Pascal (Lazarus/Delphi)

Azure Service Bus - Create Topic

See more Azure Service Bus Examples

Creates an Azure Service Bus Topic.

Note: This example requires Chilkat v9.5.0.65 or greater.

Pascal (Lazarus/Delphi)

program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.StringBuilder,
  Chilkat.Rest,
  Chilkat.Xml;

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

procedure RunDemo;
var
  success: Boolean;
  rest: TRest;
  bAutoReconnect: Boolean;
  sbToken: TStringBuilder;
  topicName: string;
  xml: TXml;
  sbRequestBody: TStringBuilder;
  sbPath: TStringBuilder;
  sbResponseBody: TStringBuilder;

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 := TRest.Create;
  bAutoReconnect := True;
  success := rest.Connect('<yournamespace>.servicebus.windows.net',443,True,bAutoReconnect);
  if (success <> True) then
    begin
      WriteLn(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 := TStringBuilder.Create;
  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());

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

  //  Create a new topic named "gilaMonster";
  topicName := 'gilaMonster';

  //  Create the XML body of the PUT request.
  xml := TXml.Create;
  xml.Tag := 'entry';
  xml.AddAttribute('xmlns','http://www.w3.org/2005/Atom');
  xml.UpdateAttrAt('title',True,'type','text');
  xml.UpdateChildContent('title',topicName);
  xml.UpdateAttrAt('content',True,'type','application/xml');
  xml.UpdateAttrAt('content|TopicDescription',True,'xmlns:i','http://www.w3.org/2001/XMLSchema-instance');
  xml.UpdateAttrAt('content|TopicDescription',True,'xmlns','http://schemas.microsoft.com/netservices/2010/10/servicebus/connect');
  xml.EmitXmlDecl := False;
  WriteLn(xml.GetXml());

  //  The XML created by the above code:

  //  	<entry xmlns="http://www.w3.org/2005/Atom">
  //  	    <title type="text">gilaMonster</title>
  //  	    <content type="application/xml">
  //  	        <TopicDescription xmlns:i="http://www.w3.org/2001/XMLSchema-instance" 
  //  			xmlns="http://schemas.microsoft.com/netservices/2010/10/servicebus/connect" />
  //  	    </content>
  //  	</entry>

  sbRequestBody := TStringBuilder.Create;
  xml.GetXmlSb(sbRequestBody);

  //  The path should be set to the to-be-created queue name.
  sbPath := TStringBuilder.Create;
  sbPath.Append('/');
  sbPath.Append(topicName);

  sbResponseBody := TStringBuilder.Create;
  success := rest.FullRequestSb('PUT',sbPath.GetAsString(),sbRequestBody,sbResponseBody);
  if (success <> True) then
    begin
      WriteLn(rest.LastErrorText);
      Exit;
    end;

  WriteLn('Response Status Code = ' + rest.ResponseStatusCode);

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

  //  The response is XML.  (See a sample response below..)
  xml.LoadSb(sbResponseBody,True);
  WriteLn(xml.GetXml());

  WriteLn('Success.');

  //  -----------------------------------------------
  //  A sample successful XML response:

  //  	<entry xmlns="http://www.w3.org/2005/Atom">
  //  	    <id>https://chilkat.servicebus.windows.net/gilaMonster</id>
  //  	    <title type="text">gilaMonster</title>
  //  	    <published>2016-12-06T23:34:13Z</published>
  //  	    <updated>2016-12-06T23:34:13Z</updated>
  //  	    <author>
  //  	        <name>chilkat</name>
  //  	    </author>
  //  	    <link rel="self" href="https://chilkat.servicebus.windows.net/gilaMonster" />
  //  	    <content type="application/xml">
  //  	        <TopicDescription xmlns="http://schemas.microsoft.com/netservices/2010/10/servicebus/connect" xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
  //  	            <DefaultMessageTimeToLive>P10675199DT2H48M5.4775807S</DefaultMessageTimeToLive>
  //  	            <MaxSizeInMegabytes>1024</MaxSizeInMegabytes>
  //  	            <RequiresDuplicateDetection>false</RequiresDuplicateDetection>
  //  	            <DuplicateDetectionHistoryTimeWindow>PT10M</DuplicateDetectionHistoryTimeWindow>
  //  	            <EnableBatchedOperations>true</EnableBatchedOperations>
  //  	            <SizeInBytes>0</SizeInBytes>
  //  	            <CreatedAt>2016-12-06T23:34:13.483</CreatedAt>
  //  	            <UpdatedAt>2016-12-06T23:34:13.7</UpdatedAt>
  //  	        </TopicDescription>
  //  	    </content>
  //  	</entry>


  rest.Free;
  sbToken.Free;
  xml.Free;
  sbRequestBody.Free;
  sbPath.Free;
  sbResponseBody.Free;

end;

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

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.