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Optimize ZPipeline::mapEitherChunked #9816

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Merged
merged 3 commits into from
Aug 22, 2025
Merged

Optimize ZPipeline::mapEitherChunked #9816

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45d3afa
Optimize `ZPipeline::mapEitherChunked`
guizmaii Apr 22, 2025
19cf1e4
Merge branch 'series/2.x' into opt_mapEitherChunked
guizmaii Jul 29, 2025
0e0684b
Review: Prefer `index < size`
guizmaii Jul 29, 2025
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15 changes: 8 additions & 7 deletions streams/shared/src/main/scala/zio/stream/ZPipeline.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -1844,22 +1844,23 @@ object ZPipeline extends ZPipelinePlatformSpecificConstructors {
chunk => {
val size = chunk.size

if (size == 0) reader
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In another PR, we were talking about the fact that this Chunk can probably never be empty

else if (size == 1) {
if (size == 1) {
val a = chunk.head

f(a) match {
case r: Right[?, Out] => ZChannel.write(Chunk.single(r.value)) *> reader
case l: Left[Err, ?] => ZChannel.refailCause(Cause.fail(l.value))
}
} else {
val builder: ChunkBuilder[Out] = ChunkBuilder.make[Out](chunk.size)
val iterator: Iterator[In] = chunk.iterator
val builder: ChunkBuilder[Out] = ChunkBuilder.make[Out](size)
val iterator = chunk.chunkIterator
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TIL about ChunkIterator

image

var index: Int = 0
var error: Err = null.asInstanceOf[Err]

while (iterator.hasNext && (error == null)) {
val a = iterator.next()
f(a) match {
while (index < size && error == null) {
val in = iterator.nextAt(index)
index += 1
f(in) match {
case r: Right[?, Out] => builder.addOne(r.value)
case l: Left[Err, ?] => error = l.value
}
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