我们有 FeatureFlag: IsServiceNeeded,在 Azure 应用配置的功能管理器中没有设置标签。我们通过设置缓存间隔在内置方法 AddAzureAppConfiguration 中使用。
我们正在使用 .net core 3.1 web api 和 Azure 应用配置的功能管理器。
我们在应用程序初始化期间启用了 IsServiceNeeded,几个小时后,我们禁用了 IsServiceNeed。我们等了一整天,但看不出有什么区别,因为下面返回的是 true 而不是 false。由于我们在 program.cs 文件中配置它的方式,我们希望它每 3 分钟更新一次。
await _featureManager.IsEnabledAsync("IsServiceNeeded")
如果您在下面看到任何奇怪的地方,请告诉我。提前致谢,
这是我们正在使用的代码片段。
程序.cs 文件
public class Program
{
public static void Main(string[] args)
{
CreateHostBuilder(args).Build().Run();
}
public static IHostBuilder CreateHostBuilder(string[] args) =>
Host.CreateDefaultBuilder(args)
.ConfigureAppConfiguration((context, config) =>
{
var configurationRoot = config.Build();
var appConfigConString = configurationRoot["AppConfigConnectionString"];
config.AddAzureAppConfiguration(options => options.Connect(appConfigConString).UseFeatureFlags(featureFlagOptions => {
**featureFlagOptions.CacheExpirationInterval = TimeSpan.FromMinutes(3);**
}));
})
.ConfigureWebHostDefaults(webBuilder =>
{
webBuilder.UseStartup<Startup>();
});
}
启动.cs 文件
public class Startup
{
public IConfiguration Configuration { get; }
public string ContentRootPath { get; set; }
public Startup(IWebHostEnvironment env, IConfiguration configuration)
{
Configuration = configuration;
}
public void ConfigureServices(IServiceCollection services)
{
services.AddHsts(options =>
{
options.Preload = true;
options.IncludeSubDomains = true;
options.MaxAge = TimeSpan.FromDays(365);
});
var conf = Configuration.GetSection("AppSettings").Get<Config>();
services.Configure<Config>(Configuration.GetSection("AppSettings"));
services.AddSingleton<IAppSettings>(c => conf);**
services.AddScoped<IProcessHandler, ProcessHandler>();
**services.AddFeatureManagement();**
}
public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
app.UseHsts();
app.UseHttpsRedirection();
app.UseHttpStatusCodeExceptionMiddleware();
app.UseHttpsRedirection();
app.UseRouting();
app.UseAuthentication();
app.UseAuthorization();
app.UseEndpoints(endpoints =>
{
endpoints.MapControllers();
});
}
private static void LoadMediatorHandlers(IServiceCollection services)
{
foreach (var assembly in Assembly
.GetEntryAssembly()
.GetReferencedAssemblies()
.Select(Assembly.Load)
.Where(name => (name.FullName.Contains("Queries") || name.FullName.Contains("Commands"))))
{
services.AddMediatR(assembly);
}
services.AddMediatR(typeof(Startup));
services.AddScoped<IMediator, Mediator>();
}
}
特征标志的应用:
public class ProcessHandler : IProcessHandler
{
private readonly IFeatureManager _featureManager;
public ProcessHandler(IFeatureManager featureManager)
{
_featureManager = featureManager;
}
public async Task<ClassA> ProcessXyz()
{
if (`await _featureManager.IsEnabledAsync("IsServiceNeeded")`)
{
return new ClassA();
}
return null;
}
}
请注意:我刚刚添加了所需的代码并替换了实际名称以解决安全问题。
提前致谢