Add BackgroundScheduleServiceBase<T>

Directory.Build.props

@@ -43,10 +43,10 @@
   <ItemGroup Label="Code Analyzers">
     <PackageReference Include="AsyncFixer" Version="1.6.0" PrivateAssets="All" />
     <PackageReference Include="Asyncify" Version="0.9.7" PrivateAssets="All" />
-    <PackageReference Include="Meziantou.Analyzer" Version="2.0.146" PrivateAssets="All" />
+    <PackageReference Include="Meziantou.Analyzer" Version="2.0.161" PrivateAssets="All" />
     <PackageReference Include="SecurityCodeScan.VS2019" Version="5.6.7" PrivateAssets="All" />
     <PackageReference Include="StyleCop.Analyzers" Version="1.2.0-beta.435" PrivateAssets="All" />
-    <PackageReference Include="SonarAnalyzer.CSharp" Version="9.23.1.88495" PrivateAssets="All" />
+    <PackageReference Include="SonarAnalyzer.CSharp" Version="9.29.0.95321" PrivateAssets="All" />
   </ItemGroup>
 
 </Project>

README.md

@@ -32,7 +32,39 @@ The Atc.Hosting namespace serves as a toolbox for building scalable and reliable
 
 # BackgroundServiceBase`<T>`
 
-The `BackgroundServiceBase<T>` class serves as a base for continuous long running background services that require enhanced features like custom logging and configurable service options. It extends the ASP.NET Core's `BackgroundService` class, providing a more robust framework for handling background tasks.
+The `BackgroundServiceBase<T>` class serves as a base for continuous long running background services that require enhanced features like custom logging and configurable service options.
+It extends the ASP.NET Core's `BackgroundService` class, providing a more robust framework for handling background tasks.
+
+This class is based on repeat intervals.
+
+# BackgroundScheduleServiceBase`<T>`
+
+The `BackgroundScheduleServiceBase<T>` class serves as a base for continuous long running background services that require enhanced features like custom logging and configurable service options.
+It extends the ASP.NET Core's `BackgroundService` class, providing a more robust framework for handling background tasks.
+
+This class is based on cron expression for scheduling.
+
+- More information about cron expressions can be found on [wiki](https://en.wikipedia.org/wiki/Cron)
+- To get help with defining a cron expression, use this [cron online helper](https://crontab.cronhub.io/)
+
+## Cron format
+
+Cron expression is a mask to define fixed times, dates and intervals. 
+The mask consists of second (optional), minute, hour, day-of-month, month and day-of-week fields.
+All of the fields allow you to specify multiple values, and any given date/time will satisfy the specified Cron expression, if all the fields contain a matching value.
+
+```
+                                       Allowed values    Allowed special characters   Comment
+
+┌───────────── second (optional)       0-59              * , - /                      
+│ ┌───────────── minute                0-59              * , - /                      
+│ │ ┌───────────── hour                0-23              * , - /                      
+│ │ │ ┌───────────── day of month      1-31              * , - / L W ?                
+│ │ │ │ ┌───────────── month           1-12 or JAN-DEC   * , - /                      
+│ │ │ │ │ ┌───────────── day of week   0-6  or SUN-SAT   * , - / # L ?                Both 0 and 7 means SUN
+│ │ │ │ │ │
+* * * * * *
+```
 
 ## Features
 
@@ -44,14 +76,15 @@ The `BackgroundServiceBase<T>` class serves as a base for continuous long runnin
 ### Error Handling
 
 - Catches unhandled exceptions and logs them with a severity of `LogLevel.Warning`.
-- Reruns the `DoWorkAsync` method after a configurable repeat interval.
+- Reruns the `DoWorkAsync` method after a configurable `repeat interval` for `BackgroundServiceBase` or `scheduled` for `BackgroundScheduleServiceBase`.
 - For manual error handling hook into the exception handling in `DoWorkAsync` by overriding the `OnExceptionAsync` method.
 - Designed to log errors rather than crashing the service.
 
 ### Configuration Options
 
-- Allows for startup delays.
-- Configurable repeat interval for running tasks.
+- Allows for `startup delays` for `BackgroundServiceBase`.
+- Configurable `repeat interval` for running tasks with `BackgroundServiceBase`.
+- Configurable `cron expression` for scheduling running tasks with `BackgroundScheduleServiceBase`.
 
 ### Ease of Use
 
@@ -74,6 +107,21 @@ public class MyBackgroundService : BackgroundServiceBase<MyBackgroundService>
 }
 ```
 
+```csharp
+public class MyBackgroundService : BackgroundScheduleServiceBase<MyBackgroundService>
+{
+    public MyBackgroundService(ILogger<MyBackgroundService> logger, IBackgroundScheduleServiceOptions options)
+        : base(logger, options)
+    {
+    }
+
+    public override Task DoWorkAsync(CancellationToken stoppingToken)
+    {
+        // Your background task logic here
+    }
+}
+```
+
 ## Setup BackgroundService via Dependency Injection
 
 ```csharp
@@ -92,13 +140,38 @@ var host = Host
     })
     .Build();
 
-host.Run();
+await host.RunAsync();
 ```
 
 In this example the `TimeFileWorker` BackgroundService is wired up by using `AddHostedService<T>` as a normal `BackgroundService`.
 
 Note: `TimeFileWorker` uses `TimeFileWorkerOptions` that implements `IBackgroundServiceOptions`.
 
+## Setup BackgroundScheduleServiceBase via Dependency Injection
+
+```csharp
+var configuration = new ConfigurationBuilder()
+    .SetBasePath(Directory.GetCurrentDirectory())
+    .AddJsonFile("appsettings.json", optional: false, reloadOnChange: true)
+    .Build();
+
+var host = Host
+    .CreateDefaultBuilder(args)
+    .ConfigureServices(services =>
+    {
+        services.AddSingleton<ITimeService, TimeService>();
+        services.Configure<TimeFileScheduleWorkerOptions>(configuration.GetSection(TimeFileScheduleWorkerOptions.SectionName));
+        services.AddHostedService<TimeFileScheduleWorker>();
+    })
+    .Build();
+
+await host.RunAsync();
+```
+
+In this example the `TimeFileScheduleWorker` BackgroundService is wired up by using `AddHostedService<T>` as a normal `BackgroundService`.
+
+Note: `TimeFileScheduleWorker` uses `TimeFileScheduleWorkerOptions` that implements `IBackgroundScheduleServiceOptions`.
+
 # BackgroundServiceHealthService
 
 `IBackgroundServiceHealthService` is an interface that provides methods to manage and monitor the health of background services in a .NET application.
@@ -245,9 +318,84 @@ public class TimeFileWorker : BackgroundServiceBase<TimeFileWorker>
 
         var outFile = Path.Combine(
             workerOptions.OutputDirectory,
-            $"{time:yyyy-MM-dd--HHmmss}-{isServiceRunning}.txt");
+            $"{nameof(TimeFileWorker)}.txt");
+
+        return File.AppendAllLinesAsync(
+            outFile,
+            contents: [$"{time:yyyy-MM-dd HH:mm:ss} - {ServiceName} - IsRunning={isServiceRunning}"],
+            stoppingToken);
+    }
+
+    protected override Task OnExceptionAsync(
+        Exception exception,
+        CancellationToken stoppingToken)
+    {
+        if (exception is IOException or UnauthorizedAccessException)
+        {
+            logger.LogCritical(exception, "Could not write file!");
+            return StopAsync(stoppingToken);
+        }
+
+        return base.OnExceptionAsync(exception, stoppingToken);
+    }
+}
+```
+
+# Complete TimeFileScheduleWorker example
+
+A sample reference implementation can be found in the sample project [`Atc.Hosting.TimeFile.Sample`](sample/Atc.Hosting.TimeFile.Sample/Program.cs)
+which shows an example of the service `TimeFileScheduleWorker` that uses `BackgroundScheduleServiceBase` and the `IBackgroundServiceHealthService`.
+
+```csharp
+public class TimeFileScheduleWorker : BackgroundScheduleServiceBase<TimeFileScheduleWorker>
+{
+    private readonly ITimeProvider timeProvider;
+
+    private readonly TimeFileScheduleWorkerOptions workerOptions;
+
+    public TimeFileWorker(
+        ILogger<TimeFileScheduleWorker> logger,
+        IBackgroundServiceHealthService healthService,
+        ITimeProvider timeProvider,
+        IOptions<TimeFileScheduleWorkerOptions> workerOptions)
+        : base(
+            logger,
+            workerOptions.Value,
+            healthService)
+    {
+        this.timeProvider = timeProvider;
+        this.workerOptions = workerOptions.Value;
+    }
+
+    public override Task StartAsync(
+        CancellationToken cancellationToken)
+    {
+        return base.StartAsync(cancellationToken);
+    }
+
+    public override Task StopAsync(
+        CancellationToken cancellationToken)
+    {
+        return base.StopAsync(cancellationToken);
+    }
+
+    public override Task DoWorkAsync(
+        CancellationToken stoppingToken)
+    {
+        var isServiceRunning = healthService.IsServiceRunning(nameof(TimeFileWorker));
+
+        Directory.CreateDirectory(workerOptions.OutputDirectory);
+
+        var time = timeProvider.UtcNow;
+
+        var outFile = Path.Combine(
+            workerOptions.OutputDirectory,
+            $"{nameof(TimeFileScheduleWorker)}.txt");
 
-        return File.WriteAllTextAsync(outFile, $"{ServiceName}-{isServiceRunning}", stoppingToken);
+        return File.AppendAllLinesAsync(
+            outFile,
+            contents: [$"{time:yyyy-MM-dd HH:mm:ss} - {ServiceName} - IsRunning={isServiceRunning}"],
+            stoppingToken);
     }
 
     protected override Task OnExceptionAsync(

sample/Atc.Hosting.TimeFile.Sample/Program.cs

@@ -9,9 +9,13 @@
     .ConfigureServices(services =>
     {
         services.AddSingleton<ITimeProvider, SystemTimeProvider>();
+
         services.Configure<TimeFileWorkerOptions>(configuration.GetSection(TimeFileWorkerOptions.SectionName));
         services.AddHostedService<TimeFileWorker>();
 
+        services.Configure<TimeFileScheduleWorkerOptions>(configuration.GetSection(TimeFileScheduleWorkerOptions.SectionName));
+        services.AddHostedService<TimeFileScheduleWorker>();
+
         services.AddSingleton<IBackgroundServiceHealthService, BackgroundServiceHealthService>(s =>
         {
             var healthService = new BackgroundServiceHealthService(s.GetRequiredService<ITimeProvider>());
@@ -24,4 +28,4 @@
     })
     .Build();
 
-host.Run();
+await host.RunAsync();

sample/Atc.Hosting.TimeFile.Sample/TimeFileScheduleWorker.cs

@@ -0,0 +1,66 @@
+namespace Atc.Hosting.TimeFile.Sample;
+
+public class TimeFileScheduleWorker : BackgroundScheduleServiceBase<TimeFileScheduleWorker>
+{
+    private readonly ITimeProvider timeProvider;
+
+    private readonly TimeFileScheduleWorkerOptions workerOptions;
+
+    public TimeFileScheduleWorker(
+        ILogger<TimeFileScheduleWorker> logger,
+        IBackgroundServiceHealthService healthService,
+        ITimeProvider timeProvider,
+        IOptions<TimeFileScheduleWorkerOptions> workerOptions)
+        : base(
+            logger,
+            workerOptions.Value,
+            healthService)
+    {
+        this.timeProvider = timeProvider;
+        this.workerOptions = workerOptions.Value;
+    }
+
+    public override Task StartAsync(
+        CancellationToken cancellationToken)
+    {
+        return base.StartAsync(cancellationToken);
+    }
+
+    public override Task StopAsync(
+        CancellationToken cancellationToken)
+    {
+        return base.StopAsync(cancellationToken);
+    }
+
+    public override Task DoWorkAsync(
+        CancellationToken stoppingToken)
+    {
+        var isServiceRunning = healthService.IsServiceRunning(nameof(TimeFileWorker));
+
+        Directory.CreateDirectory(workerOptions.OutputDirectory);
+
+        var time = timeProvider.UtcNow;
+
+        var outFile = Path.Combine(
+            workerOptions.OutputDirectory,
+            $"{nameof(TimeFileWorker)}.txt");
+
+        return File.AppendAllLinesAsync(
+            outFile,
+            [$"{time:yyyy-MM-dd HH:mm:ss} - {ServiceName} - IsRunning={isServiceRunning}"],
+            stoppingToken);
+    }
+
+    protected override Task OnExceptionAsync(
+        Exception exception,
+        CancellationToken stoppingToken)
+    {
+        if (exception is IOException or UnauthorizedAccessException)
+        {
+            logger.LogCritical(exception, "Could not write file!");
+            return StopAsync(stoppingToken);
+        }
+
+        return base.OnExceptionAsync(exception, stoppingToken);
+    }
+}

sample/Atc.Hosting.TimeFile.Sample/TimeFileScheduleWorkerOptions.cs

@@ -0,0 +1,13 @@
+namespace Atc.Hosting.TimeFile.Sample;
+
+public class TimeFileScheduleWorkerOptions : IBackgroundScheduleServiceOptions
+{
+    public const string SectionName = "TimeFileScheduleWorker";
+
+    public string OutputDirectory { get; set; } = Path.GetTempPath();
+
+    public string CronExpression { get; set; } = "*/5 * * * *";
+
+    public override string ToString()
+        => $"{nameof(OutputDirectory)}: {OutputDirectory}, {nameof(CronExpression)}: {CronExpression}";
+}

sample/Atc.Hosting.TimeFile.Sample/TimeFileWorker.cs

@@ -43,9 +43,12 @@ public override Task DoWorkAsync(
 
         var outFile = Path.Combine(
             workerOptions.OutputDirectory,
-            $"{time:yyyy-MM-dd--HHmmss}-{isServiceRunning}.txt");
+            $"{nameof(TimeFileWorker)}.txt");
 
-        return File.WriteAllTextAsync(outFile, $"{ServiceName}-{isServiceRunning}", stoppingToken);
+        return File.AppendAllLinesAsync(
+            outFile,
+            [$"{time:yyyy-MM-dd HH:mm:ss} - {ServiceName} - IsRunning={isServiceRunning}"],
+            stoppingToken);
     }
 
     protected override Task OnExceptionAsync(

sample/Atc.Hosting.TimeFile.Sample/appsettings.json

@@ -1,8 +1,12 @@
 {
   "TimeFileWorker": {
-    "OutputDirectory": "C:\\Temp\\TimeFileWorkerService",
+    "OutputDirectory": "C:\\Temp\\TimeFileWorkerTesting",
     "StartupDelaySeconds": 1,
-    "RetryCount": 3,
+    "RepeatIntervalSeconds": 10
+  },
+  "TimeFileScheduleWorker": {
+    "OutputDirectory": "C:\\Temp\\TimeFileWorkerTesting",
+    "CronExpression": " */1 * * * *",
     "RepeatIntervalSeconds": 10
   }
 }

src/Atc.Hosting/Atc.Hosting.csproj

@@ -14,9 +14,14 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Atc" Version="2.0.465" />
+    <PackageReference Include="Atc" Version="2.0.495" />
+    <PackageReference Include="Cronos" Version="0.8.4" />
     <PackageReference Include="Microsoft.Extensions.Hosting.Abstractions" Version="8.0.0" />
     <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="8.0.1" />
   </ItemGroup>
 
+  <ItemGroup>
+    <PackageReference Update="Nerdbank.GitVersioning" Version="3.6.139" />
+  </ItemGroup>
+
 </Project>