git.gag.com Git - fw/altos/blob - altosdroid/src/org/altusmetrum/AltosDroid/TelemetryService.java

   1 /*
   2  * Copyright © 2012 Mike Beattie <mike@ethernal.org>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; version 2 of the License.
   7  *
   8  * This program is distributed in the hope that it will be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along
  14  * with this program; if not, write to the Free Software Foundation, Inc.,
  15  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  16  */
  17
  18 package org.altusmetrum.AltosDroid;
  19
  20 import java.lang.ref.WeakReference;
  21 import java.util.ArrayList;
  22 import java.util.concurrent.TimeoutException;
  23
  24 import android.app.Notification;
  25 //import android.app.NotificationManager;
  26 import android.app.PendingIntent;
  27 import android.app.Service;
  28 import android.bluetooth.BluetoothDevice;
  29 import android.content.Intent;
  30 //import android.os.Bundle;
  31 import android.os.IBinder;
  32 import android.os.Handler;
  33 import android.os.Message;
  34 import android.os.Messenger;
  35 import android.os.RemoteException;
  36 import android.util.Log;
  37 import android.widget.Toast;
  38
  39 //import org.altusmetrum.AltosLib.*;
  40
  41 public class TelemetryService extends Service {
  42
  43         private static final String TAG = "TelemetryService";
  44         private static final boolean D = true;
  45
  46         static final int MSG_REGISTER_CLIENT   = 1;
  47         static final int MSG_UNREGISTER_CLIENT = 2;
  48         static final int MSG_CONNECT           = 3;
  49         static final int MSG_CONNECTED         = 4;
  50         static final int MSG_CONNECT_FAILED    = 5;
  51         static final int MSG_DISCONNECTED      = 6;
  52         static final int MSG_TELEMETRY         = 7;
  53
  54         public static final int STATE_NONE       = 0;
  55         public static final int STATE_READY      = 1;
  56         public static final int STATE_CONNECTING = 2;
  57         public static final int STATE_CONNECTED  = 3;
  58
  59         // Unique Identification Number for the Notification.
  60         // We use it on Notification start, and to cancel it.
  61         private int NOTIFICATION = R.string.telemetry_service_label;
  62         //private NotificationManager mNM;
  63
  64         ArrayList<Messenger> mClients = new ArrayList<Messenger>(); // Keeps track of all current registered clients.
  65         final Handler   mHandler   = new IncomingHandler(this);
  66         final Messenger mMessenger = new Messenger(mHandler); // Target we publish for clients to send messages to IncomingHandler.
  67
  68         // Name of the connected device
  69         private BluetoothDevice device = null;
  70         private AltosBluetooth mAltosBluetooth = null;
  71         private TelemetryReader mTelemetryReader = null;
  72
  73         // internally track state of bluetooth connection
  74         private int state = STATE_NONE;
  75
  76         // Handler of incoming messages from clients.
  77         static class IncomingHandler extends Handler {
  78                 private final WeakReference<TelemetryService> service;
  79                 IncomingHandler(TelemetryService s) { service = new WeakReference<TelemetryService>(s); }
  80
  81                 @Override
  82                 public void handleMessage(Message msg) {
  83                         TelemetryService s = service.get();
  84                         switch (msg.what) {
  85                         case MSG_REGISTER_CLIENT:
  86                                 s.mClients.add(msg.replyTo);
  87                                 try {
  88                                         msg.replyTo.send(Message.obtain(null, AltosDroid.MSG_DEVNAME, s.device.getName()));
  89                                         msg.replyTo.send(Message.obtain(null, AltosDroid.MSG_STATE_CHANGE, s.state, -1));
  90                                 } catch (RemoteException e) {
  91                                         s.mClients.remove(msg.replyTo);
  92                                 }
  93                                 if (D) Log.d(TAG, "Client bound to service");
  94                                 break;
  95                         case MSG_UNREGISTER_CLIENT:
  96                                 s.mClients.remove(msg.replyTo);
  97                                 if (D) Log.d(TAG, "Client unbound from service");
  98                                 break;
  99                         case MSG_CONNECT:
 100                                 if (D) Log.d(TAG, "Connect command received");
 101                                 s.device = (BluetoothDevice) msg.obj;
 102                                 s.startAltosBluetooth();
 103                                 break;
 104                         case MSG_CONNECTED:
 105                                 if (D) Log.d(TAG, "Connected to device");
 106                                 s.connected();
 107                                 break;
 108                         case MSG_CONNECT_FAILED:
 109                                 if (D) Log.d(TAG, "Connection failed... retrying");
 110                                 s.startAltosBluetooth();
 111                                 break;
 112                         case MSG_DISCONNECTED:
 113                                 // Only do the following if we haven't been shutdown elsewhere..
 114                                 if (s.device != null) {
 115                                         if (D) Log.d(TAG, "Disconnected from " + s.device.getName());
 116                                         s.stopAltosBluetooth();
 117                                 }
 118                                 break;
 119                         case MSG_TELEMETRY:
 120                                 s.sendMessageToClients(Message.obtain(null, AltosDroid.MSG_TELEMETRY, msg.obj));
 121                                 break;
 122                         default:
 123                                 super.handleMessage(msg);
 124                         }
 125                 }
 126         }
 127
 128         private void sendMessageToClients(Message m) {
 129                 for (int i=mClients.size()-1; i>=0; i--) {
 130                         try {
 131                                 mClients.get(i).send(m);
 132                         } catch (RemoteException e) {
 133                                 mClients.remove(i);
 134                         }
 135                 }
 136         }
 137
 138         private void stopAltosBluetooth() {
 139                 if (D) Log.d(TAG, "stopAltosBluetooth(): begin");
 140                 setState(STATE_READY);
 141                 if (mTelemetryReader != null) {
 142                         if (D) Log.d(TAG, "stopAltosBluetooth(): stopping TelemetryReader");
 143                         mTelemetryReader.interrupt();
 144                         try {
 145                                 mTelemetryReader.join();
 146                         } catch (InterruptedException e) {
 147                         }
 148                         mTelemetryReader = null;
 149                 }
 150                 if (mAltosBluetooth != null) {
 151                         if (D) Log.d(TAG, "stopAltosBluetooth(): stopping AltosBluetooth");
 152                         mAltosBluetooth.close();
 153                         mAltosBluetooth = null;
 154                 }
 155                 device = null;
 156         }
 157
 158         private void startAltosBluetooth() {
 159                 if (mAltosBluetooth == null) {
 160                         if (D) Log.d(TAG, String.format("startAltosBluetooth(): Connecting to %s (%s)", device.getName(), device.getAddress()));
 161                         mAltosBluetooth = new AltosBluetooth(device, mHandler);
 162                         setState(STATE_CONNECTING);
 163                 } else {
 164                         // This is a bit of a hack - if it appears we're still connected, we treat this as a restart.
 165                         // So, to give a suitable delay to teardown/bringup, we just schedule a resend of a message
 166                         // to ourselves in a few seconds time that will ultimately call this method again.
 167                         // ... then we tear down the existing connection.
 168                         // We do it this way around so that we don't lose a reference to the device when this method
 169                         // is called on reception of MSG_CONNECT_FAILED in the handler above.
 170                         mHandler.sendMessageDelayed(Message.obtain(null, MSG_CONNECT, device), 3000);
 171                         stopAltosBluetooth();
 172                 }
 173         }
 174
 175         private synchronized void setState(int s) {
 176                 if (D) Log.d(TAG, "setState(): " + state + " -> " + s);
 177                 state = s;
 178
 179                 sendMessageToClients(Message.obtain(null, AltosDroid.MSG_STATE_CHANGE, state, -1));
 180         }
 181
 182         private void connected() {
 183                 sendMessageToClients(Message.obtain(null, AltosDroid.MSG_DEVNAME, device.getName()));
 184                 setState(STATE_CONNECTED);
 185                 try {
 186                         sendMessageToClients(Message.obtain(null, AltosDroid.MSG_DEVCONFIG, mAltosBluetooth.config_data()));
 187                 } catch (InterruptedException e) {
 188                 } catch (TimeoutException e) {
 189                 }
 190                 mTelemetryReader = new TelemetryReader(mAltosBluetooth, mHandler);
 191                 mTelemetryReader.start();
 192         }
 193
 194
 195         @Override
 196         public void onCreate() {
 197                 // Create a reference to the NotificationManager so that we can update our notifcation text later
 198                 //mNM = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);
 199
 200                 setState(STATE_READY);
 201         }
 202
 203         @Override
 204         public int onStartCommand(Intent intent, int flags, int startId) {
 205                 Log.i("TelemetryService", "Received start id " + startId + ": " + intent);
 206
 207                 CharSequence text = getText(R.string.telemetry_service_started);
 208
 209                 // Create notification to be displayed while the service runs
 210                 Notification notification = new Notification(R.drawable.am_status_c, text, 0);
 211
 212                 // The PendingIntent to launch our activity if the user selects this notification
 213                 PendingIntent contentIntent = PendingIntent.getActivity(this, 0,
 214                                 new Intent(this, AltosDroid.class), 0);
 215
 216                 // Set the info for the views that show in the notification panel.
 217                 notification.setLatestEventInfo(this, getText(R.string.telemetry_service_label), text, contentIntent);
 218
 219                 // Set the notification to be in the "Ongoing" section.
 220                 notification.flags |= Notification.FLAG_ONGOING_EVENT;
 221
 222                 // Move us into the foreground.
 223                 startForeground(NOTIFICATION, notification);
 224
 225                 // We want this service to continue running until it is explicitly
 226                 // stopped, so return sticky.
 227                 return START_STICKY;
 228         }
 229
 230         @Override
 231         public void onDestroy() {
 232
 233                 // Stop the bluetooth Comms threads
 234                 stopAltosBluetooth();
 235
 236                 // Demote us from the foreground, and cancel the persistent notification.
 237                 stopForeground(true);
 238
 239                 // Tell the user we stopped.
 240                 Toast.makeText(this, R.string.telemetry_service_stopped, Toast.LENGTH_SHORT).show();
 241         }
 242
 243         @Override
 244         public IBinder onBind(Intent intent) {
 245                 return mMessenger.getBinder();
 246         }
 247
 248
 249 }