| /* |
| * 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 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, 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 visibleOnHandlerThread(handler: Handler, r: ThrowingRunnable) { |
| val cv = ConditionVariable() |
| handler.post { |
| try { |
| r.run() |
| } catch (exception: Exception) { |
| Log.e(TAG, "visibleOnHandlerThread caught exception", 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() |
| } |