Dart

Azure Service Bus - Receive and Delete Message from Subscription

See more Azure Service Bus Examples

Shows how to receive and delete a message from an Azure service bus topic subscription. 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());

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

  // Receive a message from the subscription "feedings" in the topic "gilaMonster"
  final topicName = 'gilaMonster';
  final subscriptionName = 'feedings';

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

  // Add a timeout parameter.
  rest.addQueryParam('timeout', '20');

  // Use the DELETE HTTP verb to read the message at the head of the queue and remove it.
  final sbResponseBody = CkStringBuilder();
  try {
    rest.fullRequestNoBodySb('DELETE', sbPath.getAsString(), sbResponseBody);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

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

  // Check for a success response.
  if (rest.responseStatusCode != 200) {
    print(rest.lastRequestStartLine);
    print(rest.lastRequestHeader);
    print(sbResponseBody.getAsString());
    print('Failed.');
    return;
  }

  // If successful, the message is the contents of the response body.
  final message = sbResponseBody.getAsString();
  print('Received message: $message');

  print('Success.');
}