protected BTGPSLocationProvider() throws LocationException {
// TODO: Move this to searchConnect method?
// TODO: The problem here is that it searches every time. Slow. Need to try Properties?
// TODO: BIG ONE: Should only connect to GPS that isPaired() (from menu). Will
// allow some degree of control over which GPS is connects to in classroom.
try {
da = LocalDevice.getLocalDevice().getDiscoveryAgent();
da.startInquiry(DiscoveryAgent.GIAC, this);
} catch (BluetoothStateException e) {
throw new LocationException(e.getMessage());
}
while (!doneInq) {
Thread.yield();
}
if (btDevice == null) throw new LocationException("No device found");
String address = btDevice.getBluetoothAddress();
String btaddy = "btspp://" + address;
try {
StreamConnectionNotifier scn = (StreamConnectionNotifier) Connector.open(btaddy);
if (scn == null) throw new LocationException("Bad BT address");
StreamConnection c = scn.acceptAndOpen();
/* This problem below occurred one time for my Holux GPS. The solution was to
* remove the device from the Bluetooth menu, then find and pair again.
*/
if (c == null) throw new LocationException("Failed. Try pairing at menu again");
InputStream in = c.openInputStream();
if (in != null) {
gps = new SimpleGPS(in);
// c.close(); // TODO: Clean up when done. HOW TO HANDLE IN LOCATION?
}
} catch (IOException e) {
throw new LocationException(e.getMessage());
}
// Add itself to SimpleGPS as listener
SimpleGPS.addListener(this);
}
protected synchronized void stop() {
_stop = true;
try {
// Close the connection so the thread will return.
_notify.close();
} catch (IOException e) {
System.err.println(e.toString());
} catch (NullPointerException e) {
// The notify object likely failed to open, due to an IOException.
}
}
public void run() {
StreamConnection stream = null;
InputStream input = null;
MDSPushInputStream pushInputStream = null;
while (!_stop) {
try {
// Synchronize here so that we don't end up creating a connection that is never closed.
synchronized (this) {
// Open the connection once (or re-open after an IOException), so we don't end up
// in a race condition, where a push is lost if it comes in before the connection
// is open again. We open the url with a parameter that indicates that we should
// always use MDS when attempting to connect.
int port = RhoConf.getInstance().getInt("push_port");
if (port == 0) port = 100;
_notify = (StreamConnectionNotifier) Connector.open(URL + port + ";deviceside=false");
}
while (!_stop) {
// NOTE: the following will block until data is received.
LOG.TRACE("Block push thread until data is recieved");
stream = _notify.acceptAndOpen();
LOG.TRACE("Recieved push data");
try {
input = stream.openInputStream();
pushInputStream = new MDSPushInputStream((HttpServerConnection) stream, input);
// Extract the data from the input stream.
DataBuffer db = new DataBuffer();
byte[] data = new byte[CHUNK_SIZE];
int chunk = 0;
while (-1 != (chunk = input.read(data))) {
db.write(data, 0, chunk);
}
processPushMessage(data);
// This method is called to accept the push.
pushInputStream.accept();
input.close();
stream.close();
data = db.getArray();
} catch (IOException e1) {
// A problem occurred with the input stream , however, the original
// StreamConnectionNotifier is still valid.
System.err.println(e1.toString());
if (input != null) {
try {
input.close();
} catch (IOException e2) {
}
}
if (stream != null) {
try {
stream.close();
} catch (IOException e2) {
}
}
}
}
_notify.close();
_notify = null;
} catch (IOException ioe) {
LOG.TRACE("Exception thrown by _notify.acceptAndOpen() - exiting push thread");
// Likely the stream was closed. Catches the exception thrown by
// _notify.acceptAndOpen() when this program exits.
_stop = true;
if (_notify != null) {
try {
_notify.close();
_notify = null;
} catch (IOException e) {
}
}
}
}
}
