Offline Region Observer
interface OfflineRegionObserver
A region can have a single observer, which gets notified whenever a change to the region's status occurs.
Functions
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Implement this method to be notified of errors encountered while downloading regional resources. Such errors may be recoverable; for example the implementation will attempt to re-request failed resources based on an exponential backoff algorithm, or when it detects that network access has been restored.
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Implement this method to be notified of a change in the status of an offline region. Status changes include any change in state of the members of OfflineRegionStatus.