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         Handler handler;
  49
  50         public void onLocationChanged(Location location) {
  51                 handler.obtainMessage(TelemetryService.MSG_LOCATION, location).sendToTarget();
  52         }
  53
  54         public void onStatusChanged(String provider, int status, Bundle extras) {
  55         }
  56
  57         public void onProviderEnabled(String provider) {
  58         }
  59
  60         public void onProviderDisabled(String provider) {
  61         }
  62
  63         public AltosLocationListener(Handler handler) {
  64                 this.handler = handler;
  65         }
  66 }
  67
  68 public class TelemetryService extends Service {
  69
  70         private static final String TAG = "TelemetryService";
  71         private static final boolean D = true;
  72
  73         static final int MSG_REGISTER_CLIENT   = 1;
  74         static final int MSG_UNREGISTER_CLIENT = 2;
  75         static final int MSG_CONNECT           = 3;
  76         static final int MSG_CONNECTED         = 4;
  77         static final int MSG_CONNECT_FAILED    = 5;
  78         static final int MSG_DISCONNECTED      = 6;
  79         static final int MSG_TELEMETRY         = 7;
  80         static final int MSG_SETFREQUENCY      = 8;
  81         static final int MSG_LOCATION          = 9;
  82         static final int MSG_CRC_ERROR         = 10;
  83
  84         public static final int STATE_NONE       = 0;
  85         public static final int STATE_READY      = 1;
  86         public static final int STATE_CONNECTING = 2;
  87         public static final int STATE_CONNECTED  = 3;
  88
  89         // Unique Identification Number for the Notification.
  90         // We use it on Notification start, and to cancel it.
  91         private int NOTIFICATION = R.string.telemetry_service_label;
  92         //private NotificationManager mNM;
  93
  94         // Timer - we wake up every now and then to decide if the service should stop
  95         private Timer timer = new Timer();
  96
  97         ArrayList<Messenger> mClients = new ArrayList<Messenger>(); // Keeps track of all current registered clients.
  98         final Handler   mHandler   = new IncomingHandler(this);
  99         final Messenger mMessenger = new Messenger(mHandler); // Target we publish for clients to send messages to IncomingHandler.
 100
 101         // Name of the connected device
 102         private BluetoothDevice device           = null;
 103         private AltosBluetooth  mAltosBluetooth  = null;
 104         private AltosConfigData mConfigData      = null;
 105         private TelemetryReader mTelemetryReader = null;
 106         private TelemetryLogger mTelemetryLogger = null;
 107
 108         // internally track state of bluetooth connection
 109         private int state = STATE_NONE;
 110
 111         // location listeners
 112
 113         private AltosLocationListener locationListener;
 114
 115         // Last data seen; send to UI when it starts
 116
 117         private AltosState last_state;
 118         private Location last_location;
 119         private int last_crc_errors;
 120
 121         // Handler of incoming messages from clients.
 122         static class IncomingHandler extends Handler {
 123                 private final WeakReference<TelemetryService> service;
 124                 IncomingHandler(TelemetryService s) { service = new WeakReference<TelemetryService>(s); }
 125
 126                 @Override
 127                 public void handleMessage(Message msg) {
 128                         TelemetryService s = service.get();
 129                         switch (msg.what) {
 130                         case MSG_REGISTER_CLIENT:
 131                                 s.mClients.add(msg.replyTo);
 132                                 try {
 133                                         // Now we try to send the freshly connected UI any relavant information about what
 134                                         // we're talking to - Basically state and Config Data.
 135                                         msg.replyTo.send(Message.obtain(null, AltosDroid.MSG_STATE_CHANGE, s.state, -1, s.mConfigData));
 136                                 } catch (RemoteException e) {
 137                                         s.mClients.remove(msg.replyTo);
 138                                 }
 139                                 if (D) Log.d(TAG, "Client bound to service");
 140                                 if (s.last_state != null)
 141                                         s.sendTelemetry(s.last_state);
 142                                 if (s.last_location != null)
 143                                         s.sendLocation(s.last_location);
 144                                 if (s.last_crc_errors != 0)
 145                                         s.sendCrcErrors(s.last_crc_errors);
 146                                 break;
 147                         case MSG_UNREGISTER_CLIENT:
 148                                 s.mClients.remove(msg.replyTo);
 149                                 if (D) Log.d(TAG, "Client unbound from service");
 150                                 break;
 151                         case MSG_CONNECT:
 152                                 if (D) Log.d(TAG, "Connect command received");
 153                                 s.device = (BluetoothDevice) msg.obj;
 154                                 s.startAltosBluetooth();
 155                                 break;
 156                         case MSG_CONNECTED:
 157                                 if (D) Log.d(TAG, "Connected to device");
 158                                 s.connected();
 159                                 break;
 160                         case MSG_CONNECT_FAILED:
 161                                 if (D) Log.d(TAG, "Connection failed... retrying");
 162                                 s.startAltosBluetooth();
 163                                 break;
 164                         case MSG_DISCONNECTED:
 165                                 // Only do the following if we haven't been shutdown elsewhere..
 166                                 if (s.device != null) {
 167                                         if (D) Log.d(TAG, "Disconnected from " + s.device.getName());
 168                                         s.stopAltosBluetooth();
 169                                 }
 170                                 break;
 171                         case MSG_TELEMETRY:
 172                                 // forward telemetry messages
 173                                 s.last_state = (AltosState) msg.obj;
 174                                 s.sendMessageToClients(Message.obtain(null, AltosDroid.MSG_TELEMETRY, msg.obj));
 175                                 break;
 176                         case MSG_LOCATION:
 177                                 // forward location messages
 178                                 s.last_location = (Location) msg.obj;
 179                                 s.sendMessageToClients(Message.obtain(null, AltosDroid.MSG_LOCATION, msg.obj));
 180                                 break;
 181                         case MSG_CRC_ERROR:
 182                                 // forward crc error messages
 183                                 s.last_crc_errors = (Integer) msg.obj;
 184                                 s.sendMessageToClients(Message.obtain(null, AltosDroid.MSG_CRC_ERROR, msg.obj));
 185                                 break;
 186                         case MSG_SETFREQUENCY:
 187                                 if (s.state == STATE_CONNECTED) {
 188                                         try {
 189                                                 s.mAltosBluetooth.set_radio_frequency((Double) msg.obj);
 190                                         } catch (InterruptedException e) {
 191                                         } catch (TimeoutException e) {
 192                                         }
 193                                 }
 194                                 break;
 195                         default:
 196                                 super.handleMessage(msg);
 197                         }
 198                 }
 199         }
 200
 201         public void sendTelemetry(AltosState state) {
 202         }
 203
 204         public void sendLocation(Location location) {
 205                 mHandler.obtainMessage(MSG_LOCATION, location).sendToTarget();
 206         }
 207
 208         public void sendCrcErrors(int crc_errors) {
 209         }
 210
 211         private void sendMessageToClients(Message m) {
 212                 for (int i=mClients.size()-1; i>=0; i--) {
 213                         try {
 214                                 mClients.get(i).send(m);
 215                         } catch (RemoteException e) {
 216                                 mClients.remove(i);
 217                         }
 218                 }
 219         }
 220
 221         private void stopAltosBluetooth() {
 222                 if (D) Log.d(TAG, "stopAltosBluetooth(): begin");
 223                 setState(STATE_READY);
 224                 if (mTelemetryReader != null) {
 225                         if (D) Log.d(TAG, "stopAltosBluetooth(): stopping TelemetryReader");
 226                         mTelemetryReader.interrupt();
 227                         try {
 228                                 mTelemetryReader.join();
 229                         } catch (InterruptedException e) {
 230                         }
 231                         mTelemetryReader = null;
 232                 }
 233                 if (mTelemetryLogger != null) {
 234                         if (D) Log.d(TAG, "stopAltosBluetooth(): stopping TelemetryLogger");
 235                         mTelemetryLogger.stop();
 236                         mTelemetryLogger = null;
 237                 }
 238                 if (mAltosBluetooth != null) {
 239                         if (D) Log.d(TAG, "stopAltosBluetooth(): stopping AltosBluetooth");
 240                         mAltosBluetooth.close();
 241                         mAltosBluetooth = null;
 242                 }
 243                 device = null;
 244                 mConfigData = null;
 245         }
 246
 247         private void startAltosBluetooth() {
 248                 if (mAltosBluetooth == null) {
 249                         if (D) Log.d(TAG, String.format("startAltosBluetooth(): Connecting to %s (%s)", device.getName(), device.getAddress()));
 250                         mAltosBluetooth = new AltosBluetooth(device, mHandler);
 251                         setState(STATE_CONNECTING);
 252                 } else {
 253                         // This is a bit of a hack - if it appears we're still connected, we treat this as a restart.
 254                         // So, to give a suitable delay to teardown/bringup, we just schedule a resend of a message
 255                         // to ourselves in a few seconds time that will ultimately call this method again.
 256                         // ... then we tear down the existing connection.
 257                         // We do it this way around so that we don't lose a reference to the device when this method
 258                         // is called on reception of MSG_CONNECT_FAILED in the handler above.
 259                         mHandler.sendMessageDelayed(Message.obtain(null, MSG_CONNECT, device), 3000);
 260                         stopAltosBluetooth();
 261                 }
 262         }
 263
 264         private synchronized void setState(int s) {
 265                 if (D) Log.d(TAG, "setState(): " + state + " -> " + s);
 266                 state = s;
 267
 268                 // This shouldn't be required - mConfigData should be null for any non-connected
 269                 // state, but to be safe and to reduce message size
 270                 AltosConfigData acd = (state == STATE_CONNECTED) ? mConfigData : null;
 271
 272                 sendMessageToClients(Message.obtain(null, AltosDroid.MSG_STATE_CHANGE, state, -1, acd));
 273         }
 274
 275         private void connected() {
 276                 try {
 277                         mConfigData = mAltosBluetooth.config_data();
 278                 } catch (InterruptedException e) {
 279                 } catch (TimeoutException e) {
 280                         // If this timed out, then we really want to retry it, but
 281                         // probably safer to just retry the connection from scratch.
 282                         mHandler.obtainMessage(MSG_CONNECT_FAILED).sendToTarget();
 283                         return;
 284                 }
 285
 286                 setState(STATE_CONNECTED);
 287
 288                 mTelemetryReader = new TelemetryReader(mAltosBluetooth, mHandler);
 289                 mTelemetryReader.start();
 290
 291                 mTelemetryLogger = new TelemetryLogger(this, mAltosBluetooth);
 292         }
 293
 294
 295         private void onTimerTick() {
 296                 if (D) Log.d(TAG, "Timer wakeup");
 297                 try {
 298                         if (mClients.size() <= 0 && state != STATE_CONNECTED) {
 299                                 stopSelf();
 300                         }
 301                 } catch (Throwable t) {
 302                         Log.e(TAG, "Timer failed: ", t);
 303                 }
 304         }
 305
 306
 307         @Override
 308         public void onCreate() {
 309                 // Create a reference to the NotificationManager so that we can update our notifcation text later
 310                 //mNM = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);
 311
 312                 setState(STATE_READY);
 313
 314                 // Start our timer - first event in 10 seconds, then every 10 seconds after that.
 315                 timer.scheduleAtFixedRate(new TimerTask(){ public void run() {onTimerTick();}}, 10000L, 10000L);
 316
 317                 // Listen for GPS and Network position updates
 318                 locationListener = new AltosLocationListener(mHandler);
 319
 320                 LocationManager locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
 321
 322                 locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);
 323                 locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locationListener);
 324         }
 325
 326         @Override
 327         public int onStartCommand(Intent intent, int flags, int startId) {
 328                 Log.i("TelemetryService", "Received start id " + startId + ": " + intent);
 329
 330                 CharSequence text = getText(R.string.telemetry_service_started);
 331
 332                 // Create notification to be displayed while the service runs
 333                 Notification notification = new Notification(R.drawable.am_status_c, text, 0);
 334
 335                 // The PendingIntent to launch our activity if the user selects this notification
 336                 PendingIntent contentIntent = PendingIntent.getActivity(this, 0,
 337                                 new Intent(this, AltosDroid.class), 0);
 338
 339                 // Set the info for the views that show in the notification panel.
 340                 notification.setLatestEventInfo(this, getText(R.string.telemetry_service_label), text, contentIntent);
 341
 342                 // Set the notification to be in the "Ongoing" section.
 343                 notification.flags |= Notification.FLAG_ONGOING_EVENT;
 344
 345                 // Move us into the foreground.
 346                 startForeground(NOTIFICATION, notification);
 347
 348                 // We want this service to continue running until it is explicitly
 349                 // stopped, so return sticky.
 350                 return START_STICKY;
 351         }
 352
 353         @Override
 354         public void onDestroy() {
 355
 356                 // Stop listening for location updates
 357                 LocationManager locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
 358                 locationManager.removeUpdates(locationListener);
 359
 360                 // Stop the bluetooth Comms threads
 361                 stopAltosBluetooth();
 362
 363                 // Demote us from the foreground, and cancel the persistent notification.
 364                 stopForeground(true);
 365
 366                 // Stop our timer
 367                 if (timer != null) {timer.cancel();}
 368
 369                 // Tell the user we stopped.
 370                 Toast.makeText(this, R.string.telemetry_service_stopped, Toast.LENGTH_SHORT).show();
 371         }
 372
 373         @Override
 374         public IBinder onBind(Intent intent) {
 375                 return mMessenger.getBinder();
 376         }
 377
 378
 379 }