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/*
* Copyright (C) 2019 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.
*/
@file:JvmName("HandlerUtils")
package com.android.testutils
import android.os.ConditionVariable
import android.os.Handler
import android.os.HandlerThread
import android.util.Log
import com.android.testutils.FunctionalUtils.ThrowingRunnable
import com.android.testutils.FunctionalUtils.ThrowingSupplier
import java.lang.Exception
import java.util.concurrent.Executor
import kotlin.test.fail
private const val TAG = "HandlerUtils"
/**
* Block until the specified Handler or HandlerThread becomes idle, or until timeoutMs has passed.
*/
fun HandlerThread.waitForIdle(timeoutMs: Int) = threadHandler.waitForIdle(timeoutMs.toLong())
fun HandlerThread.waitForIdle(timeoutMs: Long) = threadHandler.waitForIdle(timeoutMs)
fun Handler.waitForIdle(timeoutMs: Int) = waitForIdle(timeoutMs.toLong())
fun Handler.waitForIdle(timeoutMs: Long) {
val cv = ConditionVariable(false)
post(cv::open)
if (!cv.block(timeoutMs)) {
fail("Handler did not become idle after ${timeoutMs}ms")
}
}
/**
* Block until the given Serial Executor becomes idle, or until timeoutMs has passed.
*/
fun waitForIdleSerialExecutor(executor: Executor, timeoutMs: Long) {
val cv = ConditionVariable()
executor.execute(cv::open)
if (!cv.block(timeoutMs)) {
fail("Executor did not become idle after ${timeoutMs}ms")
}
}
/**
* Executes a block of code that returns a value, making its side effects visible on the caller and
* the handler thread.
*
* After this function returns, the side effects of the passed block of code are guaranteed to be
* observed both on the thread running the handler and on the thread running this method.
* To achieve this, this method runs the passed block on the handler and blocks this thread
* until it's executed, so keep in mind this method will block, (including, if the handler isn't
* running, blocking forever).
*/
fun <T> visibleOnHandlerThread(handler: Handler, supplier: ThrowingSupplier<T>): T {
val cv = ConditionVariable()
var rv: Result<T> = Result.failure(RuntimeException("Not run"))
handler.post {
try {
rv = Result.success(supplier.get())
} catch (exception: Exception) {
Log.e(TAG, "visibleOnHandlerThread caught exception", exception)
rv = Result.failure(exception)
}
cv.open()
}
// After block() returns, the handler thread has seen the change (since it ran it)
// and this thread also has seen the change (since cv.open() happens-before cv.block()
// returns).
cv.block()
return rv.getOrThrow()
}
/** Overload of visibleOnHandlerThread but executes a block of code that does not return a value. */
inline fun visibleOnHandlerThread(handler: Handler, r: ThrowingRunnable){
visibleOnHandlerThread(handler, ThrowingSupplier<Unit> { r.run() })
}
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