1 /* 2 * Copyright (C) 2016 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 import android.os.Looper; 20 21 import com.android.launcher3.LauncherModel; 22 import com.android.launcher3.config.FeatureFlags; 23 24 /** 25 * A set of utility methods for thread verification. 26 */ 27 public class Preconditions { 28 assertNotNull(Object o)29 public static void assertNotNull(Object o) { 30 if (FeatureFlags.IS_DOGFOOD_BUILD && o == null) { 31 throw new IllegalStateException(); 32 } 33 } 34 assertWorkerThread()35 public static void assertWorkerThread() { 36 if (FeatureFlags.IS_DOGFOOD_BUILD && !isSameLooper(LauncherModel.getWorkerLooper())) { 37 throw new IllegalStateException(); 38 } 39 } 40 assertUIThread()41 public static void assertUIThread() { 42 if (FeatureFlags.IS_DOGFOOD_BUILD && !isSameLooper(Looper.getMainLooper())) { 43 throw new IllegalStateException(); 44 } 45 } 46 assertNonUiThread()47 public static void assertNonUiThread() { 48 if (FeatureFlags.IS_DOGFOOD_BUILD && isSameLooper(Looper.getMainLooper())) { 49 throw new IllegalStateException(); 50 } 51 } 52 isSameLooper(Looper looper)53 private static boolean isSameLooper(Looper looper) { 54 return Looper.myLooper() == looper; 55 } 56 } 57