| /* |
| * Copyright (c) 2007, 2011, 2012, 2015 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.net4j.util.cache; |
| |
| import org.eclipse.net4j.util.event.INotifier; |
| |
| /** |
| * @author Eike Stepper |
| */ |
| public interface ICacheMonitor extends INotifier |
| { |
| public ConditionPolicy getConditionPolicy(); |
| |
| public Condition getCondition(); |
| |
| public ICacheProbe registerCache(ICache cache); |
| |
| public void deregisterCache(ICache cache); |
| |
| /** |
| * @author Eike Stepper |
| */ |
| public enum Condition |
| { |
| /** |
| * Condition <b>GREEN</b> indicates that the system is operating normally and enough free memory is available so |
| * that caches are free to cache additional elements. |
| */ |
| GREEN, |
| |
| /** |
| * Condition <b>YELLOW</b> indicates that the system is operating normally but free memory is about to go low so |
| * that caches should stop to cache additional elements. |
| */ |
| YELLOW, |
| |
| /** |
| * Condition <b>RED</b> indicates that the system state is critical and free memory is almost exhausted so that |
| * caches must immediately stop to cache additional elements. Depending of the eviction strategy element eviction is |
| * ordered. |
| */ |
| RED; |
| } |
| |
| /** |
| * @author Eike Stepper |
| */ |
| public interface ConditionPolicy |
| { |
| public Condition getNewCondition(Condition oldCondition); |
| } |
| } |