1 /* 2 * Copyright (C) 2017 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.server.car; 18 19 import android.content.ComponentName; 20 import android.content.Context; 21 import android.content.Intent; 22 import android.content.ServiceConnection; 23 import android.os.Binder; 24 import android.os.IBinder; 25 import android.os.Parcel; 26 import android.os.RemoteException; 27 import android.os.UserHandle; 28 import android.util.Slog; 29 30 import com.android.internal.car.ICarServiceHelper; 31 import com.android.server.SystemService; 32 33 /** 34 * System service side companion service for CarService. 35 * Starts car service and provide necessary API for CarService. Only for car product. 36 */ 37 public class CarServiceHelperService extends SystemService { 38 private static final String TAG = "CarServiceHelper"; 39 private static final String CAR_SERVICE_INTERFACE = "android.car.ICar"; 40 private final ICarServiceHelperImpl mHelper = new ICarServiceHelperImpl(); 41 private IBinder mCarService; 42 private final ServiceConnection mCarServiceConnection = new ServiceConnection() { 43 44 @Override 45 public void onServiceConnected(ComponentName componentName, IBinder iBinder) { 46 Slog.i(TAG, "**CarService connected**"); 47 mCarService = iBinder; 48 // Cannot depend on ICar which is defined in CarService, so handle binder call directly 49 // instead. 50 // void setCarServiceHelper(in IBinder helper) 51 Parcel data = Parcel.obtain(); 52 data.writeInterfaceToken(CAR_SERVICE_INTERFACE); 53 data.writeStrongBinder(mHelper.asBinder()); 54 try { 55 mCarService.transact(IBinder.FIRST_CALL_TRANSACTION, // setCarServiceHelper 56 data, null, Binder.FLAG_ONEWAY); 57 } catch (RemoteException e) { 58 Slog.w(TAG, "RemoteException from car service", e); 59 handleCarServiceCrash(); 60 } 61 } 62 63 @Override 64 public void onServiceDisconnected(ComponentName componentName) { 65 handleCarServiceCrash(); 66 } 67 }; 68 69 public CarServiceHelperService(Context context) { 70 super(context); 71 } 72 73 @Override 74 public void onStart() { 75 Intent intent = new Intent(); 76 intent.setPackage("com.android.car"); 77 intent.setAction(CAR_SERVICE_INTERFACE); 78 if (!getContext().bindServiceAsUser(intent, mCarServiceConnection, Context.BIND_AUTO_CREATE, 79 UserHandle.SYSTEM)) { 80 Slog.wtf(TAG, "cannot start car service"); 81 } 82 } 83 84 private void handleCarServiceCrash() { 85 //TODO define recovery bahavior 86 } 87 88 private class ICarServiceHelperImpl extends ICarServiceHelper.Stub { 89 //TODO 90 } 91 } 92