Dart

Azure Service Bus - Send Batch of Messages to Topic or Queue

See more Azure Service Bus Examples

Shows how to send a batch of messages to a service bus queue or 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());

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

  // Send to a topic (or queue) named "gilaMonster";
  final topicOrQueueName = 'gilaMonster';

  // The HTTP request body contains JSON that contains multiple messages.
  final json = CkJsonObject();
  json.i = 0;
  json.updateString('messages[i].Body', 'This is the first message');
  json.updateString('messages[i].BrokerProperties.Label', 'M1');
  json.updateString('messages[i].BrokerProperties.TimeToLiveTimeSpan', '0.00:00:40');

  json.i = 1;
  json.updateString('messages[i].Body', 'This is the second message');
  json.updateString('messages[i].BrokerProperties.Label', 'M2');
  json.updateString('messages[i].UserProperties.Priority', 'Low');

  json.i = 2;
  json.updateString('messages[i].Body', 'This is the third message');
  json.updateString('messages[i].BrokerProperties.Label', 'M3');
  json.updateString('messages[i].UserProperties.Priority', 'Medium');
  json.updateString('messages[i].UserProperties.Customer', 'ABC');

  final jsonA = json.arrayOf('messages');
  jsonA.emitCompact = false;
  print(jsonA.emit());

  // The following JSON array is produced by the above code:

  // 	[
  // 	  {
  // 	    "Body": "This is the first message",
  // 	    "BrokerProperties": {
  // 	      "Label": "M1",
  // 	      "TimeToLiveTimeSpan": "0.00:00:40"
  // 	    }
  // 	  },
  // 	  {
  // 	    "Body": "This is the second message",
  // 	    "BrokerProperties": {
  // 	      "Label": "M2"
  // 	    },
  // 	    "UserProperties": {
  // 	      "Priority": "Low"
  // 	    }
  // 	  },
  // 	  {
  // 	    "Body": "This is the third message",
  // 	    "BrokerProperties": {
  // 	      "Label": "M3"
  // 	    },
  // 	    "UserProperties": {
  // 	      "Priority": "Medium",
  // 	      "Customer": "ABC"
  // 	    }
  // 	  }
  // 	]

  final sbRequestBody = CkStringBuilder();
  jsonA.emitCompact = true;
  jsonA.emitSb(sbRequestBody);

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

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

  // The Content-Type should be "application/vnd.microsoft.servicebus.json"
  rest.addHeader('Content-Type', 'application/vnd.microsoft.servicebus.json');

  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.');
}