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Dec 2, 2022
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document fromAutoClosable #7575

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document fromAutoClosable
DaniRey Nov 30, 2022
b2667ce
use attemptBlocking instead of attemptBlockingIO
DaniRey Nov 30, 2022
a004675
Wrap stream creation and consumption in scope
DaniRey Nov 30, 2022
ba87b64
Omit unnecessary curly braces
DaniRey Nov 30, 2022
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18 changes: 18 additions & 0 deletions docs/overview/handling_resources.md
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Expand Up @@ -71,6 +71,24 @@ val groupedFileData: IO[IOException, Unit] =

Like `ensuring`, `acquireReleaseWith` has compositional semantics, so if one `acquireReleaseWith` is nested inside another `acquireReleaseWith`, and the outer resource is acquired, then the outer release will always be called, even if, for example, the inner release fails.

For resources which implement the AutoClosable interface, the convenience method `fromAutoClosable` can be used, which can be seen as the ZIO equivalent of try-with-resource.

```scala mdoc:invisible
import zio._
import java.io.FileInputStream
def openFileInputStream(name: String): IO[Throwable, FileInputStream] = ZIO.attemptBlocking(new FileInputStream(name))
```

```scala mdoc:silent
val bytesInFile: IO[Throwable, Int] =
ZIO.scoped {
for {
stream <- ZIO.fromAutoCloseable(openFileInputStream("data.json"))
data <- ZIO.attemptBlockingIO(stream.readAllBytes())
} yield data.length
}
```

## Next Steps

If you are comfortable with basic resource handling, the next step is to learn about [basic concurrency](basic_concurrency.md).