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      1 /*
      2  * Copyright (C) 2013 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.server.location;
     17 
     18 import android.content.ComponentName;
     19 import android.content.Intent;
     20 import android.content.ServiceConnection;
     21 import android.hardware.location.GeofenceHardwareService;
     22 import android.hardware.location.IGeofenceHardware;
     23 import android.location.IGeofenceProvider;
     24 import android.location.IGpsGeofenceHardware;
     25 import android.location.IFusedGeofenceHardware;
     26 import android.content.Context;
     27 import android.os.Handler;
     28 import android.os.IBinder;
     29 import android.os.Message;
     30 import android.os.RemoteException;
     31 import android.os.UserHandle;
     32 import android.util.Log;
     33 import com.android.server.ServiceWatcher;
     34 
     35 import java.util.List;
     36 
     37 /**
     38  * @hide
     39  */
     40 public final class GeofenceProxy {
     41     private static final String TAG = "GeofenceProxy";
     42     private static final String SERVICE_ACTION =
     43             "com.android.location.service.GeofenceProvider";
     44     private final ServiceWatcher mServiceWatcher;
     45     private final Context mContext;
     46     private final IGpsGeofenceHardware mGpsGeofenceHardware;
     47     private final IFusedGeofenceHardware mFusedGeofenceHardware;
     48 
     49     private final Object mLock = new Object();
     50 
     51     // Access to mGeofenceHardware needs to be synchronized by mLock.
     52     private IGeofenceHardware mGeofenceHardware;
     53 
     54     private static final int GEOFENCE_PROVIDER_CONNECTED = 1;
     55     private static final int GEOFENCE_HARDWARE_CONNECTED = 2;
     56     private static final int GEOFENCE_HARDWARE_DISCONNECTED = 3;
     57     private static final int GEOFENCE_GPS_HARDWARE_CONNECTED = 4;
     58     private static final int GEOFENCE_GPS_HARDWARE_DISCONNECTED = 5;
     59 
     60     private Runnable mRunnable = new Runnable() {
     61         @Override
     62         public void run() {
     63             mHandler.sendEmptyMessage(GEOFENCE_PROVIDER_CONNECTED);
     64         }
     65     };
     66 
     67     public static GeofenceProxy createAndBind(Context context,
     68             int overlaySwitchResId, int defaultServicePackageNameResId,
     69             int initialPackageNamesResId, Handler handler, IGpsGeofenceHardware gpsGeofence,
     70             IFusedGeofenceHardware fusedGeofenceHardware) {
     71         GeofenceProxy proxy = new GeofenceProxy(context, overlaySwitchResId,
     72             defaultServicePackageNameResId, initialPackageNamesResId, handler, gpsGeofence,
     73             fusedGeofenceHardware);
     74         if (proxy.bindGeofenceProvider()) {
     75             return proxy;
     76         } else {
     77             return null;
     78         }
     79     }
     80 
     81     private GeofenceProxy(Context context,
     82             int overlaySwitchResId, int defaultServicePackageNameResId,
     83             int initialPackageNamesResId, Handler handler, IGpsGeofenceHardware gpsGeofence,
     84             IFusedGeofenceHardware fusedGeofenceHardware) {
     85         mContext = context;
     86         mServiceWatcher = new ServiceWatcher(context, TAG, SERVICE_ACTION, overlaySwitchResId,
     87             defaultServicePackageNameResId, initialPackageNamesResId, mRunnable, handler);
     88         mGpsGeofenceHardware = gpsGeofence;
     89         mFusedGeofenceHardware = fusedGeofenceHardware;
     90         bindHardwareGeofence();
     91     }
     92 
     93     private boolean bindGeofenceProvider() {
     94         return mServiceWatcher.start();
     95     }
     96 
     97     private void bindHardwareGeofence() {
     98         mContext.bindServiceAsUser(new Intent(mContext, GeofenceHardwareService.class),
     99                 mServiceConnection, Context.BIND_AUTO_CREATE, UserHandle.OWNER);
    100     }
    101 
    102     private ServiceConnection mServiceConnection = new ServiceConnection() {
    103         @Override
    104         public void onServiceConnected(ComponentName name, IBinder service) {
    105             synchronized (mLock) {
    106                 mGeofenceHardware = IGeofenceHardware.Stub.asInterface(service);
    107                 mHandler.sendEmptyMessage(GEOFENCE_HARDWARE_CONNECTED);
    108             }
    109         }
    110 
    111         @Override
    112         public void onServiceDisconnected(ComponentName name) {
    113             synchronized (mLock) {
    114                 mGeofenceHardware = null;
    115                 mHandler.sendEmptyMessage(GEOFENCE_HARDWARE_DISCONNECTED);
    116             }
    117         }
    118     };
    119 
    120     private void setGeofenceHardwareInProviderLocked() {
    121         try {
    122             IGeofenceProvider provider = IGeofenceProvider.Stub.asInterface(
    123                       mServiceWatcher.getBinder());
    124             if (provider != null) {
    125                 provider.setGeofenceHardware(mGeofenceHardware);
    126             }
    127         } catch (RemoteException e) {
    128             Log.e(TAG, "Remote Exception: setGeofenceHardwareInProviderLocked: " + e);
    129         }
    130     }
    131 
    132     private void setGpsGeofenceLocked() {
    133         try {
    134             mGeofenceHardware.setGpsGeofenceHardware(mGpsGeofenceHardware);
    135         } catch (RemoteException e) {
    136             Log.e(TAG, "Error while connecting to GeofenceHardwareService");
    137         }
    138     }
    139 
    140     private void setFusedGeofenceLocked() {
    141         try {
    142             mGeofenceHardware.setFusedGeofenceHardware(mFusedGeofenceHardware);
    143         } catch(RemoteException e) {
    144             Log.e(TAG, "Error while connecting to GeofenceHardwareService");
    145         }
    146     }
    147 
    148     // This needs to be reworked, when more services get added,
    149     // Might need a state machine or add a framework utility class,
    150     private Handler mHandler = new Handler() {
    151 
    152         @Override
    153         public void handleMessage(Message msg) {
    154             switch (msg.what) {
    155                 case GEOFENCE_PROVIDER_CONNECTED:
    156                     synchronized (mLock) {
    157                         if (mGeofenceHardware != null) {
    158                             setGeofenceHardwareInProviderLocked();
    159                         }
    160                         // else: the geofence provider will be notified when the connection to
    161                         // GeofenceHardwareService is established.
    162                     }
    163                     break;
    164                 case GEOFENCE_HARDWARE_CONNECTED:
    165                     synchronized (mLock) {
    166                         // Theoretically this won't happen because once the GeofenceHardwareService
    167                         // is connected to, we won't lose connection to it because it's a system
    168                         // service. But this check does make the code more robust.
    169                         if (mGeofenceHardware != null) {
    170                             setGpsGeofenceLocked();
    171                             setFusedGeofenceLocked();
    172                             setGeofenceHardwareInProviderLocked();
    173                         }
    174                     }
    175                     break;
    176                 case GEOFENCE_HARDWARE_DISCONNECTED:
    177                     synchronized (mLock) {
    178                         if (mGeofenceHardware == null) {
    179                             setGeofenceHardwareInProviderLocked();
    180                         }
    181                     }
    182                     break;
    183             }
    184         }
    185     };
    186 }
    187