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/*
* Copyright (c) 1998, 2018 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0,
* or the Eclipse Distribution License v. 1.0 which is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
*/
// Contributors:
// Oracle - initial API and implementation from Oracle TopLink
package org.eclipse.persistence.annotations;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;
import org.eclipse.persistence.config.CacheIsolationType;
import static org.eclipse.persistence.config.CacheIsolationType.SHARED;
import static java.lang.annotation.ElementType.TYPE;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
import static org.eclipse.persistence.annotations.CacheType.SOFT_WEAK;
import static org.eclipse.persistence.annotations.CacheCoordinationType.SEND_OBJECT_CHANGES;
/**
* The Cache annotation is used to configure the EclipseLink object cache.
* By default EclipseLink uses a shared object cache to cache all objects.
* The caching type and options can be configured on a per class basis to allow
* optimal caching.
* <p>
* This includes options for configuring the type of caching,
* setting the size, disabling the shared cache, expiring objects, refreshing,
* and cache coordination (clustering).
* <p>
* A Cache annotation may be defined on an Entity or MappedSuperclass. In the
* case of inheritance, a Cache annotation should only be defined on the root
* of the inheritance hierarchy.
*
* @see org.eclipse.persistence.annotations.CacheType
* @see org.eclipse.persistence.annotations.CacheCoordinationType
*
* @see org.eclipse.persistence.descriptors.ClassDescriptor
* @see org.eclipse.persistence.descriptors.invalidation.CacheInvalidationPolicy
*
* @author Guy Pelletier
* @since Oracle TopLink 11.1.1.0.0
*/
@Target({TYPE})
@Retention(RUNTIME)
public @interface Cache {
/**
* (Optional) The type of cache to use.
* The default is SOFT_WEAK.
*/
CacheType type() default SOFT_WEAK;
/**
* (Optional) The size of cache to use.
* The default is 100.
*/
int size() default 100;
/**
* (Optional) Cached instances in the shared cache,
* or only a per EntityManager isolated cache.
* The default is shared.
* @deprecated As of Eclipselink 2.2. See the attribute 'isolation'
*/
@Deprecated
boolean shared() default true;
/**
* (Optional) Controls the level of caching this Entity will use.
* The default is CacheIsolationType.SHARED which has EclipseLink
* Caching all Entities in the Shared Cache.
* @see org.eclipse.persistence.config.CacheIsolationType
*/
CacheIsolationType isolation() default SHARED;
/**
* (Optional) Expire cached instance after a fix period of time (ms).
* Queries executed against the cache after this will be forced back
* to the database for a refreshed copy.
* By default there is no expiry.
*/
int expiry() default -1; // minus one is no expiry.
/**
* (Optional) Expire cached instance a specific time of day. Queries
* executed against the cache after this will be forced back to the
* database for a refreshed copy.
*/
TimeOfDay expiryTimeOfDay() default @TimeOfDay(specified=false);
/**
* (Optional) Force all queries that go to the database to always
* refresh the cache.
* Default is false.
* Consider disabling the shared cache instead of forcing refreshing.
*/
boolean alwaysRefresh() default false;
/**
* (Optional) For all queries that go to the database, refresh the cache
* only if the data received from the database by a query is newer than
* the data in the cache (as determined by the optimistic locking field).
* This is normally used in conjunction with alwaysRefresh, and by itself
* it only affect explicit refresh calls or queries.
* Default is false.
*/
boolean refreshOnlyIfNewer() default false;
/**
* (Optional) Setting to true will force all queries to bypass the
* cache for hits but still resolve against the cache for identity.
* This forces all queries to hit the database.
*/
boolean disableHits() default false;
/**
* (Optional) The cache coordination mode.
* Note that cache coordination must also be configured for the persistence unit/session.
*/
CacheCoordinationType coordinationType() default SEND_OBJECT_CHANGES;
/**
* (Optional) The database change notification mode.
* Note that database event listener must also be configured for the persistence unit/session.
*/
DatabaseChangeNotificationType databaseChangeNotificationType() default DatabaseChangeNotificationType.INVALIDATE;
}
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