org.apache.tapestry5.internal.services

## Interface ComponentTemplateSource

- All Known Implementing Classes:
    ComponentTemplateSourceImpl

      public interface ComponentTemplateSource

  Provides access to cached `ComponentTemplate`s. 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 `missing template`.

- - ### Method Summary

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method and Description
    --- | ---
    `InvalidationEventHub` | `getInvalidationEventHub()` Event hub used to notify listeners that underlying component template files have changed.
    `ComponentTemplate` | `getTemplate(ComponentModel componentModel, ComponentResourceSelector selector)` Provides access to a template.

- - ### Method Detail

    - #### getTemplate

          ComponentTemplate getTemplate(ComponentModel componentModel,
                                        ComponentResourceSelector selector)

      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
        `selector` - defines locale and other information needed to locate template
      Returns:
        the cached template instance

    - #### getInvalidationEventHub

          InvalidationEventHub getInvalidationEventHub()

      Event hub used to notify listeners that underlying component template files have changed.
      Since:
        5.1.0.0
      See Also:
        `ComponentTemplates`

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