// Copyright 2011 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.assets;
import org.apache.tapestry5.SymbolConstants;
import org.apache.tapestry5.internal.event.InvalidationEventHubImpl;
import org.apache.tapestry5.ioc.Resource;
import org.apache.tapestry5.ioc.annotations.PostInjection;
import org.apache.tapestry5.ioc.annotations.Symbol;
import org.apache.tapestry5.ioc.internal.util.URLChangeTracker;
import org.apache.tapestry5.ioc.services.ClasspathURLConverter;
import org.apache.tapestry5.services.UpdateListener;
import org.apache.tapestry5.services.UpdateListenerHub;
public class ResourceChangeTrackerImpl extends InvalidationEventHubImpl implements ResourceChangeTracker,
UpdateListener
{
private final URLChangeTracker tracker;
public ResourceChangeTrackerImpl(ClasspathURLConverter classpathURLConverter,
@Symbol(SymbolConstants.PRODUCTION_MODE)
boolean productionMode)
{
super(productionMode);
// Use granularity of seconds (not milliseconds) since that works properly
// with response headers for identifying last modified. Don't track
// folder changes, just changes to actual files.
tracker = new URLChangeTracker(classpathURLConverter, true, false);
}
@PostInjection
public void registerWithUpdateListenerHub(UpdateListenerHub hub)
{
hub.addUpdateListener(this);
}
public long trackResource(Resource resource)
{
return tracker.add(resource.toURL());
}
public void checkForUpdates()
{
if (tracker.containsChanges())
{
fireInvalidationEvent();
tracker.clear();
}
}
}