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The Java Data Objects API (JDO) : a standard interface-based Java model abstraction of persistence, developed by the JCP.
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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 */

/*
 * DataStoreCache.java
 *
 */
package javax.jdo.datastore;

import java.util.Collection;

/** 
 * Many JDO implementations allow instances to be cached in a
 * second-level cache, and allow direct management of the cache by
 * knowledgeable applications. This interface standardizes this behavior.
 * @since 2.0
 * @version 2.0
 */
public interface DataStoreCache {

    /** Evict the parameter instance from the second-level cache.
     * @param oid the object id of the instance to evict.
     * @since 2.0
     */
    void evict (Object oid);

    /** Evict the parameter instances from the second-level cache.
     * All instances in the PersistenceManager's cache are evicted 
     * from the second-level cache.
     * @since 2.0
     */
    void evictAll ();

    /** Evict the parameter instances from the second-level cache.
     * @param oids the object ids of the instance to evict.
     * @since 2.0
     */
    void evictAll (Object... oids);

    /** Evict the parameter instances from the second-level cache.
     * @param oids the object ids of the instance to evict.
     * @since 2.0
     */
    void evictAll (Collection oids);

    /** Evict the parameter instances from the second-level cache.
     * @param pcClass the class of instances to evict
     * @param subclasses if true, evict instances of subclasses also
     * @since 2.1
     */
    void evictAll (boolean subclasses, Class pcClass);

    /** Pin the parameter instance in the second-level cache.
     * @param oid the object id of the instance to pin.
     * @since 2.0
     */
    void pin (Object oid);

    /** Pin the parameter instances in the second-level cache.
     * @param oids the object ids of the instances to pin.
     * @since 2.0
     */
    void pinAll (Collection oids);

    /** Pin the parameter instances in the second-level cache.
     * @param oids the object ids of the instances to pin.
     * @since 2.0
     */
    void pinAll (Object... oids);

    /** Pin instances in the second-level cache.
     * @param pcClass the class of instances to pin
     * @param subclasses if true, pin instances of subclasses also
     * @since 2.1
     */
    void pinAll (boolean subclasses, Class pcClass);

    /** Unpin the parameter instance from the second-level cache.
     * @param oid the object id of the instance to unpin.
     * @since 2.0
     */
    void unpin(Object oid);

    /** Unpin the parameter instances from the second-level cache.
     * @param oids the object ids of the instance to evict.
     * @since 2.0
     */
    void unpinAll(Collection oids);

    /** Unpin the parameter instance from the second-level cache.
     * @param oids the object id of the instance to evict.
     * @since 2.0
     */
    void unpinAll(Object... oids);
    
    /** Unpin instances from the second-level cache.
     * @param pcClass the class of instances to unpin
     * @param subclasses if true, unpin instances of subclasses also
     * @since 2.1
     */
    void unpinAll(boolean subclasses, Class pcClass);
    
    /** 
     * This class is an empty implementation of the DataStoreCache 
     * interface. It can be used by an implementation that does not
     * support a second-level cache.
     * @since 2.0
     */
    public class EmptyDataStoreCache implements DataStoreCache {
        
        public EmptyDataStoreCache() {
        }
        
        public void evict(Object oid) {
        }

        public void evictAll() {
        }

        public void evictAll(Object... oids) {
        }

        public void evictAll(Collection oids) {
        }

        public void evictAll(boolean subclasses, Class pcClass) {
        }

        public void pin(Object oid) {
        }

        public void pinAll(Object... oids) {
        }

        public void pinAll(Collection oids) {
        }

        public void pinAll(boolean subclasses, Class pcClass) {
        }

        public void unpin(Object oid) {
        }

        public void unpinAll(Object... oids) {
        }

        public void unpinAll(Collection oids) {
        }

        public void unpinAll(boolean subclasses, Class pcClass) {
        }
    }
}