{"id":23459552,"url":"https://github.com/d-led/persistent_observable_experiment","last_synced_at":"2026-03-17T18:42:32.258Z","repository":{"id":10874905,"uuid":"67253429","full_name":"d-led/persistent_observable_experiment","owner":"d-led","description":"Durable queues as IObservables experiment for 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Durable queues as IObservables experiment for fun\n\n[![Build status](https://ci.appveyor.com/api/projects/status/l82q9ukingqcb4j9/branch/master?svg=true)](https://ci.appveyor.com/project/d-led/persistent-observable-experiment/branch/master)\n\n## Queue to IObservable\n\n```c#\n// create a queue\nusing (var queue = new PersistentQueueWrapper\u003cWorkItem\u003e(\"q1\")) {\n  queue.Enqueue(new WorkItem { WorkId = DateTime.Now.ToFileTimeUtc() });\n}\n// and lose it\n\n// reopen the durable queue\nusing (var queue = new PersistentQueueWrapper\u003cWorkItem\u003e(\"q1\")) {\n // enqueue\n queue.Enqueue(new WorkItem { WorkId = DateTime.Now.ToFileTimeUtc() });\n\n // dequeue until timed out\n queue\n    .ToObservableItems(\n        sleep_for: TimeSpan.FromSeconds(0.3),\n        max_wait: TimeSpan.FromSeconds(1)\n    )\n    .Subscribe(\n        x =\u003e Console.WriteLine($\"{x.WorkId}\"),\n        e =\u003e Console.Error.WriteLine(e),\n        () =\u003e Console.WriteLine(\"No more items\")\n    );\n}\n```\n\n\u0026darr;\n\n```text\n131473231919577487\n131473231921304305\nNo more items\n```\n\n## Making IObservable durable\n\n```c#\n// post some items\nusing (var queue = new PersistentQueueWrapper\u003cWorkItem\u003e(\"q1\"))\n{\n  Observable\n    .Range(0, 2)\n    .Select(_ =\u003e NewWorkItem())\n    .Persistent(queue, TimeSpan.FromMilliseconds(0));\n}\n\n// post some more items and observe the previously enqueued ones\nusing (var queue = new PersistentQueueWrapper\u003cWorkItem\u003e(\"q1\"))\n{\n  Observable\n    .Interval(TimeSpan.FromSeconds(1))\n    .Take(3)\n    .Select(_ =\u003e NewWorkItem())\n    .Persistent(queue, TimeSpan.FromMilliseconds(100))\n    .Subscribe(item =\u003e Console.WriteLine(item.WorkId))\n  ;\n}\n```\n\n## Using\n\n* [DiskQueue](https://github.com/i-e-b/DiskQueue) for persistent queue\n* [Newtonsoft.Json](https://github.com/JamesNK/Newtonsoft.Json) for serialization\n\nlater, using [sharpqueue](https://github.com/sharptools/sharpqueue)\n\n## Ideas\n\n* Hide the queue lifetime from the observables\n* Use another queue as example\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fd-led%2Fpersistent_observable_experiment","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fd-led%2Fpersistent_observable_experiment","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fd-led%2Fpersistent_observable_experiment/lists"}