1 /*
2  * Copyright (C) 2019 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.systemui.car;
18 
19 import android.car.Car;
20 import android.content.Context;
21 
22 import androidx.annotation.VisibleForTesting;
23 
24 import java.util.ArrayList;
25 import java.util.List;
26 
27 import javax.inject.Inject;
28 import javax.inject.Singleton;
29 
30 /** Provides a common connection to the car service that can be shared. */
31 @Singleton
32 public class CarServiceProvider {
33 
34     private final Context mContext;
35     private final List<CarServiceOnConnectedListener> mListeners = new ArrayList<>();
36     private Car mCar;
37 
38     @Inject
CarServiceProvider(Context context)39     public CarServiceProvider(Context context) {
40         mContext = context;
41         mCar = Car.createCar(mContext, /* handler= */ null, Car.CAR_WAIT_TIMEOUT_DO_NOT_WAIT,
42                 (car, ready) -> {
43                     mCar = car;
44 
45                     synchronized (mListeners) {
46                         for (CarServiceOnConnectedListener listener : mListeners) {
47                             if (ready) {
48                                 listener.onConnected(mCar);
49                             }
50                         }
51                     }
52                 });
53     }
54 
55     @VisibleForTesting
CarServiceProvider(Context context, Car car)56     public CarServiceProvider(Context context, Car car) {
57         mContext = context;
58         mCar = car;
59     }
60 
61     /**
62      * Let's other components hook into the connection to the car service. If we're already
63      * connected to the car service, the callback is immediately triggered.
64      */
addListener(CarServiceOnConnectedListener listener)65     public void addListener(CarServiceOnConnectedListener listener) {
66         if (mCar.isConnected()) {
67             listener.onConnected(mCar);
68         }
69         mListeners.add(listener);
70     }
71 
72     /**
73      * Listener which is triggered when Car Service is connected.
74      */
75     public interface CarServiceOnConnectedListener {
76         /** This will be called when the car service has successfully been connected. */
onConnected(Car car)77         void onConnected(Car car);
78     }
79 }
80