.NetCore选项数据热更新
2021/7/19 23:09:51
本文主要是介绍.NetCore选项数据热更新,对大家解决编程问题具有一定的参考价值,需要的程序猿们随着小编来一起学习吧!
1. 关键类型
- IOptionsMonitor<out TOptions>
- IOptionsSnapshot<out TOptions>
2. 场景
- 范围作用域类型(AddScoped)使用 IOptionsSnapshot
- 单例服务(AddSingleton)使用 IOptionsMonitor
3. 通过代码更新选项
- IPostConfigureOptions<TOptions>
4. IOptionsSnapshot热更新代码
public interface IOrderService { int ShowMaxCount(); } public class OrderService : IOrderService { IOptionsSnapshot<OrderServiceOptions> _options; public OrderService(IOptionsSnapshot<OrderServiceOptions> options) { this._options = options; } public int ShowMaxCount() { return _options.Value.MaxCount; } } public class OrderServiceOptions { public int MaxCount { get; set; } = 100; }
public void ConfigureServices(IServiceCollection services) { services.Configure<OrderServiceOptions>(Configuration.GetSection("OrderService")); services.AddScoped<IOrderService, OrderService>(); services.AddControllers(); services.AddSwaggerGen(c => { c.SwaggerDoc("v1", new OpenApiInfo { Title = "NET_Core", Version = "v1" }); }); }
5. IOptionsMonitor热更新代码
public interface IOrderService { int ShowMaxCount(); } public class OrderService : IOrderService { IOptionsMonitor<OrderServiceOptions> _options; public OrderService(IOptionsMonitor<OrderServiceOptions> options) { this._options = options; } public int ShowMaxCount() { return _options.CurrentValue.MaxCount; } } public class OrderServiceOptions { public int MaxCount { get; set; } = 100; }
public void ConfigureServices(IServiceCollection services) { services.Configure<OrderServiceOptions>(Configuration.GetSection("OrderService")); services.AddSingleton<IOrderService, OrderService>(); services.AddControllers(); services.AddSwaggerGen(c => { c.SwaggerDoc("v1", new OpenApiInfo { Title = "NET_Core", Version = "v1" }); }); }
6. IOptionsMonitor监听配置变化
备注1:IOptionsSnapshot不支持监听配置变化
备注2:核心代码如下,其余代码在原有基础不变
public OrderService(IOptionsMonitor<OrderServiceOptions> options) { this._options = options; _options.OnChange(option => { Console.WriteLine($"配置发生了变化:{option.MaxCount}"); }); }
7. 简化服务注册代码
把服务注册的代码,放在静态扩展方法中
namespace Microsoft.Extensions.DependencyInjection { public static class OrderServiceExtensions { public static IServiceCollection AddOrderService(this IServiceCollection services, IConfiguration configuration) { services.Configure<OrderServiceOptions>(configuration); services.AddSingleton<IOrderService, OrderService>(); return services; } } }
public void ConfigureServices(IServiceCollection services) { services.AddOrderService(Configuration.GetSection("OrderService")); services.AddControllers(); services.AddSwaggerGen(c => { c.SwaggerDoc("v1", new OpenApiInfo { Title = "NET_Core", Version = "v1" }); }); }
8. 动态配置
public static class OrderServiceExtensions { public static IServiceCollection AddOrderService(this IServiceCollection services, IConfiguration configuration) { services.Configure<OrderServiceOptions>(configuration); //从配置文件读取后,还要再给他加100 services.PostConfigure<OrderServiceOptions>(options => { options.MaxCount += 100; }); services.AddSingleton<IOrderService, OrderService>(); return services; } }
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