001package org.cache2k;
002
003/*
004 * #%L
005 * cache2k api only package
006 * %%
007 * Copyright (C) 2000 - 2014 headissue GmbH, Munich
008 * %%
009 * This program is free software: you can redistribute it and/or modify
010 * it under the terms of the GNU General Public License as
011 * published by the Free Software Foundation, either version 3 of the 
012 * License, or (at your option) any later version.
013 * 
014 * This program is distributed in the hope that it will be useful,
015 * but WITHOUT ANY WARRANTY; without even the implied warranty of
016 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
017 * GNU General Public License for more details.
018 * 
019 * You should have received a copy of the GNU General Public 
020 * License along with this program.  If not, see
021 * <http://www.gnu.org/licenses/gpl-3.0.html>.
022 * #L%
023 */
024
025import javax.annotation.Nonnull;
026import javax.annotation.Nullable;
027
028/**
029 * Fetch time of next refresh from the value object itself. The value object
030 * needs to implement {@link ValueWithNextRefreshTime}.
031 *
032 * @author Jens Wilke; created: 2013-05-02
033 * @see ValueWithNextRefreshTime
034 */
035public final class EntryRefreshController<T> implements RefreshController<T> {
036
037  public static final EntryRefreshController INSTANCE = new EntryRefreshController();
038
039  @Override
040  public long calculateNextRefreshTime(
041    @Nullable T _oldObject,
042    @Nonnull T _newObject,
043    long _timeOfLastRefresh, long now) {
044    return ((ValueWithNextRefreshTime) _newObject).getNextRefreshTime();
045  }
046
047}