Any app features that use the file's cached content are subject to possibly receiving stale content. Each request for the data renews the sliding expiration period, but the file is never reloaded into the cache. Without taking additional steps, such as the implementation described below, stale (outdated) data is returned from a cache if the source data changes.įor example, not taking into account the status of a cached source file when renewing a sliding expiration period leads to stale cached file data. In-memory caching is described in the Cache in-memory topic. When OnPostStopMonitoring is triggered, monitoring is disabled, and the state is set to reflect that monitoring isn't occurring.īuttons in the UI enable and disable monitoring.įile content can be cached in-memory using IMemor圜ache. When OnPostStartMonitoring is triggered, monitoring is enabled, and the current state is cleared. _monitor.CurrentState = "Not monitoring" Public IActionResult OnPostStopMonitoring() The configuration monitor ( _monitor) is used to enable or disable monitoring and set the current state for UI feedback: public IActionResult OnPostStartMonitoring() The instance of IConfigurationMonitor is injected into the IndexModel. The Index page offers the user control over configuration monitoring. AddJsonFile($"appsettings.") Īn instance ConfigurationMonitor is registered as a service in Startup.ConfigureServices: services.AddSingleton() This setting appears in the Host convenience method CreateDefaultBuilder: config.AddJsonFile("appsettings.json", optional: true, reloadOnChange: true) reloadOnChange indicates if configuration should be reloaded on file changes.
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These files are configured using the AddJsonFile(IConfigurationBuilder, String, Boolean, Boolean) extension method on ConfigurationBuilder that accepts a reloadOnChange parameter. Each instance returns an IChangeToken to register a change notification callback for tracking options changes.īy default, ASP.NET Core templates use JSON configuration files ( appsettings.json,, and ) to load app configuration settings.
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It's also possible for a token to never be cancelled if no changes occur or the underlying change listener is disposed or disabled. If ActiveChangedCallbacks is set to false, a callback is never called, and the app must poll HasChanged for changes. ActiveChangeCallbacks indicate if the token proactively raises callbacks.IChangeToken propagates notifications that a change has occurred.
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View or download sample code ( how to download) IChangeToken interface A change token is a general-purpose, low-level building block used to track state changes.