package org.jtheque.states; import org.jtheque.utils.annotations.ThreadSafe; /* * Copyright JTheque (Baptiste Wicht) * * 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. */ /** * A state manager. It seems a manager who's responsible for the persistence of the states. This class is * unconditionally thread safe. * * @author Baptiste Wicht */ @ThreadSafe public interface StateService { /** * Return the state of the given instance. The class must be annotated with @State and must contains and a @Load and * a @Save method. * * @param state The state to get. * @param <T> The type of state. * * @throws IllegalArgumentException If the class is not annotated with @State or doesn't contains an @Save and * an @Load method. * @throws NullPointerException If state is null. * * @return The loaded state. The instance is the same but the state has been initialized. */ <T> T getState(T state); }