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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