// Copyright 2006, 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.internal.services;
import org.apache.tapestry5.internal.structure.Page;
import org.apache.tapestry5.ioc.internal.util.CollectionFactory;
import org.apache.tapestry5.ioc.internal.util.Defense;
import org.apache.tapestry5.ioc.services.ThreadCleanupListener;
import org.apache.tapestry5.services.ComponentClassResolver;
import java.util.Map;
public class RequestPageCacheImpl implements RequestPageCache, ThreadCleanupListener
{
private final PagePool pagePool;
private final ComponentClassResolver resolver;
/**
* Keyed on canonical page name (case insensitive).
*/
private final Map<String, Page> cache = CollectionFactory.newCaseInsensitiveMap();
public RequestPageCacheImpl(PagePool pagePool, ComponentClassResolver resolver)
{
this.pagePool = pagePool;
this.resolver = resolver;
}
public Page get(String logicalPageName)
{
Defense.notNull(logicalPageName, "logicalPageName");
String canonicalName = resolver.canonicalizePageName(logicalPageName);
Page page = cache.get(canonicalName);
if (page == null)
{
page = pagePool.checkout(canonicalName);
try
{
page.attached();
}
catch (RuntimeException ex)
{
pagePool.discard(page);
throw ex;
}
cache.put(canonicalName, page);
}
return page;
}
/**
* At the end of the request, when the thread cleanup event occurs, release any pages attached to the request back
* to the page pool.
*/
public void threadDidCleanup()
{
for (Page p : cache.values())
pagePool.release(p);
}
}