| // Copyright 2007, 2008 The Apache Software Foundation |
| // |
| // 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 org.apache.tapestry5.services; |
| |
| /** |
| * Used by {@link ApplicationStateManager} to manage a specific kind of ASO persistence. The stategy is responsible for |
| * managing ASO instances within its domain. |
| * |
| * @see org.apache.tapestry5.services.ApplicationStatePersistenceStrategySource |
| */ |
| public interface ApplicationStatePersistenceStrategy |
| { |
| /** |
| * Gets the ASO from the domain. If the ASO does not already exist, it is created and stored, then returned. |
| */ |
| <T> T get(Class<T> asoClass, ApplicationStateCreator<T> creator); |
| |
| /** |
| * Stores a new ASO, possibly replacing the existing one. |
| * |
| * @param <T> |
| * @param asoClass |
| * @param aso instance to store, or null to delete existing |
| */ |
| <T> void set(Class<T> asoClass, T aso); |
| |
| /** |
| * Returns true if the ASO already exists, false if null. |
| */ |
| <T> boolean exists(Class<T> asoClass); |
| } |