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