1 /*
2  * Copyright (C) 2015 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 package com.android.car;
17 
18 import android.car.Car;
19 import android.car.test.ICarTest;
20 import android.content.Context;
21 import android.os.IBinder;
22 import android.os.RemoteException;
23 import android.util.Log;
24 
25 import java.io.PrintWriter;
26 import java.util.Arrays;
27 import java.util.HashMap;
28 import java.util.Map;
29 
30 /**
31  * Service to allow testing / mocking vehicle HAL.
32  * This service uses Vehicle HAL APIs directly (one exception) as vehicle HAL mocking anyway
33  * requires accessing that level directly.
34  */
35 class CarTestService extends ICarTest.Stub implements CarServiceBase {
36 
37     private static final String TAG = CarTestService.class.getSimpleName();
38 
39     private final Context mContext;
40     private final ICarImpl mICarImpl;
41 
42     private final Map<IBinder, TokenDeathRecipient> mTokens = new HashMap<>();
43 
CarTestService(Context context, ICarImpl carImpl)44     CarTestService(Context context, ICarImpl carImpl) {
45         mContext = context;
46         mICarImpl = carImpl;
47     }
48 
49     @Override
init()50     public void init() {
51         // nothing to do.
52         // This service should not reset anything for init / release to maintain mocking.
53     }
54 
55     @Override
release()56     public void release() {
57         // nothing to do
58         // This service should not reset anything for init / release to maintain mocking.
59     }
60 
61     @Override
dump(PrintWriter writer)62     public void dump(PrintWriter writer) {
63         writer.println("*CarTestService*");
64         writer.println(" mTokens:" + Arrays.toString(mTokens.entrySet().toArray()));
65     }
66 
67     @Override
stopCarService(IBinder token)68     public void stopCarService(IBinder token) throws RemoteException {
69         Log.d(TAG, "stopCarService, token: " + token);
70         ICarImpl.assertPermission(mContext, Car.PERMISSION_CAR_TEST_SERVICE);
71 
72         synchronized (this) {
73             if (mTokens.containsKey(token)) {
74                 Log.w(TAG, "Calling stopCarService twice with the same token.");
75                 return;
76             }
77 
78             TokenDeathRecipient deathRecipient = new TokenDeathRecipient(token);
79             mTokens.put(token, deathRecipient);
80             token.linkToDeath(deathRecipient, 0);
81 
82             if (mTokens.size() == 1) {
83                 mICarImpl.release();
84             }
85         }
86     }
87 
88     @Override
startCarService(IBinder token)89     public void startCarService(IBinder token) throws RemoteException {
90         Log.d(TAG, "startCarService, token: " + token);
91         ICarImpl.assertPermission(mContext, Car.PERMISSION_CAR_TEST_SERVICE);
92         releaseToken(token);
93     }
94 
releaseToken(IBinder token)95     private synchronized void releaseToken(IBinder token) {
96         Log.d(TAG, "releaseToken, token: " + token);
97         DeathRecipient deathRecipient = mTokens.remove(token);
98         if (deathRecipient != null) {
99             token.unlinkToDeath(deathRecipient, 0);
100         }
101 
102         if (mTokens.size() == 0) {
103             mICarImpl.init();
104         }
105     }
106 
107     private class TokenDeathRecipient implements DeathRecipient {
108         private final IBinder mToken;
109 
TokenDeathRecipient(IBinder token)110         TokenDeathRecipient(IBinder token) throws RemoteException {
111             mToken = token;
112         }
113 
114         @Override
binderDied()115         public void binderDied() {
116             releaseToken(mToken);
117         }
118     }
119 }