Initial commit (history squashed)

src/StellaOps.Feedser.Core/Jobs/JobSchedulerBuilder.cs

@@ -0,0 +1,47 @@
+using System;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace StellaOps.Feedser.Core.Jobs;
+
+public sealed class JobSchedulerBuilder
+{
+    private readonly IServiceCollection _services;
+
+    public JobSchedulerBuilder(IServiceCollection services)
+    {
+        _services = services ?? throw new ArgumentNullException(nameof(services));
+    }
+
+    public JobSchedulerBuilder AddJob<TJob>(
+        string kind,
+        string? cronExpression = null,
+        TimeSpan? timeout = null,
+        TimeSpan? leaseDuration = null,
+        bool enabled = true)
+        where TJob : class, IJob
+    {
+        ArgumentException.ThrowIfNullOrEmpty(kind);
+
+        _services.AddTransient<TJob>();
+        _services.Configure<JobSchedulerOptions>(options =>
+        {
+            if (options.Definitions.ContainsKey(kind))
+            {
+                throw new InvalidOperationException($"Job '{kind}' is already registered.");
+            }
+
+            var resolvedTimeout = timeout ?? options.DefaultTimeout;
+            var resolvedLease = leaseDuration ?? options.DefaultLeaseDuration;
+
+            options.Definitions.Add(kind, new JobDefinition(
+                kind,
+                typeof(TJob),
+                resolvedTimeout,
+                resolvedLease,
+                cronExpression,
+                enabled));
+        });
+
+        return this;
+    }
+}