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ABP在与页面交互中最。它让我们可以直接可以调用服务层(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。
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。
private static void InitializeAspNetServices() { GlobalConfiguration.Configuration.Services.Replace(typeof(IHttpControllerSelector), new AbpHttpControllerSelector(GlobalConfiguration.Configuration)); GlobalConfiguration.Configuration.Services.Replace(typeof(IHttpActionSelector), new AbpApiControllerActionSelector()); GlobalConfiguration.Configuration.Services.Replace(typeof(IHttpControllerActivator), new AbpControllerActivator()); } private static void InitializeRoutes() { DynamicApiRouteConfig.Register(); } public static void Register() { //Dynamic Web APIs (with area name) GlobalConfiguration.Configuration.Routes.MapHttpRoute( name: "AbpDynamicWebApi", routeTemplate: "api/services/{*serviceNameWithAction}" ); }
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。
internal class DynamicApiControllerInfo { /// <summary> /// Name of the service. /// </summary> public string ServiceName { get; private set; } /// <summary> /// Controller type. /// </summary> public Type Type { get; private set; } /// <summary> /// Dynamic Action Filters for this controller. /// </summary> public IFilter[] Filters { get; set; } /// <summary> /// All actions of the controller. /// </summary> public IDictionary<string, DynamicApiActionInfo> Actions { get; private set; } /// <summary> /// Creates a new <see cref="DynamicApiControllerInfo"/> instance. /// </summary> /// <param name="serviceName">Name of the service</param> /// <param name="type">Controller type</param> /// <param name="filters">Filters</param> public DynamicApiControllerInfo(string serviceName, Type type, IFilter[] filters = null) { ServiceName = serviceName; Type = type; Filters = filters ?? new IFilter[] { }; //Assigning or initialzing the action filters. Actions = new Dictionary<string, DynamicApiActionInfo>(StringComparer.InvariantCultureIgnoreCase); } }
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
    [DependsOn(typeof(AbpWebApiModule))] //We declare depended modules explicitly
    public 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
        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。
        public void Build()
        {
            var types =
                from
                    type in _assembly.GetTypes()
                where
                    type.IsPublic && type.IsInterface && typeof(T).IsAssignableFrom(type) && IocManager.Instance.IsRegistered(type)
                select
                    type;
            if (_typePredicate != null)
            {
                types = types.Where(t => _typePredicate(t));
            }
            foreach (var type in types)
            {
                var serviceName = _serviceNameSelector != null
                    ? _serviceNameSelector(type)
                    : GetConventionalServiceName(type);
                if (!string.IsNullOrWhiteSpace(_servicePrefix))
                {
                    serviceName = _servicePrefix + "/" + serviceName;
                }
                var builder = typeof(DynamicApiControllerBuilder)
                    .GetMethod("For", BindingFlags.Public | BindingFlags.Static)
                    .MakeGenericMethod(type)
                    .Invoke(null, new object[] { serviceName });
                if (_filters != null)
                {
                    builder.GetType()
                        .GetMethod("WithFilters", BindingFlags.Public | BindingFlags.Instance)
                        .Invoke(builder, new object[] { _filters });
                }
                builder.GetType()
                        .GetMethod("Build", BindingFlags.Public | BindingFlags.Instance)
                        .Invoke(builder, new object[0]);
            }
        }
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
    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);
        }
    }
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原文地址:http://www.cnblogs.com/gangtianci/p/4691043.html