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ApiInterceptor.cs
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using System;
using System.Reflection;
using WebApiClient.Contexts;
namespace WebApiClient.Defaults
{
/// <summary>
/// 表示http接口调用的拦截器
/// </summary>
public class ApiInterceptor : IApiInterceptor
{
/// <summary>
/// ApiActionDescriptor缓存
/// </summary>
private static readonly ConcurrentCache<MethodInfo, ApiActionDescriptor> descriptorCache;
/// <summary>
/// 获取相关的配置
/// </summary>
public HttpApiConfig HttpApiConfig { get; private set; }
/// <summary>
/// http接口调用的拦截器
/// </summary>
static ApiInterceptor()
{
descriptorCache = new ConcurrentCache<MethodInfo, ApiActionDescriptor>();
}
/// <summary>
/// http接口调用的拦截器
/// </summary>
/// <param name="httpApiConfig">httpApi配置</param>
/// <exception cref="ArgumentNullException"></exception>
public ApiInterceptor(HttpApiConfig httpApiConfig)
{
this.HttpApiConfig = httpApiConfig ?? throw new ArgumentNullException(nameof(httpApiConfig));
}
/// <summary>
/// 拦截方法的调用
/// </summary>
/// <param name="target">接口的实例</param>
/// <param name="method">接口的方法</param>
/// <param name="parameters">接口的参数集合</param>
/// <returns></returns>
public virtual object Intercept(object target, MethodInfo method, object[] parameters)
{
var httpApi = target as IHttpApi;
var descriptor = this.GetApiActionDescriptor(method, parameters);
var apiTask = descriptor.Return.DataType.ITaskFactory.Invoke() as ApiTask;
apiTask.ContextFactory = () => this.CreateApiActionContext(httpApi, descriptor);
if (descriptor.Return.IsITaskDefinition == false)
{
return apiTask.Execute();
}
else
{
return apiTask;
}
}
/// <summary>
/// 获取api的描述
/// 默认实现使用了缓存
/// </summary>
/// <param name="method">接口的方法</param>
/// <param name="parameters">参数值集合</param>
/// <returns></returns>
protected virtual ApiActionDescriptor GetApiActionDescriptor(MethodInfo method, object[] parameters)
{
return descriptorCache.GetOrAdd(method, m => new ApiActionDescriptor(m)).Clone(parameters);
}
/// <summary>
/// 返回创建ApiActionContext新实例
/// </summary>
/// <param name="httpApi">httpApi代理类实例</param>
/// <param name="apiActionDescriptor">api的描述</param>
/// <returns></returns>
protected virtual ApiActionContext CreateApiActionContext(IHttpApi httpApi, ApiActionDescriptor apiActionDescriptor)
{
return new ApiActionContext(httpApi, this.HttpApiConfig, apiActionDescriptor);
}
/// <summary>
/// 释放资源
/// </summary>
public virtual void Dispose()
{
this.HttpApiConfig.Dispose();
}
}
}