Delphi ActiveX

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. Delphi ActiveX

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Chilkat_TLB;

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Integer;
rest: TChilkatRest;
bAutoReconnect: Integer;
sbToken: TChilkatStringBuilder;
topicOrQueueName: WideString;
json: TChilkatJsonObject;
jsonA: IChilkatJsonArray;
sbRequestBody: TChilkatStringBuilder;
sbPath: TChilkatStringBuilder;
sbResponseBody: TChilkatStringBuilder;

begin
success := 0;

// 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.
rest := TChilkatRest.Create(Self);
bAutoReconnect := 1;
success := rest.Connect('<yournamespace>.servicebus.windows.net',443,1,bAutoReconnect);
if (success <> 1) then
  begin
    Memo1.Lines.Add(rest.LastErrorText);
    Exit;
  end;

// ----------------------------------------------------------------------------------------------
// 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.
sbToken := TChilkatStringBuilder.Create(Self);
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";
topicOrQueueName := 'gilaMonster';

// The HTTP request body contains JSON that contains multiple messages.
json := TChilkatJsonObject.Create(Self);
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');

jsonA := json.ArrayOf('messages');
jsonA.EmitCompact := 0;
Memo1.Lines.Add(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"
// 	    }
// 	  }
// 	]

sbRequestBody := TChilkatStringBuilder.Create(Self);
jsonA.EmitCompact := 1;
jsonA.EmitSb(sbRequestBody.ControlInterface);

// Build the path..
sbPath := TChilkatStringBuilder.Create(Self);
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');

sbResponseBody := TChilkatStringBuilder.Create(Self);
success := rest.FullRequestSb('POST',sbPath.GetAsString(),sbRequestBody.ControlInterface,sbResponseBody.ControlInterface);
if (success <> 1) then
  begin
    Memo1.Lines.Add(rest.LastErrorText);
    Exit;
  end;

Memo1.Lines.Add('Response Status Code = ' + IntToStr(rest.ResponseStatusCode));

// Check for a success response.
if (rest.ResponseStatusCode <> 201) then
  begin
    Memo1.Lines.Add(rest.LastRequestStartLine);
    Memo1.Lines.Add(rest.LastRequestHeader);
    Memo1.Lines.Add(sbResponseBody.GetAsString());
    Memo1.Lines.Add('Failed.');
    Exit;
  end;

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

Memo1.Lines.Add('Success.');
end;