Dart

Azure Service Bus - Send Message to Topic

See more Azure Service Bus Examples

Example code showing how to send a message to an Azure Service Bus Topic. Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // Note: Requires Chilkat v9.5.0.65 or greater.

  // This requires the Chilkat API to have been previously unlocked.
  // See Global Unlock Sample for sample code.

  // Make the initial connection.
  // A single REST object, once connected, can be used for many Azure Service Bus REST API calls.
  // The auto-reconnect indicates that if the already-established HTTPS connection is closed,
  // then it will be automatically re-established as needed.
  final rest = CkRest();
  final bAutoReconnect = true;
  try {
    rest.connect('<yournamespace>.servicebus.windows.net', 443, true, bAutoReconnect);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // ----------------------------------------------------------------------------------------------
  // The code above this comment could be placed inside a function/subroutine within the application
  // because the connection does not need to be made for every request.  Once the connection is made
  // the app may send many requests..
  // ----------------------------------------------------------------------------------------------

  // Let's load a previously computed SAS token and use it.
  // See Azure Shared Access Signature for an example to genenerate an Azure SAS token.
  final sbToken = CkStringBuilder();
  sbToken.loadFile('qa_data/tokens/serviceBusSas.txt', 'utf-8');

  // Tell the REST object to use the Azure Shared Access Signature for authorization.
  sbToken.prepend('SharedAccessSignature ');
  rest.addHeader('Authorization', sbToken.getAsString());

  // ----------------------------------------------------------------------------------------------

  // The code for sending to a topic is identical to the code sending to a queue.
  // The only difference is that a topic name (or topic path) is used instead of queue name/path.

  // Send to a topic named "gilaMonster";
  final topicName = 'gilaMonster';

  // The HTTP request body contains the content of the message sent to the topic.
  final sbRequestBody = CkStringBuilder();
  sbRequestBody.append('Hello, I\'m a gila monster!');

  // Build the path..
  final sbPath = CkStringBuilder();
  sbPath.append('/');
  sbPath.append(topicName);
  sbPath.append('/messages');

  // Add timeout and api-version query parameters.
  rest.addQueryParam('timeout', '20');
  rest.addQueryParam('api-version', '2013-08');

  // Standard brokered message properties are placed in a BrokerProperties HTTP header. 
  // The broker properties must be serialized in JSON format. To specify a TimeToLive value of 3600 seconds 
  // and to add a message label "M1" to the message..
  final json = CkJsonObject();
  json.appendInt('TimeToLive', 3600);
  json.appendString('Label', 'A123');
  rest.addHeader('BrokerProperties', json.emit());

  // To add custom properties, such as "Priority" and "Color"
  rest.addHeader('Priority', 'High');
  rest.addHeader('Color', 'pink');

  final sbResponseBody = CkStringBuilder();
  try {
    rest.fullRequestSb('POST', sbPath.getAsString(), sbRequestBody, sbResponseBody);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print('Response Status Code = ${rest.responseStatusCode}');

  // Check for a success response.
  if (rest.responseStatusCode != 201) {
    print(rest.lastRequestStartLine);
    print(rest.lastRequestHeader);
    print(sbResponseBody.getAsString());
    print('Failed.');
    return;
  }

  // If successful, the 201 response will have no response body.

  print('Success.');
}