InvalidationEventHub (Tapestry API - 5.7.0)

All Known Subinterfaces:

InternalComponentInvalidationEventHub, MessagesSource, ResourceChangeTracker, ResourceDigestManager

All Known Implementing Classes:

ComponentTemplateSourceImpl, InternalComponentInvalidationEventHubImpl, InvalidationEventHubImpl, MessagesSourceImpl, ResourceChangeTrackerImpl, ResourceDigestManagerImpl
```
public interface InvalidationEventHub
```
An object which manages a list of InvalidationListeners. There are multiple event hub services implementing this interface, each with a specific marker annotation; each can register listeners and fire events; these are based on the type of resource that has been invalidated. Tapestry has built-in support for:

message catalog resources
ComponentMessages marker annotation
component templates
ComponentTemplates marker annotation
component classes
ComponentClasses marker annotation
Starting in Tapestry 5.3, these services are disabled in production (it does nothing).

Since:

5.1.0.0

Method Summary

All Methods Instance Methods Abstract Methods Deprecated Methods
Modifier and Type	Method	Description
`void`	`addInvalidationCallback(Runnable callback)`	Adds a callback that is invoked when an underlying tracked resource has changed.
`void`	`addInvalidationListener(InvalidationListener listener)`	Deprecated. in 5.4, use `addInvalidationCallback(Runnable)` instead}
`void`	`clearOnInvalidation(Map<?,?> map)`	Adds a callback that clears the map.

- Method Detail
  - addInvalidationListener
```
void addInvalidationListener(InvalidationListener listener)
```
    Deprecated.
    in 5.4, use addInvalidationCallback(Runnable) instead}
    
    Adds a listener, who needs to know when an underlying resource of a given category has changed (so that the receiver may discard any cached data that may have been invalidated). Does nothing in production mode.
  - addInvalidationCallback
```
void addInvalidationCallback(Runnable callback)
```
    Adds a callback that is invoked when an underlying tracked resource has changed. Does nothing in production mode.
    
    Since:
    
    5.4
  - clearOnInvalidation
```
void clearOnInvalidation(Map<?,?> map)
```
    Adds a callback that clears the map.
    
    Since:
    
    5.4