Package com.apple.foundationdb.async

Utility functions for use within an asynchronous environment.

The data structures are designed to be compatible for use within a asynchronous environment in that they are all intended to be non-blocking. They are used within the Record Layer core library to implement some of the more advanced secondary index types.

The utility functions within the MoreAsyncUtil class are of a kind with the functions in the AsyncUtil class within the FoundationDB Java bindings. They encapsulate a few common uses of the CompletableFuture class.

Interface Summary

Interface	Description
AsyncPeekCallbackIterator<T>	An AsyncPeekCallbackIterator is an extension of the AsyncPeekIterator interface that can be given a callback to call after each time it advances.
AsyncPeekIterator<T>	A AsyncPeekIterator is an extension of the AsyncIterator interface that adds peek semantics, i.e., viewing the next element of the iterator without advancing it forward.
RankedSet.HashFunction	Function to compute the hash used to determine which levels a key value splits on.
RankedSet.Lookup

Class Summary

Class	Description
MoreAsyncUtil	More helpers in the spirit of AsyncUtil.
MoreAsyncUtil.AlwaysTrue<T>	A Boolean function that is always true.
MoreAsyncUtil.Holder<T>	A holder for a (mutable) value.
RangeSet	RangeSet supports efficient adding of ranges of keys into the database to support marking work done elsewhere as completed as well as checking if specific keys are already completed.
RankedSet	RankedSet supports the efficient retrieval of elements by their rank as defined by lexicographic order.
RankedSet.Config	Configuration settings for a RankedSet.
RankedSet.ConfigBuilder	Builder for RankedSet.Config.
RankedSet.Consistency
TaskNotifyingExecutor	An executor that can perform pre- and post- work in the context of the thread executing a task.

Exception Summary

Exception	Description
MoreAsyncUtil.DeadlineExceededException	Exception that will be thrown when the supplier in MoreAsyncUtil.getWithDeadline(long, Supplier) fails to complete within the specified deadline time.