tapestry/tapestry-framework/src/java/org/apache/tapestry/engine/state/StateObjectPersistenceManager.java

// Copyright 2005 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.tapestry.engine.state;

/**
 * Interface for the nuts and bolts of getting and storing application state
 * objects. These are intended to be stateless, and manage a number of state
 * objects, mapping objectNames to internal storage in some way.
 * 
 * @author Howard M. Lewis Ship
 * @since 4.0
 */
public interface StateObjectPersistenceManager
{

    boolean exists(String objectName);

    Object get(String objectName, StateObjectFactory factory);

    void store(String objectName, Object stateObject);
}