1 /*
2  * Copyright (C) 2018 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
5  * except in compliance with the License. You may obtain a copy of the License at
6  *
7  *      http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software distributed under the
10  * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
11  * KIND, either express or implied. See the License for the specific language governing
12  * permissions and limitations under the License.
13  */
14 
15 package com.android.systemui;
16 
17 import com.android.systemui.dagger.SysUISingleton;
18 
19 import java.util.ArrayList;
20 
21 import javax.inject.Inject;
22 
23 /**
24  * Created by {@link Dependency} on SystemUI startup. Add tasks which need to be executed only
25  * after all other dependencies have been created.
26  */
27 @SysUISingleton
28 public class InitController {
29 
30     /**
31      * If a task is added after all tasks are executed, then we've done something terribly wrong
32      */
33     private boolean mTasksExecuted = false;
34 
35     private final ArrayList<Runnable> mTasks = new ArrayList<>();
36 
37     @Inject
InitController()38     public InitController() {
39     }
40 
41     /**
42      * Add a task to be executed after {@link Dependency#start()}
43      * @param runnable the task to be executed
44      */
addPostInitTask(Runnable runnable)45     public void addPostInitTask(Runnable runnable) {
46         if (mTasksExecuted) {
47             throw new IllegalStateException("post init tasks have already been executed!");
48         }
49         mTasks.add(runnable);
50     }
51 
52     /**
53      * Run post-init tasks and remove them from the tasks list
54      */
executePostInitTasks()55     public void executePostInitTasks() {
56         while (!mTasks.isEmpty()) {
57             mTasks.remove(0).run();
58         }
59 
60         mTasksExecuted = true;
61     }
62 }
63