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suspendCoroutineUninterceptedOrReturn<Unit> { cont -> | |
Compressor.compress(image)( | |
onSuccess = { | |
DispatcherContinuation(cont.context, cont).resumeWith(Result.success(Unit)) | |
} | |
) | |
COROUTINE_SUSPENDED | |
} |
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fun copyFiles(files: List<File>, destination: File){ | |
for(file in files){ | |
launch(Dispatcher.Background){ | |
... | |
} | |
} | |
} |
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class FileCopyFragment : Fragment() { | |
fun copyFiles(files: List<File>, destination: File) { | |
launch(Dispatcher.Background) { | |
for (file in files) { | |
val needsOverride = destination.listFiles()?.any { it.name == file.name } ?: false | |
if (needsOverride && !confirmFileOverride(file.name)) { | |
continue | |
} | |
file.copyTo(destination) | |
} |
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fun <T> (suspend () -> T).createCoroutine( | |
completion: Continuation<T> | |
): Continuation<Unit> { | |
val coroutine = createCoroutineUnintercepted(completion) | |
return DispatcherContinuation(completion.context,coroutine) | |
} |
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import android.os.Handler | |
import android.os.Looper | |
import kotlin.concurrent.thread | |
import kotlin.coroutines.Continuation | |
import kotlin.coroutines.CoroutineContext | |
import kotlin.coroutines.intrinsics.createCoroutineUnintercepted | |
import kotlin.coroutines.intrinsics.suspendCoroutineUninterceptedOrReturn | |
import kotlin.coroutines.intrinsics.COROUTINE_SUSPENDED | |
sealed class Dispatcher : CoroutineContext.Element { |
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suspend fun <T> suspendCoroutine(block: (Continuation<T>) -> Unit): T { | |
return suspendCoroutineUninterceptedOrReturn { cont -> | |
// block(cont) | |
val dispatchedContinuation = DispatcherContinuation(cont.context, cont) | |
block(dispatchedContinuation) | |
COROUTINE_SUSPENDED | |
} | |
} |
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// Resumes a coroutine on specified dispatcher | |
class DispatcherContinuation<T>( | |
override val context: CoroutineContext, | |
val continuation: Continuation<T> | |
) : Continuation<T> { | |
override fun resumeWith(result: Result<T>) { | |
when (context as Dispatcher) { | |
Dispatcher.Main -> Handler(Looper.getMainLooper()).post { | |
continuation.resumeWith(result) | |
} |
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fun launch(dispatcher: Dispatcher, block: suspend () -> Unit) { | |
val callback = object : Continuation<Unit> { | |
override val context: CoroutineContext = dispatcher | |
override fun resumeWith(result: Result<Unit>) {} | |
} | |
val coroutine = block.createCoroutineUnintercepted(callback) | |
// Duplicate code #1 | |
when (dispatcher) { | |
Dispatcher.Main -> Handler(Looper.getMainLooper()).post { | |
coroutine.resumeWith(Result.success(Unit)) |
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launch(Dispatcher.Main){ | |
println("Download Started") | |
// launch(Dispatcher.Background) | |
withContext(Dispatcher.Background) { | |
println("Download in progress") | |
downloader.download() | |
} | |
println("Download Complete") | |
} |
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suspend fun <R> withContext(dispatcher: Dispatcher, block: suspend () -> R): R { | |
return suspendCoroutineUninterceptedOrReturn<R> { cont -> | |
val callback = object : Continuation<R> { | |
override val context = dispatcher | |
override fun resumeWith(result: Result<R>) { | |
when (cont.context as Dispatcher) { | |
Dispatcher.Main -> Handler(Looper.getMainLooper()).post { | |
cont.resumeWith(result) | |
} |
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