1 /* 2 * Copyright (C) 2018 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.launcher3.util; 18 19 /** 20 * Event tracker for reliably reproducing race conditions in tests. 21 * The app should call onEvent() for events that the test will try to reproduce in all possible 22 * orders. 23 */ 24 public class RaceConditionTracker { 25 public final static boolean ENTER = true; 26 public final static boolean EXIT = false; 27 static final String ENTER_POSTFIX = "enter"; 28 static final String EXIT_POSTFIX = "exit"; 29 30 public interface EventProcessor { onEvent(String eventName)31 void onEvent(String eventName); 32 } 33 34 private static EventProcessor sEventProcessor; 35 setEventProcessor(EventProcessor eventProcessor)36 static void setEventProcessor(EventProcessor eventProcessor) { 37 sEventProcessor = eventProcessor; 38 } 39 onEvent(String eventName)40 public static void onEvent(String eventName) { 41 if (sEventProcessor != null) sEventProcessor.onEvent(eventName); 42 } 43 onEvent(String eventName, boolean isEnter)44 public static void onEvent(String eventName, boolean isEnter) { 45 if (sEventProcessor != null) { 46 sEventProcessor.onEvent(enterExitEvt(eventName, isEnter)); 47 } 48 } 49 enterExitEvt(String eventName, boolean isEnter)50 public static String enterExitEvt(String eventName, boolean isEnter) { 51 return eventName + ":" + (isEnter ? ENTER_POSTFIX : EXIT_POSTFIX); 52 } 53 enterEvt(String eventName)54 public static String enterEvt(String eventName) { 55 return enterExitEvt(eventName, ENTER); 56 } 57 exitEvt(String eventName)58 public static String exitEvt(String eventName) { 59 return enterExitEvt(eventName, EXIT); 60 } 61 } 62