| Interface | Description | 
|---|---|
| ActivitiesList | A list of Activities with useful methods to filter it or transform it. | 
| Activity | Representation of an Activity. | 
| ActivityLinkBuilder | An  ActivityLinkBuilderis used to compute the different links and URLs (for a document, an user, ...) that
 can be in an Activity message. | 
| ActivityStreamFilter | Filter called by the  ActivityStreamServiceto store and filter activities for specific use cases. | 
| ActivityStreamService | Service storing and querying activities. | 
| ActivityUpgrader | Helper to do upgrades on the existing Activities if needed. | 
| Class | Description | 
|---|---|
| AbstractActivityPageProvider<T> | Basic PageProvider used to handle list of Activities. | 
| AbstractActivityUpgrader | Abstract class for all  ActivityUpgraders. | 
| ActivitiesListImpl | Default implementation of  ActivitiesList. | 
| ActivityBuilder | |
| ActivityHelper | Helper class to deal with activity objects. | 
| ActivityImpl | Default implementation of  Activity. | 
| ActivityLinkBuilderDescriptor | Descriptor object for registering  ActivityLinkBuilders. | 
| ActivityLinkBuilderRegistry | Registry for activity link builders, handling merge of registered  ActivityLinkBuilderDescriptorelements. | 
| ActivityMessage | Immutable object representing an Activity message. | 
| ActivityMessageHelper | Helper class to compute links for  ActivityMessagecontent from an activity attributes. | 
| ActivityReply | |
| ActivityReplyMessage | |
| ActivityRepositoryInitializationHandler | |
| ActivityStream | |
| ActivityStreamFilterDescriptor | Descriptor object for registering  ActivityStreamFilters. | 
| ActivityStreamListener | Listener called asynchronously to save events as activities through the  ActivityStreamService. | 
| ActivityStreamRegistry | Registry for activity streams, handling merge of registered  ActivityStreamelements. | 
| ActivityStreamServiceImpl | Default implementation of  ActivityStreamService. | 
| ActivityUpgraderDescriptor | Descriptor object for registering  ActivityUpgraders. | 
| ActivityUpgraderRegistry | Registry for activity upgraders, handling merge of registered
  ActivityUpgraderDescriptorelements. | 
| ActivityVerb | An  ActivityVerbstores the configuration for a given activity verb:
 
 a label key
 an icon path | 
| ActivityVerbRegistry | Registry for activity verbs, handling merge of registered  ActivityVerbelements. | 
| DefaultActivityLinkBuilder | Default  ActivityLinkBuildercomputing URLs with the default id codec for documents and user codec for users. | 
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