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 import java.util.Timer;
  24 import java.util.TimerTask;
  25
  26 import android.app.Notification;
  27 //import android.app.NotificationManager;
  28 import android.app.PendingIntent;
  29 import android.app.Service;
  30 import android.bluetooth.BluetoothDevice;
  31 import android.content.Intent;
  32 import android.content.Context;
  33 import android.os.Bundle;
  34 import android.os.IBinder;
  35 import android.os.Handler;
  36 import android.os.Message;
  37 import android.os.Messenger;
  38 import android.os.RemoteException;
  39 import android.util.Log;
  40 import android.widget.Toast;
  41 import android.location.Location;
  42 import android.location.LocationManager;
  43 import android.location.LocationListener;
  44
  45 import org.altusmetrum.altoslib_1.*;
  46
  47 class AltosLocationListener implements LocationListener {
  48         boolean fine;
  49
  50         public void onLocationChanged(Location location) {
  51         }
  52
  53         public void onStatusChanged(String provider, int status, Bundle extras) {
  54         }
  55
  56         public void onProviderEnabled(String provider) {
  57         }
  58
  59         public void onProviderDisabled(String provider) {
  60         }
  61
  62         public AltosLocationListener(boolean fine) {
  63                 this.fine = fine;
  64         }
  65 }
  66
  67 public class TelemetryService extends Service {
  68
  69         private static final String TAG = "TelemetryService";
  70         private static final boolean D = true;
  71
  72         static final int MSG_REGISTER_CLIENT   = 1;
  73         static final int MSG_UNREGISTER_CLIENT = 2;
  74         static final int MSG_CONNECT           = 3;
  75         static final int MSG_CONNECTED         = 4;
  76         static final int MSG_CONNECT_FAILED    = 5;
  77         static final int MSG_DISCONNECTED      = 6;
  78         static final int MSG_TELEMETRY         = 7;
  79         static final int MSG_SETFREQUENCY      = 8;
  80
  81         public static final int STATE_NONE       = 0;
  82         public static final int STATE_READY      = 1;
  83         public static final int STATE_CONNECTING = 2;
  84         public static final int STATE_CONNECTED  = 3;
  85
  86         // Unique Identification Number for the Notification.
  87         // We use it on Notification start, and to cancel it.
  88         private int NOTIFICATION = R.string.telemetry_service_label;
  89         //private NotificationManager mNM;
  90
  91         // Timer - we wake up every now and then to decide if the service should stop
  92         private Timer timer = new Timer();
  93
  94         ArrayList<Messenger> mClients = new ArrayList<Messenger>(); // Keeps track of all current registered clients.
  95         final Handler   mHandler   = new IncomingHandler(this);
  96         final Messenger mMessenger = new Messenger(mHandler); // Target we publish for clients to send messages to IncomingHandler.
  97
  98         // Name of the connected device
  99         private BluetoothDevice device           = null;
 100         private AltosBluetooth  mAltosBluetooth  = null;
 101         private AltosConfigData mConfigData      = null;
 102         private TelemetryReader mTelemetryReader = null;
 103         private TelemetryLogger mTelemetryLogger = null;
 104
 105         // internally track state of bluetooth connection
 106         private int state = STATE_NONE;
 107
 108         // location listeners
 109
 110         private AltosLocationListener gpsListener;
 111         private AltosLocationListener netListener;
 112
 113         // Handler of incoming messages from clients.
 114         static class IncomingHandler extends Handler {
 115                 private final WeakReference<TelemetryService> service;
 116                 IncomingHandler(TelemetryService s) { service = new WeakReference<TelemetryService>(s); }
 117
 118                 @Override
 119                 public void handleMessage(Message msg) {
 120                         TelemetryService s = service.get();
 121                         switch (msg.what) {
 122                         case MSG_REGISTER_CLIENT:
 123                                 s.mClients.add(msg.replyTo);
 124                                 try {
 125                                         // Now we try to send the freshly connected UI any relavant information about what
 126                                         // we're talking to - Basically state and Config Data.
 127                                         msg.replyTo.send(Message.obtain(null, AltosDroid.MSG_STATE_CHANGE, s.state, -1, s.mConfigData));
 128                                 } catch (RemoteException e) {
 129                                         s.mClients.remove(msg.replyTo);
 130                                 }
 131                                 if (D) Log.d(TAG, "Client bound to service");
 132                                 break;
 133                         case MSG_UNREGISTER_CLIENT:
 134                                 s.mClients.remove(msg.replyTo);
 135                                 if (D) Log.d(TAG, "Client unbound from service");
 136                                 break;
 137                         case MSG_CONNECT:
 138                                 if (D) Log.d(TAG, "Connect command received");
 139                                 s.device = (BluetoothDevice) msg.obj;
 140                                 s.startAltosBluetooth();
 141                                 break;
 142                         case MSG_CONNECTED:
 143                                 if (D) Log.d(TAG, "Connected to device");
 144                                 s.connected();
 145                                 break;
 146                         case MSG_CONNECT_FAILED:
 147                                 if (D) Log.d(TAG, "Connection failed... retrying");
 148                                 s.startAltosBluetooth();
 149                                 break;
 150                         case MSG_DISCONNECTED:
 151                                 // Only do the following if we haven't been shutdown elsewhere..
 152                                 if (s.device != null) {
 153                                         if (D) Log.d(TAG, "Disconnected from " + s.device.getName());
 154                                         s.stopAltosBluetooth();
 155                                 }
 156                                 break;
 157                         case MSG_TELEMETRY:
 158                                 s.sendMessageToClients(Message.obtain(null, AltosDroid.MSG_TELEMETRY, msg.obj));
 159                                 break;
 160                         case MSG_SETFREQUENCY:
 161                                 if (s.state == STATE_CONNECTED) {
 162                                         try {
 163                                                 s.mAltosBluetooth.set_radio_frequency((Double) msg.obj);
 164                                         } catch (InterruptedException e) {
 165                                         } catch (TimeoutException e) {
 166                                         }
 167                                 }
 168                                 break;
 169                         default:
 170                                 super.handleMessage(msg);
 171                         }
 172                 }
 173         }
 174
 175         private void sendMessageToClients(Message m) {
 176                 for (int i=mClients.size()-1; i>=0; i--) {
 177                         try {
 178                                 mClients.get(i).send(m);
 179                         } catch (RemoteException e) {
 180                                 mClients.remove(i);
 181                         }
 182                 }
 183         }
 184
 185         private void stopAltosBluetooth() {
 186                 if (D) Log.d(TAG, "stopAltosBluetooth(): begin");
 187                 setState(STATE_READY);
 188                 if (mTelemetryReader != null) {
 189                         if (D) Log.d(TAG, "stopAltosBluetooth(): stopping TelemetryReader");
 190                         mTelemetryReader.interrupt();
 191                         try {
 192                                 mTelemetryReader.join();
 193                         } catch (InterruptedException e) {
 194                         }
 195                         mTelemetryReader = null;
 196                 }
 197                 if (mTelemetryLogger != null) {
 198                         if (D) Log.d(TAG, "stopAltosBluetooth(): stopping TelemetryLogger");
 199                         mTelemetryLogger.stop();
 200                         mTelemetryLogger = null;
 201                 }
 202                 if (mAltosBluetooth != null) {
 203                         if (D) Log.d(TAG, "stopAltosBluetooth(): stopping AltosBluetooth");
 204                         mAltosBluetooth.close();
 205                         mAltosBluetooth = null;
 206                 }
 207                 device = null;
 208                 mConfigData = null;
 209         }
 210
 211         private void startAltosBluetooth() {
 212                 if (mAltosBluetooth == null) {
 213                         if (D) Log.d(TAG, String.format("startAltosBluetooth(): Connecting to %s (%s)", device.getName(), device.getAddress()));
 214                         mAltosBluetooth = new AltosBluetooth(device, mHandler);
 215                         setState(STATE_CONNECTING);
 216                 } else {
 217                         // This is a bit of a hack - if it appears we're still connected, we treat this as a restart.
 218                         // So, to give a suitable delay to teardown/bringup, we just schedule a resend of a message
 219                         // to ourselves in a few seconds time that will ultimately call this method again.
 220                         // ... then we tear down the existing connection.
 221                         // We do it this way around so that we don't lose a reference to the device when this method
 222                         // is called on reception of MSG_CONNECT_FAILED in the handler above.
 223                         mHandler.sendMessageDelayed(Message.obtain(null, MSG_CONNECT, device), 3000);
 224                         stopAltosBluetooth();
 225                 }
 226         }
 227
 228         private synchronized void setState(int s) {
 229                 if (D) Log.d(TAG, "setState(): " + state + " -> " + s);
 230                 state = s;
 231
 232                 // This shouldn't be required - mConfigData should be null for any non-connected
 233                 // state, but to be safe and to reduce message size
 234                 AltosConfigData acd = (state == STATE_CONNECTED) ? mConfigData : null;
 235
 236                 sendMessageToClients(Message.obtain(null, AltosDroid.MSG_STATE_CHANGE, state, -1, acd));
 237         }
 238
 239         private void connected() {
 240                 try {
 241                         mConfigData = mAltosBluetooth.config_data();
 242                 } catch (InterruptedException e) {
 243                 } catch (TimeoutException e) {
 244                         // If this timed out, then we really want to retry it, but
 245                         // probably safer to just retry the connection from scratch.
 246                         mHandler.obtainMessage(MSG_CONNECT_FAILED).sendToTarget();
 247                         return;
 248                 }
 249
 250                 setState(STATE_CONNECTED);
 251
 252                 mTelemetryReader = new TelemetryReader(mAltosBluetooth, mHandler);
 253                 mTelemetryReader.start();
 254
 255                 mTelemetryLogger = new TelemetryLogger(this, mAltosBluetooth);
 256         }
 257
 258
 259         private void onTimerTick() {
 260                 if (D) Log.d(TAG, "Timer wakeup");
 261                 try {
 262                         if (mClients.size() <= 0 && state != STATE_CONNECTED) {
 263                                 stopSelf();
 264                         }
 265                 } catch (Throwable t) {
 266                         Log.e(TAG, "Timer failed: ", t);
 267                 }
 268         }
 269
 270
 271         @Override
 272         public void onCreate() {
 273                 // Create a reference to the NotificationManager so that we can update our notifcation text later
 274                 //mNM = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);
 275
 276                 setState(STATE_READY);
 277
 278                 // Start our timer - first event in 10 seconds, then every 10 seconds after that.
 279                 timer.scheduleAtFixedRate(new TimerTask(){ public void run() {onTimerTick();}}, 10000L, 10000L);
 280
 281                 // Listen for GPS and Network position updates
 282                 gpsListener = new AltosLocationListener(true);
 283                 netListener = new AltosLocationListener(false);
 284
 285                 LocationManager locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
 286
 287                 locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, gpsListener);
 288                 locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, netListener);
 289         }
 290
 291         @Override
 292         public int onStartCommand(Intent intent, int flags, int startId) {
 293                 Log.i("TelemetryService", "Received start id " + startId + ": " + intent);
 294
 295                 CharSequence text = getText(R.string.telemetry_service_started);
 296
 297                 // Create notification to be displayed while the service runs
 298                 Notification notification = new Notification(R.drawable.am_status_c, text, 0);
 299
 300                 // The PendingIntent to launch our activity if the user selects this notification
 301                 PendingIntent contentIntent = PendingIntent.getActivity(this, 0,
 302                                 new Intent(this, AltosDroid.class), 0);
 303
 304                 // Set the info for the views that show in the notification panel.
 305                 notification.setLatestEventInfo(this, getText(R.string.telemetry_service_label), text, contentIntent);
 306
 307                 // Set the notification to be in the "Ongoing" section.
 308                 notification.flags |= Notification.FLAG_ONGOING_EVENT;
 309
 310                 // Move us into the foreground.
 311                 startForeground(NOTIFICATION, notification);
 312
 313                 // We want this service to continue running until it is explicitly
 314                 // stopped, so return sticky.
 315                 return START_STICKY;
 316         }
 317
 318         @Override
 319         public void onDestroy() {
 320
 321                 // Stop listening for location updates
 322                 LocationManager locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
 323                 locationManager.removeUpdates(gpsListener);
 324                 locationManager.removeUpdates(netListener);
 325
 326                 // Stop the bluetooth Comms threads
 327                 stopAltosBluetooth();
 328
 329                 // Demote us from the foreground, and cancel the persistent notification.
 330                 stopForeground(true);
 331
 332                 // Stop our timer
 333                 if (timer != null) {timer.cancel();}
 334
 335                 // Tell the user we stopped.
 336                 Toast.makeText(this, R.string.telemetry_service_stopped, Toast.LENGTH_SHORT).show();
 337         }
 338
 339         @Override
 340         public IBinder onBind(Intent intent) {
 341                 return mMessenger.getBinder();
 342         }
 343
 344
 345 }