| /* |
| * Copyright (C) 2021 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 android.perftests.utils; |
| |
| import android.app.Instrumentation; |
| |
| import androidx.annotation.NonNull; |
| import androidx.test.InstrumentationRegistry; |
| |
| import java.util.concurrent.atomic.AtomicReference; |
| import java.util.function.Supplier; |
| |
| public final class TestUtils { |
| |
| /** |
| * Retrieves a value that needs to be obtained on the main thread. |
| * |
| * <p>A simple utility method that helps to return an object from the UI thread.</p> |
| * |
| * @param supplier callback to be called on the UI thread to return a value |
| * @param <T> Type of the value to be returned |
| * @return Value returned from {@code supplier} |
| */ |
| public static <T> T getOnMainSync(@NonNull Supplier<T> supplier) { |
| final AtomicReference<T> result = new AtomicReference<>(); |
| final Instrumentation instrumentation = InstrumentationRegistry.getInstrumentation(); |
| instrumentation.runOnMainSync(() -> result.set(supplier.get())); |
| return result.get(); |
| } |
| } |