![]() ![]() So what I am going to do is when a job picks up a queue item it will add a comment indicating which job is doing it. Queue items have got two areas we can manipulate during execution that can hold information useful for tracing, the progress status and comments. Instead, this is how I am going to tackle it. I’m not very keen on the idea of diving into the database, especially if you need to use a third party tool to do so and connect up all of this information. Alternatively, select Ctrl + C from the console window to signal cancellation.This is an excellent question and one I have been considering as I am working on using the various persistence activities and its also relevant there, especially when using the wait for queue item activity. If running the application from within Visual Studio, select Debug > Stop Debugging. Tap W to add a work item to the background queue.Īpplication started. When prompted enter the w (or W) at least once to queue an emulated work item, as shown in the example output: info: NET CLI, run the dotnet run command from the working directory: dotnet runįor more information on the. To run the application from Visual Studio, select F5 or select the Debug > Start Debugging menu option. MonitorLoop monitorLoop = ()! įor more information on registering services, see Dependency injection in. Replace the existing Program contents with the following C# code: Protected override Task ExecuteAsync(CancellationToken stoppingToken) (_taskQueue, _logger) = (taskQueue, logger) Private readonly IBackgroundTaskQueue _taskQueue Public sealed class QueuedHostedService : BackgroundService Replace the existing Worker class with the following C# code, and rename the file to QueueHostedService.cs. Work items are awaited before the service stops in StopAsync.Background tasks in the queue are dequeued and executed in ProcessTaskQueueAsync.The ProcessTaskQueueAsync method returns a Task in ExecuteAsync. ![]() In the following QueueHostedService example: Which leads to backpressure, in case too many publishers/calls start accumulating. BoundedChannelFullMode.Wait causes calls to ChannelWriter.WriteAsync to return a task, which completes only when space becomes available. Capacity should be set based on the expected application load and number of concurrent threads accessing the queue. ![]() The BoundedChannelOptions(Int32) is called with an explicit capacity. The preceding implementation relies on a Channel as a queue. Throw new ArgumentNullException(nameof(workItem)) Īwait _(workItem) Īwait _(cancellationToken) Public async ValueTask QueueBackgroundWorkItemAsync( _queue = Channel.CreateBounded>(options) Public DefaultBackgroundTaskQueue(int capacity)īoundedChannelOptions options = new(capacity) Public sealed class DefaultBackgroundTaskQueue : IBackgroundTaskQueue ![]()
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