org.cache2k.expiry.ValueWithExpiryTime Maven / Gradle / Ivy
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package org.cache2k.expiry;
/*
* #%L
* cache2k API
* %%
* Copyright (C) 2000 - 2020 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%
*/
import org.cache2k.Cache2kBuilder;
import java.util.concurrent.TimeUnit;
/**
* Interface to add to a value object if it is possible to derive the
* expiry time from the value. If no explicit expiry calculator is set
* and this interface is detected on the value, the expiry requested
* from the value by the cache.
*
* Important caveat: This interface must be present on the configured cache value type to enable
* the functionality.
*
* @author Jens Wilke
*/
public interface ValueWithExpiryTime {
/**
* Point in time in milliseconds when the value should expire.
*
* @return time the time of expiry in millis since epoch. {@link ExpiryPolicy#NO_CACHE} if it
* should not cached. {@link ExpiryPolicy#ETERNAL} if there is no specific expiry time
* known or needed.
* The effective expiry duration will never be longer than the
* configured expiry value via
* {@link Cache2kBuilder#expireAfterWrite(long, TimeUnit)} (long, TimeUnit)}.
* If a negative value is returned, the negated value will be the expiry time
* used, but sharp expiry is requested always,
* ignoring {@link Cache2kBuilder#sharpExpiry(boolean)}.
*/
long getCacheExpiryTime();
}