Message Queues for Delphi

Stop blocking the main thread

When a Delphi application handles everything synchronously, slow operations block the UI. Processing orders, generating reports, sending notifications in the main thread: if the application crashes mid-operation, the work is lost.

Amazon SQS gives you managed message queues. With the AWS SDK for Delphi, you push messages onto a queue and process them later, from the same application or a different one. Messages persist until they’re handled, so nothing gets lost.

Example

Send a message and poll for results:

uses
  AWS.SQS;

var
  SQS: ISQSClient;
  QueuePoller: ISQSQueuePoller;
begin
  SQS := TSQSClient.Create;

  // Send a message
  SQS.SendMessage(QueueURL, 'Order #1234 received');

  // Poll for messages
  QueuePoller := TSQSQueuePoller.Create(QueueURL);
  QueuePoller.Poll(
    procedure(const AMessages: TSQSMessages)
    begin
      for var Msg in AMessages do
        ProcessOrder(Msg.Body);
    end
  );
end;
      

Good for

• Order processing and fulfilment workflows
• Background report generation
• Distributing work across multiple machines