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 // 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
 // Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.

Used by ApplicationStateManager to manage a specific kind of Session State Object (SSO) persistence. The stategy is responsible for managing SSO instances within its domain.

Gets the SSO from the domain. If the ASO does not already exist, it is created and stored, then returned.
    <T> T get(Class<T> ssoClassApplicationStateCreator<T> creator);

Stores a new SSO, possibly replacing the existing one.

sso instance to store, or null to delete existing
    <T> void set(Class<T> ssoClass, T sso);

Returns true if the SSO already exists, false if null.
    <T> boolean exists(Class<T> ssoClass);
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