content: /*
   * Copyright (C) 2018 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.android.launcher3.util;
  
  /**
   * Event tracker for reliably reproducing race conditions in tests.
   * The app should call onEvent() for events that the test will try to reproduce in all possible
   * orders.
   */
  public class RaceConditionTracker {
      public final static boolean ENTER = true;
      public final static boolean EXIT = false;
      static final String ENTER_POSTFIX = "enter";
      static final String EXIT_POSTFIX = "exit";
  
      public interface EventProcessor {
          void onEvent(String eventName);
      }
  
      private static EventProcessor sEventProcessor;
  
      static void setEventProcessor(EventProcessor eventProcessor) {
          sEventProcessor = eventProcessor;
      }
  
      public static void onEvent(String eventName) {
          if (sEventProcessor != null) sEventProcessor.onEvent(eventName);
      }
  
      public static void onEvent(String eventName, boolean isEnter) {
          if (sEventProcessor != null) {
              sEventProcessor.onEvent(enterExitEvt(eventName, isEnter));
          }
      }
  
      public static String enterExitEvt(String eventName, boolean isEnter) {
          return eventName + ":" + (isEnter ? ENTER_POSTFIX : EXIT_POSTFIX);
      }
  
      public static String enterEvt(String eventName) {
          return enterExitEvt(eventName, ENTER);
      }
  
      public static String exitEvt(String eventName) {
          return enterExitEvt(eventName, EXIT);
      }
  }
  