| /* |
| * Copyright (C) 2014 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.google.android.apps.common.testing.ui.espresso; |
| |
| /** |
| * Represents a resource of an application under test which can cause asynchronous background work |
| * to happen during test execution (e.g. an intent service that processes a button click). By |
| * default, {@link Espresso} synchronizes all view operations with the UI thread as well as |
| * AsyncTasks; however, it has no way of doing so with "hand-made" resources. In such cases, test |
| * authors can register the custom resource and {@link Espresso} will wait for the resource to |
| * become idle prior to executing a view operation. |
| * <br><br> |
| * <b>Important Note:</b> it is assumed that the resource stays idle most of the time. |
| */ |
| public interface IdlingResource { |
| |
| /** |
| * Returns the name of the resources (used for logging and idempotency of registration). |
| */ |
| public String getName(); |
| |
| /** |
| * Returns {@code true} if resource is currently idle. Espresso will <b>always</b> call this |
| * method from the main thread, therefore it should be non-blocking and return immediately. |
| */ |
| public boolean isIdleNow(); |
| |
| /** |
| * Registers the given {@link ResourceCallback} with the resource. Espresso will call this method: |
| * <ul> |
| * <li>with its implementation of {@link ResourceCallback} so it can be notified asynchronously |
| * that your resource is idle |
| * <li>from the main thread, but you are free to execute the callback's onTransitionToIdle from |
| * any thread |
| * <li>once (when it is initially given a reference to your IdlingResource) |
| * </ul> |
| * <br> |
| * You only need to call this upon transition from busy to idle - if the resource is already idle |
| * when the method is called invoking the call back is optional and has no significant impact. |
| */ |
| public void registerIdleTransitionCallback(ResourceCallback callback); |
| |
| /** |
| * Registered by an {@link IdlingResource} to notify Espresso of a transition to idle. |
| */ |
| public interface ResourceCallback { |
| /** |
| * Called when the resource goes from busy to idle. |
| */ |
| public void onTransitionToIdle(); |
| } |
| } |