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 static com.android.launcher3.util.Executors.MODEL_EXECUTOR; 20 21 import android.os.Looper; 22 23 import com.android.launcher3.config.FeatureFlags; 24 25 /** 26 * A set of utility methods for thread verification. 27 */ 28 public class Preconditions { 29 assertNotNull(Object o)30 public static void assertNotNull(Object o) { 31 if (FeatureFlags.IS_STUDIO_BUILD && o == null) { 32 throw new IllegalStateException(); 33 } 34 } 35 assertWorkerThread()36 public static void assertWorkerThread() { 37 if (FeatureFlags.IS_STUDIO_BUILD && !isSameLooper(MODEL_EXECUTOR.getLooper())) { 38 throw new IllegalStateException(); 39 } 40 } 41 assertUIThread()42 public static void assertUIThread() { 43 if (FeatureFlags.IS_STUDIO_BUILD && !isSameLooper(Looper.getMainLooper())) { 44 throw new IllegalStateException(); 45 } 46 } 47 assertNonUiThread()48 public static void assertNonUiThread() { 49 if (FeatureFlags.IS_STUDIO_BUILD && isSameLooper(Looper.getMainLooper())) { 50 throw new IllegalStateException(); 51 } 52 } 53 isSameLooper(Looper looper)54 private static boolean isSameLooper(Looper looper) { 55 return Looper.myLooper() == looper; 56 } 57 } 58