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authorAllan Wang <me@allanwang.ca>2019-01-04 23:03:50 -0500
committerGitHub <noreply@github.com>2019-01-04 23:03:50 -0500
commitd61ff7cb4f43d71d2170cdd25ceab2e3edcb81fc (patch)
treeb1fcd17ad4782ef1cb5cd3aba8539669fc2aac3c /core/src
parentab349293e52d77f6fc4b44446e19dc80aa8e789f (diff)
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Coroutine tests (#185)
* Add some coroutine tests for implicit cancellation * Create util test and new helper methods * Remove coroutinescope extension from withcontext * Update dependencies
Diffstat (limited to 'core/src')
-rw-r--r--core/src/main/kotlin/ca/allanwang/kau/utils/ContextUtils.kt27
-rw-r--r--core/src/main/kotlin/ca/allanwang/kau/utils/CoroutineUtils.kt60
-rw-r--r--core/src/test/kotlin/ca/allanwang/kau/kotlin/CoroutineTest.kt58
3 files changed, 118 insertions, 27 deletions
diff --git a/core/src/main/kotlin/ca/allanwang/kau/utils/ContextUtils.kt b/core/src/main/kotlin/ca/allanwang/kau/utils/ContextUtils.kt
index 09ad4ea..fc8049d 100644
--- a/core/src/main/kotlin/ca/allanwang/kau/utils/ContextUtils.kt
+++ b/core/src/main/kotlin/ca/allanwang/kau/utils/ContextUtils.kt
@@ -26,7 +26,6 @@ import android.content.pm.PackageManager
import android.graphics.drawable.Drawable
import android.net.Uri
import android.os.Bundle
-import android.os.Handler
import android.os.Looper
import android.util.TypedValue
import android.view.View
@@ -47,36 +46,10 @@ import androidx.core.content.ContextCompat
import ca.allanwang.kau.R
import ca.allanwang.kau.logging.KL
import com.afollestad.materialdialogs.MaterialDialog
-import kotlinx.coroutines.CoroutineScope
-import kotlinx.coroutines.android.asCoroutineDispatcher
-import kotlin.coroutines.CoroutineContext
/**
* Created by Allan Wang on 2017-06-03.
*/
-object ContextHelper : CoroutineScope {
-
- val looper = Looper.getMainLooper()
-
- val handler = Handler(looper)
-
- /**
- * Creating dispatcher from main handler to avoid IO
- * See https://github.com/Kotlin/kotlinx.coroutines/issues/878
- */
- val dispatcher = handler.asCoroutineDispatcher("kau-main")
-
- override val coroutineContext: CoroutineContext get() = dispatcher
-}
-
-/**
- * Most context items implement [CoroutineScope] by default.
- * We will add a fallback just in case.
- * It is expected that the scope returned always has the Android main dispatcher as part of the context.
- */
-internal inline val Context.ctxCoroutine: CoroutineScope
- get() = this as? CoroutineScope ?: ContextHelper
-
fun Context.runOnUiThread(f: Context.() -> Unit) {
if (ContextHelper.looper === Looper.myLooper()) f() else ContextHelper.handler.post { f() }
}
diff --git a/core/src/main/kotlin/ca/allanwang/kau/utils/CoroutineUtils.kt b/core/src/main/kotlin/ca/allanwang/kau/utils/CoroutineUtils.kt
new file mode 100644
index 0000000..032c407
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/utils/CoroutineUtils.kt
@@ -0,0 +1,60 @@
+package ca.allanwang.kau.utils
+
+import android.content.Context
+import android.os.Handler
+import android.os.Looper
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.CoroutineStart
+import kotlinx.coroutines.android.asCoroutineDispatcher
+import kotlinx.coroutines.async
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
+import kotlin.coroutines.CoroutineContext
+import kotlin.coroutines.EmptyCoroutineContext
+
+object ContextHelper : CoroutineScope {
+
+ val looper = Looper.getMainLooper()
+
+ val handler = Handler(looper)
+
+ /**
+ * Creating dispatcher from main handler to avoid IO
+ * See https://github.com/Kotlin/kotlinx.coroutines/issues/878
+ */
+ val dispatcher = handler.asCoroutineDispatcher("kau-main")
+
+ override val coroutineContext: CoroutineContext get() = dispatcher
+}
+
+/**
+ * Most context items implement [CoroutineScope] by default.
+ * We will add a fallback just in case.
+ * It is expected that the scope returned always has the Android main dispatcher as part of the context.
+ */
+internal inline val Context.ctxCoroutine: CoroutineScope
+ get() = this as? CoroutineScope ?: ContextHelper
+
+/**
+ * Calls [launch] with an explicit dispatcher for Android's main thread
+ */
+fun CoroutineScope.launchMain(
+ context: CoroutineContext = EmptyCoroutineContext,
+ start: CoroutineStart = CoroutineStart.DEFAULT,
+ block: suspend CoroutineScope.() -> Unit
+) = launch(ContextHelper.dispatcher + context, start, block)
+
+/**
+ * Calls [async] with an explicit dispatcher for Android's main thread
+ */
+fun CoroutineScope.asyncMain(
+ context: CoroutineContext = EmptyCoroutineContext,
+ start: CoroutineStart = CoroutineStart.DEFAULT,
+ block: suspend CoroutineScope.() -> Unit
+) = async(ContextHelper.dispatcher + context, start, block)
+
+/**
+ * Calls [withContext] with an explicit dispatcher for Android's main thread
+ */
+suspend fun <T> withMainContext(block: suspend CoroutineScope.() -> T) =
+ withContext(ContextHelper.dispatcher, block)
diff --git a/core/src/test/kotlin/ca/allanwang/kau/kotlin/CoroutineTest.kt b/core/src/test/kotlin/ca/allanwang/kau/kotlin/CoroutineTest.kt
new file mode 100644
index 0000000..91d0174
--- /dev/null
+++ b/core/src/test/kotlin/ca/allanwang/kau/kotlin/CoroutineTest.kt
@@ -0,0 +1,58 @@
+package ca.allanwang.kau.kotlin
+
+import kotlinx.coroutines.CancellationException
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.runBlocking
+import kotlinx.coroutines.withContext
+import org.junit.Test
+import kotlin.test.assertEquals
+import kotlin.test.fail
+
+/**
+ * Tests geared towards coroutines
+ */
+class CoroutineTest {
+
+ /**
+ * If a job is cancelled, then a switch to a new context will not run
+ */
+ @Test
+ fun implicitCancellationBefore() {
+ val job = Job()
+ var id = 0
+ try {
+ runBlocking(job) {
+ id++
+ job.cancel()
+ withContext(Dispatchers.IO) {
+ fail("Context switch should not be reached")
+ }
+ }
+ } catch (ignore: CancellationException) {
+ } finally {
+ assertEquals(1, id, "Launcher never executed")
+ }
+ }
+
+ /**
+ * If a job is cancelled, then a switch from a new context will not run
+ */
+ @Test
+ fun implicitCancellationAfter() {
+ val job = Job()
+ var id = 0
+ try {
+ runBlocking(job) {
+ withContext(Dispatchers.IO) {
+ id++
+ job.cancel()
+ }
+ fail("Post context switch should not be reached")
+ }
+ } catch (ignore: CancellationException) {
+ } finally {
+ assertEquals(1, id, "Context switch never executed")
+ }
+ }
+} \ No newline at end of file