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