main.shark.ThrowingCancelableFileSourceProvider.kt Maven / Gradle / Ivy
package shark
import java.io.File
import java.io.IOException
import okio.Buffer
import okio.BufferedSource
import okio.Okio
import okio.Source
/**
* A [DualSourceProvider] that invokes [throwIfCanceled] before every read, allowing
* cancellation of IO based work built on top by throwing an exception.
*/
class ThrowingCancelableFileSourceProvider(
private val file: File,
private val throwIfCanceled: Runnable
) : DualSourceProvider {
override fun openStreamingSource(): BufferedSource {
val realSource = Okio.source(file.inputStream())
return Okio.buffer(object : Source by realSource {
override fun read(
sink: Buffer,
byteCount: Long
): Long {
throwIfCanceled.run()
return realSource.read(sink, byteCount)
}
})
}
override fun openRandomAccessSource(): RandomAccessSource {
val channel = file.inputStream().channel
return object : RandomAccessSource {
override fun read(
sink: Buffer,
position: Long,
byteCount: Long
): Long {
throwIfCanceled.run()
return channel.transferTo(position, byteCount, sink)
}
override fun close() {
try {
channel.close()
} catch (ignored: Throwable) {
SharkLog.d(ignored) { "Failed to close file, ignoring" }
}
}
}
}
}