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