ABP之动态WebAPI
ABP的动态WebApi实现了直接对服务层的调用（其实病没有跨过ApiController,只是将ApiController公共化，对于这一点的处理类似于MVC，对服务端的 调用没有跨过HttpHandler一样），这样不仅减少了ApiController的开发，也更能体现驱动领域设计的层结构。
对WebApi服务的替换与路由配置
AbpWebApiModule是Abp.Web.Api的模块类，该类中定义InitializeAspNetServices，InitializeRoutes两个方法，并且在模块的Initialize方法中执行，这两个方法分别是对WebApi的服务的替换与路由的配置，。这两处对WebApi的变更才使得直接调用服务层成为可能。
View Code对服务的分析与缓存
再对服务信息的存储上，作者提供了DynamicApiControllerInfo，DynamicApiActionInfo（源码中的DynamicApiMethodInfo.cs），其中DynamicApiControllerInfo包含了一DynamicApiActionInfo集合。
View Code在执行AbpHttpControllerSelector, AbpApiControllerActionSelector, AbpControllerActivator的时候，系统已经在初始化的时候对服务层进行了分析与缓存。
在作者给的Demo SimpleTaskSystem下有一模块类SimpleTaskSystemWebApiModule
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[DependsOn(typeof(AbpWebApiModule))] //We declare depended modules explicitlypublic class SimpleTaskSystemWebApiModule : AbpModule{ public override void Initialize() { //This code is used to register classes to dependency injection system for this assembly using conventions. IocManager.RegisterAssemblyByConvention(Assembly.GetExecutingAssembly()); //Creating dynamic Web Api Controllers for application services. //Thus, 'web api layer' is created automatically by ABP. DynamicApiControllerBuilder .ForAll<IApplicationService>(Assembly.GetAssembly(typeof (SimpleTaskSystemApplicationModule)), "tasksystem") .Build(); }} |
在这里是使用到了DynamicApiControllerBuilder，这个类主要是对服务接口进行一个注册，再由IBatchApiControllerBuilder按照注册的服务接口对提供的程序集进行分析。
DynamicApiControllerBuilder提供的ForAll只是返回的一个IBatchApiControllerBuilder实现对象
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public static IBatchApiControllerBuilder<T> ForAll<T>(Assembly assembly, string servicePrefix){ return new BatchApiControllerBuilder<T>(assembly, servicePrefix);} |
这个方法为BatchApiControllerBuilder提供了服务接口与服务接口与需要分析的程序集，以及服务地址前缀。
BatchApiControllerBuilder从程序集中获取实现服务接口的非抽象类。BatchApiControllerBuilder再通过DynamicApiControllerBuilder将这些类与服务名信息传递给IApiControllerBuilder。
IApiControllerBuilder将通过服务类生成DynamicApiControllerInfo，再将IApiControllerBuilder存储于DynamicApiControllerManager中，同时分析服务类，将公开非静态方法作为action，存储到DynamicApiControllerManager.Actions
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internal class ApiControllerBuilder<T> : IApiControllerBuilder<T>{ /// <summary> /// Name of the controller. /// </summary> private readonly string _serviceName; /// <summary> /// List of all action builders for this controller. /// </summary> private readonly IDictionary<string, ApiControllerActionBuilder<T>> _actionBuilders; /// <summary> /// Action Filters to apply to the whole Dynamic Controller. /// </summary> private IFilter[] _filters; /// <summary> /// Creates a new instance of ApiControllerInfoBuilder. /// </summary> /// <param name="serviceName">Name of the controller</param> public ApiControllerBuilder(string serviceName) { if (string.IsNullOrWhiteSpace(serviceName)) { throw new ArgumentException("serviceName null or empty!", "serviceName"); } if (!DynamicApiServiceNameHelper.IsValidServiceName(serviceName)) { throw new ArgumentException("serviceName is not properly formatted! It must contain a single-depth namespace at least! For example: 'myapplication/myservice'.", "serviceName"); } _serviceName = serviceName; _actionBuilders = new Dictionary<string, ApiControllerActionBuilder<T>>(); foreach (var methodInfo in DynamicApiControllerActionHelper.GetMethodsOfType(typeof(T))) { _actionBuilders[methodInfo.Name] = new ApiControllerActionBuilder<T>(this, methodInfo); } } /// <summary> /// The adds Action filters for the whole Dynamic Controller /// </summary> /// <param name="filters"> The filters. </param> /// <returns>The current Controller Builder </returns> public IApiControllerBuilder<T> WithFilters(params IFilter[] filters) { _filters = filters; return this; } /// <summary> /// Used to specify a method definition. /// </summary> /// <param name="methodName">Name of the method in proxied type</param> /// <returns>Action builder</returns> public IApiControllerActionBuilder<T> ForMethod(string methodName) { if (!_actionBuilders.ContainsKey(methodName)) { throw new AbpException("There is no method with name " + methodName + " in type " + typeof(T).Name); } return _actionBuilders[methodName]; } /// <summary> /// Builds the controller. /// This method must be called at last of the build operation. /// </summary> public void Build() { var controllerInfo = new DynamicApiControllerInfo(_serviceName, typeof(DynamicApiController<T>), _filters); foreach (var actionBuilder in _actionBuilders.Values) { if (actionBuilder.DontCreate) { continue; } controllerInfo.Actions[actionBuilder.ActionName] = actionBuilder.BuildActionInfo(); } IocManager.Instance.IocContainer.Register( Component.For<AbpDynamicApiControllerInterceptor<T>>().LifestyleTransient(), Component.For<DynamicApiController<T>>().Proxy.AdditionalInterfaces(new[] { typeof(T) }).Interceptors<AbpDynamicApiControllerInterceptor<T>>().LifestyleTransient() ); DynamicApiControllerManager.Register(controllerInfo); LogHelper.Logger.DebugFormat("Dynamic web api controller is created for type '{0}' with service name '{1}'.", typeof(T).FullName, controllerInfo.ServiceName); }} |