/*
* Copyright 2005 Joe Walker
*
* 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.directwebremoting.datasync;
import org.directwebremoting.ScriptSession;
import org.directwebremoting.WebContextFactory;
/**
* A StoreProvider that allows us to have a number of StoreProviders for each
* {@link ScriptSession}. New {@link StoreProvider}s are created by a
* {@link StoreProviderFactory} and stored in the ScriptSession under a given
* attribute name.
* @author Joe Walker [joe at getahead dot ltd dot uk]
*/
public class PerScriptSessionStoreProvider<T> extends AbstractPerXStoreProvider<T>
{
public PerScriptSessionStoreProvider(StoreProviderFactory<T, ScriptSession> factory, String attributeName)
{
this.factory = factory;
this.attributeName = attributeName;
}
/**
* Internal method to find or create a StoreProvider for a given user.
*/
@Override
protected StoreProvider<T> getStoreProvider()
{
ScriptSession session = WebContextFactory.get().getScriptSession();
@SuppressWarnings("unchecked")
StoreProvider<T> storeProvider = (StoreProvider<T>) session.getAttribute(attributeName);
if (storeProvider == null)
{
storeProvider = factory.create(session);
session.setAttribute(attributeName, storeProvider);
}
return storeProvider;
}
/**
* The attribute name that we are storing created StoreProviders under in
* the ScriptSession
*/
private final String attributeName;
/**
* The factory to enable us to create factories per ScriptSession
*/
private final StoreProviderFactory<T, ScriptSession> factory;
}