package org.cache2k.benchmark.impl2015;
/*
* #%L
* Benchmarks: implementation variants
* %%
* Copyright (C) 2013 - 2017 headissue GmbH, Munich
* %%
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* #L%
*/
/**
* Object representing a cache entry. With the cache entry it can be
* checked whether a mapping in the cache is present, even if the cache
* holds null or an exception.
*
* <p>After retrieved the entry instance does not change the values, even
* if the value for its key is updated in the cache.
*
* <p>Design remark: The cache is generally also aware of the time the
* object will be refreshed next or when it expired. This is not exposed
* to applications by intention.
*
* @author Jens Wilke; created: 2014-03-18
*/
public interface CacheEntry<K, T> {
K getKey();
T getValue();
Throwable getException();
/**
* Time the entry was last updated either by a fetch via the CacheSource
* or by a put. If the entry was never fetched 0 is returned.
*/
long getLastModification();
}