/**
* Copyright 2011-2016 Terracotta, Inc.
* Copyright 2011-2016 Oracle America Incorporated
*
* 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.
*/
package javax.cache.expiry;
import javax.cache.configuration.
Factory;
import javax.cache.configuration.
FactoryBuilder;
import java.io.
Serializable;
import static javax.cache.expiry.
Duration.
ETERNAL;
/**
* An eternal {@link ExpiryPolicy} specifies that Cache Entries
* won't expire. This however doesn't mean they won't be evicted if an
* underlying implementation needs to free-up resources where by it may
* choose to evict entries that are not due to expire.
*
* @author Greg Luck
* @author Brian Oliver
* @since 1.0
* @see ExpiryPolicy
*/
public final class
EternalExpiryPolicy implements
ExpiryPolicy,
Serializable {
/**
* The serialVersionUID required for {@link java.io.Serializable}.
*/
public static final long
serialVersionUID = 201305101603L;
/**
* Obtains a {@link Factory} for an Eternal {@link ExpiryPolicy}.
* @return a {@link Factory} for an Eternal {@link ExpiryPolicy}.
*/
public static
Factory<
ExpiryPolicy>
factoryOf() {
return new
FactoryBuilder.
SingletonFactory<
ExpiryPolicy>(
new
EternalExpiryPolicy());
}
/**
* {@inheritDoc}
*/
@
Override
public
Duration getExpiryForCreation() {
return
ETERNAL;
}
/**
* {@inheritDoc}
*/
@
Override
public
Duration getExpiryForAccess() {
return null;
}
/**
* {@inheritDoc}
*/
@
Override
public
Duration getExpiryForUpdate() {
return null;
}
/**
* {@inheritDoc}
*/
@
Override
public int
hashCode() {
return
EternalExpiryPolicy.class.
hashCode();
}
/**
* {@inheritDoc}
*/
@
Override
public boolean
equals(
Object other) {
return
other instanceof
EternalExpiryPolicy;
}
}