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/*
* Copyright (C) 2022 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.adblib.tools.debugging.utils
import com.android.adblib.AutoShutdown
import com.android.adblib.testingutils.CoroutineTestUtils.runBlockingWithTimeout
import com.android.adblib.tools.testutils.AdbLibToolsTestBase
import kotlinx.coroutines.Job
import kotlinx.coroutines.delay
import kotlinx.coroutines.joinAll
import kotlinx.coroutines.launch
import org.junit.Assert
import org.junit.Test
import java.util.concurrent.atomic.AtomicBoolean
import java.util.concurrent.atomic.AtomicInteger
class ReferenceCountedResourceTest : AdbLibToolsTestBase() {
@Test
fun testUnderlyingResourceIsNotCreatedRightAway() = runBlockingWithTimeout {
// Prepare
val res = MyTestResource()
/*val ref = */ReferenceCountedResource(session) {
res.creationCount.incrementAndGet()
res
}
// Assert
Assert.assertEquals(0, res.creationCount.get())
Assert.assertFalse(res.shutdownCalled.get())
Assert.assertFalse(res.closeCalled.get())
}
@Test
fun testUnderlyingResourceIsCreatedLazily() = runBlockingWithTimeout {
// Prepare
val res = MyTestResource()
val ref = ReferenceCountedResource(session) {
res.creationCount.incrementAndGet()
res
}
// Act
ref.retain()
// Assert
Assert.assertEquals(1, res.creationCount.get())
Assert.assertFalse(res.shutdownCalled.get())
Assert.assertFalse(res.closeCalled.get())
}
@Test
fun testUnderlyingResourceIsShutDownOnRelease() = runBlockingWithTimeout {
// Prepare
val res = MyTestResource()
val ref = ReferenceCountedResource(session) {
res.creationCount.incrementAndGet()
res
}
// Act
ref.retain()
ref.release()
// Assert
Assert.assertEquals(1, res.creationCount.get())
Assert.assertTrue(res.shutdownCalled.get())
Assert.assertTrue(res.closeCalled.get())
}
@Test
fun testUnderlyingResourceIsClosedOnClose() = runBlockingWithTimeout {
// Prepare
val res = MyTestResource()
val ref = ReferenceCountedResource(session) {
res.creationCount.incrementAndGet()
res
}
// Act
ref.retain()
ref.close()
// Assert
Assert.assertEquals(1, res.creationCount.get())
Assert.assertFalse(res.shutdownCalled.get())
Assert.assertTrue(res.closeCalled.get())
}
@Test
fun testUnderlyingResourceIsCreatedOnlyOnce() = runBlockingWithTimeout {
// Prepare
val res = MyTestResource()
val ref = ReferenceCountedResource(session) {
res.creationCount.incrementAndGet()
res
}
// Act
ref.retain()
ref.retain()
// Assert
Assert.assertEquals(1, res.creationCount.get())
Assert.assertFalse(res.shutdownCalled.get())
Assert.assertFalse(res.closeCalled.get())
}
@Test
fun testUnderlyingResourceIsCreatedOnlyOnceFromConcurrentThreads() = runBlockingWithTimeout {
// Prepare
val res = MyTestResource()
val ref = ReferenceCountedResource(session) {
res.creationCount.incrementAndGet()
res
}
// Act
val jobs = mutableListOf<Job>()
for(i in 1..100) {
jobs.add(launch {
for (j in 1..100) {
ref.retain()
// Release all except first one to ensure resource is not closed
if (j >= 2) {
ref.release()
}
}
})
}
jobs.joinAll()
// Assert
Assert.assertEquals(1, res.creationCount.get())
Assert.assertFalse(res.shutdownCalled.get())
Assert.assertFalse(res.closeCalled.get())
}
@Test
fun testUnderlyingResourceIsClosedFromConcurrentThreads() = runBlockingWithTimeout {
// Prepare
val res = MyTestResource()
val ref = ReferenceCountedResource(session) {
res.creationCount.incrementAndGet()
res.closeCalled.set(false)
res
}
// Act
val jobs = mutableListOf<Job>()
for(i in 1..100) {
jobs.add(launch {
for (j in 1..100) {
ref.withResource { }
}
})
}
jobs.joinAll()
// Assert
Assert.assertTrue(res.creationCount.get() >= 1)
Assert.assertTrue(res.shutdownCalled.get())
Assert.assertTrue(res.closeCalled.get())
}
@Test
fun testUnderlyingResourceIsCreatedOnlyOnceEvenIfDelayed() = runBlockingWithTimeout {
// Prepare
val res = MyTestResource()
val ref = ReferenceCountedResource(session) {
delay(100)
res.creationCount.incrementAndGet()
res
}
// Act
joinAll(launch { ref.retain() }, launch { ref.retain() })
// Assert
Assert.assertEquals(1, res.creationCount.get())
Assert.assertFalse(res.shutdownCalled.get())
Assert.assertFalse(res.closeCalled.get())
}
@Test
fun testUnderlyingResourceCreationIsCancelledIfRefIsClosedEarly() = runBlockingWithTimeout {
// Prepare
val res = MyTestResource()
val ref = ReferenceCountedResource(session) {
delay(10_000)
res.creationCount.incrementAndGet()
res
}
// Act
val job = launch {
ref.retain()
}
delay(100) // This is much lower than the resource creation delay
ref.close() // this should cancel the job to create the resource instance
job.join() // this makes sure cancellation is propagated to the "retain" call
// Assert
Assert.assertEquals(0, res.creationCount.get())
Assert.assertFalse(res.closeCalled.get())
Assert.assertFalse(res.shutdownCalled.get())
Assert.assertTrue(job.isCancelled)
}
class MyTestResource : AutoShutdown {
val creationCount = AtomicInteger()
val closeCalled = AtomicBoolean(false)
val shutdownCalled = AtomicBoolean(false)
override suspend fun shutdown() {
shutdownCalled.set(true)
}
override fun close() {
closeCalled.set(true)
}
}
}
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