Make IInstantJobRegistry members return the job correlation id

CHANGELOG.md

@@ -11,6 +11,10 @@ All notable changes to **NCronJob** will be documented in this file. The project
 - Expose typed version of `DisableJob()`. Added in [#151](https://github.com/NCronJob-Dev/NCronJob/issues/151), by [@nulltoken](https://github.com/nulltoken).
 - Expose typed version of `EnableJob()`. Added in [#151](https://github.com/NCronJob-Dev/NCronJob/issues/151), by [@nulltoken](https://github.com/nulltoken).
 
+### Changed
+
+- Teach `IInstantJobRegistry` members to return the job correlation id. Changed in [#153](https://github.com/NCronJob-Dev/NCronJob/issues/153), by [@nulltoken](https://github.com/nulltoken).
+
 ### Fixed
 
 - Make `RemoveJob<TJob>()` and `RemoveJob(Type)` remove all jobs of the given type. Fixed in [#151](https://github.com/NCronJob-Dev/NCronJob/issues/151), by [@nulltoken](https://github.com/nulltoken).

docs/features/instant-jobs.md

@@ -104,3 +104,15 @@ app.MapPost("/send-email", (RequestDto dto, IInstantJobRegistry jobRegistry) =>
     return TypedResults.Ok();
 });
 ```
+
+## Instrumentation
+
+All members of the `IInstantJobRegistry` interface return the correlation id of the triggered job (See [*"Tracing requests of dependencies via `CorrelationId`"*](./model-dependencies.md#tracing-requests-of-dependencies-via-correlationid).).
+
+```csharp
+Guid oneCorrelationId = jobRegistry.RunInstantJob<MyJob>();
+
+Guid anotherCorrelationId = jobRegistry.RunScheduledJob<MyJob>(TimeSpan.FromMinutes(5));
+
+[...]
+```

src/NCronJob/Registry/IInstantJobRegistry.cs

@@ -14,6 +14,7 @@
     /// <param name="parameter">An optional parameter that is passed down as the <see cref="JobExecutionContext"/> to the job.</param>
     /// <param name="token">An optional token to cancel the job.</param>
     /// </summary>
+    /// <returns>The job correlation id.</returns>
     /// <remarks>
     /// This is a fire-and-forget process, the Job will be queued with high priority and run in the background. The contents of <paramref name="parameter" />
     /// are not serialized and deserialized. It is the reference to the <paramref name="parameter"/>-object that gets passed in.
@@ -24,7 +25,7 @@
     /// instantJobRegistry.RunInstantJob&lt;MyJob&gt;(new MyParameterObject { Foo = "Bar" });
     /// </code>
     /// </example>
-    void RunInstantJob<TJob>(object? parameter = null, CancellationToken token = default)
+    Guid RunInstantJob<TJob>(object? parameter = null, CancellationToken token = default)
         where TJob : IJob;
 
     /// <summary>
@@ -36,15 +37,17 @@
     /// </remarks>
     /// <param name="jobDelegate">The delegate to execute.</param>
     /// <param name="token">An optional token to cancel the job.</param>
-    void RunInstantJob(Delegate jobDelegate, CancellationToken token = default);
+    /// <returns>The job correlation id.</returns>
+    Guid RunInstantJob(Delegate jobDelegate, CancellationToken token = default);
 
     /// <summary>
     /// Runs a job that will be executed after the given <paramref name="delay"/>.
     /// </summary>
     /// <param name="delay">The delay until the job will be executed.</param>
     /// <param name="parameter">An optional parameter that is passed down as the <see cref="JobExecutionContext"/> to the job.</param>
     /// <param name="token">An optional token to cancel the job.</param>
-    void RunScheduledJob<TJob>(TimeSpan delay, object? parameter = null, CancellationToken token = default)
+    /// <returns>The job correlation id.</returns>
+    Guid RunScheduledJob<TJob>(TimeSpan delay, object? parameter = null, CancellationToken token = default)
         where TJob : IJob;
 
     /// <summary>
@@ -53,7 +56,8 @@
     /// <param name="startDate">The starting point when the job will be executed.</param>
     /// <param name="parameter">An optional parameter that is passed down as the <see cref="JobExecutionContext"/> to the job.</param>
     /// <param name="token">An optional token to cancel the job.</param>
-    void RunScheduledJob<TJob>(DateTimeOffset startDate, object? parameter = null, CancellationToken token = default)
+    /// <returns>The job correlation id.</returns>
+    Guid RunScheduledJob<TJob>(DateTimeOffset startDate, object? parameter = null, CancellationToken token = default)
         where TJob : IJob;
 
     /// <summary>
@@ -62,47 +66,51 @@
     /// <param name="jobDelegate">The delegate to execute.</param>
     /// <param name="delay">The delay until the job will be executed.</param>
     /// <param name="token">An optional token to cancel the job.</param>
+    /// <returns>The job correlation id.</returns>
     /// <remarks>
     /// The <paramref name="jobDelegate"/> delegate supports, like <see cref="NCronJobExtensions.AddNCronJob(IServiceCollection, Delegate, string, TimeZoneInfo)"/>, that services can be retrieved dynamically.
     /// Also, the <see cref="CancellationToken"/> can be retrieved in this way.
     /// </remarks>
-    void RunScheduledJob(Delegate jobDelegate, TimeSpan delay, CancellationToken token = default);
+    Guid RunScheduledJob(Delegate jobDelegate, TimeSpan delay, CancellationToken token = default);
 
     /// <summary>
     /// Runs a job that will be executed at the given <paramref name="startDate"/>.
     /// </summary>
     /// <param name="jobDelegate">The delegate to execute.</param>
     /// <param name="startDate">The starting point when the job will be executed.</param>
     /// <param name="token">An optional token to cancel the job.</param>
+    /// <returns>The job correlation id.</returns>
     /// <remarks>
     /// The <paramref name="jobDelegate"/> delegate supports, like <see cref="NCronJobExtensions.AddNCronJob(IServiceCollection, Delegate, string, TimeZoneInfo)"/>, that services can be retrieved dynamically.
     /// Also, the <see cref="CancellationToken"/> can be retrieved in this way.
     /// </remarks>
-    void RunScheduledJob(Delegate jobDelegate, DateTimeOffset startDate, CancellationToken token = default);
+    Guid RunScheduledJob(Delegate jobDelegate, DateTimeOffset startDate, CancellationToken token = default);
 
     /// <summary>
     /// Runs a job that will be executed after the given <paramref name="delay"/>. The job will not be queued into the JobQueue, but executed directly.
     /// </summary>
     /// <param name="jobDelegate">The delegate to execute.</param>
     /// <param name="delay">The delay until the job will be executed.</param>
     /// <param name="token">An optional token to cancel the job.</param>
+    /// <returns>The job correlation id.</returns>
     /// <remarks>
     /// The <paramref name="jobDelegate"/> delegate supports, like <see cref="NCronJobExtensions.AddNCronJob(IServiceCollection, Delegate, string, TimeZoneInfo)"/>, that services can be retrieved dynamically.
     /// Also, the <see cref="CancellationToken"/> can be retrieved in this way.
     /// </remarks>
-    void ForceRunScheduledJob(Delegate jobDelegate, TimeSpan delay, CancellationToken token = default);
+    Guid ForceRunScheduledJob(Delegate jobDelegate, TimeSpan delay, CancellationToken token = default);
 
     /// <summary>
     /// Runs a job that will be executed at the given <paramref name="startDate"/>. The job will not be queued into the JobQueue, but executed directly.
     /// </summary>
     /// <param name="jobDelegate">The delegate to execute.</param>
     /// <param name="startDate">The starting point when the job will be executed.</param>
     /// <param name="token">An optional token to cancel the job.</param>
+    /// <returns>The job correlation id.</returns>
     /// <remarks>
     /// The <paramref name="jobDelegate"/> delegate supports, like <see cref="NCronJobExtensions.AddNCronJob(IServiceCollection, Delegate, string, TimeZoneInfo)"/>, that services can be retrieved dynamically.
     /// Also, the <see cref="CancellationToken"/> can be retrieved in this way.
     /// </remarks>
-    void ForceRunScheduledJob(Delegate jobDelegate, DateTimeOffset startDate, CancellationToken token = default);
+    Guid ForceRunScheduledJob(Delegate jobDelegate, DateTimeOffset startDate, CancellationToken token = default);
 
     /// <summary>
     /// Runs a job that will be executed after the given <paramref name="delay"/>. The job will not be queued into the JobQueue, but executed directly.
@@ -111,14 +119,16 @@
     /// <param name="delay">The delay until the job will be executed.</param>
     /// <param name="parameter">An optional parameter that is passed down as the <see cref="JobExecutionContext"/> to the job.</param>
     /// <param name="token">An optional token to cancel the job.</param>
-    void ForceRunScheduledJob<TJob>(TimeSpan delay, object? parameter = null, CancellationToken token = default)
+    /// <returns>The job correlation id.</returns>
+    Guid ForceRunScheduledJob<TJob>(TimeSpan delay, object? parameter = null, CancellationToken token = default)
         where TJob : IJob;
 
     /// <summary>
     /// Runs an instant job to the registry, which will be executed even if the job is not registered and the concurrency is exceeded.
     /// <param name="parameter">An optional parameter that is passed down as the <see cref="JobExecutionContext"/> to the job.</param>
     /// <param name="token">An optional token to cancel the job.</param>
     /// </summary>
+    /// <returns>The job correlation id.</returns>
     /// <remarks>
     /// This is a fire-and-forget process, the Job will be run immediately in the background. The contents of <paramref name="parameter" />
     /// are not serialized and deserialized. It is the reference to the <paramref name="parameter"/>-object that gets passed in.
@@ -129,7 +139,7 @@
     /// instantJobRegistry.RunInstantJob&lt;MyJob&gt;(new MyParameterObject { Foo = "Bar" });
     /// </code>
     /// </example>
-    void ForceRunInstantJob<TJob>(object? parameter = null, CancellationToken token = default)
+    Guid ForceRunInstantJob<TJob>(object? parameter = null, CancellationToken token = default)
         where TJob : IJob;
 
     /// <summary>
@@ -141,8 +151,8 @@
     /// </remarks>
     /// <param name="jobDelegate">The delegate to execute.</param>
     /// <param name="token">An optional token to cancel the job.</param>
-    void ForceRunInstantJob(Delegate jobDelegate, CancellationToken token = default);
-
+    /// <returns>The job correlation id.</returns>
+    Guid ForceRunInstantJob(Delegate jobDelegate, CancellationToken token = default);
 }
 
 internal sealed partial class InstantJobRegistry : IInstantJobRegistry
@@ -168,71 +178,71 @@
     }
 
     /// <inheritdoc />
-    public void RunInstantJob<TJob>(object? parameter = null, CancellationToken token = default)
+    public Guid RunInstantJob<TJob>(object? parameter = null, CancellationToken token = default)
         where TJob : IJob => RunScheduledJob<TJob>(TimeSpan.Zero, parameter, token);
 
     /// <inheritdoc />
-    public void RunInstantJob(Delegate jobDelegate, CancellationToken token = default) => RunScheduledJob(jobDelegate, TimeSpan.Zero, token);
+    public Guid RunInstantJob(Delegate jobDelegate, CancellationToken token = default) => RunScheduledJob(jobDelegate, TimeSpan.Zero, token);
 
     /// <inheritdoc />
-    public void RunScheduledJob<TJob>(TimeSpan delay, object? parameter = null, CancellationToken token = default)
+    public Guid RunScheduledJob<TJob>(TimeSpan delay, object? parameter = null, CancellationToken token = default)
         where TJob : IJob
     {
         var utcNow = timeProvider.GetUtcNow();
-        RunJob<TJob>(utcNow + delay, parameter, false, token);
+        return RunJob<TJob>(utcNow + delay, parameter, false, token);
     }
 
     /// <inheritdoc />
-    public void RunScheduledJob<TJob>(DateTimeOffset startDate, object? parameter = null, CancellationToken token = default)
+    public Guid RunScheduledJob<TJob>(DateTimeOffset startDate, object? parameter = null, CancellationToken token = default)
         where TJob : IJob =>
         RunJob<TJob>(startDate, parameter, false, token);
 
     /// <inheritdoc />
-    public void RunScheduledJob(Delegate jobDelegate, TimeSpan delay, CancellationToken token = default)
+    public Guid RunScheduledJob(Delegate jobDelegate, TimeSpan delay, CancellationToken token = default)
     {
         var utcNow = timeProvider.GetUtcNow();
-        RunScheduledJob(jobDelegate, utcNow + delay, token);
+        return RunScheduledJob(jobDelegate, utcNow + delay, token);
     }
 
     /// <inheritdoc />
-    public void RunScheduledJob(Delegate jobDelegate, DateTimeOffset startDate, CancellationToken token = default) =>
+    public Guid RunScheduledJob(Delegate jobDelegate, DateTimeOffset startDate, CancellationToken token = default) =>
         RunDelegateJob(jobDelegate, startDate, false, token);
 
     /// <inheritdoc />
-    public void ForceRunScheduledJob<TJob>(TimeSpan delay, object? parameter = null, CancellationToken token = default)
+    public Guid ForceRunScheduledJob<TJob>(TimeSpan delay, object? parameter = null, CancellationToken token = default)
         where TJob : IJob
     {
         var utcNow = timeProvider.GetUtcNow();
-        RunJob<TJob>(utcNow + delay, parameter, true, token);
+        return RunJob<TJob>(utcNow + delay, parameter, true, token);
     }
 
     /// <inheritdoc />
-    public void ForceRunScheduledJob(Delegate jobDelegate, TimeSpan delay, CancellationToken token = default)
+    public Guid ForceRunScheduledJob(Delegate jobDelegate, TimeSpan delay, CancellationToken token = default)
     {
         var utcNow = timeProvider.GetUtcNow();
-        ForceRunScheduledJob(jobDelegate, utcNow + delay, token);
+        return ForceRunScheduledJob(jobDelegate, utcNow + delay, token);
     }
 
     /// <inheritdoc />
-    public void ForceRunScheduledJob(Delegate jobDelegate, DateTimeOffset startDate, CancellationToken token = default) =>
+    public Guid ForceRunScheduledJob(Delegate jobDelegate, DateTimeOffset startDate, CancellationToken token = default) =>
         RunDelegateJob(jobDelegate, startDate, true, token);
 
     /// <inheritdoc />
-    public void ForceRunInstantJob(Delegate jobDelegate, CancellationToken token = default) =>
+    public Guid ForceRunInstantJob(Delegate jobDelegate, CancellationToken token = default) =>
         ForceRunScheduledJob(jobDelegate, TimeSpan.Zero, token);
 
     /// <inheritdoc />
-    public void ForceRunInstantJob<TJob>(object? parameter = null, CancellationToken token = default)
+    public Guid ForceRunInstantJob<TJob>(object? parameter = null, CancellationToken token = default)
         where TJob : IJob => ForceRunScheduledJob<TJob>(TimeSpan.Zero, parameter, token);
 
-    private void RunDelegateJob(Delegate jobDelegate, DateTimeOffset startDate, bool forceExecution = false, CancellationToken token = default)
+    private Guid RunDelegateJob(Delegate jobDelegate, DateTimeOffset startDate, bool forceExecution = false, CancellationToken token = default)
     {
         var definition = jobRegistry.AddDynamicJob(jobDelegate);
 
-        RunInternal(definition, null, startDate, forceExecution, token);
+        return RunInternal(definition, null, startDate, forceExecution, token);
     }
 
-    private void RunJob<TJob>(DateTimeOffset startDate, object? parameter = null, bool forceExecution = false, CancellationToken token = default)
+    private Guid RunJob<TJob>(DateTimeOffset startDate, object? parameter = null, bool forceExecution = false, CancellationToken token = default)
         where TJob : IJob
     {
         using (logger.BeginScope("Triggering RunScheduledJob:"))
@@ -247,11 +257,11 @@
 
             token.Register(() => LogCancellationRequested(parameter));
 
-            RunInternal(jobDefinition, parameter, startDate, forceExecution, token);
+            return RunInternal(jobDefinition, parameter, startDate, forceExecution, token);
         }
     }
 
-    private void RunInternal(
+    private Guid RunInternal(
         JobDefinition jobDefinition,
         object? parameter,
         DateTimeOffset startDate,
@@ -273,6 +283,8 @@
             jobQueue.EnqueueForDirectExecution(run, startDate);
             jobQueueManager.SignalJobQueue(run.JobDefinition.JobFullName);
         }
+
+        return run.CorrelationId;
     }
 
     [LoggerMessage(LogLevel.Warning, "Job {JobName} cancelled by request.")]

tests/NCronJob.Tests/RunDependentJobTests.cs

@@ -84,12 +84,13 @@ public async Task CorrelationIdIsSharedByJobsAndTheirDependencies()
         var provider = CreateServiceProvider();
         await provider.GetRequiredService<IHostedService>().StartAsync(CancellationToken);
 
-        provider.GetRequiredService<IInstantJobRegistry>().ForceRunInstantJob<PrincipalCorrelationIdJob>(token: CancellationToken);
+        var correlationId = provider.GetRequiredService<IInstantJobRegistry>().ForceRunInstantJob<PrincipalCorrelationIdJob>(token: CancellationToken);
 
         await CommunicationChannel.Reader.ReadAsync(CancellationToken);
         var storage = provider.GetRequiredService<Storage>();
         storage.Guids.Count.ShouldBe(2);
         storage.Guids.Distinct().Count().ShouldBe(1);
+        storage.Guids.First().ShouldBe(correlationId);
     }
 
     [Fact]