public void notifyObserversTipAdded(TipAddedMessage tipAdded)
{
NotifyObservers(observer =>
{
observer.onTipAdded(tipAdded.tipAmount);
});
}
public void OnTipAdded(com.clover.remotepay.transport.TipAddedMessage message)
{
OnTipAddedMessage method = new OnTipAddedMessage();
method.payload = message;
string messageContent = Serialize(method);
WebSocket.Send(messageContent);
}
public void notifyObserversTipAdded(TipAddedMessage tipAdded)
{
foreach (ICloverDeviceObserver observer in deviceObservers)
{
BackgroundWorker bw = new BackgroundWorker();
// what to do in the background thread
bw.DoWork += new DoWorkEventHandler(delegate(object o, DoWorkEventArgs args)
{
observer.onTipAdded(tipAdded.tipAmount);
});
bw.RunWorkerAsync();
}
}
public void OnTipAdded(TipAddedMessage message)
{
throw new NotImplementedException();
}
public void OnTipAdded(com.clover.remotepay.transport.TipAddedMessage message)
{
Send("/TipAdded", Serialize(message));
}
////////////////// CloverTipListener Methods //////////////////////
public void OnTipAdded(TipAddedMessage message)
{
if (message.tipAmount > 0)
{
string msg = "Tip Added: " + (message.tipAmount / 100.0).ToString("C2");
OnDeviceActivityStart(new CloverDeviceEvent(0, msg));
}
}
/// <summary>
/// Parse the generic message and figure out which handler should be used for processing
/// </summary>
/// <param name="message">The message.</param>
public void onMessage(string message)
{
#if DEBUG
Console.WriteLine("Received raw message: " + message);
#endif
RemoteMessage rMessage = null;
try
{
// Note: This handling was changed after the 1.4.2 release to properly suppress uknown messages.
// Old versions of the WinSDK will crash with unknown messages, and old versions are still expected to be in customer's hands.
// When testing releases, make sure any suppressed errors here are paid proper backwards-compatible attention and tested
// Deserialize the message object to a real object
rMessage = JsonUtils.DeserializeSdk <RemoteMessage>(message);
remoteMessageVersion = Math.Max(remoteMessageVersion, rMessage.version);
}
catch (Exception exception)
{
// if a remote message can't be parsed, ignore this unknown message; log as appropriate
// - and verify backwards compatiblility story since old WinSDK releases will crash
// TODO: Log message and exception in new logging
}
// Handle and route known messages appropriately
if (rMessage != null)
{
switch (rMessage.method)
{
case Methods.BREAK:
break;
case Methods.ACK:
AcknowledgementMessage ackMessage = JsonUtils.DeserializeSdk <AcknowledgementMessage>(rMessage.payload);
notifyObserverAck(ackMessage);
break;
case Methods.CASHBACK_SELECTED:
CashbackSelectedMessage cbsMessage = JsonUtils.DeserializeSdk <CashbackSelectedMessage>(rMessage.payload);
notifyObserversCashbackSelected(cbsMessage);
break;
case Methods.DISCOVERY_RESPONSE:
DiscoveryResponseMessage drMessage = JsonUtils.DeserializeSdk <DiscoveryResponseMessage>(rMessage.payload);
deviceInfo.name = drMessage.name;
deviceInfo.serial = drMessage.serial;
deviceInfo.model = drMessage.model;
notifyObserversDiscoveryResponse(drMessage);
break;
case Methods.FINISH_CANCEL:
FinishCancelMessage finishCancelMessage = JsonUtils.DeserializeSdk <FinishCancelMessage>(rMessage.payload);
notifyObserversFinishCancel(finishCancelMessage.requestInfo);
break;
case Methods.FINISH_OK:
FinishOkMessage fokmsg = JsonUtils.DeserializeSdk <FinishOkMessage>(rMessage.payload);
notifyObserversFinishOk(fokmsg);
break;
case Methods.KEY_PRESS:
KeyPressMessage kpm = JsonUtils.DeserializeSdk <KeyPressMessage>(rMessage.payload);
notifyObserversKeyPressed(kpm);
break;
case Methods.ORDER_ACTION_RESPONSE:
break;
case Methods.PARTIAL_AUTH:
PartialAuthMessage partialAuth = JsonUtils.DeserializeSdk <PartialAuthMessage>(rMessage.payload);
notifyObserversPartialAuth(partialAuth);
break;
case Methods.PAYMENT_VOIDED:
// this seems to only gets called if a Signature is "Canceled" on the device
break;
case Methods.CONFIRM_PAYMENT_MESSAGE:
setPaymentConfirmationIdle(false);
ConfirmPaymentMessage confirmPaymentMessage = JsonUtils.DeserializeSdk <ConfirmPaymentMessage>(rMessage.payload);
notifyObserversConfirmPayment(confirmPaymentMessage);
break;
case Methods.TIP_ADDED:
TipAddedMessage tipMessage = JsonUtils.DeserializeSdk <TipAddedMessage>(rMessage.payload);
notifyObserversTipAdded(tipMessage);
break;
case Methods.TX_START_RESPONSE:
TxStartResponseMessage txsrm = JsonUtils.DeserializeSdk <TxStartResponseMessage>(rMessage.payload);
notifyObserversTxStartResponse(txsrm);
break;
case Methods.TX_STATE:
TxStateMessage txStateMsg = JsonUtils.DeserializeSdk <TxStateMessage>(rMessage.payload);
notifyObserversTxState(txStateMsg);
break;
case Methods.UI_STATE:
UiStateMessage uiStateMsg = JsonUtils.DeserializeSdk <UiStateMessage>(rMessage.payload);
notifyObserversUiState(uiStateMsg);
break;
case Methods.VERIFY_SIGNATURE:
paymentRejected = false;
VerifySignatureMessage vsigMsg = JsonUtils.DeserializeSdk <VerifySignatureMessage>(rMessage.payload);
notifyObserversVerifySignature(vsigMsg);
break;
case Methods.REFUND_RESPONSE:
RefundResponseMessage refRespMsg = JsonUtils.DeserializeSdk <RefundResponseMessage>(rMessage.payload);
notifyObserversRefundPaymentResponse(refRespMsg);
break;
case Methods.TIP_ADJUST_RESPONSE:
TipAdjustResponseMessage tipAdjustMsg = JsonUtils.DeserializeSdk <TipAdjustResponseMessage>(rMessage.payload);
notifyObserversTipAdjusted(tipAdjustMsg);
break;
case Methods.REFUND_REQUEST:
//Outbound no-op
break;
case Methods.VAULT_CARD_RESPONSE:
VaultCardResponseMessage vcrMsg = JsonUtils.DeserializeSdk <VaultCardResponseMessage>(rMessage.payload);
notifyObserversVaultCardResponse(vcrMsg);
break;
case Methods.CARD_DATA_RESPONSE:
ReadCardDataResponseMessage rcdrMsg = JsonUtils.DeserializeSdk <ReadCardDataResponseMessage>(rMessage.payload);
notifyObserversReadCardDataResponse(rcdrMsg);
break;
case Methods.CAPTURE_PREAUTH_RESPONSE:
CapturePreAuthResponseMessage carMsg = JsonUtils.DeserializeSdk <CapturePreAuthResponseMessage>(rMessage.payload);
notifyObserversCapturePreAuthResponse(carMsg);
break;
case Methods.CLOSEOUT_RESPONSE:
CloseoutResponseMessage crMsg = JsonUtils.DeserializeSdk <CloseoutResponseMessage>(rMessage.payload);
notifyObserversCloseoutResponse(crMsg);
break;
case Methods.RETRIEVE_PENDING_PAYMENTS_RESPONSE:
RetrievePendingPaymentsResponseMessage rpprMsg = JsonUtils.DeserializeSdk <RetrievePendingPaymentsResponseMessage>(rMessage.payload);
notifyObserversPendingPaymentsResponse(rpprMsg);
break;
case Methods.ACTIVITY_RESPONSE:
ActivityResponseMessage arm = JsonUtils.DeserializeSdk <ActivityResponseMessage>(rMessage.payload);
notifyObserversActivityResponse(arm);
break;
case Methods.ACTIVITY_MESSAGE_FROM_ACTIVITY:
ActivityMessageFromActivity amfa = JsonUtils.DeserializeSdk <ActivityMessageFromActivity>(rMessage.payload);
notifyObserversActivityMessage(amfa);
break;
case Methods.RESET_DEVICE_RESPONSE:
ResetDeviceResponseMessage rdrm = JsonUtils.DeserializeSdk <ResetDeviceResponseMessage>(rMessage.payload);
notifyObserversDeviceReset(rdrm);
break;
case Methods.RETRIEVE_DEVICE_STATUS_RESPONSE:
RetrieveDeviceStatusResponseMessage rdsrm = JsonUtils.DeserializeSdk <RetrieveDeviceStatusResponseMessage>(rMessage.payload);
notifyObserversRetrieveDeviceStatusResponse(rdsrm);
break;
case Methods.DISCOVERY_REQUEST:
//Outbound no-op
break;
case Methods.ORDER_ACTION_ADD_DISCOUNT:
//Outbound no-op
break;
case Methods.ORDER_ACTION_ADD_LINE_ITEM:
//Outbound no-op
break;
case Methods.ORDER_ACTION_REMOVE_LINE_ITEM:
//Outbound no-op
break;
case Methods.ORDER_ACTION_REMOVE_DISCOUNT:
//Outbound no-op
break;
case Methods.PRINT_CREDIT:
CreditPrintMessage cpm = JsonUtils.DeserializeSdk <CreditPrintMessage>(rMessage.payload);
notifyObserversPrintCredit(cpm);
break;
case Methods.PRINT_CREDIT_DECLINE:
DeclineCreditPrintMessage dcpm = JsonUtils.DeserializeSdk <DeclineCreditPrintMessage>(rMessage.payload);
notifyObserversPrintCreditDecline(dcpm);
break;
case Methods.PRINT_PAYMENT:
PaymentPrintMessage ppm = JsonUtils.DeserializeSdk <PaymentPrintMessage>(rMessage.payload);
notifyObserversPrintPayment(ppm);
break;
case Methods.PRINT_PAYMENT_DECLINE:
DeclinePaymentPrintMessage dppm = JsonUtils.DeserializeSdk <DeclinePaymentPrintMessage>(rMessage.payload);
notifyObserversPrintPaymentDecline(dppm);
break;
case Methods.PRINT_PAYMENT_MERCHANT_COPY:
PaymentPrintMerchantCopyMessage ppmcm = JsonUtils.DeserializeSdk <PaymentPrintMerchantCopyMessage>(rMessage.payload);
notifyObserversPrintMerchantCopy(ppmcm);
break;
case Methods.REFUND_PRINT_PAYMENT:
RefundPaymentPrintMessage rppm = JsonUtils.DeserializeSdk <RefundPaymentPrintMessage>(rMessage.payload);
notifyObserversPrintRefund(rppm);
break;
case Methods.RETRIEVE_PAYMENT_RESPONSE:
RetrievePaymentResponseMessage rprm = JsonUtils.DeserializeSdk <RetrievePaymentResponseMessage>(rMessage.payload);
notifyObserversRetrievePaymentResponse(rprm);
break;
case Methods.GET_PRINTERS_RESPONSE:
RetrievePrintersResponseMessage rtrm = JsonUtils.DeserializeSdk <RetrievePrintersResponseMessage>(rMessage.payload);
notifyObserversRetrievePrinterResponse(rtrm);
break;
case Methods.PRINT_JOB_STATUS_RESPONSE:
PrintJobStatusResponseMessage pjsrm = JsonUtils.DeserializeSdk <PrintJobStatusResponseMessage>(rMessage.payload);
notifyObserversRetrievePrintJobStatus(pjsrm);
break;
case Methods.SHOW_RECEIPT_OPTIONS_RESPONSE:
ShowReceiptOptionsResponseMessage srorm = JsonUtils.DeserializeSdk <ShowReceiptOptionsResponseMessage>(rMessage.payload);
notifyObserverDisplayReceiptOptionsResponse(srorm);
break;
case Methods.CUSTOMER_PROVIDED_DATA_MESSAGE:
notifyObserversCustomerProvidedData(JsonUtils.DeserializeSdk <CustomerProvidedDataResponseMessage>(rMessage.payload));
break;
case Methods.PRINT_IMAGE:
//Outbound no-op
break;
case Methods.PRINT_TEXT:
//Outbound no-op
break;
case Methods.SHOW_ORDER_SCREEN:
//Outbound no-op
break;
case Methods.SHOW_PAYMENT_RECEIPT_OPTIONS:
//Outbound no-op
break;
case Methods.SHOW_REFUND_RECEIPT_OPTIONS:
//Outbound no-op
break;
case Methods.SHOW_CREDIT_RECEIPT_OPTIONS:
//Outbound no-op
break;
case Methods.SHOW_THANK_YOU_SCREEN:
//Outbound no-op
break;
case Methods.SHOW_WELCOME_SCREEN:
//Outbound no-op
break;
case Methods.SIGNATURE_VERIFIED:
//Outbound no-op
break;
case Methods.TERMINAL_MESSAGE:
//Outbound no-op
break;
case Methods.TX_START:
//Outbound no-op
break;
case Methods.VOID_PAYMENT:
//Outbound no-op
break;
case Methods.VOID_PAYMENT_RESPONSE:
VoidPaymentResponseMessage vprm = JsonUtils.DeserializeSdk <VoidPaymentResponseMessage>(rMessage.payload);
notifyObserversPaymentVoided(vprm);
break;
case Methods.CLOSEOUT_REQUEST:
//Outbound no-op
break;
case Methods.VAULT_CARD:
//Outbound no-op
break;
case Methods.CARD_DATA:
//Outbound no-op
break;
case Methods.CLOVER_DEVICE_LOG_REQUEST:
//Outbound no-op
break;
default:
// Messsage Method not recognized or null: usually rMessage.type == MessageTypes.PING instead of normal Command message
if (rMessage.type == MessageTypes.PING)
{
onPing();
}
break;
}
}
}
/// <summary>
/// This handles parsing the generic message and figuring
/// out which handler should be used for processing
/// </summary>
/// <param name="message">The message.</param>
public void onMessage(string message)
{
#if DEBUG
Console.WriteLine("Received raw message: " + message);
#endif
//CloverTransportObserver
// Deserialize the message object to a real object, and figure
RemoteMessage rMessage = JsonUtils.deserializeSDK <RemoteMessage>(message);
remoteMessageVersion = Math.Max(remoteMessageVersion, rMessage.version);
switch (rMessage.method)
{
case Methods.BREAK:
break;
case Methods.ACK:
AcknowledgementMessage ackMessage = JsonUtils.deserializeSDK <AcknowledgementMessage>(rMessage.payload);
notifyObserverAck(ackMessage);
break;
case Methods.CASHBACK_SELECTED:
CashbackSelectedMessage cbsMessage = JsonUtils.deserializeSDK <CashbackSelectedMessage>(rMessage.payload);
notifyObserversCashbackSelected(cbsMessage);
break;
case Methods.DISCOVERY_RESPONSE:
DiscoveryResponseMessage drMessage = JsonUtils.deserializeSDK <DiscoveryResponseMessage>(rMessage.payload);
deviceInfo.name = drMessage.name;
deviceInfo.serial = drMessage.serial;
deviceInfo.model = drMessage.model;
notifyObserversDiscoveryResponse(drMessage);
break;
case Methods.FINISH_CANCEL:
FinishCancelMessage finishCancelMessage = JsonUtils.deserializeSDK <FinishCancelMessage>(rMessage.payload);
notifyObserversFinishCancel(finishCancelMessage.requestInfo);
break;
case Methods.FINISH_OK:
FinishOkMessage fokmsg = JsonUtils.deserializeSDK <FinishOkMessage>(rMessage.payload);
notifyObserversFinishOk(fokmsg);
break;
case Methods.KEY_PRESS:
KeyPressMessage kpm = JsonUtils.deserializeSDK <KeyPressMessage>(rMessage.payload);
notifyObserversKeyPressed(kpm);
break;
case Methods.ORDER_ACTION_RESPONSE:
break;
case Methods.PARTIAL_AUTH:
PartialAuthMessage partialAuth = JsonUtils.deserializeSDK <PartialAuthMessage>(rMessage.payload);
notifyObserversPartialAuth(partialAuth);
break;
case Methods.PAYMENT_VOIDED:
// this seems to only gets called if a Signature is "Canceled" on the device
break;
case Methods.CONFIRM_PAYMENT_MESSAGE:
setPaymentConfirmationIdle(false);
ConfirmPaymentMessage confirmPaymentMessage = JsonUtils.deserializeSDK <ConfirmPaymentMessage>(rMessage.payload);
notifyObserversConfirmPayment(confirmPaymentMessage);
break;
case Methods.TIP_ADDED:
TipAddedMessage tipMessage = JsonUtils.deserializeSDK <TipAddedMessage>(rMessage.payload);
notifyObserversTipAdded(tipMessage);
break;
case Methods.TX_START_RESPONSE:
TxStartResponseMessage txsrm = JsonUtils.deserializeSDK <TxStartResponseMessage>(rMessage.payload);
notifyObserversTxStartResponse(txsrm);
break;
case Methods.TX_STATE:
TxStateMessage txStateMsg = JsonUtils.deserializeSDK <TxStateMessage>(rMessage.payload);
notifyObserversTxState(txStateMsg);
break;
case Methods.UI_STATE:
UiStateMessage uiStateMsg = JsonUtils.deserializeSDK <UiStateMessage>(rMessage.payload);
notifyObserversUiState(uiStateMsg);
break;
case Methods.VERIFY_SIGNATURE:
paymentRejected = false;
VerifySignatureMessage vsigMsg = JsonUtils.deserializeSDK <VerifySignatureMessage>(rMessage.payload);
notifyObserversVerifySignature(vsigMsg);
break;
case Methods.REFUND_RESPONSE:
RefundResponseMessage refRespMsg = JsonUtils.deserializeSDK <RefundResponseMessage>(rMessage.payload);
notifyObserversRefundPaymentResponse(refRespMsg);
break;
case Methods.TIP_ADJUST_RESPONSE:
TipAdjustResponseMessage tipAdjustMsg = JsonUtils.deserializeSDK <TipAdjustResponseMessage>(rMessage.payload);
notifyObserversTipAdjusted(tipAdjustMsg);
break;
case Methods.REFUND_REQUEST:
//Outbound no-op
break;
case Methods.VAULT_CARD_RESPONSE:
VaultCardResponseMessage vcrMsg = JsonUtils.deserializeSDK <VaultCardResponseMessage>(rMessage.payload);
notifyObserversVaultCardResponse(vcrMsg);
break;
case Methods.CARD_DATA_RESPONSE:
ReadCardDataResponseMessage rcdrMsg = JsonUtils.deserializeSDK <ReadCardDataResponseMessage>(rMessage.payload);
notifyObserversReadCardDataResponse(rcdrMsg);
break;
case Methods.CAPTURE_PREAUTH_RESPONSE:
CapturePreAuthResponseMessage carMsg = JsonUtils.deserializeSDK <CapturePreAuthResponseMessage>(rMessage.payload);
notifyObserversCapturePreAuthResponse(carMsg);
break;
case Methods.CLOSEOUT_RESPONSE:
CloseoutResponseMessage crMsg = JsonUtils.deserializeSDK <CloseoutResponseMessage>(rMessage.payload);
notifyObserversCloseoutResponse(crMsg);
break;
case Methods.RETRIEVE_PENDING_PAYMENTS_RESPONSE:
RetrievePendingPaymentsResponseMessage rpprMsg = JsonUtils.deserializeSDK <RetrievePendingPaymentsResponseMessage>(rMessage.payload);
notifyObserversPendingPaymentsResponse(rpprMsg);
break;
case Methods.ACTIVITY_RESPONSE:
ActivityResponseMessage arm = JsonUtils.deserializeSDK <ActivityResponseMessage>(rMessage.payload);
notifyObserversActivityResponse(arm);
break;
case Methods.ACTIVITY_MESSAGE_FROM_ACTIVITY:
ActivityMessageFromActivity amfa = JsonUtils.deserializeSDK <ActivityMessageFromActivity>(rMessage.payload);
notifyObserversActivityMessage(amfa);
break;
case Methods.RESET_DEVICE_RESPONSE:
ResetDeviceResponseMessage rdrm = JsonUtils.deserializeSDK <ResetDeviceResponseMessage>(rMessage.payload);
notifyObserversDeviceReset(rdrm);
break;
case Methods.RETRIEVE_DEVICE_STATUS_RESPONSE:
RetrieveDeviceStatusResponseMessage rdsrm = JsonUtils.deserializeSDK <RetrieveDeviceStatusResponseMessage>(rMessage.payload);
notifyObserversRetrieveDeviceStatusResponse(rdsrm);
break;
case Methods.DISCOVERY_REQUEST:
//Outbound no-op
break;
case Methods.ORDER_ACTION_ADD_DISCOUNT:
//Outbound no-op
break;
case Methods.ORDER_ACTION_ADD_LINE_ITEM:
//Outbound no-op
break;
case Methods.ORDER_ACTION_REMOVE_LINE_ITEM:
//Outbound no-op
break;
case Methods.ORDER_ACTION_REMOVE_DISCOUNT:
//Outbound no-op
break;
case Methods.PRINT_CREDIT:
CreditPrintMessage cpm = JsonUtils.deserializeSDK <CreditPrintMessage>(rMessage.payload);
notifyObserversPrintCredit(cpm);
break;
case Methods.PRINT_CREDIT_DECLINE:
DeclineCreditPrintMessage dcpm = JsonUtils.deserializeSDK <DeclineCreditPrintMessage>(rMessage.payload);
notifyObserversPrintCreditDecline(dcpm);
break;
case Methods.PRINT_PAYMENT:
PaymentPrintMessage ppm = JsonUtils.deserializeSDK <PaymentPrintMessage>(rMessage.payload);
notifyObserversPrintPayment(ppm);
break;
case Methods.PRINT_PAYMENT_DECLINE:
DeclinePaymentPrintMessage dppm = JsonUtils.deserializeSDK <DeclinePaymentPrintMessage>(rMessage.payload);
notifyObserversPrintPaymentDecline(dppm);
break;
case Methods.PRINT_PAYMENT_MERCHANT_COPY:
PaymentPrintMerchantCopyMessage ppmcm = JsonUtils.deserializeSDK <PaymentPrintMerchantCopyMessage>(rMessage.payload);
notifyObserversPrintMerchantCopy(ppmcm);
break;
case Methods.REFUND_PRINT_PAYMENT:
RefundPaymentPrintMessage rppm = JsonUtils.deserializeSDK <RefundPaymentPrintMessage>(rMessage.payload);
notifyObserversPrintRefund(rppm);
break;
case Methods.RETRIEVE_PAYMENT_RESPONSE:
RetrievePaymentResponseMessage rprm = JsonUtils.deserializeSDK <RetrievePaymentResponseMessage>(rMessage.payload);
notifyObserversRetrievePaymentResponse(rprm);
break;
case Methods.GET_PRINTERS_RESPONSE:
RetrievePrintersResponseMessage rtrm = JsonUtils.deserializeSDK <RetrievePrintersResponseMessage>(rMessage.payload);
notifyObserversRetrievePrinterResponse(rtrm);
break;
case Methods.PRINT_JOB_STATUS_RESPONSE:
PrintJobStatusResponseMessage pjsrm = JsonUtils.deserializeSDK <PrintJobStatusResponseMessage>(rMessage.payload);
notifyObserversRetrievePrintJobStatus(pjsrm);
break;
case Methods.PRINT_IMAGE:
//Outbound no-op
break;
case Methods.PRINT_TEXT:
//Outbound no-op
break;
case Methods.SHOW_ORDER_SCREEN:
//Outbound no-op
break;
case Methods.SHOW_PAYMENT_RECEIPT_OPTIONS:
//Outbound no-op
break;
case Methods.SHOW_REFUND_RECEIPT_OPTIONS:
//Outbound no-op
break;
case Methods.SHOW_CREDIT_RECEIPT_OPTIONS:
//Outbound no-op
break;
case Methods.SHOW_THANK_YOU_SCREEN:
//Outbound no-op
break;
case Methods.SHOW_WELCOME_SCREEN:
//Outbound no-op
break;
case Methods.SIGNATURE_VERIFIED:
//Outbound no-op
break;
case Methods.TERMINAL_MESSAGE:
//Outbound no-op
break;
case Methods.TX_START:
//Outbound no-op
break;
case Methods.VOID_PAYMENT:
//Outbound no-op
break;
case Methods.CLOSEOUT_REQUEST:
//Outbound no-op
break;
case Methods.VAULT_CARD:
//Outbound no-op
break;
case Methods.CARD_DATA:
//Outbound no-op
break;
}
}
public void OnTipAdded(TipAddedMessage message)
{
}
public void notifyObserversTipAdded(TipAddedMessage tipAdded)
{
foreach(ICloverDeviceObserver observer in deviceObservers)
{
BackgroundWorker bw = new BackgroundWorker();
// what to do in the background thread
bw.DoWork += new DoWorkEventHandler(
delegate (object o, DoWorkEventArgs args)
{
BackgroundWorker b = o as BackgroundWorker;
observer.onTipAdded(tipAdded.tipAmount);
});
bw.RunWorkerAsync();
}
}