sealed abstract class Batched[T] extends Serializable
Batched: the free semigroup.
For any type T, Batched[T] represents a way to lazily combine T values as a semigroup would (i.e.
associatively). A Semigroup[T] instance can be used to recover a T value from a Batched[T].
Like other free structures, Batched trades space for time. A sum of batched values defers the underlying
semigroup action, instead storing all values in memory (in a tree structure). If an underlying semigroup is
available, Batched.semigroup and Batch.monoid can be configured to periodically sum the tree to keep
the overall size below batchSize.
Batched[T] values are guaranteed not to be empty -- that is, they will contain at least one T value.
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- def append(that: TraversableOnce[T]): Batched[T]
Add more values to a batched value.
Add more values to a batched value.
This method will grow the tree to the left.
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- def combine(that: Batched[T]): Batched[T]
Combine two batched values.
Combine two batched values.
As mentioned above, this just creates a new tree structure containing
thisandthat. - def compact(batchSize: Int)(implicit s: Semigroup[T]): Batched[T]
Compact this batch if it exceeds
batchSize.Compact this batch if it exceeds
batchSize.Compacting a branch means summing it, and then storing the summed value in a new single-item batch.
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- def iterator: Iterator[T]
Provide an iterator over the underlying tree structure.
Provide an iterator over the underlying tree structure.
This is the order used by
.sum.This iterator traverses the tree from left-to-right. If the original expression was (w + x + y + z), this iterator returns w, x, y, and then z.
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- def reverseIterator: Iterator[T]
Provide a reversed iterator over the underlying tree structure.
Provide a reversed iterator over the underlying tree structure.
This iterator traverses the tree from right-to-left. If the original expression was (w + x + y + z), this iterator returns z, y, x, and then w.
- final def synchronized[T0](arg0: => T0): T0
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- def toList: List[T]
Convert the batch to a
List[T]. - def toString(): String
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