Created
March 4, 2019 06:50
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SQLDelight Kotlin Multiplatform Project sample
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internal expect fun <B> backToFront(b: () -> B, job: (B) -> Unit) |
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private val btfHandler = Handler(Looper.getMainLooper()) | |
internal actual fun <B> backToFront(b: () -> B, job: (B) -> Unit) { | |
btfHandler.post { job(b()) } | |
} |
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internal actual fun <B> backToFront(b: () -> B, job: (B) -> Unit) { | |
dispatch_async_f( | |
dispatch_get_main_queue(), | |
DetachedObjectGraph { JobAndThing(job.freeze(), b()) }.asCPointer(), | |
staticCFunction { p: COpaquePointer? -> | |
initRuntimeIfNeeded() | |
@Suppress("UNCHECKED_CAST") val result = DetachedObjectGraph<Any>(p).attach() as JobAndThing<B> | |
result.job(result.thing) | |
}) | |
} |
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import com.codingfeline.github.platform.backToFront | |
import com.squareup.sqldelight.Query | |
import kotlinx.coroutines.ExperimentalCoroutinesApi | |
import kotlinx.coroutines.channels.Channel | |
import kotlinx.coroutines.channels.consumeEach | |
import co.touchlab.stately.concurrency.ThreadLocalRef | |
@ExperimentalCoroutinesApi | |
fun <T : Any> Query<T>.asChannel(): ReceiveChannel<Query<T>> { | |
val channel = Channel<Query<T>>(Channel.CONFLATED) | |
channel.offer(this) | |
val ref = ThreadLocalRef<(Query<T>) -> Unit>() | |
ref.set { channel.offer(it) } | |
val listener = object : Query.Listener, (Throwable?) -> Unit { | |
override fun queryResultsChanged() { | |
backToFront({ this@asChannel }, { q -> ref.get()?.let { it(q) } }) | |
} | |
override fun invoke(t: Throwable?) { | |
ref.remove() | |
removeListener(this) | |
} | |
} | |
addListener(listener) | |
channel.invokeOnClose(listener) | |
return channel | |
} |
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