protected override void OnHandleIntent(Intent intent)
{
try
{
var context = this.ApplicationContext;
var action = intent.Action;
if (action.Equals(Constants.INTENT_FROM_GCM_REGISTRATION_CALLBACK))
{
handleRegistration(context, intent);
}
else if (action.Equals(Constants.INTENT_FROM_GCM_MESSAGE))
{
// checks for special messages
var messageType = intent.GetStringExtra(Constants.EXTRA_SPECIAL_MESSAGE);
if (messageType != null)
{
if (messageType.Equals(Constants.VALUE_DELETED_MESSAGES))
{
var sTotal = intent.GetStringExtra(Constants.EXTRA_TOTAL_DELETED);
if (!string.IsNullOrEmpty(sTotal))
{
int nTotal = 0;
if (int.TryParse(sTotal, out nTotal))
{
Logger.Debug("Received deleted messages notification: " + nTotal);
OnDeletedMessages(context, nTotal);
}
else
{
Logger.Debug("GCM returned invalid number of deleted messages: " + sTotal);
}
}
}
else
{
// application is not using the latest GCM library
Logger.Debug("Received unknown special message: " + messageType);
}
}
else
{
OnMessage(context, intent);
}
}
else if (action.Equals(Constants.INTENT_FROM_GCM_LIBRARY_RETRY))
{
var token = intent.GetStringExtra(EXTRA_TOKEN);
if (!string.IsNullOrEmpty(token) && !TOKEN.Equals(token))
{
// make sure intent was generated by this class, not by a
// malicious app.
Logger.Debug("Received invalid token: " + token);
return;
}
// retry last call
if (GcmClient.IsRegistered(context))
{
GcmClient.internalUnRegister(context);
}
else
{
GcmClient.internalRegister(context, SenderIds);
}
}
}
finally
{
// Release the power lock, so phone can get back to sleep.
// The lock is reference-counted by default, so multiple
// messages are ok.
// If OnMessage() needs to spawn a thread or do something else,
// it should use its own lock.
lock (LOCK)
{
//Sanity check for null as this is a public method
if (sWakeLock != null)
{
Logger.Debug("Releasing Wakelock");
sWakeLock.Release();
}
else
{
//Should never happen during normal workflow
Logger.Debug("Wakelock reference is null");
}
}
}
}
private void handleRegistration(Context context, Intent intent)
{
var registrationId = intent.GetStringExtra(Constants.EXTRA_REGISTRATION_ID);
var error = intent.GetStringExtra(Constants.EXTRA_ERROR);
var unregistered = intent.GetStringExtra(Constants.EXTRA_UNREGISTERED);
Logger.Debug("handleRegistration: registrationId = " + registrationId + ", error = " + error + ", unregistered = " + unregistered);
// registration succeeded
if (registrationId != null)
{
GcmClient.ResetBackoff(context);
GcmClient.SetRegistrationId(context, registrationId);
OnRegistered(context, registrationId);
return;
}
// unregistration succeeded
if (unregistered != null)
{
// Remember we are unregistered
GcmClient.ResetBackoff(context);
var oldRegistrationId = GcmClient.ClearRegistrationId(context);
OnUnRegistered(context, oldRegistrationId);
return;
}
// last operation (registration or unregistration) returned an error;
Logger.Debug("Registration error: " + error);
// Registration failed
if (Constants.ERROR_SERVICE_NOT_AVAILABLE.Equals(error))
{
var retry = OnRecoverableError(context, error);
if (retry)
{
int backoffTimeMs = GcmClient.GetBackoff(context);
int nextAttempt = backoffTimeMs / 2 + sRandom.Next(backoffTimeMs);
Logger.Debug("Scheduling registration retry, backoff = " + nextAttempt + " (" + backoffTimeMs + ")");
var retryIntent = new Intent(Constants.INTENT_FROM_GCM_LIBRARY_RETRY);
retryIntent.PutExtra(EXTRA_TOKEN, TOKEN);
var retryPendingIntent = PendingIntent.GetBroadcast(context, 0, retryIntent, PendingIntentFlags.OneShot);
var am = AlarmManager.FromContext(context);
am.Set(AlarmType.ElapsedRealtime, SystemClock.ElapsedRealtime() + nextAttempt, retryPendingIntent);
// Next retry should wait longer.
if (backoffTimeMs < MAX_BACKOFF_MS)
{
GcmClient.SetBackoff(context, backoffTimeMs * 2);
}
}
else
{
Logger.Debug("Not retrying failed operation");
}
}
else
{
// Unrecoverable error, notify app
OnError(context, error);
}
}