feat(FinishEnvelopeJob): add PDF burning with concurrency control

- Introduced PDFBurnerParams configuration for concurrency limit.
- Added SemaphoreSlim to handle concurrent PDF burning for envelopes.
- Updated job to call _mediator.BurnPdf for each envelope with error handling.
- Preserved logging of job execution and envelope UUIDs.

EnvelopeGenerator.Application/Common/Configurations/PDFBurnerParams.cs

@@ -9,6 +9,11 @@ namespace EnvelopeGenerator.Application.Common.Configurations;
 /// </summary>
 public class PDFBurnerParams : ITextStyle
 {
+    /// <summary>
+    /// 
+    /// </summary>
+    public int ConcurrencyLimit { get; set; } = 5;
+
     /// <summary>
     /// 
     /// </summary>

EnvelopeGenerator.Application/Pdf/BurnPdfCommand.cs

@@ -32,7 +32,7 @@ public static class BurnPdfCommandExtensions
     /// <param name="envelopeId"></param>
     /// <param name="cancel"></param>
     /// <returns></returns>
-    public static Task<byte[]> BurnPdf(this ISender sender, int envelopeId, CancellationToken cancel) 
+    public static Task<byte[]> BurnPdf(this ISender sender, int envelopeId, CancellationToken cancel = default) 
         => sender.Send(new BurnPdfCommand(EnvelopeId: envelopeId), cancel);
 
     /// <summary>
@@ -42,7 +42,7 @@ public static class BurnPdfCommandExtensions
     /// <param name="envelopeUuid"></param>
     /// <param name="cancel"></param>
     /// <returns></returns>
-    public static Task<byte[]> BurnPdf(this ISender sender, string envelopeUuid, CancellationToken cancel)
+    public static Task<byte[]> BurnPdf(this ISender sender, string envelopeUuid, CancellationToken cancel = default)
         => sender.Send(new BurnPdfCommand(EnvelopeUuid: envelopeUuid), cancel);
 }
 

EnvelopeGenerator.Finalizer/Job/FinishEnvelopeJob.cs

@@ -1,6 +1,7 @@
+using EnvelopeGenerator.Application.Common.Configurations;
 using EnvelopeGenerator.Application.Envelopes.Queries;
+using EnvelopeGenerator.Application.Pdf;
 using EnvelopeGenerator.Domain.Constants;
-using EnvelopeGenerator.Finalizer.Models;
 using MediatR;
 using Microsoft.Extensions.Options;
 using Quartz;
@@ -13,10 +14,13 @@ namespace EnvelopeGenerator.Finalizer.Job
 
         private readonly IMediator _mediator;
 
-        public FinishEnvelopeJob(ILogger<FinishEnvelopeJob> logger, IMediator mediator)
+        private readonly PDFBurnerParams _options;
+
+        public FinishEnvelopeJob(ILogger<FinishEnvelopeJob> logger, IMediator mediator, IOptions<PDFBurnerParams> options)
         {
             _logger = logger;
             _mediator = mediator;
+            _options = options.Value;
         }
 
         public async Task Execute(IJobExecutionContext context)
@@ -29,23 +33,39 @@ namespace EnvelopeGenerator.Finalizer.Job
                 HasDocResult = false
             }, cancel);
 
-            foreach (var envelope in envelopes) 
+            using var semaphore = new SemaphoreSlim(_options.ConcurrencyLimit);
+            await Task.WhenAll(envelopes.Select(async envelope =>
             {
-                // add sub-steps
-            }
+                await semaphore.WaitAsync(cancel);
+                try
+                {
+                    await _mediator.BurnPdf(envelope.Id, cancel);
+                }
+                catch (Exception ex)
+                {
+                    _logger.LogError(ex, "Error burning envelope {EnvelopeId}", envelope.Id);
+                }
+                finally
+                {
+                    semaphore.Release();
+                }
+            }));
 
-            if (envelopes.Any())
+            var envelopeCount = envelopes.Count();
+            if (envelopeCount > 0)
+            {
                 _logger.LogInformation(
                     "Job '{JobName}' executed at {Timestamp}. {EnvelopeCount} envelope(s) successfully finalized. UUID(s): {EnvelopeUuids}",
                     context.JobDetail.Key.Name,
-                    DateTimeOffset.Now,
-                    envelopes.Count(),
+                    context.FireTimeUtc.ToLocalTime(),
+                    envelopeCount,
                     string.Join(", ", envelopes.Select(e => e.Uuid))
                 );
+            }
             else
                 _logger.LogInformation("Job '{JobName}' executed successfully at {Timestamp}. No envelopes were finalized.",
                     context.JobDetail.Key.Name,
-                    DateTimeOffset.Now
+                    context.FireTimeUtc.ToLocalTime()
                 );
         }
     }