com.netflix.hollow.api.consumer

Interface HollowConsumer.AnnouncementWatcher

All Known Implementing Classes:

HollowFilesystemAnnouncementWatcher

Enclosing class:

HollowConsumer

public static interface HollowConsumer.AnnouncementWatcher

Implementations of this class are responsible for two things:

1) Tracking the latest announced data state version. 2) Keeping the client up to date by calling triggerAsyncRefresh() on self when the latest version changes.

If an AnnouncementWatcher is provided to a HollowConsumer, then calling HollowConsumer#triggerRefreshTo() is unsupported.

Field Summary

Fields

Modifier and Type	Field and Description
static long	NO_ANNOUNCEMENT_AVAILABLE

Method Summary

Methods

Modifier and Type	Method and Description
long	getLatestVersion() Return the latest announced version.
void	subscribeToUpdates(HollowConsumer consumer) Implementations of this method should subscribe a HollowConsumer to updates to announced versions.

Field Detail

NO_ANNOUNCEMENT_AVAILABLE

static final long NO_ANNOUNCEMENT_AVAILABLE

See Also:

Constant Field Values

Method Detail

getLatestVersion

long getLatestVersion()

Return the latest announced version.

Returns:

subscribeToUpdates

void subscribeToUpdates(HollowConsumer consumer)

Implementations of this method should subscribe a HollowConsumer to updates to announced versions.

When announcements are received via a push mechanism, or polling reveals a new version, a call should be placed to one of the flavors of HollowConsumer.triggerRefresh() on the provided HollowConsumer.