| /* |
| * 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. |
| */ |
| package org.apache.openjpa.datacache; |
| |
| import org.apache.openjpa.kernel.OpenJPAStateManager; |
| import org.apache.openjpa.lib.conf.Configurable; |
| |
| /** |
| * A policy determines whether a given entity should be cached and if true, in which named partition of the |
| * cache. |
| * <br> |
| * This policy is activated for each instance if and only if the cache settings specified in metadata |
| * such as JPA specification defined {@link Cacheable @Cacheable} annotation or OpenJPA specific |
| * {@link org.apache.openjpa.persistence.DataCache @DataCache} annotation or configuration property |
| * such as <code>javax.persistence.sharedCache.mode</code> determined the type of the instance being cachable. |
| * <br> |
| * For example, a specific policy will never be active for when <code>javax.persistence.sharedCache.mode</code> |
| * is set to <code>NONE</code>. |
| * <br> |
| * Distribution Policies are configurable. So a specific policy can be configured as |
| * <pre> |
| * <property name="openjpa.CacheDistributionPolicy" value="com.acme.FooPolicy(param1='xyz',param2=true)"/> |
| * </pre> |
| * where <code>com.acme.FooPolicy</code> is an implementation of this interface and defines bean style setter and |
| * getter methods for String property <code>param1</code> and boolean property <code>param2</code>. |
| * |
| * @author Pinaki Poddar |
| * |
| * @since 2.0.0 |
| * |
| */ |
| public interface CacheDistributionPolicy extends Configurable { |
| /** |
| * Selects the name of the cache where the given managed proxy object state be cached. |
| * |
| * @param sm the managed proxy object to be cached. The actual managed instance can be accessed from the proxy |
| * instance simply as <code>sm.getManagedInstance()</code>. |
| * |
| * @param context the context of invocation. No specific semantics is attributed currently. Can be null. |
| * |
| * @return name of the cache or null, implying that that the instance should not be cached. |
| */ |
| String selectCache(OpenJPAStateManager sm, Object context); |
| } |