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Improve example for composing ZPipeline with ZSink #7910

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merged 3 commits into from
Mar 9, 2023
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Improve example for composing ZPipeline with ZSink #7910

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a677a7d
Improve example for composing ZPipeline with ZSink
gnp Mar 9, 2023
4f6068d
Make the pipe and sink composition explicit, and add types for clarity
gnp Mar 9, 2023
96e974b
Add import of CharacterCodingException and fix one type annotation
gnp Mar 9, 2023
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25 changes: 13 additions & 12 deletions docs/reference/stream/zpipeline.md
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Original file line number Diff line number Diff line change
Expand Up @@ -231,17 +231,18 @@ val lines: ZStream[Any, Throwable, String] =
2. **Composing ZPipeline with ZSink** — One pipeline can be composed with a sink, resulting in a sink that processes elements by piping them through the pipeline and piping the results into the sink:

```scala mdoc:silent:nest
val refine: ZIO[Any, Throwable, Long] =
ZStream
.fromFileName("file.txt")
.via(
ZPipeline.utf8Decode >>> ZPipeline.splitLines >>> ZPipeline.filter[String](_.contains('₿'))
)
.run(
ZSink
.fromFileName("file.refined.txt")
.contramapChunks[String](
_.flatMap(line => (line + System.lineSeparator()).getBytes())
)
import java.nio.charset.CharacterCodingException

val refine: ZIO[Any, Throwable, Long] = {
val stream: ZStream[Any, Throwable, Byte] = ZStream.fromFileName("file.txt")
val pipeline: ZPipeline[Any, CharacterCodingException, Byte, String] =
ZPipeline.utf8Decode >>> ZPipeline.splitLines >>> ZPipeline.filter[String](_.contains('₿'))
val fileSink: ZSink[Any, Throwable, String, Byte, Long] = ZSink
.fromFileName("file.refined.txt")
.contramapChunks[String](
_.flatMap(line => (line + System.lineSeparator()).getBytes())
)
val pipeSink: ZSink[Any, Throwable, Byte, Byte, Long] = pipeline >>> fileSink
stream >>> pipeSink
}
```