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/**
* Copyright (c) 2004 - 2009 Eike Stepper (Berlin, Germany) and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Eike Stepper - initial API and implementation
*/
package org.eclipse.emf.cdo.common.revision.cache;
import org.eclipse.emf.cdo.internal.common.revision.cache.lru.LRURevisionCache;
import org.eclipse.emf.cdo.internal.common.revision.cache.mem.MEMRevisionCache;
import org.eclipse.emf.cdo.internal.common.revision.cache.two.TwoLevelRevisionCache;
/**
* @author Eike Stepper
* @since 2.0
*/
public final class CDORevisionCacheUtil
{
public static final int DEFAULT_CAPACITY_CURRENT = 1000;
public static final int DEFAULT_CAPACITY_REVISED = 1000;
private CDORevisionCacheUtil()
{
}
/**
* Creates and returns a new fixed size cache with two separate LRU (least-recently used) eviction policies for both
* current revision and revised revisions.
*/
public static CDORevisionCache createLRUCache(int capacityCurrent, int capacityRevised)
{
LRURevisionCache cache = new LRURevisionCache();
cache.setCapacityCurrent(capacityCurrent);
cache.setCapacityRevised(capacityRevised);
return cache;
}
/**
* Creates and returns a new memory sensitive cache.
*/
public static CDORevisionCache createMEMCache()
{
return new MEMRevisionCache();
}
/**
* Creates and returns a new two-level cache.
*/
public static CDORevisionCache createTwoLevelCache(CDORevisionCache level1, CDORevisionCache level2)
{
TwoLevelRevisionCache cache = new TwoLevelRevisionCache();
cache.setLevel1(level1);
cache.setLevel2(level2);
return cache;
}
/**
* Creates and returns a new two-level cache with the first level being an LRU cache and the second level being a
* memory sensitive cache.
*/
public static CDORevisionCache createDefaultCache(int capacityCurrent, int capacityRevised)
{
return createTwoLevelCache(createLRUCache(capacityCurrent, capacityRevised), createMEMCache());
}
/**
* Identical to calling
* <p>
* <code>{@link #createDefaultCache(int, int) createDefaultCache}({@link #DEFAULT_CAPACITY_CURRENT}, {@link #DEFAULT_CAPACITY_REVISED})</code>
*/
public static CDORevisionCache createDefaultCache()
{
return createDefaultCache(DEFAULT_CAPACITY_CURRENT, DEFAULT_CAPACITY_REVISED);
}
}
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