(Delphi ActiveX) Azure Service Bus - Unlock Message

See more Azure Service Bus Examples

Shows how to unlock a message for processing by other receivers on a specified queue or subscription. This operation deletes the lock object, causing the message to be unlocked.

For more information, see https://docs.microsoft.com/en-us/rest/api/servicebus/unlock-message

Chilkat for Delphi Downloads Chilkat ActiveX DLL for Delphi Chilkat non-ActiveX DLL for Delphi * The examples here use the ActiveX DLL.

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
rest: TChilkatRest;
bAutoReconnect: Integer;
success: Integer;
sbToken: TChilkatStringBuilder;
topicName: WideString;
subscriptionName: WideString;
messageId: WideString;
lockToken: WideString;
sbPath: TChilkatStringBuilder;
numReplaced: Integer;
sbResponseBody: TChilkatStringBuilder;

begin
// 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;

// 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());

// ----------------------------------------------------------------------------------------------
// 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..
// ----------------------------------------------------------------------------------------------

// To unlock a message, we'll need either the SequenceNumber or MessageId.
// When the message was locked, the SequenceNumber and MessageId of the locked message
// was returned in the HTTP response header named "BrokerProperties, which contained
// JSON such as the following:

// 	{
// 	  "DeliveryCount": 2,
// 	  "EnqueuedSequenceNumber": 3000003,
// 	  "EnqueuedTimeUtc": "Wed, 07 Dec 2016 17:42:48 GMT",
// 	  "Label": "M2",
// 	  "LockToken": "0a13ee8a-be32-4458-89e0-5e1401caa6a0",
// 	  "LockedUntilUtc": "Wed, 07 Dec 2016 18:13:12 GMT",
// 	  "MessageId": "7bea513a6ddb49089e07bfbee26d85bd",
// 	  "SequenceNumber": 3,
// 	  "State": "Active",
// 	  "TimeToLive": 922337203685.47754
// 	}

// The path for unlocking a message is constructed as follows, depending on
// whether it is a message on a queue or subscription:
// 
// (for a queue)
// /{queuePath}/messages/{messageId|sequenceNumber}/{lockToken}
// 
// (for a subscription)
// /{topicPath}/subscriptions/{subscriptionName}/messages/{messageId|sequenceNumber}/{lockToken}

// This example will build a path to unlock a message contained in a subscription.
topicName := 'gilaMonster';
subscriptionName := 'feedings';
messageId := '7bea513a6ddb49089e07bfbee26d85bd';
lockToken := '0a13ee8a-be32-4458-89e0-5e1401caa6a0';

// Build the path..
sbPath := TChilkatStringBuilder.Create(Self);
sbPath.Append('/{topicPath}/subscriptions/{subscriptionName}/messages/{messageId|sequenceNumber}/{lockToken}');
numReplaced := sbPath.Replace('{topicPath}',topicName);
numReplaced := sbPath.Replace('{subscriptionName}',subscriptionName);
numReplaced := sbPath.Replace('{messageId|sequenceNumber}',messageId);
numReplaced := sbPath.Replace('{lockToken}',lockToken);

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

// Use the PUT HTTP verb to unlock the message.
sbResponseBody := TChilkatStringBuilder.Create(Self);
success := rest.FullRequestNoBodySb('PUT',sbPath.GetAsString(),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 <> 200) 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 response body would be empty..
Memo1.Lines.Add('Success.');
end;