    001// Licensed to the Apache Software Foundation (ASF) under one
    002// or more contributor license agreements.  See the NOTICE file
    003// distributed with this work for additional information
    004// regarding copyright ownership.  The ASF licenses this file
    005// to you under the Apache License, Version 2.0 (the
    006// "License"); you may not use this file except in compliance
    007// with the License.  You may obtain a copy of the License at
    008//
    009// http://www.apache.org/licenses/LICENSE-2.0
    010//
    011// Unless required by applicable law or agreed to in writing,
    012// software distributed under the License is distributed on an
    013// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    014// KIND, either express or implied.  See the License for the
    015// specific language governing permissions and limitations
    016// under the License.
    017
    018package org.apache.tapestry5.services;
    019
    020/**
    021 * Used by {@link ApplicationStateManager} and {@link ApplicationStatePersistenceStrategy} to create
    022 * a Session State Object (SSO) on demand.
    023 * <p>
    024 * <em>NOTE: The term "Application" here is a hold-over from Tapestry 5.0, which used
    025 * the @ApplicationState (deprecated and deleted) annotation, and called them "ASOs"
    026 * (Application State Objects). This service would be better named "SessionStateCreator"
    027 * (but renaming it would cause backwards compatibility issues).</em>
    028 *
    029 * @param <T> the type of the created objects
    030 */
    031public interface ApplicationStateCreator<T>
    032{
    033    /**
    034     * Create a new instance of a session state object.
    035     */
    036    T create();
    037}