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   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.LinkedBlockingQueue;
  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
  53         public static final int STATE_NONE       = 0;
  54         public static final int STATE_READY      = 1;
  55         public static final int STATE_CONNECTING = 2;
  56         public static final int STATE_CONNECTED  = 3;
  57
  58         // Unique Identification Number for the Notification.
  59         // We use it on Notification start, and to cancel it.
  60         private int NOTIFICATION = R.string.telemetry_service_label;
  61         //private NotificationManager mNM;
  62
  63         ArrayList<Messenger> mClients = new ArrayList<Messenger>(); // Keeps track of all current registered clients.
  64         final Handler   mHandler   = new IncomingHandler(this);
  65         final Messenger mMessenger = new Messenger(mHandler); // Target we publish for clients to send messages to IncomingHandler.
  66
  67         // Name of the connected device
  68         private BluetoothDevice device = null;
  69         private AltosBluetooth mAltosBluetooth = null;
  70         private int state = STATE_NONE;
  71         LinkedBlockingQueue<AltosLine> telem;
  72
  73         // Handler of incoming messages from clients.
  74         static class IncomingHandler extends Handler {
  75                 private final WeakReference<TelemetryService> service;
  76                 IncomingHandler(TelemetryService s) { service = new WeakReference<TelemetryService>(s); }
  77
  78                 @Override
  79                 public void handleMessage(Message msg) {
  80                         TelemetryService s = service.get();
  81                         switch (msg.what) {
  82                         case MSG_REGISTER_CLIENT:
  83                                 s.mClients.add(msg.replyTo);
  84                                 try {
  85                                         msg.replyTo.send(Message.obtain(null, AltosDroid.MSG_STATE_CHANGE, s.state, -1));
  86                                 } catch (RemoteException e) {
  87                                         s.mClients.remove(msg.replyTo);
  88                                 }
  89                                 if (D) Log.d(TAG, "Client bound to service");
  90                                 break;
  91                         case MSG_UNREGISTER_CLIENT:
  92                                 s.mClients.remove(msg.replyTo);
  93                                 if (D) Log.d(TAG, "Client unbound from service");
  94                                 break;
  95                         case MSG_CONNECT:
  96                                 if (D) Log.d(TAG, "Connect command received");
  97                                 s.device = (BluetoothDevice) msg.obj;
  98                                 s.startAltosBluetooth();
  99                                 break;
 100                         case MSG_CONNECTED:
 101                                 if (D) Log.d(TAG, "Connected to device");
 102                                 s.sendMessageToClients(Message.obtain(null, AltosDroid.MSG_DEVNAME, s.device.getName()));
 103                                 s.setState(STATE_CONNECTED);
 104                                 s.mAltosBluetooth.add_monitor(s.telem);
 105                                 break;
 106                         case MSG_CONNECT_FAILED:
 107                                 if (D) Log.d(TAG, "Connection failed... retrying");
 108                                 s.startAltosBluetooth();
 109                                 break;
 110                         case MSG_DISCONNECTED:
 111                                 if (D) Log.d(TAG, "Disconnected from " + s.device.getName());
 112                                 s.stopAltosBluetooth();
 113                                 break;
 114                         default:
 115                                 super.handleMessage(msg);
 116                         }
 117                 }
 118         }
 119
 120         private void sendMessageToClients(Message m) {
 121                 for (int i=mClients.size()-1; i>=0; i--) {
 122                         try {
 123                                 mClients.get(i).send(m);
 124                         } catch (RemoteException e) {
 125                                 mClients.remove(i);
 126                         }
 127                 }
 128         }
 129
 130         private void stopAltosBluetooth() {
 131                 if (D) Log.i(TAG, "Stopping BT");
 132                 setState(STATE_READY);
 133                 if (mAltosBluetooth != null) {
 134                         if (D) Log.i(TAG, "Closing AltosBluetooth");
 135                         mAltosBluetooth.close();
 136                         mAltosBluetooth = null;
 137                 }
 138                 device = null;
 139                 telem.clear();
 140         }
 141
 142         private void startAltosBluetooth() {
 143                 if (mAltosBluetooth == null) {
 144                         if (D) Log.i(TAG, "Connecting to " + device.getName());
 145                         mAltosBluetooth = new AltosBluetooth(device, mHandler);
 146                         setState(STATE_CONNECTING);
 147                 } else {
 148                         stopAltosBluetooth();
 149                         mHandler.sendMessageDelayed(Message.obtain(null, MSG_CONNECT, device), 1000);
 150                 }
 151         }
 152
 153         private synchronized void setState(int s) {
 154                 if (D) Log.d(TAG, "setState() " + state + " -> " + s);
 155                 state = s;
 156
 157                 sendMessageToClients(Message.obtain(null, AltosDroid.MSG_STATE_CHANGE, state, -1));
 158         }
 159
 160         @Override
 161         public void onCreate() {
 162                 // Create a reference to the NotificationManager so that we can update our notifcation text later
 163                 //mNM = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);
 164
 165                 telem = new LinkedBlockingQueue<AltosLine>();
 166                 setState(STATE_READY);
 167         }
 168
 169         @Override
 170         public int onStartCommand(Intent intent, int flags, int startId) {
 171                 Log.i("TelemetryService", "Received start id " + startId + ": " + intent);
 172
 173                 CharSequence text = getText(R.string.telemetry_service_started);
 174
 175                 // Create notification to be displayed while the service runs
 176                 Notification notification = new Notification(R.drawable.am_status_c, text, 0);
 177
 178                 // The PendingIntent to launch our activity if the user selects this notification
 179                 PendingIntent contentIntent = PendingIntent.getActivity(this, 0,
 180                                 new Intent(this, AltosDroid.class), 0);
 181
 182                 // Set the info for the views that show in the notification panel.
 183                 notification.setLatestEventInfo(this, getText(R.string.telemetry_service_label), text, contentIntent);
 184
 185                 // Set the notification to be in the "Ongoing" section.
 186                 notification.flags |= Notification.FLAG_ONGOING_EVENT;
 187
 188                 // Move us into the foreground.
 189                 startForeground(NOTIFICATION, notification);
 190
 191                 // We want this service to continue running until it is explicitly
 192                 // stopped, so return sticky.
 193                 return START_STICKY;
 194         }
 195
 196         @Override
 197         public void onDestroy() {
 198
 199                 // Stop the bluetooth Comms threads
 200                 stopAltosBluetooth();
 201
 202                 // Demote us from the foreground, and cancel the persistent notification.
 203                 stopForeground(true);
 204
 205                 // Tell the user we stopped.
 206                 Toast.makeText(this, R.string.telemetry_service_stopped, Toast.LENGTH_SHORT).show();
 207         }
 208
 209         @Override
 210         public IBinder onBind(Intent intent) {
 211                 return mMessenger.getBinder();
 212         }
 213
 214
 215 }