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Central module for Tapestry, containing interfaces to the Java
Servlet API and all core services and components.
// 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 Session State Object (SSO) persistence. The
* stategy is responsible for managing SSO instances within its domain.
*
* @see org.apache.tapestry5.services.ApplicationStatePersistenceStrategySource
*/
public interface ApplicationStatePersistenceStrategy
{
/**
* Gets the SSO from the domain. If the ASO does not already exist, it is created and stored, then returned.
*/
T get(Class ssoClass, ApplicationStateCreator creator);
/**
* Stores a new SSO, possibly replacing the existing one.
*
* @param
* @param ssoClass
* @param sso instance to store, or null to delete existing
*/
void set(Class ssoClass, T sso);
/**
* Returns true if the SSO already exists, false if null.
*/
boolean exists(Class ssoClass);
}