Delphi DLL

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 DLL

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, JsonArray, StringBuilder, Rest, JsonObject;

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Boolean;
rest: HCkRest;
bAutoReconnect: Boolean;
sbToken: HCkStringBuilder;
topicOrQueueName: PWideChar;
json: HCkJsonObject;
jsonA: HCkJsonArray;
sbRequestBody: HCkStringBuilder;
sbPath: HCkStringBuilder;
sbResponseBody: HCkStringBuilder;

begin
success := False;

// 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 := CkRest_Create();
bAutoReconnect := True;
success := CkRest_Connect(rest,'<yournamespace>.servicebus.windows.net',443,True,bAutoReconnect);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkRest__lastErrorText(rest));
    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 := CkStringBuilder_Create();
CkStringBuilder_LoadFile(sbToken,'qa_data/tokens/serviceBusSas.txt','utf-8');

// Tell the REST object to use the Azure Shared Access Signature for authorization.
CkStringBuilder_Prepend(sbToken,'SharedAccessSignature ');
CkRest_AddHeader(rest,'Authorization',CkStringBuilder__getAsString(sbToken));

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

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

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

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

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

jsonA := CkJsonObject_ArrayOf(json,'messages');
CkJsonArray_putEmitCompact(jsonA,False);
Memo1.Lines.Add(CkJsonArray__emit(jsonA));

// 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 := CkStringBuilder_Create();
CkJsonArray_putEmitCompact(jsonA,True);
CkJsonArray_EmitSb(jsonA,sbRequestBody);
CkJsonArray_Dispose(jsonA);

// Build the path..
sbPath := CkStringBuilder_Create();
CkStringBuilder_Append(sbPath,'/');
CkStringBuilder_Append(sbPath,topicOrQueueName);
CkStringBuilder_Append(sbPath,'/messages');

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

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

sbResponseBody := CkStringBuilder_Create();
success := CkRest_FullRequestSb(rest,'POST',CkStringBuilder__getAsString(sbPath),sbRequestBody,sbResponseBody);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkRest__lastErrorText(rest));
    Exit;
  end;

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

// Check for a success response.
if (CkRest_getResponseStatusCode(rest) <> 201) then
  begin
    Memo1.Lines.Add(CkRest__lastRequestStartLine(rest));
    Memo1.Lines.Add(CkRest__lastRequestHeader(rest));
    Memo1.Lines.Add(CkStringBuilder__getAsString(sbResponseBody));
    Memo1.Lines.Add('Failed.');
    Exit;
  end;

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

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

CkRest_Dispose(rest);
CkStringBuilder_Dispose(sbToken);
CkJsonObject_Dispose(json);
CkStringBuilder_Dispose(sbRequestBody);
CkStringBuilder_Dispose(sbPath);
CkStringBuilder_Dispose(sbResponseBody);

end;