
* cleanup for its read cache.
*/
public static WritableCachedStore createDefaultWritableCachedStore(WritableCachedStore.Manager manager)
{
TweakableCachedStore readOnlyCache = createSynchronousCleanupSoftKeyCachedStore( manager );
return new SimpleWritableCachedStore( readOnlyCache, manager );
}
public static WritableCachedStore cacheWritesOnlyWritableCachedStore( WritableCachedStore.Manager mgr )
{
TweakableCachedStore readOnlyCache = createNoCacheCachedStore( mgr );
return new SimpleWritableCachedStore( readOnlyCache, mgr );
}
/**
* Always reads directly from manager, as if values are always dirty. Always
* writes to back-end storage. Effectively Autoflushing, since every write
* is flushed.
*
* @see Autoflushing
*/
public static WritableCachedStore createNoCacheWritableCachedStore( WritableCachedStore.Manager mgr )
{ return new NoCacheWritableCachedStore( mgr ); }
}