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 // Copyright 2006, 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;
Provides access to cached org.apache.tapestry5.internal.parser.ComponentTemplates. The source acts as a invalidation event hub, and will broadcast invalidation events when any loaded template resource changes. The listener for these invalidation events is the page source, which stores cached page instances.

Any search for a template will end with success (a non-null template), but the template returned may be the org.apache.tapestry5.internal.parser.ComponentTemplate.isMissing().

public interface ComponentTemplateSource
{
    
Provides access to a template. The template will be parsed as necessary. If no template for the exact component is found, then the template for the component's parent is returned. In this way, it is possible for a component to extend the behavior of its super-class without duplicating the super-class component's template.

In some cases, the empty template will be returned.

Parameters:
componentModel model for the component whose template is to be accessed
locale the locale to find the template within
Returns:
the cached template instance
    ComponentTemplate getTemplate(ComponentModel componentModelLocale locale);

    
Event hub used to notify listeners that underlying component template files have changed.

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