Package org.apache.tapestry5.internal.services.assets

Interface ResourceChangeTracker

All Superinterfaces:

InvalidationEventHub, ResourceDependencies

All Known Implementing Classes:

ResourceChangeTrackerImpl

public interface ResourceChangeTracker
extends InvalidationEventHub, ResourceDependencies

Tracks resources (at least, resources that can change because they are on the file system) and acts as an UpdateListener to check for changes and notify its listeners.

Since:

5.3

Method Summary

Modifier and Type	Method	Description
void	forceInvalidationEvent()	Forces an invalidation event.
long	trackResource(Resource resource)	Start tracking the resource (or return the last modified time of an already tracked resource).

Methods inherited from interface org.apache.tapestry5.commons.services.InvalidationEventHub

addInvalidationCallback, addInvalidationListener, clearOnInvalidation

Methods inherited from interface org.apache.tapestry5.services.assets.ResourceDependencies

addDependency

Method Detail

trackResource

long trackResource(Resource resource)

Start tracking the resource (or return the last modified time of an already tracked resource). Only file system resources are tracked. Resources are tracked until any resource changes, at which points listeners are notified and the internal state is cleared.

Parameters:

resource - to track

Returns:

last modified time, to nearest second

See Also:

URLChangeTracker

forceInvalidationEvent

void forceInvalidationEvent()

Forces an invalidation event. This is required in a rare case, to clear out a StreamableResource generated from the component message catalog; there are some walls in place that prevent the message catalog's underlying Resources from being exposed.

Since:

5.4

See Also:

MessageCatalogResource