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abstract fun getItem(itemKey: String, callback: SuccessListener<SyncMapJava.Item?>): CancellationToken
Retrieve Item from the SyncMapJava.
Return
CancellationToken which allows to cancel network request.
Parameters
item
Key of the item to retrieve.
callback
Async result listener that will receive a value of the Item in its onSuccess() callback (null if item doesn't exist) or any error in onFailure() callback.