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Add basic threading strategy support
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,57 @@ | ||
| package com.juul.kable | ||
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| import android.os.Build | ||
| import android.os.Handler | ||
| import android.os.HandlerThread | ||
| import kotlinx.coroutines.CoroutineDispatcher | ||
| import kotlinx.coroutines.DelicateCoroutinesApi | ||
| import kotlinx.coroutines.ExecutorCoroutineDispatcher | ||
| import kotlinx.coroutines.ExperimentalCoroutinesApi | ||
| import kotlinx.coroutines.android.asCoroutineDispatcher | ||
| import kotlinx.coroutines.newSingleThreadContext | ||
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| public sealed class Threading { | ||
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| internal abstract val dispatcher: CoroutineDispatcher | ||
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| /** Used on Android O (API 26) and above. */ | ||
| internal data class Handler( | ||
| val thread: HandlerThread, | ||
| val handler: android.os.Handler, | ||
| override val dispatcher: CoroutineDispatcher, | ||
| ) : Threading() | ||
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| /** Used on Android versions **lower** than Android O (API 26). */ | ||
| internal data class SingleThreadContext( | ||
| val name: String, | ||
| override val dispatcher: ExecutorCoroutineDispatcher, | ||
| ) : Threading() | ||
| } | ||
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| public val Threading.name: String | ||
| get() = when (this) { | ||
| is Threading.Handler -> thread.name | ||
| is Threading.SingleThreadContext -> name | ||
| } | ||
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| public fun Threading.shutdown() { | ||
| when (this) { | ||
| is Threading.Handler -> thread.quit() | ||
| is Threading.SingleThreadContext -> dispatcher.close() | ||
| } | ||
| } | ||
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| /** | ||
| * Creates [Threading] that can be used for Bluetooth communication. The returned [Threading] is | ||
| * returned in a started state and must be [shutdown] when no longer needed. | ||
| */ | ||
| public fun Threading(name: String): Threading = | ||
| if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) { | ||
| val thread = HandlerThread(name).apply { start() } | ||
| val handler = Handler(thread.looper) | ||
| val dispatcher = handler.asCoroutineDispatcher() | ||
| Threading.Handler(thread, handler, dispatcher) | ||
| } else { // Build.VERSION.SDK_INT < Build.VERSION_CODES.O | ||
| @OptIn(DelicateCoroutinesApi::class, ExperimentalCoroutinesApi::class) | ||
| Threading.SingleThreadContext(name, newSingleThreadContext(name)) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,62 @@ | ||
| package com.juul.kable | ||
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| import kotlinx.atomicfu.atomic | ||
| import kotlinx.atomicfu.locks.reentrantLock | ||
| import kotlinx.atomicfu.locks.withLock | ||
| import kotlinx.coroutines.CoroutineScope | ||
| import kotlinx.coroutines.CoroutineStart.LAZY | ||
| import kotlinx.coroutines.GlobalScope | ||
| import kotlinx.coroutines.delay | ||
| import kotlinx.coroutines.launch | ||
| import kotlin.time.Duration | ||
| import kotlin.time.Duration.Companion.minutes | ||
| import kotlin.time.TimeMark | ||
| import kotlin.time.TimeSource | ||
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| private val threadNumber = atomic(0) | ||
| private fun generateThreadName() = "Kable#${threadNumber.incrementAndGet()}" | ||
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| public interface ThreadingStrategy { | ||
| public fun acquire(): Threading | ||
| public fun release(threading: Threading) | ||
| } | ||
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| public object OnDemandThreadingStrategy : ThreadingStrategy { | ||
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| override fun acquire(): Threading = Threading(generateThreadName()) | ||
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| override fun release(threading: Threading) { | ||
| threading.shutdown() | ||
| } | ||
| } | ||
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| public class PooledThreadingStrategy( | ||
| scope: CoroutineScope = GlobalScope, | ||
| private val evictAfter: Duration = 1.minutes, | ||
| ) : ThreadingStrategy { | ||
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| private val pool = mutableListOf<Pair<TimeMark, Threading>>() | ||
| private val guard = reentrantLock() | ||
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| private val evictionJob = scope.launch(start = LAZY) { | ||
| while (true) { | ||
| guard.withLock { | ||
| pool.removeAll { (timeMark) -> timeMark.hasPassedNow() } | ||
| } | ||
| delay(evictAfter / 2) | ||
| } | ||
| } | ||
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| internal fun start(): Boolean = evictionJob.start() | ||
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| override fun acquire(): Threading = guard.withLock { | ||
| pool.removeFirstOrNull()?.second | ||
| } ?: Threading(generateThreadName()) | ||
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| override fun release(threading: Threading) { | ||
| guard.withLock { | ||
| val evictAt = TimeSource.Monotonic.markNow() + evictAfter | ||
| pool.add(evictAt to threading) | ||
| } | ||
| } | ||
| } |
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