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/*
* Copyright © 2012 Mike Beattie <mike@ethernal.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
package org.altusmetrum.AltosDroid;
import java.lang.ref.WeakReference;
import java.util.ArrayList;
import java.util.concurrent.TimeoutException;
import android.app.Notification;
//import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.Service;
import android.bluetooth.BluetoothDevice;
import android.content.Intent;
//import android.os.Bundle;
import android.os.IBinder;
import android.os.Handler;
import android.os.Message;
import android.os.Messenger;
import android.os.RemoteException;
import android.util.Log;
import android.widget.Toast;
//import org.altusmetrum.AltosLib.*;
public class TelemetryService extends Service {
private static final String TAG = "TelemetryService";
private static final boolean D = true;
static final int MSG_REGISTER_CLIENT = 1;
static final int MSG_UNREGISTER_CLIENT = 2;
static final int MSG_CONNECT = 3;
static final int MSG_CONNECTED = 4;
static final int MSG_CONNECT_FAILED = 5;
static final int MSG_DISCONNECTED = 6;
static final int MSG_TELEMETRY = 7;
public static final int STATE_NONE = 0;
public static final int STATE_READY = 1;
public static final int STATE_CONNECTING = 2;
public static final int STATE_CONNECTED = 3;
// Unique Identification Number for the Notification.
// We use it on Notification start, and to cancel it.
private int NOTIFICATION = R.string.telemetry_service_label;
//private NotificationManager mNM;
ArrayList<Messenger> mClients = new ArrayList<Messenger>(); // Keeps track of all current registered clients.
final Handler mHandler = new IncomingHandler(this);
final Messenger mMessenger = new Messenger(mHandler); // Target we publish for clients to send messages to IncomingHandler.
// Name of the connected device
private BluetoothDevice device = null;
private AltosBluetooth mAltosBluetooth = null;
private TelemetryReader mTelemetryReader = null;
// internally track state of bluetooth connection
private int state = STATE_NONE;
// Handler of incoming messages from clients.
static class IncomingHandler extends Handler {
private final WeakReference<TelemetryService> service;
IncomingHandler(TelemetryService s) { service = new WeakReference<TelemetryService>(s); }
@Override
public void handleMessage(Message msg) {
TelemetryService s = service.get();
switch (msg.what) {
case MSG_REGISTER_CLIENT:
s.mClients.add(msg.replyTo);
try {
msg.replyTo.send(Message.obtain(null, AltosDroid.MSG_DEVNAME, s.device.getName()));
msg.replyTo.send(Message.obtain(null, AltosDroid.MSG_STATE_CHANGE, s.state, -1));
} catch (RemoteException e) {
s.mClients.remove(msg.replyTo);
}
if (D) Log.d(TAG, "Client bound to service");
break;
case MSG_UNREGISTER_CLIENT:
s.mClients.remove(msg.replyTo);
if (D) Log.d(TAG, "Client unbound from service");
break;
case MSG_CONNECT:
if (D) Log.d(TAG, "Connect command received");
s.device = (BluetoothDevice) msg.obj;
s.startAltosBluetooth();
break;
case MSG_CONNECTED:
if (D) Log.d(TAG, "Connected to device");
s.connected();
break;
case MSG_CONNECT_FAILED:
if (D) Log.d(TAG, "Connection failed... retrying");
s.startAltosBluetooth();
break;
case MSG_DISCONNECTED:
// Only do the following if we haven't been shutdown elsewhere..
if (s.device != null) {
if (D) Log.d(TAG, "Disconnected from " + s.device.getName());
s.stopAltosBluetooth();
}
break;
case MSG_TELEMETRY:
s.sendMessageToClients(Message.obtain(null, AltosDroid.MSG_TELEMETRY, msg.obj));
break;
default:
super.handleMessage(msg);
}
}
}
private void sendMessageToClients(Message m) {
for (int i=mClients.size()-1; i>=0; i--) {
try {
mClients.get(i).send(m);
} catch (RemoteException e) {
mClients.remove(i);
}
}
}
private void stopAltosBluetooth() {
if (D) Log.d(TAG, "stopAltosBluetooth(): begin");
setState(STATE_READY);
if (mTelemetryReader != null) {
if (D) Log.d(TAG, "stopAltosBluetooth(): stopping TelemetryReader");
mTelemetryReader.interrupt();
try {
mTelemetryReader.join();
} catch (InterruptedException e) {
}
mTelemetryReader = null;
}
if (mAltosBluetooth != null) {
if (D) Log.d(TAG, "stopAltosBluetooth(): stopping AltosBluetooth");
mAltosBluetooth.close();
mAltosBluetooth = null;
}
device = null;
}
private void startAltosBluetooth() {
if (mAltosBluetooth == null) {
if (D) Log.d(TAG, String.format("startAltosBluetooth(): Connecting to %s (%s)", device.getName(), device.getAddress()));
mAltosBluetooth = new AltosBluetooth(device, mHandler);
setState(STATE_CONNECTING);
} else {
// This is a bit of a hack - if it appears we're still connected, we treat this as a restart.
// So, to give a suitable delay to teardown/bringup, we just schedule a resend of a message
// to ourselves in a few seconds time that will ultimately call this method again.
// ... then we tear down the existing connection.
// We do it this way around so that we don't lose a reference to the device when this method
// is called on reception of MSG_CONNECT_FAILED in the handler above.
mHandler.sendMessageDelayed(Message.obtain(null, MSG_CONNECT, device), 3000);
stopAltosBluetooth();
}
}
private synchronized void setState(int s) {
if (D) Log.d(TAG, "setState(): " + state + " -> " + s);
state = s;
sendMessageToClients(Message.obtain(null, AltosDroid.MSG_STATE_CHANGE, state, -1));
}
private void connected() {
sendMessageToClients(Message.obtain(null, AltosDroid.MSG_DEVNAME, device.getName()));
setState(STATE_CONNECTED);
try {
sendMessageToClients(Message.obtain(null, AltosDroid.MSG_DEVCONFIG, mAltosBluetooth.config_data()));
} catch (InterruptedException e) {
} catch (TimeoutException e) {
}
mTelemetryReader = new TelemetryReader(mAltosBluetooth, mHandler);
mTelemetryReader.start();
}
@Override
public void onCreate() {
// Create a reference to the NotificationManager so that we can update our notifcation text later
//mNM = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);
setState(STATE_READY);
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
Log.i("TelemetryService", "Received start id " + startId + ": " + intent);
CharSequence text = getText(R.string.telemetry_service_started);
// Create notification to be displayed while the service runs
Notification notification = new Notification(R.drawable.am_status_c, text, 0);
// The PendingIntent to launch our activity if the user selects this notification
PendingIntent contentIntent = PendingIntent.getActivity(this, 0,
new Intent(this, AltosDroid.class), 0);
// Set the info for the views that show in the notification panel.
notification.setLatestEventInfo(this, getText(R.string.telemetry_service_label), text, contentIntent);
// Set the notification to be in the "Ongoing" section.
notification.flags |= Notification.FLAG_ONGOING_EVENT;
// Move us into the foreground.
startForeground(NOTIFICATION, notification);
// We want this service to continue running until it is explicitly
// stopped, so return sticky.
return START_STICKY;
}
@Override
public void onDestroy() {
// Stop the bluetooth Comms threads
stopAltosBluetooth();
// Demote us from the foreground, and cancel the persistent notification.
stopForeground(true);
// Tell the user we stopped.
Toast.makeText(this, R.string.telemetry_service_stopped, Toast.LENGTH_SHORT).show();
}
@Override
public IBinder onBind(Intent intent) {
return mMessenger.getBinder();
}
}
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